1. pin设备

#define LED_PIN	3int led(void)
{rt_uint8_t count;rt_pin_mode(LED_PIN, PIN_MODE_OUTPUT);  for(count = 0 ; count < 10 ;count++){       rt_pin_write(LED_PIN, PIN_HIGH);rt_kprintf("led on, count : %d %d\r\n", count, rt_pin_read(LED_PIN));rt_thread_mdelay(500);rt_pin_write(LED_PIN, PIN_LOW);rt_kprintf("led off %d\r\n", rt_pin_read(LED_PIN));rt_thread_mdelay(500);}return 0;
}
MSH_CMD_EXPORT(led, RT-Thread first led sample);

2. 普通I/O设备

#define LED_PIN	3int led(void)
{rt_uint8_t count;rt_device_t pin_dev;struct rt_device_pin_mode arg;struct rt_device_pin_status status;pin_dev = rt_device_find("pin");arg.pin = LED_PIN;arg.mode = PIN_MODE_OUTPUT;rt_device_control(pin_dev, RT_NULL, &arg);rt_device_open(pin_dev, 0);for(count = 0 ; count < 10 ;count++){status.pin = LED_PIN;status.status = PIN_HIGH;rt_device_write(pin_dev, 0, &status, sizeof(&status));rt_kprintf("led on, count : %d\r\n", count);rt_thread_mdelay(500);status.pin = LED_PIN;status.status = PIN_LOW;rt_device_write(pin_dev, 0, &status, sizeof(&status));rt_kprintf("led off\r\n");rt_thread_mdelay(500);}return 0;
}
MSH_CMD_EXPORT(led, RT-Thread first led sample);