#include
#include
#include
#include
#include //define O_WRONLY and O_RDONLY
// LED 引脚
#define SYSFS_GPIO_EXPORT "/sys/class/gpio/export"
#define SYSFS_GPIO_UNEXPORT "/sys/class/gpio/unexport"
#define SYSFS_GPIO_RST_PIN_VAL "440"
#define SYSFS_GPIO_RST_DIR "/sys/class/gpio/gpio440/direction"
#define SYSFS_GPIO_RST_DIR_VAL "OUT"
#define SYSFS_GPIO_RST_VAL "/sys/class/gpio/gpio440/value"
#define SYSFS_GPIO_RST_VAL_H "1"
#define SYSFS_GPIO_RST_VAL_L "0"
int main()
{
int fd;
int count = 30;
// 打开端口/sys/class/gpio# echo 440 > export
fd = open(SYSFS_GPIO_EXPORT, O_WRONLY);
if (fd == -1)
{
printf("ERR: export open error.\n");
return EXIT_FAILURE;
}
write(fd, SYSFS_GPIO_RST_PIN_VAL, sizeof(SYSFS_GPIO_RST_PIN_VAL));
close(fd);
// 设置端口方向/sys/class/gpio/gpio440# echo out > direction
fd = open(SYSFS_GPIO_RST_DIR, O_WRONLY);
if (fd == -1)
{
printf("ERR: direction open error.\n");
return EXIT_FAILURE;
}
write(fd, SYSFS_GPIO_RST_DIR_VAL, sizeof(SYSFS_GPIO_RST_DIR_VAL));
close(fd);
// 输出复位信号: 拉高>100ns
fd = open(SYSFS_GPIO_RST_VAL, O_RDWR);
if (fd == -1)
{
printf("ERR: gpio open error.\n");
return EXIT_FAILURE;
}
while (count)
{
count--;
printf("milk:%d\r\n",count);
write(fd, SYSFS_GPIO_RST_VAL_H, sizeof(SYSFS_GPIO_RST_VAL_H));
usleep(1000000);
write(fd, SYSFS_GPIO_RST_VAL_L, sizeof(SYSFS_GPIO_RST_VAL_L));
usleep(1000000);
}
close(fd);
// 打开端口/sys/class/gpio# echo 440 > unexport
fd = open(SYSFS_GPIO_UNEXPORT, O_WRONLY);
if (fd == -1)
{
printf("ERR: unexport open error.\n");
return EXIT_FAILURE;
}
write(fd, SYSFS_GPIO_RST_PIN_VAL, sizeof(SYSFS_GPIO_RST_PIN_VAL));
close(fd);
return 0;
}
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