下面是我的程序，希望香主帮我看看那里有问题。
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC Configuration */
NVIC_Configuration();
/* GPIO ports pins Configuration */
GPIO_Configuration();
while (1)
{
/* CAN transmit at 100Kb/s and receive by polling in loopback mode*/
TestRx = CAN_Polling();
if (TestRx == FAILED)
{
/* Turn on led connected to PC.06 pin (LD3) */
GPIO_SetBits(GPIOC, GPIO_Pin_6);
}
else
{
/* Turn on led connected to PC.04 pin (LD5) */
GPIO_SetBits(GPIOC, GPIO_Pin_4);
}
/* CAN transmit at 500Kb/s and receive by interrupt in loopback mode*/
TestRx = CAN_Interrupt();
if (TestRx == FAILED)
{
/* Turn on led connected to PC.05 pin (LD4) */
GPIO_SetBits(GPIOC, GPIO_Pin_5);
}
else
{
/* Turn on led connected to PC.07 pin (LD2) */
GPIO_SetBits(GPIOC, GPIO_Pin_7);
}
}
while (1)
{
}
}
/*******************************************************************************
* 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 and GPIOC clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC |RCC_APB2Periph_AFIO , ENABLE);
/* CAN Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 |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;
/* Configure PC.06, PC.07, PC.08 and PC.09 as Output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure CAN pin: RX */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* Configure CAN pin: TX */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_Remap2_CAN,ENABLE);
}
/*******************************************************************************
* 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)
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
CanTxMsg TxMessage;
CanRxMsg RxMessage;
u32 i = 0;
u8 TransmitMailbox;
GPIO_PinRemapConfig(GPIO_Remap2_CAN,ENABLE);
/* 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_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;
CAN_Init(&CAN_InitStructure);
/* 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=CAN_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
CAN_WakeUp();
/* transmit */
CAN->MCR |= 0x00000000;
TxMessage.StdId=0x0010;
TxMessage.RTR=CAN_RTR_DATA;
TxMessage.IDE=CAN_ID_STD;
TxMessage.DLC=8;
TxMessage.Data[0]=0xCA;
TxMessage.Data[1]=0xFE;
TxMessage.Data[2]=0xCA;
TxMessage.Data[3]=0xCA;
TxMessage.Data[4]=0xCA;
TxMessage.Data[5]=0xCA;
TxMessage.Data[6]=0xCA;
TxMessage.Data[7]=0xCA;
TransmitMailbox=CAN_Transmit(&TxMessage);
CAN->sTxMailBox[TransmitMailbox].TIR |= 0x00000001;
i = 0;
while((CAN_TransmitStatus(TransmitMailbox) != CANTXOK) && (i != 0xFF))
{
i++;
}
i = 0;
while((CAN_MessagePending(CAN_FIFO0) < 1) && (i != 0xFF))
{
i++;
}
/* receive */
RxMessage.StdId=0x0001;
RxMessage.IDE=CAN_ID_STD;
RxMessage.DLC=2;
RxMessage.Data[0]=0x00;
RxMessage.Data[1]=0x00;
CAN_Receive(CAN_FIFO0, &RxMessage);
//if (RxMessage.StdId!=0x01) return FAILED;
if (RxMessage.IDE!=CAN_ID_STD) return FAILED;
//if (RxMessage.DLC!=2) return FAILED;
//if ((RxMessage.Data[0]<<8|RxMessage.Data[1])!=0xCAFE) return FAILED;
return PASSED; /* Test Passed */
}
/*******************************************************************************
* Function Name : CAN_Interrupt
* Description : Configures the CAN and transmit and receive by interruption
* Input : None
* Output : None
* Return : PASSED if the reception is well done, FAILED in other case
*******************************************************************************/
TestStatus CAN_Interrupt(void)
{
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
CanTxMsg TxMessage;
u32 i = 0;
/* 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_InitStructure.CAN_SJW=CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1=CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2=CAN_BS2_7tq;
CAN_InitStructure.CAN_Prescaler=1;
CAN_Init(&CAN_InitStructure);
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber=1;
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 FIFO0 message pending interrupt enable */
CAN_ITConfig(CAN_IT_FMP0, ENABLE);
/* 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;
CAN_Transmit(&TxMessage);
/* initialize the value that will be returned */
//ret = 0xFF;
/* receive message with interrupt handling */
i=0;
while((ret == 0xFF) && (i < 0xFFF))
{
i++;
}
if (i == 0xFFF)
{
ret=0;
}
/* disable interrupt handling */
CAN_ITConfig(CAN_IT_FMP0, DISABLE);
return (TestStatus)ret;
}
#ifdef DEBUG
/*******************************************************************************
* 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
", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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