Posted on January 20, 2018 at 01:48
hi there,
I am debugging an issue on the M4 where the SR2 hal busy bit never clears after a write transaction. The slave device asserts clock stretching but releases the clock.
with some debug added to the hal code, we see the following:
/vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5265: I2C_WaitOnFlagUntilTimeout SR2
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5272: I2C_WaitOnFlagUntilTimeout start: flag 100002 SR2 0
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5263: I2C_WaitOnFlagUntilTimeout SR1
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5270: I2C_WaitOnFlagUntilTimeout start: flag 10001 SR1 1
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:725: HAL_I2C_Master_Receive: HAL_I2C_STATE_READY
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5265: I2C_WaitOnFlagUntilTimeout SR2
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5272: I2C_WaitOnFlagUntilTimeout start: flag 100002 SR2 2
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5281: I2C_WaitOnFlagUntilTimeout poll: flag 100002 SR2 2
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:5292: I2C_WaitOnFlagUntilTimeout to: flag 100002 SR1 0 SR2 2
./vendor/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c:730: HAL_I2C_Master_Receive: HAL_BUSY, start = 42211, end = 42274
