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improve STOP/START handling #20

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improve STOP/START handling #20

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6 changes: 4 additions & 2 deletions firmware/twi-slave.c
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Original file line number Diff line number Diff line change
Expand Up @@ -125,12 +125,14 @@ ISR(TWI_vect) {
break;

case TW_SR_STOP: // A STOP condition or repeated START condition has been received while still addressed as Slave
// Clear the condition immediately, so we're less likely to miss
// a START that immediately follows a STOP, and can still match
// our address
TWI_Start_Transceiver(1);
// Either way, treat it as end of transmission
if (TWI_Rx_Data_Callback) {
TWI_Rx_Data_Callback(TWI_buf, TWI_bufPtr);
}
// Release the bus and re-enable reception in un-addressed mode
TWI_Start_Transceiver(1);
break;

case TW_SR_DATA_NACK: // Previously addressed with own SLA+W; data has been received; NOT ACK has been returned
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