From 60b30c036397cb5627fa374bb930794b225daa29 Mon Sep 17 00:00:00 2001 From: Jack Humbert Date: Fri, 7 Jul 2017 11:55:23 -0400 Subject: Squashed 'lib/lufa/' content from commit 385d40300 git-subtree-dir: lib/lufa git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b --- LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h | 251 ++++++++++++++++++++ LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h | 212 +++++++++++++++++ LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.c | 126 ++++++++++ LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h | 289 +++++++++++++++++++++++ LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c | 185 +++++++++++++++ LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h | 302 ++++++++++++++++++++++++ 6 files changed, 1365 insertions(+) create mode 100644 LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h create mode 100644 LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h create mode 100644 LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.c create mode 100644 LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h create mode 100644 LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c create mode 100644 LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h (limited to 'LUFA/Drivers/Peripheral/XMEGA') diff --git a/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h new file mode 100644 index 0000000000..7797df11a9 --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h @@ -0,0 +1,251 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief SPI Peripheral Driver (XMEGA) + * + * On-chip SPI driver for the XMEGA microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI driver + * dispatch header located in LUFA/Drivers/Peripheral/SPI.h. + */ + +/** \ingroup Group_SPI + * \defgroup Group_SPI_XMEGA SPI Peripheral Driver (XMEGA) + * + * \section Sec_SPI_XMEGA_ModDescription Module Description + * Driver for the hardware SPI port(s) available on XMEGA AVR microcontroller models. This + * module provides an easy to use driver for the setup and transfer of data over the AVR's + * SPI ports. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI driver + * dispatch header located in LUFA/Drivers/Peripheral/SPI.h. + * + * \code + * // Initialize the SPI driver before first use + * SPI_Init(&SPIC, + * SPI_SPEED_FCPU_DIV_2 | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_FALLING | + * SPI_SAMPLE_TRAILING | SPI_MODE_MASTER); + * + * // Send several bytes, ignoring the returned data + * SPI_SendByte(&SPIC, 0x01); + * SPI_SendByte(&SPIC, 0x02); + * SPI_SendByte(&SPIC, 0x03); + * + * // Receive several bytes, sending a dummy 0x00 byte each time + * uint8_t Byte1 = SPI_ReceiveByte(&SPIC); + * uint8_t Byte2 = SPI_ReceiveByte(&SPIC); + * uint8_t Byte3 = SPI_ReceiveByte(&SPIC); + * + * // Send a byte, and store the received byte from the same transaction + * uint8_t ResponseByte = SPI_TransferByte(&SPIC, 0xDC); + * \endcode + * + * @{ + */ + +#ifndef __SPI_XMEGA_H__ +#define __SPI_XMEGA_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SPI_H) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/SPI.h instead. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* Macros: */ + #define SPI_USE_DOUBLESPEED SPI_CLK2X_bm + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name SPI Prescaler Configuration Masks */ + //@{ + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 2. */ + #define SPI_SPEED_FCPU_DIV_2 SPI_USE_DOUBLESPEED + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 4. */ + #define SPI_SPEED_FCPU_DIV_4 0 + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 8. */ + #define SPI_SPEED_FCPU_DIV_8 (SPI_USE_DOUBLESPEED | (1 << SPI_PRESCALER_gp)) + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 16. */ + #define SPI_SPEED_FCPU_DIV_16 (1 << SPI_PRESCALER_gp) + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 32. */ + #define SPI_SPEED_FCPU_DIV_32 (SPI_USE_DOUBLESPEED | (2 << SPI_PRESCALER_gp)) + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 64. */ + #define SPI_SPEED_FCPU_DIV_64 (2 << SPI_PRESCALER_gp) + + /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 128. */ + #define SPI_SPEED_FCPU_DIV_128 (3 << SPI_PRESCALER_gp) + //@} + + /** \name SPI SCK Polarity Configuration Masks */ + //@{ + /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the rising edge. */ + #define SPI_SCK_LEAD_RISING 0 + + /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the falling edge. */ + #define SPI_SCK_LEAD_FALLING SPI_MODE1_bm + //@} + + /** \name SPI Sample Edge Configuration Masks */ + //@{ + /** SPI data sample mode mask for \ref SPI_Init(). Indicates that the data should sampled on the leading edge. */ + #define SPI_SAMPLE_LEADING 0 + + /** SPI data sample mode mask for \ref SPI_Init(). Indicates