stm32之定時(shí)器徹底研究

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 "STM32Libstm32f10x.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(); //片內硬件初始化
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、定時(shí)器，通過(guò)串口將當前計數值發(fā)給PC。

同時(shí)通過(guò)can總線(xiàn)對外發(fā)送數據

另外使用了printf，程序中有相應的配置。

5、can.c文件

#include "STM32Libstm32f10x.h"
#include "hal.h"
#include

//CAN總線(xiàn)的發(fā)送接收管腳的初始化
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; //時(shí)間觸發(fā)
CAN_InitStructure.CAN_ABOM=DISABLE; //自動(dòng)離線(xiàn)管理
CAN_InitStructure.CAN_AWUM=DISABLE; //自動(dòng)喚醒
CAN_InitStructure.CAN_NART=DISABLE; //ENABLE:錯誤不自動(dòng)重傳 DISABLE:重傳
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; //波特率為 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);
}
//發(fā)送一個(gè)2字節的數據
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;//用來(lái)設定標準標識符（0-0x7ff，11位）
//TxMessage.ExtId=pTransmitBuf ->ExtId;
TxMessage.RTR= pTransmitBuf ->RTR;//設置RTR位為數據幀
TxMessage.IDE= pTransmitBuf ->IDE;//標識符擴展位，為標準幀
TxMessage.DLC= pTransmitBuf ->DLC;//設置數據長(cháng)度
//根據DLC字段的值，將有效數據拷貝到發(fā)送數據寄存器
memcpy(TxMessage.Data, pTransmitBuf ->Data,pTransmitBuf ->DLC);
TransmitMailbox = CAN_Transmit(CAN1,&TxMessage);
TransmitMailbox=TransmitMailbox;//加上這句話(huà)就是防止編譯器產(chǎn)生警告
return 1;
}
#endif

在調用can_send(CanTxMsg *pTransmitBuf)發(fā)送數據之前，要對can總線(xiàn)進(jìn)行相應的配置。

6、hal.c文件

//STM32F103RBT6有三個(gè)通用定時(shí)器，定時(shí)器2、3、4；操作基本一致
#include "STM32Libstm32f10x.h"

//各個(gè)內部硬件模塊的配置函數
extern void GPIO_Configuration(void); //GPIO
extern void RCC_Configuration(void); //RCC
extern void USART_Configuration(void); //串口
extern void NVIC_Configuration(void); //NVIC

extern void TIM2_Configuration(void);
extern void TIM3_Configuration(u16 p,u16 psc);
extern void TIM4_Configuration(void);
extern void TIM_Configuration(u16 p,u16 psc);

extern void CAN_Configuration(void);
extern void CAN_Interrupt(void);

void ChipHalInit(void)
{
//初始化時(shí)鐘源
RCC_Configuration();

//初始化GPIO
GPIO_Configuration();

//初始化中斷源
NVIC_Configuration();

//初始化串口
USART_Configuration();

//初始化定時(shí)器
//TIM2_Configuration();
//
//TIM3_Configuration(10000,7199);

//TIM4_Configuration();
TIM_Configuration(10000,7199);
//初始化CAN總線(xiàn)
CAN_Configuration();
//初始化CAN總線(xiàn)接收中斷
CAN_Interrupt();

}

void ChipOutHalInit(void)
{

}