Call function from gdb at breakpoint?

Question

Hi, 
 Is it possible to call an arbitrary function at a breakpoint in gdb on the nRF52? I know you can with normal gdb, but I haven't been able to make it work with the cross ARM version. Thanks. 
 SDK13
PCA10040/nRF52832
GNU gdb (GNU Tools for ARM Embedded Processors 6-2017-q1-update)
Eclipse
OSX

Håkon Alseth · Accepted Answer

Hi,

I just tested this with gcc-arm-none-eabi-6_2-2016q4 on the blinky example. I added this function which blinks with 1 sec delay instead of 500 ms:

void test_function(void)
{
    for (int i = 0; i < LEDS_NUMBER; i++)
    {
        bsp_board_led_invert(i);
        nrf_delay_ms(1000);
    }    
}

Remember to run this function once before entering while(1) loop to ensure that gcc does not dump it.

arm-none-eabi-gdb _build/*.out 
(gdb) target remote :2331 
(gdb) load 
(gdb) mon reset 
(gdb) c 
<break somewhere in your code once the 500 ms routine starts, using CTRL+C> 
(gdb) call test_function()

It is very important that you add the parentheses when calling "call func()". Once it is finished calling the function, it will go back to a halted state.

Happy debugging! Cheers, Håkon

Call function from gdb at breakpoint?

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