that the data should be sampled on the trailing edge. */ + #define SPI_SAMPLE_TRAILING SPI_MODE0_bm + //@} + + /** \name SPI Data Ordering Configuration Masks */ + //@{ + /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out MSB first. */ + #define SPI_ORDER_MSB_FIRST 0 + + /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out LSB first. */ + #define SPI_ORDER_LSB_FIRST SPI_DORD_bm + //@} + + /** \name SPI Mode Configuration Masks */ + //@{ + /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */ + #define SPI_MODE_SLAVE 0 + + /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */ + #define SPI_MODE_MASTER SPI_MASTER_bm + //@} + + /* Inline Functions: */ + /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other + * SPI routines. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + * \param[in] SPIOptions SPI Options, a mask consisting of one of each of the \c SPI_SPEED_*, + * \c SPI_SCK_*, \c SPI_SAMPLE_*, \c SPI_ORDER_* and \c SPI_MODE_* masks. + */ + static inline void SPI_Init(SPI_t* const SPI, + const uint8_t SPIOptions) ATTR_NON_NULL_PTR_ARG(1); + static inline void SPI_Init(SPI_t* const SPI, + const uint8_t SPIOptions) + { + SPI->CTRL = (SPIOptions | SPI_ENABLE_bm); + } + + /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + */ + static inline void SPI_Disable(SPI_t* const SPI) ATTR_NON_NULL_PTR_ARG(1); + static inline void SPI_Disable(SPI_t* const SPI) + { + SPI->CTRL &= ~SPI_ENABLE_bm; + } + + /** Retrieves the currently selected SPI mode, once the SPI interface has been configured. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + * + * \return \ref SPI_MODE_MASTER if the interface is currently in SPI Master mode, \ref SPI_MODE_SLAVE otherwise + */ + static inline uint8_t SPI_GetCurrentMode(SPI_t* const SPI) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SPI_GetCurrentMode(SPI_t* const SPI) + { + return (SPI->CTRL & SPI_MASTER_bm); + } + + /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + * \param[in] Byte Byte to send through the SPI interface. + * + * \return Response byte from the attached SPI device. + */ + static inline uint8_t SPI_TransferByte(SPI_t* const SPI, + const uint8_t Byte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SPI_TransferByte(SPI_t* const SPI, + const uint8_t Byte) + { + SPI->DATA = Byte; + while (!(SPI->STATUS & SPI_IF_bm)); + return SPI->DATA; + } + + /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response + * byte sent to from the attached SPI device is ignored. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + * \param[in] Byte Byte to send through the SPI interface. + */ + static inline void SPI_SendByte(SPI_t* const SPI, + const uint8_t Byte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void SPI_SendByte(SPI_t* const SPI, + const uint8_t Byte) + { + SPI->DATA = Byte; + while (!(SPI->STATUS & SPI_IF_bm)); + } + + /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response + * byte from the attached SPI device is returned. + * + * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device. + * + * \return The response byte from the attached SPI device. + */ + static inline uint8_t SPI_ReceiveByte(SPI_t* const SPI) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SPI_ReceiveByte(SPI_t* const SPI) + { + SPI->DATA = 0; + while (!(SPI->STATUS & SPI_IF_bm)); + return SPI->DATA; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h new file mode 100644 index 0000000000..ca3235083c --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h @@ -0,0 +1,212 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Master SPI Mode Serial USART Peripheral Driver (XMEGA) + * + * On-chip Master SPI mode USART driver for the XMEGA AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI Master + * Mode USART driver dispatch header located in LUFA/Drivers/Peripheral/Serial.h. + */ + +/** \ingroup Group_SerialSPI + * \defgroup Group_SerialSPI_XMEGA Master SPI Mode Serial USART Peripheral Driver (XMEGA) + * + * \section Sec_SerialSPI_XMEGA_ModDescription Module Description + * On-chip serial USART driver for the XMEGA AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the ADC driver + * dispatch header located in LUFA/Drivers/Peripheral/SerialSPI.h. + * + * \section Sec_SerialSPI_XMEGA_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * \code + * // Initialize the Master SPI mode USART driver before first use, with 1Mbit baud + * SerialSPI_Init(&USARTD0, (USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000); + * + * // Send several bytes, ignoring the returned data + * SerialSPI_SendByte(&USARTD0, 0x01); + * SerialSPI_SendByte(&USARTD0, 0x02); + * SerialSPI_SendByte(&USARTD0, 0x03); + * + * // Receive several bytes, sending a dummy 0x00 byte each time + * uint8_t Byte1 = SerialSPI_ReceiveByte(&USARTD); + * uint8_t