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// Copyright 2021 QMK
// Copyright 2022 Stefan Kerkmann
// SPDX-License-Identifier: GPL-2.0-or-later
#include "serial_usart.h"
#include "serial_protocol.h"
#include "synchronization_util.h"
#if defined(SERIAL_USART_CONFIG)
static QMKSerialConfig serial_config = SERIAL_USART_CONFIG;
#elif defined(MCU_STM32) /* STM32 MCUs */
static QMKSerialConfig serial_config = {
# if HAL_USE_SERIAL
.speed = (SERIAL_USART_SPEED),
# else
.baud = (SERIAL_USART_SPEED),
# endif
.cr1 = (SERIAL_USART_CR1),
.cr2 = (SERIAL_USART_CR2),
# if !defined(SERIAL_USART_FULL_DUPLEX)
.cr3 = ((SERIAL_USART_CR3) | USART_CR3_HDSEL) /* activate half-duplex mode */
# else
.cr3 = (SERIAL_USART_CR3)
# endif
};
#elif defined(MCU_RP) /* Raspberry Pi MCUs */
/* USART in 8E2 config with RX and TX FIFOs enabled. */
// clang-format off
static QMKSerialConfig serial_config = {
.baud = (SERIAL_USART_SPEED),
.UARTLCR_H = UART_UARTLCR_H_WLEN_8BITS | UART_UARTLCR_H_PEN | UART_UARTLCR_H_STP2 | UART_UARTLCR_H_FEN,
.UARTCR = 0U,
.UARTIFLS = UART_UARTIFLS_RXIFLSEL_1_8F | UART_UARTIFLS_TXIFLSEL_1_8E,
.UARTDMACR = 0U
};
// clang-format on
#else
# error MCU Familiy not supported by default, supply your own serial_config by defining SERIAL_USART_CONFIG in your keyboard files.
#endif
static QMKSerialDriver* serial_driver = (QMKSerialDriver*)&SERIAL_USART_DRIVER;
#if HAL_USE_SERIAL
/**
* @brief SERIAL Driver startup routine.
*/
static inline void usart_driver_start(void) {
sdStart(serial_driver, &serial_config);
}
inline void serial_transport_driver_clear(void) {
osalSysLock();
bool volatile queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
osalSysUnlock();
while (queue_not_empty) {
osalSysLock();
/* Hard reset the input queue. */
iqResetI(&serial_driver->iqueue);
osalSysUnlock();
/* Allow pending interrupts to preempt.
* Do not merge the lock/unlock blocks into one
* or the code will not work properly.
* The empty read adds a tiny amount of delay. */
(void)queue_not_empty;
osalSysLock();
queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
osalSysUnlock();
}
}
#elif HAL_USE_SIO
/**
* @brief SIO Driver startup routine.
*/
static inline void usart_driver_start(void) {
sioStart(serial_driver, &serial_config);
}
inline void serial_transport_driver_clear(void) {
if (sioHasRXErrorsX(serial_driver)) {
sioGetAndClearErrors(serial_driver);
}
osalSysLock();
while (!sioIsRXEmptyX(serial_driver)) {
(void)sioGetX(serial_driver);
}
osalSysUnlock();
}
#else
# error Either the SERIAL or SIO driver has to be activated to use the usart driver for split keyboards.
#endif
inline bool serial_transport_send(const uint8_t* source, const size_t size) {
bool success = (size_t)chnWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
#if !defined(SERIAL_USART_FULL_DUPLEX)
/* Half duplex fills the input queue with the data we wrote - just throw it away. */
if (likely(success)) {
size_t bytes_left = size;
# if HAL_USE_SERIAL
/* The SERIAL driver uses large soft FIFOs that are filled from an IRQ
* context, so there is a delay between receiving the data and it
* becoming actually available, therefore we have to apply a timeout
* mechanism. Under the right circumstances (e.g. bad cables paired with
* high baud rates) less bytes can be present in the input queue as
* well. */
uint8_t dump[64];
while (unlikely(bytes_left >= 64)) {
if (unlikely(!serial_transport_receive(dump, 64))) {
return false;
}
bytes_left -= 64;
}
return serial_transport_receive(dump, bytes_left);
# else
/* The SIO driver directly accesses the hardware FIFOs of the USART
* peripheral. As these are limited in depth, the RX FIFO might have
* been overflowed by a large transaction that we just send. Therefore
* we attempt to read back all the data we send or until the FIFO runs
* empty in case it overflowed and data was truncated. */
if (unlikely(sioSynchronizeTXEnd(serial_driver, TIME_MS2I(SERIAL_USART_TIMEOUT)) < MSG_OK)) {
return false;
}
osalSysLock();
while (bytes_left > 0 && !sioIsRXEmptyX(serial_driver)) {
(void)sioGetX(serial_driver);
bytes_left--;
}
osalSysUnlock();
# endif
}
#endif
return success;
}
inline bool serial_transport_receive(uint8_t* destination, const size_t size) {
bool success = (size_t)chnReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
return success;
}
inline bool serial_transport_receive_blocking(uint8_t* destination, const size_t size) {
bool success = (size_t)chnRead(serial_driver, destination, size) == size;
return success;
}
#if !defined(SERIAL_USART_FULL_DUPLEX)
/**
* @brief Initiate pins for USART peripheral. Half-duplex configuration.
*/
__attribute__((weak)) void usart_init(void) {
# if defined(MCU_STM32) /* STM32 MCUs */
# if defined(USE_GPIOV1)
palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_OPENDRAIN);
# else
palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_OUTPUT_TYPE_OPENDRAIN);
# endif
# if defined(USART_REMAP)
USART_REMAP;
# endif
# elif defined(MCU_RP) /* Raspberry Pi MCUs */
# error Half-duplex with the SIO driver is not supported due to hardware limitations on the RP2040, switch to the PIO driver which has half-duplex support.
# else
# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
# endif
}
#else
/**
* @brief Initiate pins for USART peripheral. Full-duplex configuration.
*/
__attribute__((weak)) void usart_init(void) {
# if defined(MCU_STM32) /* STM32 MCUs */
# if defined(USE_GPIOV1)
palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_PUSHPULL);
palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_INPUT);
# else
palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_RX_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
# endif
# if defined(USART_REMAP)
USART_REMAP;
# endif
# elif defined(MCU_RP) /* Raspberry Pi MCUs */
palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_UART);
palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_ALTERNATE_UART);
# else
# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
# endif
}
#endif
/**
* @brief Overridable master specific initializations.
*/
__attribute__((weak, nonnull)) void usart_master_init(QMKSerialDriver** driver) {
(void)driver;
usart_init();
}
/**
* @brief Overridable slave specific initializations.
*/
__attribute__((weak, nonnull)) void usart_slave_init(QMKSerialDriver** driver) {
(void)driver;
usart_init();
}
void serial_transport_driver_slave_init(void) {
usart_slave_init(&serial_driver);
usart_driver_start();
}
void serial_transport_driver_master_init(void) {
usart_master_init(&serial_driver);
#if defined(MCU_STM32) && defined(SERIAL_USART_PIN_SWAP)
serial_config.cr2 |= USART_CR2_SWAP; // master has swapped TX/RX pins
#endif
usart_driver_start();
}
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