问题如题，以下是我的源代码：请各位大侠帮帮忙！
源代码有两个部分，一个是main.c 一个是stm32f10x_it.c(此文件中我只使用了can接收中断和系统定时中断) （cantx和canrx都是一样的）
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : main.c
* Author : MCD Application Team
* Version : V1.0
* Date : 10/08/2007
* Description : Main program body
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
/* Local includes ------------------------------------------------------------*/
/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
vu32 ret; /* for return of the interrupt handling */
volatile TestStatus TestRx;
ErrorStatus HSEStartUpStatus;
u16 TimingDelay;
/* Private functions ---------------------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
TestStatus CAN_Polling(void);
TestStatus CAN_Interrupt(void);
void SysTick_Configuration(void);
void delay_ms(u16 temp)
{
TimingDelay = temp;
while(TimingDelay != 0);
}
/*******************************************************************************
* Function Name : SysTick_Configuration
* Description : 系统时钟设置
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SysTick_Configuration(void)
{
RCC_ClocksTypeDef RCC_ClocksStatus;
/* Return SysTick data */
RCC_GetClocksFreq(&RCC_ClocksStatus);
/* SysTick event each 1 ms with input clock equal to 9MHz (HCLK/8)*/
SysTick_SetReload(RCC_ClocksStatus.HCLK_Frequency/8/1000);
/* Enable the SysTick Interrupt */
SysTick_ITConfig(ENABLE);
/* Enable the SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Enable);
}
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
CanTxMsg TxMessage;
u32 i = 0;
u8 temp_data;
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC Configuration */
NVIC_Configuration();
/* GPIO ports pins Configuration */
GPIO_Configuration();
/* System Clocks */
SysTick_Configuration();
/* CAN transmit at 100Kb/s and receive by polling in loopback mode*/
TestRx = CAN_Polling();
while (1)
{
/* transmit 1 message */
TxMessage.StdId=0x12;
TxMessage.ExtId=0x34;
TxMessage.IDE=CAN_ID_EXT;
TxMessage.RTR=CAN_RTR_DATA;
TxMessage.DLC=2;
TxMessage.Data[0]=0xDE;
TxMessage.Data[1]=0xCA;
temp_data = CAN_Transmit(&TxMessage);
temp_data = CAN_TransmitStatus(temp_data);
i = 0;
while(( temp_data != CANTXOK) && (i != 0xFF))
{
i++;
temp_data = CAN_TransmitStatus(temp_data);
}
GPIOA->ODR |= 0x0100; //蜂鸣器响:
if(temp_data == CANTXOK) delay_ms(600); //以不同声音区分发送状态；
else delay_ms(100);
GPIOA->ODR &= (~0x0100); //蜂鸣器关:
delay_ms(900);
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Select HSE as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
/* Wait till HSE is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x04)
{
}
}
/* GPIOA , GPIOB ,GPIOC , GPIOD and AFIO clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOD, ENABLE);
/* CAN Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//GPIO_PinRemapConfig(GPIO_Remap1_CAN, ENABLE);
/* Configure PA.08 Output push-pull */ //蜂鸣器;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure CAN pin: RX */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure CAN pin: TX */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures the NVIC and Vector Table base address.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
/* enabling interrupt */
NVIC_InitStructure.NVIC_IRQChannel=USB_LP_CAN_RX0_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name : CAN_Polling
* Description : Configures the CAN and transmit and receive by polling
* Input : None
* Output : None
* Return : PASSED if the reception is well done, FAILED in other case
*******************************************************************************/
TestStatus CAN_Polling(void)
{u8 Error;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* CAN register init */
CAN_DeInit();
CAN_StructInit(&CAN_InitStructure);
/* CAN cell init */
CAN_InitStructure.CAN_TTCM=DISABLE;
CAN_InitStructure.CAN_ABOM=DISABLE;
CAN_InitStructure.CAN_AWUM=DISABLE;
CAN_InitStructure.CAN_NART=DISABLE;
CAN_InitStructure.CAN_RFLM=DISABLE;
CAN_InitStructure.CAN_TXFP=DISABLE;
CAN_InitStructure.CAN_Mode=CAN_Mode_Normal;//CAN_Mode_LoopBack;
CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1=CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2=CAN_BS2_7tq;
CAN_InitStructure.CAN_Prescaler=5;
Error =CAN_Init(&CAN_InitStructure);
if (Error == 0)
return FAILED;
/* CAN filter init */
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=0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
CAN_ITConfig(CAN_IT_TME, ENABLE);
return PASSED; /* Test Passed */
}
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* Input : - file: pointer to the source file name
* - line: assert_param error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
//文件2：stm32f10x_it.c
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : stm32f10x_it.c
* Author : MCD Application Team
* Version : V1.0
* Date : 10/08/2007
* Description : Main Interrupt Service Routines.
* This file can be used to describe all the exceptions
* subroutines that may occur within user application.