Byte2 = SerialSPI_ReceiveByte(&USARTD); + * uint8_t Byte3 = SerialSPI_ReceiveByte(&USARTD); + * + * // Send a byte, and store the received byte from the same transaction + * uint8_t ResponseByte = SerialSPI_TransferByte(&USARTD0, 0xDC); + * \endcode + * + * @{ + */ + +#ifndef __SERIAL_SPI_XMEGA_H__ +#define __SERIAL_SPI_XMEGA_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + #include + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SERIAL_SPI_H) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + #define SERIAL_SPI_UBBRVAL(Baud) ((Baud < (F_CPU / 2)) ? ((F_CPU / (2 * Baud)) - 1) : 0) + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name SPI SCK Polarity Configuration Masks */ + //@{ + /** SPI clock polarity mask for \ref SerialSPI_Init(). Indicates that the SCK should lead on the rising edge. */ + #define USART_SPI_SCK_LEAD_RISING 0 + //@} + + /** \name SPI Sample Edge Configuration Masks */ + //@{ + /** SPI data sample mode mask for \ref SerialSPI_Init(). Indicates that the data should sampled on the leading edge. */ + #define USART_SPI_SAMPLE_LEADING 0 + + /** SPI data sample mode mask for \ref SerialSPI_Init(). Indicates that the data should be sampled on the trailing edge. */ + #define USART_SPI_SAMPLE_TRAILING (1 << 1) + //@} + + /** \name SPI Data Ordering Configuration Masks */ + //@{ + /** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out MSB first. */ + #define USART_SPI_ORDER_MSB_FIRST 0 + + /** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */ + #define USART_SPI_ORDER_LSB_FIRST (1 << 2) + //@} + + /* Inline Functions: */ + /** Initialize the USART module in Master SPI mode. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] SPIOptions USART SPI Options, a mask consisting of one of each of the \c USART_SPI_SCK_*, + * \c USART_SPI_SAMPLE_* and \c USART_SPI_ORDER_* masks. + * \param[in] BaudRate SPI baud rate, in bits per second. + */ + static inline void SerialSPI_Init(USART_t* const USART, + const uint8_t SPIOptions, + const uint32_t BaudRate) ATTR_NON_NULL_PTR_ARG(1); + static inline void SerialSPI_Init(USART_t* const USART, + const uint8_t SPIOptions, + const uint32_t BaudRate) + { + uint16_t BaudValue = SERIAL_SPI_UBBRVAL(BaudRate); + + USART->BAUDCTRLB = (BaudValue >> 8); + USART->BAUDCTRLA = (BaudValue & 0xFF); + + USART->CTRLC = (USART_CMODE_MSPI_gc | SPIOptions); + USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm); + } + + /** Turns off the USART driver, disabling and returning used hardware to their default configuration. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + */ + static inline void SerialSPI_Disable(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void SerialSPI_Disable(USART_t* const USART) + { + USART->CTRLA = 0; + USART->CTRLB = 0; + USART->CTRLC = 0; + } + + /** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] DataByte Byte to send through the USART SPI interface. + * + * \return Response byte from the attached SPI device. + */ + static inline uint8_t SerialSPI_TransferByte(USART_t* const USART, + const uint8_t DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SerialSPI_TransferByte(USART_t* const USART, + const uint8_t DataByte) + { + USART->DATA = DataByte; + while (!(USART->STATUS & USART_TXCIF_bm)); + USART->STATUS = USART_TXCIF_bm; + return USART->DATA; + } + + /** Sends a byte through the USART SPI interface, blocking until the transfer is complete. The response + * byte sent to from the attached SPI device is ignored. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] DataByte Byte to send through the USART SPI interface. + */ + static inline void SerialSPI_SendByte(USART_t* const USART, + const uint8_t DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void SerialSPI_SendByte(USART_t* const USART, + const uint8_t DataByte) + { + SerialSPI_TransferByte(USART, DataByte); + } + + /** Sends a dummy byte through the USART SPI interface, blocking until the transfer is complete. The response + * byte from the attached SPI device is returned. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return The response byte from the attached SPI device. + */ + static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART) + { + return SerialSPI_TransferByte(USART, 0); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.c b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.c new file mode 100644 index 0000000000..9ecda47d2d --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.c @@ -0,0 +1,126 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +#include "../../../Common/Common.h" +#if (ARCH == ARCH_XMEGA) + +#define __INCLUDE_FROM_SERIAL_C +#include "../Serial.h" + +FILE USARTSerialStream; + +int Serial_putchar(char DataByte, + FILE *Stream) +{ + USART_t* USART = fdev_get_udata(Stream); + + Serial_SendByte(USART, DataByte); + return 0; +} + +int Serial_getchar(FILE *Stream) +{ + USART_t* USART = fdev_get_udata(Stream); + + if (!