Posted on August 08, 2017 at 18:48
Hello Piotr!
1. your timer will never start counting because you put as period, (ARR) zero.
htim3.Init.Period = 0;
2. Inside your Timer callback function(if this finaly called), you zeroize the variable by
defining static int delay_us = 0; finaly after exit it has the value 0x
3 Other issue is that you put inside this callback
the
HAL_TIM_IRQHandler(..);
This is not correct because the callback function called from inside HAL_TIM_IRQHandler(..); !!
4. Inside your While(1) loop, you call sequentialy
HAL_UART_Transmit_IT(..) without checking for completion from the previous transmit This is a non blocking function. May be calling the blocking version is more suitable for your project
HAL_UART_Transmit(..)
In conclusion, you first take action to improove these imperfections in order to get a better focused picture to the posible problem.
It would help the community and you to post your .IOC file.
