diff options
Diffstat (limited to 'drivers/avr')
| -rw-r--r-- | drivers/avr/TWIlib.c | 232 | ||||
| -rw-r--r-- | drivers/avr/TWIlib.h | 82 | ||||
| -rwxr-xr-x | drivers/avr/i2c_master.c | 149 | ||||
| -rwxr-xr-x | drivers/avr/i2c_master.h | 22 | ||||
| -rw-r--r-- | drivers/avr/is31fl3731.c | 36 |
5 files changed, 182 insertions, 339 deletions
diff --git a/drivers/avr/TWIlib.c b/drivers/avr/TWIlib.c deleted file mode 100644 index b39e3054a5..0000000000 --- a/drivers/avr/TWIlib.c +++ /dev/null @@ -1,232 +0,0 @@ -/* - * TWIlib.c - * - * Created: 6/01/2014 10:41:33 PM - * Author: Chris Herring - * http://www.chrisherring.net/all/tutorial-interrupt-driven-twi-interface-for-avr-part1/ - */ - -#include <avr/io.h> -#include <avr/interrupt.h> -#include "TWIlib.h" -#include "util/delay.h" - -void TWIInit() -{ - TWIInfo.mode = Ready; - TWIInfo.errorCode = 0xFF; - TWIInfo.repStart = 0; - // Set pre-scalers (no pre-scaling) - TWSR = 0; - // Set bit rate - TWBR = ((F_CPU / TWI_FREQ) - 16) / 2; - // Enable TWI and interrupt - TWCR = (1 << TWIE) | (1 << TWEN); -} - -uint8_t isTWIReady() -{ - if ( (TWIInfo.mode == Ready) | (TWIInfo.mode == RepeatedStartSent) ) - { - return 1; - } - else - { - return 0; - } -} - -uint8_t TWITransmitData(void *const TXdata, uint8_t dataLen, uint8_t repStart) -{ - if (dataLen <= TXMAXBUFLEN) - { - // Wait until ready - while (!isTWIReady()) {_delay_us(1);} - // Set repeated start mode - TWIInfo.repStart = repStart; - // Copy data into the transmit buffer - uint8_t *data = (uint8_t *)TXdata; - for (int i = 0; i < dataLen; i++) - { - TWITransmitBuffer[i] = data[i]; - } - // Copy transmit info to global variables - TXBuffLen = dataLen; - TXBuffIndex = 0; - - // If a repeated start has been sent, then devices are already listening for an address - // and another start does not need to be sent. - if (TWIInfo.mode == RepeatedStartSent) - { - TWIInfo.mode = Initializing; - TWDR = TWITransmitBuffer[TXBuffIndex++]; // Load data to transmit buffer - TWISendTransmit(); // Send the data - } - else // Otherwise, just send the normal start signal to begin transmission. - { - TWIInfo.mode = Initializing; - TWISendStart(); - } - - } - else - { - return 1; // return an error if data length is longer than buffer - } - return 0; -} - -uint8_t TWIReadData(uint8_t TWIaddr, uint8_t bytesToRead, uint8_t repStart) -{ - // Check if number of bytes to read can fit in the RXbuffer - if (bytesToRead < RXMAXBUFLEN) - { - // Reset buffer index and set RXBuffLen to the number of bytes to read - RXBuffIndex = 0; - RXBuffLen = bytesToRead; - // Create the one value array for the address to be transmitted - uint8_t TXdata[1]; - // Shift the address and AND a 1 into the read write bit (set to write mode) - TXdata[0] = (TWIaddr << 1) | 0x01; - // Use the TWITransmitData function to initialize the transfer and address the slave - TWITransmitData(TXdata, 1, repStart); - } - else - { - return 0; - } - return 1; -} - -ISR (TWI_vect) -{ - switch (TWI_STATUS) - { - // ----\/ ---- MASTER TRANSMITTER OR WRITING ADDRESS ----\/ ---- // - case TWI_MT_SLAW_ACK: // SLA+W transmitted and ACK received - // Set mode to Master Transmitter - TWIInfo.mode = MasterTransmitter; - case TWI_START_SENT: // Start condition has been transmitted - case TWI_MT_DATA_ACK: // Data byte has been transmitted, ACK received - if (TXBuffIndex < TXBuffLen) // If there is more data to send - { - TWDR = TWITransmitBuffer[TXBuffIndex++]; // Load data to