On Fri, Jul 14, 2023 at 6:53 PM Tomas Vanek
<tom_...@users.sourceforge.net> wrote:
>
> On 14/07/2023 00:30, Tomas Vanek wrote:
>
>
> Unfortunately (if I'm not completely wrong guessing the mechanism of the
> errata) each rogue break also means that
> one semihosting operation gets skipped. So your test will keep running, time
> to time some semihosted output get lost.
>
> T
>
> Not really! The semihosting operation or any other BKPT is executed again
> after return from the interrupt!
>
> The code reliably replicating the issue on STM32F767 without semihosting is
> as simple as that:
Cool!
It could be interesting to check under Segger or other tools to
confirm they have some workaround and maybe try to figure out what the
workaround does; maybe they simply continue if the halt does not match
any set breakpoint.
Antonio
> #include "stm32f7xx_hal.h"
> int pendsv_cnt, loop_cnt;
>
> void PendSV_Handler(void)
> {
> pendsv_cnt++; }
> int main(void)
> {
> while (1) {
> SCB->ICSR |= SCB_ICSR_PENDSVSET_Msk; // you may insert 0..8 __NOP()
> instructions as a delay here // no issue observed with a delay longer than 8
> __NOP() instructions
> __BKPT(0); loop_cnt++; } }
> // empty SystemInit to keep STM startup_stm32f767xx.s happy
> void SystemInit(void)
> {
> }
> The code running under OpenOCD/gdb stops first in PendSV_Handler() and then
> correctly at __BKPT(0) location. OpenOCD setting cortex_m interrupt mask on
> suppresses interrupts and no surprise that rogue breaks in PendSV_Handler()
> disappear as well. T
