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TDA4VM: I2C bus recovery function

Genius 13655 points
Part Number: TDA4VM

Hello Champs,


In the I2C driver of SDK7.3,  the I2C controller will recovery bus by generate 9 clocks on SCL when the I2C bus is abnormal(SDA signal is always low)

I2C driver:   ti/drv/i2c/src/v1/I2C_v1.c, recovery  interface:I2C_v1_recoverBus

 

I2C_v1_recoverBus is called When the I2C bus is idle, and 9 clock signals are generated, but SDA remains low

 

Why is the SDA signal change from high to low when recovery I2C bus. This will cause the recovery bus failed

Thanks
Regards
Shine