Can I use the blocking API in RTOS's tasks?

[Junde]

Hi there,

I have an IIC sensor connected to the MCU. And I read the sensor data at 50Hz.

However, there are sometimes some IIC communication errors present with HAL_I2C_ERROR_TIMEOUT.

My project is based on FreeRTOS with 4 Tasks, the sensor data collection task is one of the tasks, and the priority of this one isn't the highest.

I try to read the sensor data by the blocking API "HAL_I2C_Master_Transmit()" and "HAL_I2C_Master_Receive()".

I want to know if is there any possibility that the HAL_I2C_ERROR_TIMEOUT is caused by the blocking API in the sensor data collection task being interrupted by higher-priority tasks.

If yes, how to modify the code? Change to "HAL_I2C_Master_Transmit_IT()" and "HAL_I2C_Master_Receive_IT()" is OK?

(Because the frequency of the error is very low, it's not easy to position the root reason by test.)

(And can't include "HAL_I2C_Master_Transmit()" and "HAL_I2C_Master_Receive()" in "taskENTER_CRITICAL()" and "taskExit_CRITICAL()" to keep others task's realtime)

Thanks for your help!

[Junde]

if you want use "HAL_I2C_Master_Transmit_IT()" and "HAL_I2C_Master_Receive_IT()", you need set the macro "USE_HAL_I2C_REGISTER_CALLBACKS"(in stm32g4xx_hal_conf.h) to 1.

And rewrite the callback function that you need. (the callback function lists can refer to HAL_I2C_Init() function)

Of course, you need to enable the IIC interrupt.