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Call the onReceive callback when a repeated start is received. #798

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Call the onReceive callback when a repeated start is received. #798

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48 changes: 28 additions & 20 deletions hardware/msp430/cores/msp430/twi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -922,6 +922,11 @@ uint16_t i2c_state_isr(void) // I2C Service
/* UCTR is automagically set by the USCI module upon a START condition. */
if (UCBxCTL1 & UCTR) {
/* Slave TX mode. */
if (twi_state == TWI_SRX) {
/* if we were in SRX mode and now enter STX mode then there was a repeated start */
/* Callback to user defined callback */
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
}
twi_state = TWI_STX;
/* Ready the tx buffer index for iteration. */
twi_txBufferIndex = 0;
Expand Down Expand Up @@ -1006,27 +1011,30 @@ uint16_t eusci_isr_handler(void)
break;
case USCI_I2C_UCSTTIFG: // USCI I2C Mode: UCSTTIFG
UCBxIFG &= ~UCSTTIFG;
if (twi_state == TWI_IDLE){
if (UCBxCTLW0 & UCTR){
twi_state = TWI_STX; // Slave Transmit mode
// ready the tx buffer index for iteration
twi_txBufferIndex = 0;
// set tx buffer length to be zero, to verify if user changes it
twi_txBufferLength = 0;
// request for txBuffer to be filled and length to be set
// note: user must call twi_transmit(bytes, length) to do this
twi_onSlaveTransmit();
// if they didn't change buffer & length, initialize it
if(0 == twi_txBufferLength){
twi_txBufferLength = 1;
twi_txBuffer[0] = 0x00;
}
} else {
twi_state = TWI_SRX; // Slave receive mode
// indicate that rx buffer can be overwritten and ack
twi_rxBufferIndex = 0;
if (UCB0CTLW0 & UCTR){
if (twi_state == TWI_SRX) {
/* if we were in SRX mode and now enter STX mode then there was a repeated start */
/* Callback to user defined callback */
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
}
}
twi_state = TWI_STX; // Slave Transmit mode
// ready the tx buffer index for iteration
twi_txBufferIndex = 0;
// set tx buffer length to be zero, to verify if user changes it
twi_txBufferLength = 0;
// request for txBuffer to be filled and length to be set
// note: user must call twi_transmit(bytes, length) to do this
twi_onSlaveTransmit();
// if they didn't change buffer & length, initialize it
if(0 == twi_txBufferLength){
twi_txBufferLength = 1;
twi_txBuffer[0] = 0x00;
}
} else {
twi_state = TWI_SRX; // Slave receive mode
// indicate that rx buffer can be overwritten and ack
twi_rxBufferIndex = 0;
}
break;
case USCI_I2C_UCSTPIFG: // USCI I2C Mode: UCSTPIFG
//UCBxIFG &= ~UCSTPIFG;
Expand Down