gadget-tester/led.c

/* 
 * (c) danielinux 2019
 * GPLv.2
 *
 * See LICENSE for details
 */
#include <stdint.h>
#include "system.h"
#include "led.h"

void led_setup(uint32_t led)
{
    uint32_t reg;
    AHB1_CLOCK_ER |= GPIOA_AHB1_CLOCK_ER;
    reg = GPIOA_MODE & ~ (0x03 << (led * 2));
    GPIOA_MODE = reg | (1 << (led * 2));
    reg = GPIOA_PUPD & (0x03 <<  (led * 2));
    GPIOA_PUPD = reg | (0x02 << (led * 2));
    led_off(led);
}

void pio_on(uint32_t pio)
{
    GPIOA_BSRR |= (1 << pio);
}

void pio_off(uint32_t pio)
{
    GPIOA_BSRR |= (1 << (pio + 16));
}

void pio_toggle(uint32_t pio)
{
    uint32_t reg;
    reg = GPIOA_ODR;
    if ((reg & (1 << pio)) == (1 << pio))
        pio_off(pio);
    else
        pio_on(pio);
}