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| author | MechMerlin <30334081+mechmerlin@users.noreply.github.com> | 2019-04-06 17:30:48 -0700 |
|---|---|---|
| committer | Drashna Jaelre <drashna@live.com> | 2019-04-06 17:30:48 -0700 |
| commit | 410984486b0a5c61174c6e4e5a3570f1b09f97dc (patch) | |
| tree | c3a5773e94e84a1bf818a9e1e295035b710fb41a /drivers | |
| parent | 2ffa4798a43682a73598c0b43d46abcca7cd6e83 (diff) | |
| download | qmk_firmware-410984486b0a5c61174c6e4e5a3570f1b09f97dc.tar.gz qmk_firmware-410984486b0a5c61174c6e4e5a3570f1b09f97dc.zip | |
i2c_init update to work with atmega32a boards (#5562)
* On i2c_init, enable two wire interface, twi interrupt, and slave
address ACK along with pull up resistors.
* thanks to some testing by drashna, we know that setting TWI doesn't work for all boards. Putting the new code into an ifdef block
Diffstat (limited to 'drivers')
| -rwxr-xr-x | drivers/avr/i2c_master.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c index 0db949db4a..ba6d0d1586 100755 --- a/drivers/avr/i2c_master.c +++ b/drivers/avr/i2c_master.c @@ -18,6 +18,18 @@ void i2c_init(void) { TWSR = 0; /* no prescaler */ TWBR = (uint8_t)TWBR_val; + + #ifdef __AVR_ATmega32A__ + // set pull-up resistors on I2C bus pins + PORTC |= 0b11; + + // enable TWI (two-wire interface) + TWCR |= (1 << TWEN); + + // enable TWI interrupt and slave address ACK + TWCR |= (1 << TWIE); + TWCR |= (1 << TWEA); + #endif } i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { |