diff --git a/firmware/target/arm/as3525/ascodec-as3525.c b/firmware/target/arm/as3525/ascodec-as3525.c index 43a982f454..b9790217aa 100644 --- a/firmware/target/arm/as3525/ascodec-as3525.c +++ b/firmware/target/arm/as3525/ascodec-as3525.c @@ -27,7 +27,14 @@ I2C register description: * I2C2_CNTRL needs to be set to 0x51 for transfers to work at all. - bit 1 indicates direction of transfer (0 = write, 1 = read) + bit 0: ? possibly related to using ACKs during transfers + bit 1: direction of transfer (0 = write, 1 = read) + bit 2: use 2-byte slave address + * I2C2_IMR, I2C2_RIS, I2C2_MIS, I2C2_INT_CLR interrupt bits: + bit 2: byte read interrupt + bit 3: byte write interrupt + bit 4: ? possibly some kind of error status + bit 7: ACK error * I2C2_SR (status register) indicates in bit 0 if a transfer is busy. * I2C2_SLAD0 contains the i2c slave address to read from / write to. * I2C2_CPSR0/1 is the divider from the peripheral clock to the i2c clock.