[第三期空气质量分析仪]第1周作业。

发布于 2019-10-17 23:13:12 浏览：1026 订阅该版

* 本帖最后由 Carry 于 2019-10-17 23:29 编辑 *

1，制作bsp，直接看官方教程[点击这里](https://github.com/RT-Thread/rt-thread/blob/master/bsp/stm32/docs/STM32%E7%B3%BB%E5%88%97BSP%E5%88%B6%E4%BD%9C%E6%95%99%E7%A8%8B.md)讲的非常清楚了。
2，LED闪烁代码：```#include "led_alert.h"

void led_alert_init(rt_base_t pin) 
{   
    rt_pin_mode(pin, PIN_MODE_OUTPUT);
    led_alert_off(pin);

}

void led_alert_on(rt_base_t pin)
{
 rt_kprintf("turn on led! ");
 rt_pin_write(pin,PIN_LOW);
}

void led_alert_off(rt_base_t pin)
{
 rt_kprintf("turn off led! ");
 rt_pin_write(pin,PIN_HIGH);
}

void led_on(void)
{
    rt_pin_write(8,PIN_LOW);
}

void alert_5hz_blink(rt_base_t pin)
{
    while(1)
    {
        led_alert_on(pin);
        rt_thread_mdelay(100);
        led_alert_off(pin);
        rt_thread_mdelay(100);
    }
}```
3，按键代码：```#include "key.h"

rt_base_t p_led1 = RT_NULL ;
rt_base_t p_key1 = RT_NULL ;

void key_callback1(void *args)
{

while(rt_pin_read(p_key1) == PIN_LOW)
 {
 rt_pin_write(p_led1, PIN_LOW);
 rt_kprintf("turn on led! ");
 }
 rt_pin_write(p_led1, PIN_HIGH);
 rt_kprintf("turn off led! ");
}

void key_init(rt_base_t key, rt_base_t led) 
{
 p_led1 = led;
 p_key1 = key;
 rt_pin_mode(p_led1, PIN_MODE_OUTPUT);
 rt_pin_write(p_led1,PIN_HIGH);
 /* 按键pin1引脚为输入模式 */
 rt_pin_mode(key, PIN_MODE_INPUT_PULLUP);
 /* 绑定中断，下降沿模式，回调函数名为key_callback */
 if(rt_pin_attach_irq(key, PIN_IRQ_MODE_FALLING , key_callback1, RT_NULL) != RT_EOK) rt_kprintf("irq failed ");
 /* 使能中断 */
 rt_pin_irq_enable(key, PIN_IRQ_ENABLE); 
}
```
4，温湿度计代码：```省略，由于我用的是DHT22；官方已经有人pr了DHT11的软件包了，于是用menuconfig导入再改一改引脚就可以了。```5，主函数：只要设置好LED的引脚、按键引脚和dht11_sample.c里设置DHT22的引脚就可以直接实现三个功能了。```#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include "led_alert.h"
#include "key.h"
#include "sensor_dallas_dht11.h"

#define LED_ALERT_PIN    GET_PIN(A, 8)
#define KEY_PIN          GET_PIN(A, 15)

int main(void)
{
    
//    led_alert_init(LED_ALERT_PIN);
    key_init(KEY_PIN,LED_ALERT_PIN);

alert_5hz_blink(LED_ALERT_PIN);

return RT_EOK;
}
```6，顺带一提，很多人不知道CubeMX到底要配置哪些外设，比如要使用I2C读温湿度的时候，想去用CubeMX初始化引脚，其实RTT不需要。对于类似疑问可以看这个文档，官方讲的很详细了。[点击查看](https://github.com/RT-Thread/rt-thread/blob/master/bsp/stm32/docs/STM32%E7%B3%BB%E5%88%97%E5%A4%96%E8%AE%BE%E9%A9%B1%E5%8A%A8%E6%B7%BB%E5%8A%A0%E6%8C%87%E5%8D%97.md)