(Serial_IsCharReceived(USART))) + return _FDEV_EOF; + + return Serial_ReceiveByte(USART); +} + +int Serial_getchar_Blocking(FILE *Stream) +{ + USART_t* USART = fdev_get_udata(Stream); + + while (!(Serial_IsCharReceived(USART))); + return Serial_ReceiveByte(USART); +} + +void Serial_SendString_P(USART_t* const USART, + const char* FlashStringPtr) +{ + uint8_t CurrByte; + + while ((CurrByte = pgm_read_byte(FlashStringPtr)) != 0x00) + { + Serial_SendByte(USART, CurrByte); + FlashStringPtr++; + } +} + +void Serial_SendString(USART_t* const USART, + const char* StringPtr) +{ + uint8_t CurrByte; + + while ((CurrByte = *StringPtr) != 0x00) + { + Serial_SendByte(USART, CurrByte); + StringPtr++; + } +} + +void Serial_SendData(USART_t* const USART, + const void* Buffer, + uint16_t Length) +{ + uint8_t* CurrByte = (uint8_t*)Buffer; + + while (Length--) + Serial_SendByte(USART, *(CurrByte++)); +} + +void Serial_CreateStream(USART_t* USART, FILE* Stream) +{ + if (!(Stream)) + { + Stream = &USARTSerialStream; + stdin = Stream; + stdout = Stream; + } + + *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW); + fdev_set_udata(Stream, USART); +} + +void Serial_CreateBlockingStream(USART_t* USART, FILE* Stream) +{ + if (!(Stream)) + { + Stream = &USARTSerialStream; + stdin = Stream; + stdout = Stream; + } + + *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar_Blocking, _FDEV_SETUP_RW); + fdev_set_udata(Stream, USART); +} + +#endif diff --git a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h new file mode 100644 index 0000000000..36f507d43e --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h @@ -0,0 +1,289 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Serial USART Peripheral Driver (XMEGA) + * + * On-chip serial USART driver for the XMEGA AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the USART driver + * dispatch header located in LUFA/Drivers/Peripheral/Serial.h. + */ + +/** \ingroup Group_Serial + * \defgroup Group_Serial_XMEGA Serial USART Peripheral Driver (XMEGA) + * + * \section Sec_Serial_XMEGA_ModDescription Module Description + * On-chip serial USART driver for the XMEGA AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the USART driver + * dispatch header located in LUFA/Drivers/Peripheral/Serial.h. + * + * \section Sec_Serial_XMEGA_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * \code + * // Initialize the serial USART driver before first use, with 9600 baud (and no double-speed mode) + * Serial_Init(&USARTD0, 9600, false); + * + * // Send a string through the USART + * Serial_TxString(&USARTD0, "Test String\r\n"); + * + * // Receive a byte through the USART + * uint8_t DataByte = Serial_RxByte(&USARTD0); + * \endcode + * + * @{ + */ + +#ifndef __SERIAL_XMEGA_H__ +#define __SERIAL_XMEGA_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + #include "../../Misc/TerminalCodes.h" + + #include + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SERIAL_H) && !defined(__INCLUDE_FROM_SERIAL_C) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead. + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* External Variables: */ + extern FILE USARTSerialStream; + + /* Function Prototypes: */ + int Serial_putchar(char DataByte, + FILE *Stream); + int Serial_getchar(FILE *Stream); + int Serial_getchar_Blocking(FILE *Stream); + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** Macro for calculating the baud value from a given baud rate when the \c U2X (double speed) bit is + * not set. + * + * \param[in] Baud Target serial UART baud rate. + * + * \return Closest UBRR register value for the given UART frequency. + */ + #define SERIAL_UBBRVAL(Baud) ((((F_CPU / 16) + (Baud / 2)) / (Baud)) - 1) + + /** Macro for calculating the baud value from a given baud rate when the \c U2X (double speed) bit is + * set. + * + * \param[in] Baud Target serial UART baud rate. + * + * \return Closest UBRR register value for the given UART frequency. + */ + #define SERIAL_2X_UBBRVAL(Baud) ((((F_CPU / 8) + (Baud / 2)) / (Baud)) - 1) + + /* Function Prototypes: */ + /** Transmits a given string located in program space (FLASH) through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] FlashStringPtr Pointer to a string located in program space. + */ + void Serial_SendString_P(USART_t* const USART, + const char* FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given string located in SRAM memory through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] StringPtr Pointer to a string located in SRAM space. + */ + void Serial_SendString(USART_t* const USART, + const char* StringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given buffer located in SRAM memory through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] Buffer Pointer to a buffer containing the data to send. + * \param[in] Length Length of the data to send, in bytes. + */ + void Serial_SendData(USART_t* const USART, + const void* Buffer, + uint16_t Length) ATTR_NON_NULL_PTR_ARG(1); + + /** Creates a standard character stream from the USART so that it can be used with all the regular functions + * in the avr-libc \c library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created + * stream is bidirectional and can be used for both input and output functions. + * + * Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single + * fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may + * be used when the read data is processed byte-per-bye (via \c getc()) or when the user application will implement its own + * line buffering. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout + * and \c stdin will be configured to use the USART. + * + * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used. + */ + void Serial_CreateStream(USART_t* USART, FILE* Stream); + + /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates + * the transfer. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout + * and \c stdin will be configured to use the USART. + * + * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used. + */ + void Serial_CreateBlockingStream(USART_t* USART, FILE* Stream); + + /* Inline Functions: */ + /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to + * standard 8-bit, no parity, 1 stop bit settings suitable for most applications. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] BaudRate Serial baud rate, in bits per second. This should be the target baud rate regardless of + * the \c DoubleSpeed parameter's value. + * \param[in] DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate. + */ + static inline void Serial_Init(USART_t* const USART, + const uint32_t BaudRate, + const bool DoubleSpeed) ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_Init(USART_t* const USART, + const uint32_t BaudRate, + const bool DoubleSpeed) + { + uint16_t BaudValue = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate)); + + USART->BAUDCTRLB = (BaudValue >> 8); + USART->BAUDCTRLA = (BaudValue & 0xFF); + + USART->CTRLC = (USART_CMODE_ASYNCHRONOUS_gc | USART_PMODE_DISABLED_gc | USART_CHSIZE_8BIT_gc); + USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm | (DoubleSpeed ? USART_CLK2X_bm : 0)); + } + + /** Turns off the USART driver, disabling and returning used hardware to their default configuration. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + */ + static inline void Serial_Disable(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_Disable(USART_t* const USART) + { + USART->CTRLA = 0; + USART->CTRLB = 0; + USART->CTRLC = 0; + } + + /** Indicates whether a character has been received through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Boolean \c true if a character has been received, \c false otherwise. + */ + static inline bool Serial_IsCharReceived(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline bool Serial_IsCharReceived(USART_t* const USART) + { + return ((USART->STATUS & USART_RXCIF_bm) ? true : false); + } + + /** Indicates whether there is hardware buffer space for a new transmit on the USART. This + * function can be used to determine if a call to \ref Serial_SendByte() will block in advance. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Boolean \c true if a character can be queued for transmission immediately, \c false otherwise. + */ + static inline bool Serial_IsSendReady(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline bool Serial_IsSendReady(USART_t* const USART) + { + return (USART->STATUS & USART_DREIF_bm) ? true : false; + } + + /** Indicates whether the hardware USART transmit buffer is completely empty, indicating all + * pending transmissions have completed. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Boolean \c true if no characters are buffered for transmission, \c false otherwise. + */ + static inline bool Serial_IsSendComplete(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline bool Serial_IsSendComplete(USART_t* const USART) + { + return (USART->STATUS & USART_TXCIF_bm) ? true : false; + } + + /** Transmits a given byte through the USART. + * + * \note If no buffer space is available in the hardware USART, this function will block. To check if + * space is available before calling this function, see \ref Serial_IsSendReady(). + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] DataByte Byte to transmit through the USART. + */ + static inline void Serial_SendByte(USART_t* const USART, + const char DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_SendByte(USART_t* const USART, + const char DataByte) + { + while (!