5 低功耗模式不能唤醒（外部中断）

发布于 2022-05-30 16:07:24 浏览：1167 订阅该版

使用的开发板为 正点原子的 STM32F429IGTx 阿波罗开发板，内核版本为 4.0.4，PM组件版本为 2.0。参考文章 https://blog.csdn.net/sinat_31039061/article/details/106356068 对低功耗管理相关内容进行移植，拷贝了 drv_pm.c、drv_pmhw_f4.c、drv_pmhw.h 和 drv_pmtim.c 四个文件到工程中。

在测试时测试过程如下，下载程序后查看当前处于运行模式，然后请求 DeepSleep 也就是停止模式，然后释放掉 None Mode，此时板子就唤醒不了了，按理说在停止模式下可以使用外部中断（外部按键）进行唤醒，但是按下按键没有响应。在裸机代码中使用按键可以唤醒 stop 模式。

```
 \ | /
- RT -     Thread Operating System
 / | \     4.0.4 build May 30 2022 14:08:12
 2006 - 2021 Copyright by rt-thread team
[I/drv.rtc] RTC hasn't been configured, please use <date> command to config.
msh >date
Sat Jan  1 00:06:25 2000
msh >list_device
device           type         ref count
-------- -------------------- ----------
rtc      RTC                  0
pm       PM Pseudo Device     0
uart1    Character Device     2
pin      Miscellaneous Device 0
msh >
msh >pm_dump
| Power Management Mode | Counter | Timer |
+-----------------------+---------+-------+
|             None Mode |       1 |     0 |
|             Idle Mode |       0 |     0 |
|       LightSleep Mode |       0 |     0 |
|        DeepSleep Mode |       0 |     1 |
|          Standby Mode |       0 |     0 |
|         Shutdown Mode |       0 |     0 |
+-----------------------+---------+-------+
pm current sleep mode: None Mode
pm current run mode:   Normal Speed

| module | busy | start time |  timeout  |
+--------+------+------------+-----------+
|  0001  |  0   | 0x00000000 | 0x00000000 |
+--------+------+------------+-----------+
msh >
msh >pm_request 3
msh >
msh >pm_dump
| Power Management Mode | Counter | Timer |
+-----------------------+---------+-------+
|             None Mode |       1 |     0 |
|             Idle Mode |       0 |     0 |
|       LightSleep Mode |       0 |     0 |
|        DeepSleep Mode |       1 |     1 |
|          Standby Mode |       0 |     0 |
|         Shutdown Mode |       0 |     0 |
+-----------------------+---------+-------+
pm current sleep mode: None Mode
pm current run mode:   Normal Speed

main.c 的代码如下：
```c
#include <rtthread.h>
#include "rtdevice.h"
#include "drv_common.h"

#include "led.h"
#include "key.h"

#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>

void pm_notify_callback(rt_uint8_t event, rt_uint8_t mode, void *data)
{
    if(event == RT_PM_ENTER_SLEEP)
    {
        //if(mode == PM_SLEEP_MODE_DEEP)
        {
            led0_on();
            rt_kprintf("on\n");
        }
    }
    else if (event == RT_PM_EXIT_SLEEP)
    {
        //if(mode == PM_SLEEP_MODE_DEEP)
        {
            led0_off();
            rt_kprintf("off\n");
        }
    }
}

int main(void)
{
    led_init();
    key_irq_init();

rt_pm_notify_set(pm_notify_callback, 0);

while (1)
    {
        led1_on();
        rt_thread_mdelay(500);

led1_off();
        rt_thread_mdelay(500);
    }

return RT_EOK;
}
```

按键的初始化代码如下，在没有休眠时，按下 KEY0 或者 KEY1 可以进入回调函数打印 "key irq\n"

```c
#include <rtthread.h>
#include "rtdevice.h"
#include "drv_common.h"

#include "key.h"

