Is this a HAL IIC bug?

[Junde]

Hi there,

I drove 4 SHT4x by STM32G473VE and used the HAL_I2C_Master_Transmit() and HAL_I2C_Master_Receive() to write and read the sensors.

Normally, everything is well.

However, if I

1. unplug the sensor;
2. replug the sensor again;(Not the sensor maybe can NOT work normally)
3. reset the MCU;

the program will probably run into  the following dead loop:

I don't know why this happened, and how I can recover from this error state.

Thank you!

[Saket_Om]

Hello @Junde 

Have you tried checking the device with the HAL_I2C_IsDeviceReady() API after unplugging and replugging it?

Could you provide the data transmission trace using the logic analyzer?

[Andrew Neil]

Previous discussion on recovering from problems on the I2C bus:

https://community.st.com/t5/stm32-mcus-embedded-software/hal-i2c-geterror-reporting-error-codes/m-p/677103/highlight/true#M47943