为什么can引脚改成pa11和pa12就没有波形了，pd0和pd1就可以，复用功能已经注释了，其它程序都不变，为什么会这样？

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1楼-- · 2019-08-08 16:10

#include "stm32f10x.h"
#include <stdio.h>

#define CAN1_RX0_INT_ENABLE 1

void RCC_Configuration(void)
{
RCC_DeInit();//???RCC?????????
RCC_HSEConfig(RCC_HSE_ON);//????????(HSE)

if( RCC_WaitForHSEStartUp() != RESET)
{
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//???????????--???????
FLASH_SetLatency(FLASH_Latency_2);

RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);//??PLL????????
RCC_PLLCmd(ENABLE);//??????PLL
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);//?????RCC???????
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//??????(SYSCLK)
while(RCC_GetSYSCLKSource() == RESET);//????????????
RCC_HCLKConfig(RCC_SYSCLK_Div1);//??AHB??(HCLK)
RCC_PCLK1Config(RCC_HCLK_Div1);//????AHB??(PCLK1)
RCC_PCLK2Config(RCC_HCLK_Div1);//????AHB??(PCLK2)
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOC,ENABLE);
}
}
void USART_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200; //?????9600;
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_Rx | USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure);
//USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//??????
USART_Cmd(USART1, ENABLE);

//USART_ClearFlag(USART1, USART_FLAG_TC);    /*?????????,????????,?????????????*/

}

void CAN1_Init(u8 Tsjw,u8 Tbs2,u8 Tbs1,u16 Brp,u8 Mode)
{
    GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef         CAN_InitStructure;
    CAN_FilterInitTypeDef    CAN_FilterInitStructure;

#if CAN1_RX0_INT_ENABLE
   NVIC_InitTypeDef  NVIC_InitStructure;
#endif

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD,ENABLE);
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1,ENABLE);

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
// GPIO_Init(GPIOD, &GPIO_InitStructure);
//
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
// GPIO_Init(GPIOD, &GPIO_InitStructure);

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

  /* Configure CAN pin: TX */ // PA12
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
// GPIO_Init(GPIOB, &GPIO_InitStructure);
//
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
// GPIO_Init(GPIOB, &GPIO_InitStructure);

// GPIO_PinRemapConfig(GPIO_Remap2_CAN1, ENABLE);
// GPIO_PinRemapConfig(GPIO_Remap1_CAN1, ENABLE);

//-------------------CANμ￥ÔaéèÖÃ-------------------------------------//
   CAN_InitStructure.CAN_TTCM=DISABLE; //·Çê±¼ä′￥·￠í¨DÅÄ￡ê½
    CAN_InitStructure.CAN_ABOM=DISABLE; //èí¼t×Ô¶ˉàëÏß1üàí
    CAN_InitStructure.CAN_AWUM=DISABLE;//ËˉÃßÄ￡ê½í¨1yèí¼t»½DÑ(Çå3yCAN->MCRμÄSLEEPÎ»)
    CAN_InitStructure.CAN_NART=ENABLE; //½ûÖ1±¨ÎÄ×Ô¶ˉ′«Ëí
    CAN_InitStructure.CAN_RFLM=DISABLE; //±¨ÎÄ2»Ëø¶¨,DÂμÄ¸2¸Ç¾éμÄ
    CAN_InitStructure.CAN_TXFP=DISABLE; //óÅÏè¼¶óé±¨ÎÄ±êê¶·û¾ö¶¨

    CAN_InitStructure.CAN_Mode= Mode;    //Ä￡ê½éèÖÃ
    CAN_InitStructure.CAN_SJW=Tsjw; //ÖØDÂí¬2½ìøÔ¾¿í¶è(Tsjw)Îatsjw+1¸öê±¼äμ￥Î» CAN_SJW_1tq~CAN_SJW_4tq
    CAN_InitStructure.CAN_BS1=Tbs1; //Tbs1·¶Î§CAN_BS1_1tq ~CAN_BS1_16tq
    CAN_InitStructure.CAN_BS2=Tbs2;//Tbs2·¶Î§CAN_BS2_1tq ~ CAN_BS2_8tq
    CAN_InitStructure.CAN_Prescaler=Brp;  //·ÖÆμÏμêy(Fdiv)Îabrp+1
    CAN_Init(CAN1, &CAN_InitStructure); // 3õê¼»ˉCAN1 BS1>=tBS2 tBS2>=1¸öCANÖüÆú tBS2>=2tSJW

