diff options
Diffstat (limited to 'src/fsm/i2c.h')
| -rw-r--r-- | src/fsm/i2c.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/src/fsm/i2c.h b/src/fsm/i2c.h index 2e2dbd3..109213b 100644 --- a/src/fsm/i2c.h +++ b/src/fsm/i2c.h @@ -30,11 +30,24 @@ /* Initialise I2C on the board for both the audio codec and the GPS receiver */ void i2c_init(); -/* Do an I2C write */ -void i2c_write(uint8_t device, const uint8_t *txbuf, int len); +/* Do an I2C write, return 1 on success, 0 on failure */ +int i2c_write(uint8_t device, const uint8_t *txbuf, int len); -/* Do an I2C write into rxbuf. Returns number of bytes received */ +/* Do an I2C read into rxbuf. + * Returns number of bytes received, or 0 in case of failure + */ int i2c_read(uint8_t device, uint8_t *rxbuf, int len); +/* Do an I2C write for the address, and then a read into rxbuf. + * Returns number of bytes received, or 0 in case of failure + */ +int i2c_read_from(uint8_t device, uint8_t address, uint8_t *rxbuf, int len); + +/* Start an I2C transaction, keeping exclusive access to I2C */ +void i2c_transaction_start(void); + +/* End an I2C transaction, unlocking the exclusive access to I2C */ +void i2c_transaction_end(void); + #endif // __I2C_H_ |