transmit buffer - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - TWISendTransmit(); // Send the data - } - // This transmission is complete however do not release bus yet - else if (TWIInfo.repStart) - { - TWIInfo.errorCode = 0xFF; - TWISendStart(); - } - // All transmissions are complete, exit - else - { - TWIInfo.mode = Ready; - TWIInfo.errorCode = 0xFF; - TWISendStop(); - } - break; - - // ----\/ ---- MASTER RECEIVER ----\/ ---- // - - case TWI_MR_SLAR_ACK: // SLA+R has been transmitted, ACK has been received - // Switch to Master Receiver mode - TWIInfo.mode = MasterReceiver; - // If there is more than one byte to be read, receive data byte and return an ACK - if (RXBuffIndex < RXBuffLen-1) - { - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - TWISendACK(); - } - // Otherwise when a data byte (the only data byte) is received, return NACK - else - { - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - TWISendNACK(); - } - break; - - case TWI_MR_DATA_ACK: // Data has been received, ACK has been transmitted. - - /// -- HANDLE DATA BYTE --- /// - TWIReceiveBuffer[RXBuffIndex++] = TWDR; - // If there is more than one byte to be read, receive data byte and return an ACK - if (RXBuffIndex < RXBuffLen-1) - { - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - TWISendACK(); - } - // Otherwise when a data byte (the only data byte) is received, return NACK - else - { - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - TWISendNACK(); - } - break; - - case TWI_MR_DATA_NACK: // Data byte has been received, NACK has been transmitted. End of transmission. - - /// -- HANDLE DATA BYTE --- /// - TWIReceiveBuffer[RXBuffIndex++] = TWDR; - // This transmission is complete however do not release bus yet - if (TWIInfo.repStart) - { - TWIInfo.errorCode = 0xFF; - TWISendStart(); - } - // All transmissions are complete, exit - else - { - TWIInfo.mode = Ready; - TWIInfo.errorCode = 0xFF; - TWISendStop(); - } - break; - - // ----\/ ---- MT and MR common ----\/ ---- // - - case TWI_MR_SLAR_NACK: // SLA+R transmitted, NACK received - case TWI_MT_SLAW_NACK: // SLA+W transmitted, NACK received - case TWI_MT_DATA_NACK: // Data byte has been transmitted, NACK received - case TWI_LOST_ARBIT: // Arbitration has been lost - // Return error and send stop and set mode to ready - if (TWIInfo.repStart) - { - TWIInfo.errorCode = TWI_STATUS; - TWISendStart(); - } - // All transmissions are complete, exit - else - { - TWIInfo.mode = Ready; - TWIInfo.errorCode = TWI_STATUS; - TWISendStop(); - } - break; - case TWI_REP_START_SENT: // Repeated start has been transmitted - // Set the mode but DO NOT clear TWINT as the next data is not yet ready - TWIInfo.mode = RepeatedStartSent; - break; - - // ----\/ ---- SLAVE RECEIVER ----\/ ---- // - - // TODO IMPLEMENT SLAVE RECEIVER FUNCTIONALITY - - // ----\/ ---- SLAVE TRANSMITTER ----\/ ---- // - - // TODO IMPLEMENT SLAVE TRANSMITTER FUNCTIONALITY - - // ----\/ ---- MISCELLANEOUS STATES ----\/ ---- // - case TWI_NO_RELEVANT_INFO: // It is not really possible to get into this ISR on this condition - // Rather, it is there to be manually set between operations - break; - case TWI_ILLEGAL_START_STOP: // Illegal START/STOP, abort and return error - TWIInfo.errorCode = TWI_ILLEGAL_START_STOP; - TWIInfo.mode = Ready; - TWISendStop(); - break; - } - -} diff --git a/drivers/avr/TWIlib.h b/drivers/avr/TWIlib.h deleted file mode 100644 index 23fd1f09aa..0000000000 --- a/drivers/avr/TWIlib.h +++ /dev/null @@ -1,82 +0,0 @@ -/* - * TWIlib.h - * - * Created: 6/01/2014 10:38:42 PM - * Author: Chris Herring - * http://www.chrisherring.net/all/tutorial-interrupt-driven-twi-interface-for-avr-part1/ - */ - - -#ifndef TWILIB_H_ -#define TWILIB_H_ -// TWI bit rate (was 100000) -#define TWI_FREQ 400000 -// Get TWI status -#define TWI_STATUS (TWSR & 0xF8) -// Transmit buffer length -#define TXMAXBUFLEN 20 -// Receive buffer length -#define RXMAXBUFLEN 20 -// Global transmit buffer -uint8_t TWITransmitBuffer[TXMAXBUFLEN]; -// Global receive buffer -volatile uint8_t TWIReceiveBuffer[RXMAXBUFLEN]; -// Buffer indexes -volatile int TXBuffIndex; // Index of the transmit buffer. Is volatile, can change at any time. -int RXBuffIndex; // Current index in the receive buffer -// Buffer lengths -int TXBuffLen; // The total length of the transmit buffer -int RXBuffLen; // The total number of bytes to read (should be less than RXMAXBUFFLEN) - -typedef enum { - Ready, - Initializing, - RepeatedStartSent, - MasterTransmitter, - MasterReceiver, - SlaceTransmitter, - SlaveReciever - } TWIMode; - - typedef struct TWIInfoStruct{ - TWIMode mode; - uint8_t errorCode; - uint8_t repStart; - }TWIInfoStruct; -TWIInfoStruct TWIInfo; - - -// TWI Status Codes -#define TWI_START_SENT 0x08 // Start sent -#define TWI_REP_START_SENT 0x10 // Repeated Start sent -// Master Transmitter Mode -#define TWI_MT_SLAW_ACK 0x18 // SLA+W sent and ACK received -#define TWI_MT_SLAW_NACK 0x20 // SLA+W sent and NACK received -#define TWI_MT_DATA_ACK 0x28 // DATA sent and ACK received -#define TWI_MT_DATA_NACK 0x30 // DATA sent and NACK received -// Master Receiver Mode -#define TWI_MR_SLAR_ACK 0x40 // SLA+R sent, ACK received -#define TWI_MR_SLAR_NACK 0x48 // SLA+R sent, NACK received -#define TWI_MR_DATA_ACK 0x50 // Data received, ACK returned -#define TWI_MR_DATA_NACK 0x58 // Data received, NACK returned - -// Miscellaneous States -#define TWI_LOST_ARBIT 0x38 // Arbitration has been lost -#define TWI_NO_RELEVANT_INFO 0xF8 // No relevant information available -#define TWI_ILLEGAL_START_STOP 0x00 // Illegal START or STOP condition has been detected -#define TWI_SUCCESS 0xFF // Successful transfer, this state is impossible from TWSR as bit2 is 0 and read only - - -#define TWISendStart() (TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN)|(1<<TWIE)) // Send the START signal, enable interrupts and TWI, clear TWINT flag to resume transfer. -#define TWISendStop() (TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN)|(1<<TWIE)) // Send the STOP signal, enable interrupts and TWI, clear TWINT flag. -#define TWISendTransmit() (TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWIE)) // Used to resume a transfer, clear TWINT and ensure that TWI and interrupts are enabled. -#define TWISendACK() (TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWIE)|(1<<TWEA)) // FOR MR mode. Resume a transfer, ensure that TWI and interrupts are enabled and respond with an ACK if the device is addressed as a slave or after it receives a byte. -#define TWISendNACK() (TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWIE)) // FOR MR mode. Resume a transfer, ensure that TWI and interrupts are enabled but DO NOT respond with an ACK if the device is addressed as a slave or after it receives a byte. - -// Function declarations -uint8_t TWITransmitData(void *const TXdata, uint8_t dataLen, uint8_t repStart); -void TWIInit(void); -uint8_t TWIReadData(uint8_t TWIaddr, uint8_t bytesToRead, uint8_t repStart); -uint8_t isTWIReady(void); - -#endif // TWICOMMS_H_
