scttnlsn / avr-twi Goto Github PK

Thank you for showing me the way with this elegant interrupt-driven library.
It feels like it is how it was intended to be written by Atmel.

For curiosity: I took the base structure some modifications to fit my needs:

• I replaced the various twi_start() by enums like TWCR_START = _BV(TWINT) | _BV(TWEN) | _BV(TWIE) | _BV(TWSTA), and use TWCR = TWCR_START directly instead of calls to twi_start().
• I replaced the callback and internal buffer by writing directly to the buffer provided as argument. For the START condition, I have an extra transmission.firstbyte written to TWDR during case TW_START:/case TW_REP_START:.

My best regards, Josuah.

Hi, I'm puzzled with the twi_write()/twi_read().
Let at24c02 as the device, it has the device address (e.g. 0xA0) and word address (0~255).

If there are two at24c02 on the twi bus, the device address of the first one is 0xA0, and the second one is 0xA2. How to let the master distinguish them when using the twi_write()/twi_read()? And determine the word address? Because there is only one address as a parameter in the twi_write()/twi_read().
Best regards.