* When an interrupt happens, the software will branch
* automatically to the corresponding routine.
* The following routines are all empty, user can write code
* for exceptions handlers and peripherals IRQ interrupts.
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_it.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
extern vu32 ret;
extern u16 TimingDelay;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : SysTickHandler
* Description : This function handles SysTick Handler.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SysTickHandler(void)
{
if(TimingDelay > 0) TimingDelay--;
}
/*******************************************************************************
* Function Name : USB_HP_CAN_TX_IRQHandler
* Description : This function handles USB High Priority or CAN TX interrupts
* requests.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USB_HP_CAN_TX_IRQHandler(void)
{
CAN_ITConfig(CAN_IT_TME, DISABLE);
}
/*******************************************************************************
* Function Name : USB_LP_CAN_RX0_IRQHandler
* Description : This function handles USB Low Priority or CAN RX0 interrupts
* requests.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USB_LP_CAN_RX0_IRQHandler(void)
{
vu8 temp_flag=0; //用于在线调试的时候看数据所用
CanRxMsg RxMessage;
RxMessage.StdId=0x00;
RxMessage.ExtId=0x00;
RxMessage.IDE=0;
RxMessage.DLC=0;
RxMessage.FMI=0;
RxMessage.Data[0]=0x00;
RxMessage.Data[1]=0x00;
CAN_Receive(CAN_FIFO0, &RxMessage);
if((RxMessage.StdId==0x12) && (RxMessage.ExtId==0x34) && (RxMessage.IDE==CAN_ID_EXT)
&& (RxMessage.DLC==2) && ((RxMessage.Data[1]|RxMessage.Data[0]<<8)==0xDECA))
{
temp_flag = 1;
}
else
{
temp_flag = 0;
}
temp_flag = 0;
}
/*******************************************************************************
* Function Name : CAN_RX1_IRQHandler
* Description : This function handles CAN RX1 interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void CAN_RX1_IRQHandler(void)
{
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
香斑也挺郁闷的，咋天天看别人的source code呢
哈哈！我也不想，但是我坚持独自一个人搞了一周了还不见进展故来网上请教高手！就等不见高人回帖自得请版主了！
哈哈！我也不想，但是我坚持独自一个人搞了一周了还不见进展故来网上请教高手！久等不见高人回帖只得请版主了！
1.CAN正常通信模式，需要至少2个节点
2.用示波器看看CAN_RX引脚的电平，正常应该是高电平
我现在检测出一些现象，我改为正常模式后上电一开始检测到了一组波形从CANTX输出，之后就不在出现波形（使用回环模式结果是不停发送的，因为我的程序就是让他不停发送的）
第二个现象是，我使用回环模式下CANTX不停发送信号，我一路跟踪信号到MCP2551-I / SN的第一脚TXD波形仍然是正常，但是我此时用示波器量到MCP2551-I / SN输出引脚CANH和CANL的时候却没有了变化。这里有点晕呀！
IJK，谢谢您的回复
我有点疑惑，
1、2个节点是要3个设备吧？
2、如果我现在只有两台一样的设备（都可收发，我使用一台收，一台发）可以发数据吗？
3、正常模式下用示波器测CAN_RX引脚的电平是3.4V左右正常吗？
1、2个节点 2个设备就行了
2、如果只有两台一样的设备（都可收发，我使用一台收，一台发），可以发数据
3、正常模式下用示波器测CAN_RX引脚的电平是3.4V左右，基本正常
另外，看CAN初始化(CAN_Polling)是否成功，还要看CAN的状态寄存器。
CAN初始化成功，返回PASSED标志，还有就是发生后我检测发送状态寄存器返回值为CANTXPENDING 标志
我修改了波特率和那个发送数据个数后发现
如果更改发送数据个数为8个
/* transmit 1 message */
TxMessage.StdId=0x12;
TxMessage.ExtId=0x34;
TxMessage.IDE=CAN_ID_EXT;
TxMessage.RTR=CAN_RTR_DATA;
TxMessage.DLC=8;
for(i=0;i<8;i++)
{
TxMessage.Data[i]=i;
}
或者更改波特率设置为如下 CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1=CAN_BS1_9tq;
CAN_InitStructure.CAN_BS2=CAN_BS2_8tq;
CAN_InitStructure.CAN_Prescaler=200;
以上两种更改都会导致在回环模式下都无法发送正常。
哈哈！总算搞定了。我这只瞎猫总算碰上了死耗子！东猜西猜总算找到了问题，发送不成功是我一只稳压管有问题把它拉到地了。发送搞定了有出现接收到的ID出现全0的现象（不过那个程序不是这个，是我改过的精简版本），后来又改成这个OK了（是发送参数变量ID中途被清零了）。
STM32can通信
我也遇到了STM32can在回环模式下能够发送数据，而在正常模式下，尽在启动的时候示波器测得一帧数据的问题，请高手帮忙，留个QQ：455853630,
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