STM32L4 - HAL_I2C_STATE_BUSY_RX issue

[wasp.lahis]

I'm having trouble with i2c communication. In my i2c bus, i have 4 boards (STM32L4 Sensortiles) and sometimes one of them blocks the bus and the others stop communicating consequently. When I reset that one that blocks the bus, all boards starting working again.

In my debugs, this bug happened when HAL_I2C_GetState(&hi2c3) returns HAL_I2C_STATE_BUSY_RX, even my others i2c functions HAL_I2C_Slave_Receive_IT and HAL_I2C_Slave_Transmit_IT returns HAL_OK:

Any ideas what I'm doing wrong? Thanks.

[T J]

I believe the problem with IIC being dodgy is the clock source and pin speed.

make sure your IIC clock source is above 2MHz and set the pin to very fast.

[prain]

HAL_I2C_STATE_BUSY_RX is a temporary state. It should return to idle state. step into code and check. Usually the transmit/receive complete interrupt resets the HAL to idle state.