Function gpio_get

bsp/loongson/ls1cdev/libraries/ls1c_gpio.c:181–212

* 读取指定gpio引脚的值 * @gpio gpio引脚，取值范围[0,127] * * 例: 读取gpio50引脚上的值 * gpio_level_t level; * level = gpio_get(50); */

 * level = gpio_get(50);
 */
unsigned int gpio_get(unsigned int gpio)
{
    volatile unsigned int *gpio_inx = NULL;        // GPIO_INx寄存器
    unsigned int port   = GPIO_GET_PORT(gpio);
    unsigned int pin    = GPIO_GET_PIN(gpio);

    // 获取寄存器地址
    switch (port)
    {
        case 0:
            gpio_inx = (volatile unsigned int *)LS1C_GPIO_IN0;
            break;

        case 1:
            gpio_inx = (volatile unsigned int *)LS1C_GPIO_IN1;
            break;

        case 2:
            gpio_inx = (volatile unsigned int *)LS1C_GPIO_IN2;
            break;

        case 3:
            gpio_inx = (volatile unsigned int *)LS1C_GPIO_IN3;
            break;

        default:        // 正常的流程不应该走到这里，直接返回
            return 0;
    }

    // 读取
    return reg_get_bit(gpio_inx, pin);
}


/**