\ No newline at end of file diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c new file mode 100755 index 0000000000..f4a4bb7b0b --- /dev/null +++ b/drivers/avr/i2c_master.c @@ -0,0 +1,149 @@ +/* Library made by: g4lvanix + * Github repository: https://github.com/g4lvanix/I2C-master-lib + */ + +#include <avr/io.h> +#include <util/twi.h> + +#include "i2c_master.h" + +#define F_SCL 400000UL // SCL frequency +#define Prescaler 1 +#define TWBR_val ((((F_CPU / F_SCL) / Prescaler) - 16 ) / 2) + +void i2c_init(void) +{ + TWBR = (uint8_t)TWBR_val; +} + +uint8_t i2c_start(uint8_t address) +{ + // reset TWI control register + TWCR = 0; + // transmit START condition + TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN); + // wait for end of transmission + while( !(TWCR & (1<<TWINT)) ); + + // check if the start condition was successfully transmitted + if((TWSR & 0xF8) != TW_START){ return 1; } + + // load slave address into data register + TWDR = address; + // start transmission of address + TWCR = (1<<TWINT) | (1<<TWEN); + // wait for end of transmission + while( !(TWCR & (1<<TWINT)) ); + + // check if the device has acknowledged the READ / WRITE mode + uint8_t twst = TW_STATUS & 0xF8; + if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1; + + return 0; +} + +uint8_t i2c_write(uint8_t data) +{ + // load data into data register + TWDR = data; + // start transmission of data + TWCR = (1<<TWINT) | (1<<TWEN); + // wait for end of transmission + while( !(TWCR & (1<<TWINT)) ); + + if( (TWSR & 0xF8) != TW_MT_DATA_ACK ){ return 1; } + + return 0; +} + +uint8_t i2c_read_ack(void) +{ + + // start TWI module and acknowledge data after reception + TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA); + // wait for end of transmission + while( !(TWCR & (1<<TWINT)) ); + // return received data from TWDR + return TWDR; +} + +uint8_t i2c_read_nack(void) +{ + + // start receiving without acknowledging reception + TWCR = (1<<TWINT) | (1<<TWEN); + // wait for end of transmission + while( !(TWCR & (1<<TWINT)) ); + // return received data from TWDR + return TWDR; +} + +uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length) +{ + if (i2c_start(address | I2C_WRITE)) return 1; + + for (uint16_t i = 0; i < length; i++) + { + if (i2c_write(data[i])) return 1; + } + + i2c_stop(); + + return 0; +} + +uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length) +{ + if (i2c_start(address | I2C_READ)) return 1; + + for (uint16_t i = 0; i < (length-1); i++) + { + data[i] = i2c_read_ack(); + } + data[(length-1)] = i2c_read_nack(); + + i2c_stop(); + + return 0; +} + +uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length) +{ + if (i2c_start(devaddr | 0x00)) return 1; + + i2c_write(regaddr); + + for (uint16_t i = 0; i < length; i++) + { + if (i2c_write(data[i])) return 1; + } + + i2c_stop(); + + return 0; +} + +uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length) +{ + if (i2c_start(devaddr)) return 1; + + i2c_write(regaddr); + + if (i2c_start(devaddr | 0x01)) return 1; + + for (uint16_t i = 0; i < (length-1); i++) + { + data[i] = i2c_read_ack(); + } + data[(length-1)] = i2c_read_nack(); + + i2c_stop(); + + return 0; +} + +void i2c_stop(void) +{ + // transmit STOP condition + TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO); +} diff --git a/drivers/avr/i2c_master.h b/drivers/avr/i2c_master.h