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check TWWC (Write Collision Flag) bit after setting TWDR 

as suggested by @earlyprogrammer in #2173, to ensure TWDR value is set
if there is a write collision
This commit is contained in:
Sandeep Mistry 2015-08-28 10:25:56 -04:00 committed by Cristian Maglie
parent 48ff3a10ad
commit c71f5e9f88
1 changed files with 6 additions and 2 deletions
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8
hardware/arduino/avr/libraries/Wire/utility/twi.c
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@ -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
@ -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