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https://github.com/DCC-EX/CommandStation-EX.git
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Revert "I2CManager_Mega4809.h - allow other I2C clock speeds."
This reverts commit 682c47f7dd
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This commit is contained in:
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e8e00f69d6
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a3d4255fee
@ -1,5 +1,5 @@
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/*
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/*
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* © 2023, Neil McKechnie. All rights reserved.
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* © 2021, Neil McKechnie. All rights reserved.
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*
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*
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* This file is part of CommandStation-EX
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* This file is part of CommandStation-EX
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*
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*
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@ -28,21 +28,21 @@
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***************************************************************************/
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***************************************************************************/
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void I2CManagerClass::I2C_setClock(unsigned long i2cClockSpeed) {
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void I2CManagerClass::I2C_setClock(unsigned long i2cClockSpeed) {
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uint16_t t_rise;
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uint16_t t_rise;
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if (i2cClockSpeed < 200000)
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if (i2cClockSpeed < 200000) {
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i2cClockSpeed = 100000;
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t_rise = 1000;
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t_rise = 1000;
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else if (i2cClockSpeed < 800000)
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} else if (i2cClockSpeed < 800000) {
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i2cClockSpeed = 400000;
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t_rise = 300;
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t_rise = 300;
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else
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} else if (i2cClockSpeed < 1200000) {
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i2cClockSpeed = 1000000;
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t_rise = 120;
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t_rise = 120;
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} else {
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if (t_rise == 120)
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i2cClockSpeed = 100000;
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TWI0.CTRLA |= TWI_FMPEN_bm;
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t_rise = 1000;
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else
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}
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TWI0.CTRLA &= ~TWI_FMPEN_bm;
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uint32_t baud = (F_CPU_CORRECTED / i2cClockSpeed - F_CPU_CORRECTED / 1000 / 1000
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uint32_t baud = (F_CPU_CORRECTED / i2cClockSpeed - F_CPU_CORRECTED / 1000 / 1000
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* t_rise / 1000 - 10) / 2;
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* t_rise / 1000 - 10) / 2;
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if (baud > 255) baud = 255; // ~30kHz
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TWI0.MBAUD = (uint8_t)baud;
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TWI0.MBAUD = (uint8_t)baud;
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}
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}
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@ -54,13 +54,13 @@ void I2CManagerClass::I2C_init()
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pinMode(PIN_WIRE_SDA, INPUT_PULLUP);
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pinMode(PIN_WIRE_SDA, INPUT_PULLUP);
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pinMode(PIN_WIRE_SCL, INPUT_PULLUP);
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pinMode(PIN_WIRE_SCL, INPUT_PULLUP);
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PORTMUX.TWISPIROUTEA |= TWI_MUX;
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PORTMUX.TWISPIROUTEA |= TWI_MUX;
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I2C_setClock(I2C_FREQ);
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#if defined(I2C_USE_INTERRUPTS)
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#if defined(I2C_USE_INTERRUPTS)
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TWI0.MCTRLA = TWI_RIEN_bm | TWI_WIEN_bm | TWI_ENABLE_bm;
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TWI0.MCTRLA = TWI_RIEN_bm | TWI_WIEN_bm | TWI_ENABLE_bm;
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#else
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#else
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TWI0.MCTRLA = TWI_ENABLE_bm;
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TWI0.MCTRLA = TWI_ENABLE_bm;
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#endif
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#endif
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I2C_setClock(I2C_FREQ);
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TWI0.MSTATUS = TWI_BUSSTATE_IDLE_gc;
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TWI0.MSTATUS = TWI_BUSSTATE_IDLE_gc;
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}
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}
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@ -70,8 +70,6 @@ void I2CManagerClass::I2C_init()
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void I2CManagerClass::I2C_sendStart() {
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void I2CManagerClass::I2C_sendStart() {
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bytesToSend = currentRequest->writeLen;
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bytesToSend = currentRequest->writeLen;
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bytesToReceive = currentRequest->readLen;
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bytesToReceive = currentRequest->readLen;
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txCount = 0;
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rxCount = 0;
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// If anything to send, initiate write. Otherwise initiate read.
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// If anything to send, initiate write. Otherwise initiate read.
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if (operation == OPERATION_READ || ((operation == OPERATION_REQUEST) && !bytesToSend))
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if (operation == OPERATION_READ || ((operation == OPERATION_REQUEST) && !bytesToSend))
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@ -91,10 +89,7 @@ void I2CManagerClass::I2C_sendStop() {
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* Close I2C down
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* Close I2C down
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***************************************************************************/
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***************************************************************************/
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void I2CManagerClass::I2C_close() {
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void I2CManagerClass::I2C_close() {
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I2C_sendStop();
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TWI0.MCTRLA &= ~(TWI_RIEN_bm | TWI_WIEN_bm | TWI_ENABLE_bm); // Switch off I2C
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TWI0.MSTATUS = TWI_BUSSTATE_UNKNOWN_gc;
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delayMicroseconds(10); // Wait for things to stabilise (hopefully)
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}
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}
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/***************************************************************************
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/***************************************************************************
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@ -119,9 +114,11 @@ void I2CManagerClass::I2C_handleInterrupt() {
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TWI0.MCTRLB = TWI_MCMD_STOP_gc;
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TWI0.MCTRLB = TWI_MCMD_STOP_gc;
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state = I2C_STATUS_NEGATIVE_ACKNOWLEDGE;
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state = I2C_STATUS_NEGATIVE_ACKNOWLEDGE;
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} else if (bytesToSend) {
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} else if (bytesToSend) {
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// Acked, so send next byte (don't need to use GETFLASH)
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// Acked, so send next byte
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txCount++;
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if (currentRequest->operation == OPERATION_SEND_P)
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TWI0.MDATA = *sendPointer++;
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TWI0.MDATA = GETFLASH(currentRequest->writeBuffer + (txCount++));
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else
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TWI0.MDATA = currentRequest->writeBuffer[txCount++];
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bytesToSend--;
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bytesToSend--;
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} else if (bytesToReceive) {
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} else if (bytesToReceive) {
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// Last sent byte acked and no more to send. Send repeated start, address and read bit.
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// Last sent byte acked and no more to send. Send repeated start, address and read bit.
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@ -134,10 +131,13 @@ void I2CManagerClass::I2C_handleInterrupt() {
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} else if (currentStatus & TWI_RIF_bm) {
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} else if (currentStatus & TWI_RIF_bm) {
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// Master read completed without errors
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// Master read completed without errors
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if (bytesToReceive) {
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if (bytesToReceive) {
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rxCount++;
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currentRequest->readBuffer[rxCount++] = TWI0.MDATA; // Store received byte
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*receivePointer++ = TWI0.MDATA; // Store received byte
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bytesToReceive--;
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bytesToReceive--;
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}
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} else {
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// Buffer full, issue nack/stop
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TWI0.MCTRLB = TWI_ACKACT_bm | TWI_MCMD_STOP_gc;
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state = I2C_STATUS_OK;
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}
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if (bytesToReceive) {
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if (bytesToReceive) {
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// More bytes to receive, issue ack and start another read
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// More bytes to receive, issue ack and start another read
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TWI0.MCTRLB = TWI_MCMD_RECVTRANS_gc;
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TWI0.MCTRLB = TWI_MCMD_RECVTRANS_gc;
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