new file mode 100755 index 0000000000..2479d28d52 --- /dev/null +++ b/drivers/avr/i2c_master.h @@ -0,0 +1,22 @@ +/* Library made by: g4lvanix + * Github repository: https://github.com/g4lvanix/I2C-master-lib + */ + +#ifndef I2C_MASTER_H +#define I2C_MASTER_H + +#define I2C_READ 0x01 +#define I2C_WRITE 0x00 + +void i2c_init(void); +uint8_t i2c_start(uint8_t address); +uint8_t i2c_write(uint8_t data); +uint8_t i2c_read_ack(void); +uint8_t i2c_read_nack(void); +uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length); +uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length); +uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length); +uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length); +void i2c_stop(void); + +#endif // I2C_MASTER_H diff --git a/drivers/avr/is31fl3731.c b/drivers/avr/is31fl3731.c index e5941cf41e..c7a99e3a3d 100644 --- a/drivers/avr/is31fl3731.c +++ b/drivers/avr/is31fl3731.c @@ -20,7 +20,7 @@ #include <avr/io.h> #include <util/delay.h> #include <string.h> -#include "TWIlib.h" +#include "i2c_master.h" #include "progmem.h" // This is a 7-bit address, that gets left-shifted and bit 0 @@ -50,7 +50,7 @@ #define ISSI_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine' // Transfer buffer for TWITransmitData() -uint8_t g_twi_transfer_buffer[TXMAXBUFLEN]; +uint8_t g_twi_transfer_buffer[20]; // These buffers match the IS31FL3731 PWM registers 0x24-0xB3. // Storing them like this is optimal for I2C transfers to the registers. @@ -80,17 +80,11 @@ bool g_led_control_registers_update_required = false; void IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data ) { - g_twi_transfer_buffer[0] = (addr << 1) | 0x00; - g_twi_transfer_buffer[1] = reg; - g_twi_transfer_buffer[2] = data; - - // Set the error code to have no relevant information - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - // Continuously attempt to transmit data until a successful transmission occurs - //while ( TWIInfo.errorCode != 0xFF ) - //{ - TWITransmitData( g_twi_transfer_buffer, 3, 0 ); - //} + g_twi_transfer_buffer[0] = reg; + g_twi_transfer_buffer[1] = data; + + //Transmit data until succesful + while(i2c_transmit(addr << 1, g_twi_transfer_buffer,2) != 0); } void IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer ) @@ -100,29 +94,21 @@ void IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer ) // transmit PWM registers in 9 transfers of 16 bytes // g_twi_transfer_buffer[] is 20 bytes - // set the I2C address - g_twi_transfer_buffer[0] = (addr << 1) | 0x00; - // iterate over the pwm_buffer contents at 16 byte intervals for ( int i = 0; i < 144; i += 16 ) { // set the first register, e.g. 0x24, 0x34, 0x44, etc. - g_twi_transfer_buffer[1] = 0x24 + i; + g_twi_transfer_buffer[0] = 0x24 + i; // copy the data from i to i+15 // device will auto-increment register for data after the first byte // thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer for ( int j = 0; j < 16; j++ ) { - g_twi_transfer_buffer[2 + j] = pwm_buffer[i + j]; + g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j]; } - // Set the error code to have no relevant information - TWIInfo.errorCode = TWI_NO_RELEVANT_INFO; - // Continuously attempt to transmit data until a successful transmission occurs - while ( TWIInfo.errorCode != 0xFF ) - { - TWITransmitData( g_twi_transfer_buffer, 16 + 2, 0 ); - } + //Transmit buffer until succesful + while(i2c_transmit(addr << 1, g_twi_transfer_buffer,17) != 0); } } |