The answer to this question here
Libopencm3 interrupt table on STM32F4
explains the whole mechanism nicely but what I get is whole vector table filled with blocking handlers.
I know that because I see it in debugger (apart from the whole thing not working): disassembly screenshot showing vector table.
It is as though linker simply ignores my nicely defined interrupt handler function(s), e.g.:
void sys_tick_handler(void)
{
...
}
void tim1_up_isr(void)
{
...
}
I am using EmBitz IDE and have followed this tutorial here to get libopencm3 to work (and it does work except for this issue).
I have checked the function names n-fold and have tried several online examples including those from the libopencm3-examples project.
Everything compiles without a glitch and loads into the target board (STM32F103C8) and runs fine - except no ISRs get invoked (I do get interrupt(s) but they get stuck in blocking handlers).
Does anyone have an idea why is this happening?
It looks like linking with standard vector table (from ST's SPL or HAL).
To check this, try to rename your sys_tick_handler() to SysTick_Handler() and
tim1_up_isr() to TIM1_UP_IRQHandler().
If it works, find file with this SysTick_Handler and TIM1_UP_IRQHandler (I think, that will be startup*.s) and delete it from your project.