設(shè)想：采用定時器，中斷觸發(fā)后通過串口發(fā)送一串hex出去。

代碼如下：

timer.h

#ifndef?TIMER_H
#define?TIMER_H

#include?"debug.h"

//?Timer?configuration?structure
typedef?struct?{
????uint16_t?period;??????//?Auto-reload?value
????uint16_t?prescaler;???//?Clock?prescaler
????uint8_t?priority;?????//?Interrupt?priority
????uint8_t?sub_priority;?//?Interrupt?sub-priority
}?Timer_Config_t;

//?Initialize?Timer2?with?configuration
void?Timer2_Init(Timer_Config_t?*config);

//?Register?callback?for?Timer2?interrupt
void?Timer2_RegisterCallback(void?(*callback)(void));

//?Start/Stop?Timer2
void?Timer2_Start(void);
void?Timer2_Stop(void);

#endif

timer.c

//?timer.c
#include?"timer.h"

static?void?(*timer2_callback)(void)?=?NULL;

void?TIM2_IRQHandler(void)?__attribute__((interrupt("WCH-Interrupt-fast")));

void?Timer2_Init(Timer_Config_t?*config)
{
????TIM_TimeBaseInitTypeDef?TIM_TimeBaseStructure?=?{0};
????NVIC_InitTypeDef?NVIC_InitStructure?=?{0};

????//?Enable?Timer2?clock
????RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,?ENABLE);

????//?Configure?Timer
????TIM_TimeBaseStructure.TIM_Period?=?config->period?-?1;
????TIM_TimeBaseStructure.TIM_Prescaler?=?config->prescaler?-?1;
????TIM_TimeBaseStructure.TIM_ClockDivision?=?TIM_CKD_DIV1;
????TIM_TimeBaseStructure.TIM_CounterMode?=?TIM_CounterMode_Up;
????TIM_TimeBaseInit(TIM2,?&TIM_TimeBaseStructure);

????//?Enable?Timer2?interrupt
????TIM_ITConfig(TIM2,?TIM_IT_Update,?ENABLE);

????//?Configure?NVIC
????NVIC_InitStructure.NVIC_IRQChannel?=?TIM2_IRQn;
????NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority?=?config->priority;
????NVIC_InitStructure.NVIC_IRQChannelSubPriority?=?config->sub_priority;
????NVIC_InitStructure.NVIC_IRQChannelCmd?=?ENABLE;
????NVIC_Init(&NVIC_InitStructure);
}

void?Timer2_RegisterCallback(void?(*callback)(void))
{
????timer2_callback?=?callback;
}

void?Timer2_Start(void)
{
????TIM_Cmd(TIM2,?ENABLE);
}

void?Timer2_Stop(void)
{
????TIM_Cmd(TIM2,?DISABLE);
}

void?TIM2_IRQHandler(void)
{
????if?(TIM_GetITStatus(TIM2,?TIM_IT_Update)?!=?RESET)
????{
????????TIM_ClearITPendingBit(TIM2,?TIM_IT_Update);

????????//?Execute?callback?if?registered
????????if?(timer2_callback?!=?NULL)
????????{
????????????timer2_callback();
????????}
????}
}

main.c片段

//發(fā)送hex
void?KeepAlive(void)
{
	//?構(gòu)建返回數(shù)據(jù)結(jié)構(gòu)
	uint8_t?response[10];
	uint8_t?address=0;
	response[0]?=?FRAME_HEAD;
	if?(rx_buffer[1]==0x00)?{
		address?=?0x11;
	}?else?{
		address?=?rx_buffer[1];
	}
	response[1]?=?((address?&?0x70)?>>?4)?|?((address?&?0x07)?<<?4);
	response[2]?=?g_tm1650_data[0];
	response[3]?=?g_tm1650_data[1];
	response[4]?=?0x13;				//當(dāng)前為固定值?g_tm1650_data[2];
	response[5]?=?0x14;				//當(dāng)前為固定值?g_tm1650_data[3];
	response[6]?=?g_tm1804_data;
	response[7]?=?0x17;				//當(dāng)前為固定值

	//?計算校驗碼
	uint8_t?resp_checksum?=?0;
	for?(int?i?=?1;?i?<=?7;?i++)
	{
		resp_checksum?^=?response[i];
	}
	response[8]?=?resp_checksum;
	response[9]?=?FRAME_TAIL;

	//?發(fā)送返回數(shù)據(jù)
	for?(int?i?=?0;?i?<?10;?i++)
	{
		while(USART_GetFlagStatus(USART1,?USART_FLAG_TC)?==?RESET);
		USART_SendData(USART1,?response[i]);
	}
}

int?main(void)
{
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
	SystemCoreClockUpdate();

	Delay_Init();

	//?配置1秒定時器
????Timer_Config_t?timer_config?=?{
????????.period?=?1000,??????????//?1ms周期
????????.prescaler?=?48,?????????//?48分頻
????????.priority?=?1,???????????//?優(yōu)先級1
????????.sub_priority?=?0????????//?子優(yōu)先級0
????};
????//?初始化定時器
????Timer2_Init(&timer_config);
????//?注冊回調(diào)函數(shù)
????Timer2_RegisterCallback(KeepAlive);

????//?啟動定時器
????Timer2_Start();
	while(1)
	{
	}
}

當(dāng)前碰到的問題是：無論如何修改.period = 1000值，感覺觸發(fā)中斷的時間都沒有變化。

您好，若方便可將工程發(fā)我郵箱（lzs@wch.cn）具體看一下

郵件已發(fā)送，謝謝~

您好，已郵件回復(fù)，經(jīng)測試，如下圖，在中斷函數(shù)中加了一個GPIO翻轉(zhuǎn)，注釋掉其他代碼，改變重裝載值，翻轉(zhuǎn)頻率會發(fā)生變化，因此定時器中斷是沒有問題的，可以檢查一下其他函數(shù)是否有問題，下次遇到該類問提可按照該方法先測試一下。后續(xù)若有問題可繼續(xù)郵箱溝通。你可以檢查一下中斷函數(shù)中那個if判斷以及回調(diào)函數(shù)是否有問題。