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Check TWWC (Write Collision Flag) bit after setting TWDR #3742

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Check TWWC (Write Collision Flag) bit after setting TWDR #3742

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8 changes: 6 additions & 2 deletions hardware/arduino/avr/libraries/Wire/utility/twi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -167,7 +167,9 @@ uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sen
// up. Also, don't enable the START interrupt. There may be one pending from the
// repeated start that we sent outselves, and that would really confuse things.
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
TWDR = twi_slarw;
do {
TWDR = twi_slarw;
} while(TWCR & _BV(TWWC));
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
}
else
Expand Down Expand Up @@ -247,7 +249,9 @@ uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait
// up. Also, don't enable the START interrupt. There may be one pending from the
// repeated start that we sent outselves, and that would really confuse things.
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
TWDR = twi_slarw;
do {
TWDR = twi_slarw;
} while(TWCR & _BV(TWWC));
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
}
else
Expand Down