#define DBG_TAG "led.c"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>

#define KEY0_RTT_PIN    (GET_PIN(H, 3))     // 按下低电平
#define KEY1_RTT_PIN    (GET_PIN(H, 2))     // 按下低电平
#define KEY2_RTT_PIN    (GET_PIN(C, 13))    // 按下低电平
#define WKUP_RTT_PIN    (GET_PIN(A, 0))     // 按下高电平

void key_irq_callback(void *args)
{
    //rt_pm_request(PM_SLEEP_MODE_NONE);
    rt_kprintf("key irq\n");
}

void key_irq_init(void)
{
    // key0
    rt_pin_mode(KEY0_RTT_PIN, PIN_MODE_INPUT_PULLUP);   // 输入模式
    rt_pin_attach_irq(KEY0_RTT_PIN, PIN_IRQ_MODE_FALLING, key_irq_callback, RT_NULL);   // 下降沿触发中断
    rt_pin_irq_enable(KEY0_RTT_PIN, PIN_IRQ_ENABLE);    // 使能中断

// key1
    rt_pin_mode(KEY1_RTT_PIN, PIN_MODE_INPUT_PULLUP);   // 输入模式
    rt_pin_attach_irq(KEY1_RTT_PIN, PIN_IRQ_MODE_FALLING, key_irq_callback, RT_NULL);   // 下降沿触发中断
    rt_pin_irq_enable(KEY1_RTT_PIN, PIN_IRQ_ENABLE);    // 使能中断

// key2
//    rt_pin_mode(KEY2_RTT_PIN, PIN_MODE_INPUT_PULLUP);   // 输入模式
//    rt_pin_attach_irq(KEY2_RTT_PIN, PIN_IRQ_MODE_FALLING, key_irq_callback, RT_NULL);   // 下降沿触发中断
//    rt_pin_irq_enable(KEY2_RTT_PIN, PIN_IRQ_ENABLE);    // 使能中断

// wakeup
//    rt_pin_mode(WKUP_RTT_PIN, PIN_MODE_INPUT_PULLDOWN); // 输入模式
//    rt_pin_attach_irq(WKUP_RTT_PIN, PIN_IRQ_MODE_RISING, key_irq_callback, RT_NULL);    // 上降沿触发中断
//    rt_pin_irq_enable(WKUP_RTT_PIN, PIN_IRQ_ENABLE);    // 使能中断
}
```

老斑鸠 2022-05-30

这家伙很懒，什么也没写！

不要在 msh 里用命令请求休眠。 单独写个测试命令，起个线程去请求休眠模式可能就好了。

命令是运行在 tshell 线程中的，你现在可能已经唤醒了，但是 shell 线程没退出来，不能把串口的数据拿回来，就卡在里面了。

```c
static void wakeup_callback(void* p)
{
    rt_event_send(wakeup_event, WAKEUP_EVENT_BUTTON);
}

void wakeup_sample(void)
{
    /* init */
    rt_uint32_t pin = rt_pin_get(USER_INPUT);
    rt_kprintf("\n pin number : 0x%04X \n", pin);
    rt_err_t err = rt_pin_attach_irq(pin, PIN_IRQ_MODE_RISING, wakeup_callback, RT_NULL);
    if (RT_EOK != err)
    {
        rt_kprintf("\n attach irq failed. \n");
    }
    err = rt_pin_irq_enable(pin, PIN_IRQ_ENABLE);
    if (RT_EOK != err)
    {
        rt_kprintf("\n enable irq failed. \n");
    }
}

static void wakeup_init(void)
{
    wakeup_event = rt_event_create("wakup", RT_IPC_FLAG_FIFO);
    RT_ASSERT(wakeup_event != RT_NULL);
    wakeup_sample();
}

static void pm_mode_init(void)
{
    rt_pm_release_all(RT_PM_DEFAULT_SLEEP_MODE);
    rt_pm_request(PM_SLEEP_MODE_NONE);
}

void pm_test_entry(void* para)
{
    /* 唤醒回调函数初始化 */
    wakeup_init();

/* 电源管理初始化 */
    pm_mode_init();

while (1)
    {
        /* 等待唤醒事件 */
        if (rt_event_recv(wakeup_event,
                          WAKEUP_EVENT_BUTTON,
                          RT_EVENT_FLAG_AND | RT_EVENT_FLAG_CLEAR,
                          RT_WAITING_FOREVER, RT_NULL) == RT_EOK)
        {
            led_app();
        }
    }
}

int pm_test(void)
{

rt_thread_t tid = rt_thread_create(
            "pmtest",pm_test_entry,RT_NULL,512,10,10);
    if(tid)
        rt_thread_startup(tid);

return 0;
}
MSH_CMD_EXPORT(pm_test, pm_test);
#endif

```