diff options
| author | Sandeep Mistry <s.mistry@arduino.cc> | 2015-08-28 10:25:56 -0400 |
|---|---|---|
| committer | Cristian Maglie <c.maglie@arduino.cc> | 2015-10-22 16:33:00 +0200 |
| commit | 02dcc6ec74469523f2dc5502b1900bdf927ee1a3 (patch) | |
| tree | 32218868cb253d61532391d5f58c6d8b2ef92b41 /libraries/Wire/utility | |
| parent | 48bcef5a15f1b17aee877bdb8cf77c6b45faaa6e (diff) | |
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
Diffstat (limited to 'libraries/Wire/utility')
| -rw-r--r-- | libraries/Wire/utility/twi.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/libraries/Wire/utility/twi.c b/libraries/Wire/utility/twi.c index 9fb87f1..2af0597 100644 --- a/libraries/Wire/utility/twi.c +++ b/libraries/Wire/utility/twi.c @@ -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 |