RT-Thread 16. 软件定时器实现按键检测

1. 代码

//main.c

#include <rthw.h>
#include <stdio.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "drv_gpio.h"
#include "gd32f3x0.h"

/* defined the LED2 pin: PC6 */
#define LED1_PIN GET_PIN(B, 1)
#define LED2_PIN GET_PIN(B, 2)


#define delay_ms(x)   rt_thread_mdelay(x)

#define RT_USR1_THREAD_PRIO        6
#define USR1_THREAD_NAME          "usr1"
static struct rt_thread usr1_thread;
static rt_uint8_t usr1_thread_stack[500];


void rt_thread_usr1_entry(void *parameter)
{
    /* set LED2 pin mode to output */
    rt_pin_mode(LED2_PIN, PIN_MODE_OUTPUT);
    while (1)
    {
        rt_pin_write(LED2_PIN, PIN_HIGH);
        rt_thread_mdelay(2000);
        rt_pin_write(LED2_PIN, PIN_LOW);
        rt_thread_mdelay(3000);
    } 
}

void keyscan_init(void);


int main(void)
{
  
    keyscan_init();
  
    rt_thread_init(&usr1_thread,
                 USR1_THREAD_NAME,
                 rt_thread_usr1_entry,
                 RT_NULL,
                 &usr1_thread_stack[0],
                 sizeof(usr1_thread_stack),
                 RT_USR1_THREAD_PRIO,
                 20);
    rt_thread_startup(&usr1_thread);
  
    /* set LED1 pin mode to output */
    rt_pin_mode(LED1_PIN, PIN_MODE_OUTPUT);

    while (1)
    {
        rt_pin_write(LED1_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED1_PIN, PIN_LOW);
        rt_thread_mdelay(600);
    }
}

//usrtimer.c

#include <rtthread.h>
#include <rtdevice.h>
#include "drv_gpio.h"


/* 定时器的控制块 */
static struct rt_timer timer1;
static struct rt_timer timer2;
static struct rt_timer timer3;
static int cnt = 0;

#define KEY1_PIN GET_PIN(C, 11)

static uint8_t keyVal = 0;


/* 定时器 1 超时函数 */
static void timeout1(void* parameter)
{
    rt_kprintf("periodic timer is timeout\n");
    /* 运行 10 次 */
    if (cnt++>= 9)
    {
        rt_timer_stop(&timer1);
    }
}

/* 定时器 2 超时函数 */
static void timeout2(void* parameter)
{
    rt_kprintf("one shot timer is timeout\n");
}

static void keyscan(void* parameter)
{
  static uint8_t i = 0;
  uint8_t val;
  
  val = rt_pin_read(KEY1_PIN);
  if(val == 0)
  {
    if(i < 200)
    {
      i ++;
    }
  }
  else
  {
    if(i >= 2)
    {
      keyVal = 1;
      rt_kprintf("key press val is %d\n",keyVal);
      keyVal = 0;
    }
    i = 0;
  }
}

int timer_static_sample(void)
{
    /* 初始化定时器 */
    rt_timer_init(&timer1, 
                    "timer1",  /* 定时器名字是 timer1 */
                    timeout1, /* 超时时回调的处理函数 */
                    RT_NULL, /* 超时函数的入口参数 */
                    100, /* 定时长度，以 OS Tick 为单位，即 10 个 OS Tick */
                    RT_TIMER_FLAG_PERIODIC); /* 周期性定时器 */
    rt_timer_init(&timer2, 
                    "timer2",   /* 定时器名字是 timer2 */
                    timeout2, /* 超时时回调的处理函数 */
                    RT_NULL, /* 超时函数的入口参数 */
                    300, /* 定时长度为 30 个 OS Tick */
                    RT_TIMER_FLAG_ONE_SHOT); /* 单次定时器 */

    /* 启动定时器 */
    rt_timer_start(&timer1);
    rt_timer_start(&timer2);
    return 0;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(timer_static_sample, timer_static sample);

void keyscan_init(void)
{
    rt_pin_mode(KEY1_PIN, PIN_MODE_INPUT);
    rt_timer_init(&timer3, 
                    "timerKeyscan",   /* 定时器名字是 timer2 */
                    keyscan, /* 超时时回调的处理函数 */
                    RT_NULL, /* 超时函数的入口参数 */
                    5, /* 定时长度为 5 个 OS Tick */
                    RT_TIMER_FLAG_PERIODIC); /* 单次定时器 */  

    rt_timer_start(&timer3);
}

2.效果

按下按键1，串口输出