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Diffstat (limited to 'keyboards/lfkeyboards/TWIlib.c')
-rw-r--r-- | keyboards/lfkeyboards/TWIlib.c | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/keyboards/lfkeyboards/TWIlib.c b/keyboards/lfkeyboards/TWIlib.c deleted file mode 100644 index abb12cc87a..0000000000 --- a/keyboards/lfkeyboards/TWIlib.c +++ /dev/null @@ -1,283 +0,0 @@ -/* - * TWIlib.c - * - * Created: 6/01/2014 10:41:33 PM - * Author: Chris Herring - */ - -#include <avr/io.h> -#include <avr/interrupt.h> -#include "TWIlib.h" -#include "util/delay.h" -#include "print.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 - { - if(TWIInfo.mode == Initializing){ - switch(TWIInfo.errorCode){ - case TWI_SUCCESS: - case TWI_NO_RELEVANT_INFO: - break; - case TWI_LOST_ARBIT: - case TWI_MT_DATA_NACK: - // Some kind of I2C error, reset and re-init - xprintf("I2C init error: %d\n", TWIInfo.errorCode); - TWCR = (1 << TWINT)|(1 << TWSTO); - TWIInit(); - break; - default: - xprintf("Other i2c init error: %d\n", TWIInfo.errorCode); - } - } - return 0; - } -} - - -void TWITransmitData(void *const TXdata, uint8_t dataLen, uint8_t repStart, uint8_t blocking) -{ - // Wait until ready - while (!isTWIReady()) {_delay_us(1);} - // Reset the I2C stuff - TWCR = (1 << TWINT)|(1 << TWSTO); - TWIInit(); - // Set repeated start mode - TWIInfo.repStart = repStart; - // Copy transmit info to global variables - TWITransmitBuffer = (uint8_t *)TXdata; - 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(); - } - if(blocking){ - // Wait until ready - while (!isTWIReady()){_delay_us(1);} - } -} - - -// 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, 0); - } - 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; - } - -} |