(Serial_IsSendReady(USART))); + USART->DATA = DataByte; + } + + /** Receives the next byte from the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Next byte received from the USART, or a negative value if no byte has been received. + */ + static inline int16_t Serial_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline int16_t Serial_ReceiveByte(USART_t* const USART) + { + if (!(Serial_IsCharReceived(USART))) + return -1; + + USART->STATUS = USART_RXCIF_bm; + return USART->DATA; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + diff --git a/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c new file mode 100644 index 0000000000..92cc643b9e --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c @@ -0,0 +1,185 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +#include "../../../Common/Common.h" +#if (ARCH == ARCH_XMEGA) + +#define __INCLUDE_FROM_TWI_C +#include "../TWI.h" + +uint8_t TWI_StartTransmission(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS) +{ + uint16_t TimeoutRemaining; + + TWI->MASTER.ADDR = SlaveAddress; + + TimeoutRemaining = (TimeoutMS * 100); + while (TimeoutRemaining) + { + uint8_t status = TWI->MASTER.STATUS; + + if ((status & (TWI_MASTER_WIF_bm | TWI_MASTER_ARBLOST_bm)) == (TWI_MASTER_WIF_bm | TWI_MASTER_ARBLOST_bm)) + { + TWI->MASTER.ADDR = SlaveAddress; + } + else if ((status & (TWI_MASTER_WIF_bm | TWI_MASTER_RXACK_bm)) == (TWI_MASTER_WIF_bm | TWI_MASTER_RXACK_bm)) + { + TWI_StopTransmission(TWI); + return TWI_ERROR_SlaveResponseTimeout; + } + else if (status & (TWI_MASTER_WIF_bm | TWI_MASTER_RIF_bm)) + { + return TWI_ERROR_NoError; + } + + _delay_us(10); + TimeoutRemaining--; + } + + if (!(TimeoutRemaining)) { + if (TWI->MASTER.STATUS & TWI_MASTER_CLKHOLD_bm) { + TWI_StopTransmission(TWI); + } + } + + return TWI_ERROR_BusCaptureTimeout; +} + +bool TWI_SendByte(TWI_t* const TWI, + const uint8_t Byte) +{ + TWI->MASTER.DATA = Byte; + + while (!(TWI->MASTER.STATUS & TWI_MASTER_WIF_bm)); + + return (TWI->MASTER.STATUS & TWI_MASTER_WIF_bm) && !(TWI->MASTER.STATUS & TWI_MASTER_RXACK_bm); +} + +bool TWI_ReceiveByte(TWI_t* const TWI, + uint8_t* const Byte, + const bool LastByte) +{ + if ((TWI->MASTER.STATUS & (TWI_MASTER_BUSERR_bm | TWI_MASTER_ARBLOST_bm)) == (TWI_MASTER_BUSERR_bm | TWI_MASTER_ARBLOST_bm)) { + return false; + } + + while (!(TWI->MASTER.STATUS & TWI_MASTER_RIF_bm)); + + *Byte = TWI->MASTER.DATA; + + if (LastByte) + TWI->MASTER.CTRLC = TWI_MASTER_ACKACT_bm | TWI_MASTER_CMD_STOP_gc; + else + TWI->MASTER.CTRLC = TWI_MASTER_CMD_RECVTRANS_gc; + + return true; +} + +uint8_t TWI_ReadPacket(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + uint8_t* Buffer, + uint16_t Length) +{ + uint8_t ErrorCode; + + if ((ErrorCode = TWI_StartTransmission(TWI, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE, + TimeoutMS)) == TWI_ERROR_NoError) + { + while (InternalAddressLen--) + { + if (!(TWI_SendByte(TWI, *(InternalAddress++)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + if ((ErrorCode = TWI_StartTransmission(TWI, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_READ, + TimeoutMS)) == TWI_ERROR_NoError) + { + while (Length--) + { + if (!(TWI_ReceiveByte(TWI, Buffer++, (Length == 0)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + } + + TWI_StopTransmission(TWI); + } + + return ErrorCode; +} + +uint8_t TWI_WritePacket(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + const uint8_t* Buffer, + uint16_t Length) +{ + uint8_t ErrorCode; + + if ((ErrorCode = TWI_StartTransmission(TWI, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE, + TimeoutMS)) == TWI_ERROR_NoError) + { + while (InternalAddressLen--) + { + if (!(TWI_SendByte(TWI, *(InternalAddress++)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + while (Length--) + { + if (!(TWI_SendByte(TWI, *(Buffer++)))) + { + ErrorCode = TWI_ERROR_SlaveNAK; + break; + } + } + + TWI_StopTransmission(TWI); + } + + return ErrorCode; +} + +#endif diff --git a/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h new file mode 100644 index 0000000000..94ada73719 --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h @@ -0,0 +1,302 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief TWI Peripheral Driver (XMEGA) + * + * On-chip TWI driver for the XMEGA Family of AVR microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the TWI driver + * dispatch header located in LUFA/Drivers/Peripheral/TWI.h. + */ + +/** \ingroup Group_TWI + * \defgroup Group_TWI_XMEGA TWI Peripheral Driver (XMEGA) + * + * \section Sec_TWI_XMEGA_ModDescription Module Description + * Master mode TWI driver for the 8-bit AVR microcontrollers which contain a hardware