testgpio.c

這是一個AT91開發版程式碼 對MCU有興趣可以研究

#include <unistd.h>

#include <stdio.h>

#include "at91gpio.h"

#define PC22   (1 << 22)

int main()
{
    //init port
    int state = 0;
    unsigned int mask = PC22;
    AT91S_PIO *pioc;

    pioc = pio_map(PIOC_BASE);

    pio_enable(pioc, mask);

    pio_disable_irq(pioc, mask);

    pio_disable_multiple_driver(pioc, mask);

    pio_disable_pull_ups(pioc, mask);

    pio_synchronous_data_output(pioc, mask);

    pio_output_enable(pioc, mask);

    while (1) {
        /* printf("GPIO state = %d\n", state); */
        pio_out(pioc, PC22, state);
        state = !state;
        usleep(1 * 1000 * 1000);

    }
}