main.c

#include <pico/stdlib.h>

unsigned* enablerregister = (void *) (SIO_BASE + SIO_GPIO_HI_OE_OFFSET);
unsigned* volatile outregister = (void *) (SIO_BASE + SIO_GPIO_HI_OUT_OFFSET);
unsigned* gpioregister = (void *) (IO_BANK0_BASE + IO_BANK0_GPIO25_CTRL_OFFSET );

int main() {
    
    *gpioregister = 5;
    *enablerregister = 0x01 << PICO_DEFAULT_LED_PIN;
    for(int i = 0; i< 10 ;i++){
        for(int j = 0; j <10000000000; j++){
            *outregister = 0x01 << PICO_DEFAULT_LED_PIN;
        }
        for(int j = 0; j <10000000000; j++){
            *outregister = 0x00;

        }
    }

    return 0;
}