TWI module. + * + * \note This file should not be included directly. It is automatically included as needed by the TWI driver + * dispatch header located in LUFA/Drivers/Peripheral/TWI.h. + * + * \section Sec_TWI_XMEGA_ExampleUsage Example Usage + * The following snippet is an example of how this module may be used within a typical + * application. + * + * Low Level API Example: + * \code + * // Initialize the TWI driver before first use at 200KHz + * TWI_Init(&TWIC, TWI_BAUD_FROM_FREQ(200000)); + * + * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout + * if (TWI_StartTransmission(&TWIC, 0xA0 | TWI_ADDRESS_WRITE, 10) == TWI_ERROR_NoError) + * { + * TWI_SendByte(&TWIC, 0xDC); + * + * TWI_SendByte(&TWIC, 0x01); + * TWI_SendByte(&TWIC, 0x02); + * TWI_SendByte(&TWIC, 0x03); + * + * // Must stop transmission afterwards to release the bus + * TWI_StopTransmission(&TWIC); + * } + * + * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout + * if (TWI_StartTransmission(&TWIC, 0xA0 | TWI_ADDRESS_WRITE, 10) == TWI_ERROR_NoError) + * { + * TWI_SendByte(&TWIC, 0xDC); + * TWI_StopTransmission(&TWIC); + * + * if (TWI_StartTransmission(&TWIC, 0xA0 | TWI_ADDRESS_READ, 10) == TWI_ERROR_NoError) + * { + * uint8_t Byte1, Byte2, Byte3; + * + * // Read three bytes, acknowledge after the third byte is received + * TWI_ReceiveByte(&TWIC, &Byte1, false); + * TWI_ReceiveByte(&TWIC, &Byte2, false); + * TWI_ReceiveByte(&TWIC, &Byte3, true); + * + * // Must stop transmission afterwards to release the bus + * TWI_StopTransmission(&TWIC); + * } + * } + * \endcode + * + * High Level API Example: + * \code + * // Initialize the TWI driver before first use at 200KHz + * TWI_Init(&TWIC, TWI_BAUD_FROM_FREQ(200000)); + * + * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout + * uint8_t InternalWriteAddress = 0xDC; + * uint8_t WritePacket[3] = {0x01, 0x02, 0x03}; + * + * TWI_WritePacket(&TWIC, 0xA0, 10, &InternalWriteAddress, sizeof(InternalWriteAddress), + * &WritePacket, sizeof(WritePacket); + * + * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout + * uint8_t InternalReadAddress = 0xDC; + * uint8_t ReadPacket[3]; + * + * TWI_ReadPacket(&TWIC, 0xA0, 10, &InternalReadAddress, sizeof(InternalReadAddress), + * &ReadPacket, sizeof(ReadPacket); + * \endcode + * + * @{ + */ + +#ifndef __TWI_XMEGA_H__ +#define __TWI_XMEGA_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + + #include + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_TWI_H) && !defined(__INCLUDE_FROM_TWI_C) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/TWI.h instead. + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** TWI slave device address mask for a read session. Mask with a slave device base address to obtain + * the correct TWI bus address for the slave device when reading data from it. + */ + #define TWI_ADDRESS_READ 0x01 + + /** TWI slave device address mask for a write session. Mask with a slave device base address to obtain + * the correct TWI bus address for the slave device when writing data to it. + */ + #define TWI_ADDRESS_WRITE 0x00 + + /** Mask to retrieve the base address for a TWI device, which can then be ORed with \ref TWI_ADDRESS_READ + * or \ref TWI_ADDRESS_WRITE to obtain the device's read and write address respectively. + */ + #define TWI_DEVICE_ADDRESS_MASK 0xFE + + /** Calculates the length of each bit on the TWI bus for a given target frequency. This may be used with + * the \ref TWI_Init() function to convert a bus frequency to a number of clocks for the \c BitLength + * parameter. + * + * \param[in] Frequency Desired TWI bus frequency in Hz. + * + * \return Bit length in clocks for the given TWI bus frequency at the given prescaler value. + */ + #define TWI_BAUD_FROM_FREQ(Frequency) ((F_CPU / (2 * Frequency)) - 5) + + /* Enums: */ + /** Enum for the possible return codes of the TWI transfer start routine and other dependant TWI functions. */ + enum TWI_ErrorCodes_t + { + TWI_ERROR_NoError = 0, /**< Indicates that the command completed successfully. */ + TWI_ERROR_BusFault = 1, /**< A TWI bus fault occurred while attempting to capture the bus. */ + TWI_ERROR_BusCaptureTimeout = 2, /**< A timeout occurred whilst waiting for the bus to be ready. */ + TWI_ERROR_SlaveResponseTimeout = 3, /**< No ACK received at the nominated slave address within the timeout period. */ + TWI_ERROR_SlaveNotReady = 4, /**< Slave NAKed the TWI bus START condition. */ + TWI_ERROR_SlaveNAK = 5, /**< Slave NAKed whilst attempting to send data to the device. */ + }; + + /* Inline Functions: */ + /** Initializes the TWI hardware into master mode, ready for data transmission and reception. This must be + * before any other TWI operations. + * + * The generated SCL frequency will be according to the formula 
