查看F1C的源代码

=== GPIO ===

<source lang=bash>
 leds {
             compatible = "gpio-leds";
             blue_led {
                     label = "licheepi:blue:usr";
                     gpios = <&pio 4 4 GPIO_ACTIVE_LOW>; /* PE4 */
             };
             green_led {
                     label = "licheepi:green:usr";
                     gpios = <&pio 4 5 GPIO_ACTIVE_LOW>; /* PE5 */
                     default-state = "on";
             };
             red_led {
                     label = "licheepi:red:usr";
                     gpios = <&pio 5 6 GPIO_ACTIVE_LOW>; /* PE6 */
             };
 };
</source>

命令行方式：
<source lang=bash>
$ cat gpio.sh
#!/bin/sh -e

if [ ! -e /sys/class/gpio/gpio$1 ]; then
    echo $1 > /sys/class/gpio/export
fi
echo out > /sys/class/gpio/gpio$1/direction
echo $2 > /sys/class/gpio/gpio$1/value

$ ./gpio.sh 105 1
</source>

<pre>
# A: 0
# B: 1
# C: 2
# D: 3
# E: 4
 * PB5 = 32*1 + 5 = 37
 * PC6= 32*2 + 6 = 70
 * PD9 = 32*3 + 9 = 105
</pre>

<source lang=cpp>
#include <linux/gpio.h>

/*
 * PB5 = 32*1 + 5
 * PC6= 32*2 + 6
 * PD9 = 32*3 + 9 = 105
*/
gpio_direction_output(105, 0);     // 设置 PD9 为输出状态, 默认输出低电平
gpio_set_value(105, 1);                // 高电平
gpio_set_value(105, 0);                // 低电平
</source>

<br>