stm32之定时器彻底研究

void TIM3_IRQHandler(void)
{
if(TIM3->SR&0X0001)
{
cnt++;
flag=1;
}
TIM3->SR&=~(1<0);
}

void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
cnt++;
flag=1;
}
}

可以看到，定时器2有多个处理的事件，四个通道的计数溢出和定时器的总溢出。具体事件根据应用来配置。

另外，以上代码只是对三个通用定时器进行测试，具体应用根据情况来定。

3、NVIC.c文件

#include "STM32Lib\stm32f10x.h"

//设置所有的中断允许

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

#if 1

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

#endif

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

4、main.c文件

#include "STM32Lib\stm32f10x.h"
#include "hal.h"
#include "stdio.h"
#include "string.h"
extern unsigned int cnt;
extern unsigned int flag;

int fputc(int ch, FILE *f)
{
//USART_SendData(USART1, (u8) ch);

USART1->DR = (u8) ch;

while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{
}
return ch;
}

int main(void)
{
CanTxMsg msg;
msg.StdId=0x11;
msg.DLC=8;
msg.IDE=CAN_ID_STD;
msg.RTR=CAN_RTR_DATA;
memset(msg.Data,0x11,8);
ChipHalInit(); //片内硬件初始化
ChipOutHalInit(); //片外硬件初始化

for(;;)
{
can_send(&msg);
if(flag)
{
flag=0;

printf("cnt is %d",cnt);
}
}
}

本程序使用了串口、定时器，通过串口将当前计数值发给PC。

同时通过can总线对外发送数据

另外使用了printf，程序中有相应的配置。

5、can.c文件

#include "STM32Lib\stm32f10x.h"
#include "hal.h"
#include

//CAN总线的发送接收管脚的初始化
void CAN_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);

//RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
// RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
}

void CAN_Interrupt(void)
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
// CanTxMsg TxMessage;

CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);

CAN_InitStructure.CAN_TTCM=DISABLE; //时间触发
CAN_InitStructure.CAN_ABOM=DISABLE; //自动离线管理
CAN_InitStructure.CAN_AWUM=DISABLE; //自动唤醒
CAN_InitStructure.CAN_NART=DISABLE; //ENABLE:错误不自动重传 DISABLE:重传
CAN_InitStructure.CAN_RFLM=DISABLE;
CAN_InitStructure.CAN_TXFP=DISABLE;
CAN_InitStructure.CAN_Mode=CAN_Mode_Normal; //CAN_Mode_LoopBack，CAN_Mode_Normal
CAN_InitStructure.CAN_SJW=CAN_SJW_1tq; //1-4
CAN_InitStructure.CAN_BS1=CAN_BS1_5tq; //1-16
CAN_InitStructure.CAN_BS2=CAN_BS2_3tq; //1-8
CAN_InitStructure.CAN_Prescaler=4; //波特率为 36/(4*(1+5+3))=1000k
CAN_Init(CAN1,&CAN_InitStructure);

CAN_FilterInitStructure.CAN_FilterNumber=0;
CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;
CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

CAN_ITConfig(CAN1,CAN_IT_FMP0, ENABLE);
}
//发送一个2字节的数据
void SendCan(u16 dat)
{
CanTxMsg TxMessage;

TxMessage.ExtId=0x01;
TxMessage.IDE=CAN_ID_EXT;
TxMessage.RTR=CAN_RTR_DATA;
TxMessage.DLC=2;
TxMessage.Data[0]=dat&0xff;
TxMessage.Data[1]=dat>>8;

CAN_Transmit(CAN1,&TxMessage);
}
#if 1
int can_send(CanTxMsg *pTransmitBuf)
{
u8 TransmitMailbox=0;
CanTxMsg TxMessage;
if(pTransmitBuf -> DLC > 8)
{
return 1;
}

TxMessage.StdId=pTransmitBuf ->StdId;//用来设定标准标识符（0-0x7ff，11位）
//TxMessage.ExtId=pTransmitBuf ->ExtId;
TxMessage.RTR= pTransmitBuf ->RTR;//设置RTR位为数据帧
TxMessage.IDE= pTransmitBuf ->IDE;//标识符扩展位，为标准帧
TxMessage.DLC= pTransmitBuf ->DLC;//设置数据长度
//根据DLC字段的值，将有效数据拷贝到发送数据寄存器
memcpy(TxMessage.Data, pTransmitBuf ->Data,pTransmitBuf ->DLC);
TransmitMailbox = CAN_Transmit(CAN1,&TxMessage);
TransmitMailbox=TransmitMailbox;//加上这句话就是防止编译器产生警告
return 1;
}
#endif