F_CPU / (2 * (5 + (BAUD)))
. + * + * \attention The value of the \c BitLength parameter should not be set below 10 or invalid bus conditions may + * occur, as indicated in the XMEGA microcontroller datasheet. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] Baud Value of the BAUD register of the TWI Master. + */ + static inline void TWI_Init(TWI_t* const TWI, + const uint8_t Baud) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void TWI_Init(TWI_t* const TWI, + const uint8_t Baud) + { + TWI->CTRL = 0x00; + TWI->MASTER.BAUD = Baud; + TWI->MASTER.CTRLA = TWI_MASTER_ENABLE_bm; + TWI->MASTER.CTRLB = 0; + TWI->MASTER.STATUS = TWI_MASTER_BUSSTATE_IDLE_gc; + } + + /** Turns off the TWI driver hardware. If this is called, any further TWI operations will require a call to + * \ref TWI_Init() before the TWI can be used again. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + */ + static inline void TWI_Disable(TWI_t* const TWI) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void TWI_Disable(TWI_t* const TWI) + { + TWI->MASTER.CTRLA &= ~TWI_MASTER_ENABLE_bm; + } + + /** Sends a TWI STOP onto the TWI bus, terminating communication with the currently addressed device. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + */ + static inline void TWI_StopTransmission(TWI_t* const TWI) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void TWI_StopTransmission(TWI_t* const TWI) + { + TWI->MASTER.CTRLC = TWI_MASTER_ACKACT_bm | TWI_MASTER_CMD_STOP_gc; + } + + /* Function Prototypes: */ + /** Begins a master mode TWI bus communication with the given slave device address. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] SlaveAddress Address of the slave TWI device to communicate with. + * \param[in] TimeoutMS Timeout period within which the slave must respond, in milliseconds. + * + * \return A value from the \ref TWI_ErrorCodes_t enum. + */ + uint8_t TWI_StartTransmission(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS) ATTR_NON_NULL_PTR_ARG(1); + + /** Sends a byte to the currently addressed device on the TWI bus. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] Byte Byte to send to the currently addressed device + * + * \return Boolean \c true if the recipient ACKed the byte, \c false otherwise + */ + bool TWI_SendByte(TWI_t* const TWI, + const uint8_t Byte) ATTR_NON_NULL_PTR_ARG(1); + + /** Receives a byte from the currently addressed device on the TWI bus. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] Byte Location where the read byte is to be stored. + * \param[in] LastByte Indicates if the byte should be ACKed if false, NAKed if true. + * + * \return Boolean \c true if the byte reception successfully completed, \c false otherwise. + */ + bool TWI_ReceiveByte(TWI_t* const TWI, + uint8_t* const Byte, + const bool LastByte) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); + + /** High level function to perform a complete packet transfer over the TWI bus to the specified + * device. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] SlaveAddress Base address of the TWI slave device to communicate with. + * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds. + * \param[in] InternalAddress Pointer to a location where the internal slave read start address is stored. + * \param[in] InternalAddressLen Size of the internal device address, in bytes. + * \param[in] Buffer Pointer to a buffer where the read packet data is to be stored. + * \param[in] Length Size of the packet to read, in bytes. + * + * \return A value from the \ref TWI_ErrorCodes_t enum. + */ + uint8_t TWI_ReadPacket(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + uint8_t* Buffer, + uint16_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4); + + /** High level function to perform a complete packet transfer over the TWI bus from the specified + * device. + * + * \param[in] TWI Pointer to the base of the TWI peripheral within the device. + * \param[in] SlaveAddress Base address of the TWI slave device to communicate with + * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds + * \param[in] InternalAddress Pointer to a location where the internal slave write start address is stored + * \param[in] InternalAddressLen Size of the internal device address, in bytes + * \param[in] Buffer Pointer to a buffer where the packet data to send is stored + * \param[in] Length Size of the packet to send, in bytes + * + * \return A value from the \ref TWI_ErrorCodes_t enum. + */ + uint8_t TWI_WritePacket(TWI_t* const TWI, + const uint8_t SlaveAddress, + const uint8_t TimeoutMS, + const uint8_t* InternalAddress, + uint8_t InternalAddressLen, + const uint8_t* Buffer, + uint16_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4); + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + -- cgit v1.2.3