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release TWI bus right after stop or repeated start is condition 

this resolves timing issues seen in #1477
This commit is contained in:
Sandeep Mistry 2015-08-27 10:57:20 -04:00 committed by Cristian Maglie
parent e8f7996e9a
commit 48bcef5a15
1 changed files with 2 additions and 2 deletions
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4
libraries/Wire/utility/twi.c
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@ -476,6 +476,8 @@ ISR(TWI_vect)
} }
break; break;
case TW_SR_STOP: // stop or repeated start condition received case TW_SR_STOP: // stop or repeated start condition received
// ack future responses and leave slave receiver state
twi_releaseBus();
// put a null char after data if there's room // put a null char after data if there's room
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){ if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
twi_rxBuffer[twi_rxBufferIndex] = '\0'; twi_rxBuffer[twi_rxBufferIndex] = '\0';
@ -484,8 +486,6 @@ ISR(TWI_vect)
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex); twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
// since we submit rx buffer to "wire" library, we can reset it // since we submit rx buffer to "wire" library, we can reset it
twi_rxBufferIndex = 0; twi_rxBufferIndex = 0;
// ack future responses and leave slave receiver state
twi_releaseBus();
break; break;
case TW_SR_DATA_NACK: // data received, returned nack case TW_SR_DATA_NACK: // data received, returned nack
case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack