RT-Thread-N32L40XCL-STB 开发板模块评测任务大挑战之测试GPIORT-Thread问答社区

N32L40XCL-STB 开发板模块评测任务大挑战之测试GPIO

发布于 2023-04-22 14:35:54 浏览：262 订阅该版

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## 1 测试环境
- 开发板：N32L40XCL-STB V1.0
- 开发环境：RT-Thread studio 2.2.6
- RT-Thread版本：4.0.2

## 2 硬件资源介绍
开发板上共有3个按键和3个LED如下图所示。
- GPIO输入输出测试：KEY1对应引脚设置为GPIO输入，控制LED1、LED2亮灭
- GPIO中断模式测试：KEY2对应引脚设置为下降沿触发，触发后打印KEY2!等若干字符
- LED3指示系统正常工作
![板载资源](https://oss-club.rt-thread.org/uploads/20230421/4d4753dd08e2f017bde0a0fbea15b5bf.png)

## 3 GPIO测试代码
关于工程创建等可参考其他人的文章，在applications文件夹中创建gpio_test.c文件并加入如下的测试代码
```c
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>

/* defined the LED1 pin: PA8 */
#define LED1_PIN GET_PIN(A, 8)
/* defined the LED2 pin: PB4 */
#define LED2_PIN GET_PIN(B, 4)

/* defined the KEY1 pin: PA4 */
#define KEY1_PIN GET_PIN(A, 4)
/* defined the KEY2 pin: PA5 */
#define KEY2_PIN GET_PIN(A, 5)

static uint8_t curr_st = 0;
static uint8_t next_st = 0;

static uint8_t led_st = 0;

static void key_led_thread_entry(void *parameter)
{
    while (1) {
        /* led status switch */
        if (rt_pin_read(KEY1_PIN) == PIN_LOW) {
            rt_thread_mdelay(20);
            if (rt_pin_read(KEY1_PIN) == PIN_LOW) {
                next_st = 1;
            } else {
                next_st = 0;
            }
        } else {
            next_st = 0;
        }

/* switch on/off the led */
        if ((curr_st == 0) && (next_st != 0)) {
            led_st = !led_st;
        } else {
            led_st = led_st;
        }
        curr_st = next_st;

if (led_st) {
            rt_pin_write(LED1_PIN, PIN_HIGH);
            rt_pin_write(LED2_PIN, PIN_LOW);
        } else {
            rt_pin_write(LED1_PIN, PIN_LOW);
            rt_pin_write(LED2_PIN, PIN_HIGH);
        }

rt_thread_mdelay(20);
    }
}

static void key2_callback(void *args)
{
    char *str = args;
    rt_kprintf(str);
}

int gpio_test(void)
{
    /* gpio input and output test */
    rt_pin_mode(KEY1_PIN, PIN_MODE_INPUT_PULLUP);

rt_pin_mode(LED1_PIN, PIN_MODE_OUTPUT);
    rt_pin_write(LED1_PIN, PIN_LOW);

rt_pin_mode(LED2_PIN, PIN_MODE_OUTPUT);
    rt_pin_write(LED2_PIN, PIN_HIGH);

rt_thread_t tid;
    tid = rt_thread_create("key_led", key_led_thread_entry, RT_NULL, 512, 10, 5);
    if (tid != RT_NULL) {
        rt_thread_startup(tid);
    } else {
        rt_kprintf("startup the thread failed!\n");
    }

/* gpio irq test */
    rt_pin_mode(KEY2_PIN, PIN_MODE_INPUT_PULLUP);
    rt_pin_attach_irq(KEY2_PIN, PIN_IRQ_MODE_FALLING, key2_callback, (void *)"KEY2!\n");
    rt_pin_irq_enable(KEY2_PIN, PIN_IRQ_ENABLE);
}
INIT_APP_EXPORT(gpio_test);
```
## 4 现象视频
[GPIO输入输出测试](https://club.rt-thread.org/file_download/925fb4ed56d781bd)