hard20 pts · first answer countsmicrocontrollersinterruptsi2c

Timeouts fail in HAL callbacks

An STM32 HAL I2C call with a 100 ms timeout is made from inside a UART receive callback (an ISR). If the I2C device does not answer, the system hangs forever. Why?

A.HAL I2C timeouts are counted in seconds, not in millisecondsB.The timeout counts SysTick ticks, which cannot advance inside this ISRC.The UART callback turns the I2C peripheral off while it runsD.HAL timeouts only work in debug builds, not in release builds

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Timeouts fail in HAL callbacks

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