2019年04月10日 | STM32实战 4.利用定时器与串口接收指令控制LED亮度

#include "sys.h"

#include "led.h"

#include "delay.h"

#include "string.h"

#include "USART3_TIM2.h"

char *str_open = "open";

char *str_close = "close";

int main(void)

{

delay_init();

Led_Init();

USART3_TIM2_Init(115200);

while(1)

{

if(RX_stat == 1)//表示接受完成

{

if(strcmp(RX_buf,str_open) == 0)

{

LED = 0;

}

if(strcmp(RX_buf,str_close) == 0)

{

LED = 1;

}

RX_stat = 0;

count = 0;

memset(RX_buf,0,strlen(RX_buf));

}

  }

}

#include "led.h"

void Led_Init(void)

{

//结构体的声明，必须放在最前面，不能有任何

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOC, &GPIO_InitStructure);//区地址符

}

#include "USART3_TIM2.h"

u8 count = 0;

u8 RX_stat = 0;//0表示接收未完成，1表示接收完成

char RX_buf[10] = {0};

void USART3_TIM2_Init(u32 bound)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

//开启系统和复用功能时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

//PB10配置为复用推挽式输出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOB, &GPIO_InitStructure);

//PB11配置为浮空输入

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOB, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = bound;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

USART_Init(USART3, &USART_InitStructure);

USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);//配置串口接收为中断模式

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

USART_Cmd(USART3,ENABLE);

USART_ClearFlag(USART3,USART_FLAG_TC);

//开启TIM2的使能定时器

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

TIM_TimeBaseStructure.TIM_Period = (100 - 1);//ARR

TIM_TimeBaseStructure.TIM_Prescaler = (7200 - 1);//PSC

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//选择时钟不分割

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure);

//使能定时器2的中断

TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);

//配置定时器2的中断优先级

NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

//使能定时器2

TIM_Cmd(TIM2,DISABLE);

}

void USART3_IRQHandler(void)

{

USART_ClearFlag(USART3,USART_FLAG_RXNE);

RX_buf[count] =  USART_ReceiveData(USART3);

count++;

TIM_SetCounter(TIM2,0);

TIM_Cmd(TIM2,ENABLE);

}

void TIM2_IRQHandler(void)

{

TIM_ClearFlag(TIM2,TIM_FLAG_Update);

TIM_Cmd(TIM2,DISABLE);

RX_stat = 1;

}