//-------------------ÅäÖÃ1yÂËÆ÷-------------------------------------//
   CAN_FilterInitStructure.CAN_FilterNumber=0;    //1yÂËÆ÷0
    CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;
    CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit; //32Î»
    CAN_FilterInitStructure.CAN_FilterIdHigh=0x0000;////32Î»ID
    CAN_FilterInitStructure.CAN_FilterIdLow=0x0000;
    CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0x0000;//32Î»MASK
    CAN_FilterInitStructure.CAN_FilterMaskIdLow=0x0000;
   CAN_FilterInitStructure.CAN_FilterFIFOAssignment=CAN_Filter_FIFO0;//1yÂËÆ÷01Øáaμ½FIFO0
    CAN_FilterInitStructure.CAN_FilterActivation=ENABLE; //¼¤»î1yÂËÆ÷0
    CAN_FilterInit(&CAN_FilterInitStructure);//ÂË2¨Æ÷3õê¼»ˉ

#if CAN1_RX0_INT_ENABLE
   CAN_ITConfig(CAN1,CAN_IT_FMP0,ENABLE);//FIFO0ÏûÏ￠1òoÅÖD¶ÏÔêDí.
    NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;    // Ö÷óÅÏè¼¶Îa1
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;          // ′ÎóÅÏè¼¶Îa0
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
#endif
}

/*********************************ÖD¶Ï·tÎñoˉêy***************************************/
#if CAN1_RX0_INT_ENABLE
void USB_LP_CAN1_RX0_IRQHandler(void)
{
int i=0;
CanRxMsg RxMessage;
CAN_Receive(CAN1, 0, &RxMessage);

for(i=0;i<8;i++)
{
printf("rxbuf[%d]:%d ",i,RxMessage.Data[i]);
}
}
#endif

/************************CAN Send Function***********************************
*@param  len:data length(<=8); msg:data pointer(8bytes)
*@retval 0:success; others:failt
*******************************************************************************/

u8 CAN1_Send_Msg(u8* msg,u8 len)
{
  u8 mbox;
  u16 i=0;
  CanTxMsg TxMessage;
  TxMessage.StdId=0x12;    // ±ê×¼±êê¶·ûÎa0
  TxMessage.ExtId=0x12;    // éèÖÃà©Õ1±êê¾·û￡¨29Î»￡©
  TxMessage.IDE=0;    // ê1óÃà©Õ1±êê¶·û
  TxMessage.RTR=0;    // ÏûÏ￠ààDíÎaêy¾YÖ¡￡¬ò»Ö¡8Î»
  TxMessage.DLC=len;    // ·￠Ëíá½Ö¡DÅÏ￠
  for(i=0;i<len;i++)
  TxMessage.Data[i]=msg[i];    // μúò»Ö¡DÅÏ￠
  mbox= CAN_Transmit(CAN1, &TxMessage);
  i=0;
  while((CAN_TransmitStatus(CAN1, mbox)==CAN_TxStatus_Failed)&&(i<0XFFF))i++; //μè′y·￠Ëí½áêø
  if(i>=0XFFF)return 1;
  return 0;
}
/************************CAN Receive Function***********************************
*@param  buf:data buffer cache
*@retval 0:none datas; others:data length
*******************************************************************************/
u8 CAN1_Receive_Msg(u8 *buf)
{
u32 i;
CanRxMsg RxMessage;
  if( CAN_MessagePending(CAN1,CAN_FIFO0)==0)return 0; //Ã»óD½óêÕμ½êy¾Y,Ö±½óíË3ö

CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);//¶áè¡êy¾Y
  for(i=0;i<RxMessage.DLC;i++)
{
  buf[i]=RxMessage.Data[i];
}
return RxMessage.DLC;
}

void delay(int num)
{
while(num--);
}

int fputc(int ch , FILE *f)
{
//USART_ClearFlag(USART1,USART_FLAG_TC);
USART_SendData(USART1, (u8)ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
return (ch);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void delay_ms(u16 nms)
{
   u32 temp;
   SysTick->LOAD = 9000*nms;
   SysTick->VAL=0X00;//?????
   SysTick->CTRL=0X01;//??,???????,???????
   do
   {
   temp=SysTick->CTRL;//????????
   }while((temp&0x01)&&(!(temp&(1<<16))));//??????
   SysTick->CTRL=0x00; //?????
   SysTick->VAL =0X00; //?????
}

int main()
{
u8 re;
u8 sendmsg[8] = {1,2,3,4,5,6,7,8};

RCC_Configuration();
USART_Configuration();
GPIO_Configuration();

CAN1_Init(CAN_SJW_1tq,CAN_BS2_3tq,CAN_BS1_12tq,9,CAN_Mode_Normal);//CAN_Mode_Normal  CAN_Mode_LoopBack

while(1)
{
// GPIO_SetBits(GPIOC,GPIO_Pin_6);
// delay_ms(500);
// GPIO_ResetBits(GPIOC,GPIO_Pin_6);
// delay_ms(500);

printf ("ok");
re = CAN1_Send_Msg(sendmsg,8);
printf("re = %d ",re);
}

}

目瞪狗呆

2楼-- · 2019-08-08 18:56

小白，帮顶一下

为什么can引脚改成pa11和pa12就没有波形了，pd0和pd1就可以，复用功能已经注释了，其它程序都不变，为什么会这样？

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