stm32环回收发成功，改成正常模式调不通？

只看该作者 · 2011-7-21 10:18

信号一直发送不出去~~
不可能是波特率的问题，板子一样的，软件配置一样，有一个焊有120电阻。
环回模式总线上电平也没有变化~~
是不是还要设置什么的？

只看该作者 · 2011-7-21 10:31

#include"stm32f10x_lib.h"

void CAN_configure(void)
{

CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO , ENABLE);

/* CAN1 Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);

/*can register int*/
CAN_DeInit();

/*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_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=18;
  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=((u32)0x0020<<21)>>16;//标识符
  CAN_FilterInitStructure.CAN_FilterIdLow=(((u32)0x0020<<21)|CAN_ID_STD|CAN_RTR_DATA);//&0xFFFF;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0xffff;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow=0xffff;
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment=0;;
  CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

   /* 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);
/* CAN Periph clock enable */

}

void can_send(unsigned char data)
{

CanTxMsg TxMessage;
u8 TransmitMailbox = 0;
TxMessage.StdId=0x0020;//标识符
    TxMessage.RTR=CAN_RTR_DATA;
TxMessage.IDE=CAN_ID_STD;
    TxMessage.DLC=2;
    TxMessage.Data[0]=data;
    TxMessage.Data[1]=0xFE;

    TransmitMailbox=CAN_Transmit(&TxMessage);
while(CAN_TransmitStatus(TransmitMailbox) != CANTXOK){}//等待发送

}

unsigned char can_rev(void)
{
   CanRxMsg RxMessage;

  // RxMessage.StdId=0x00;//不需要设置
    RxMessage.IDE=CAN_ID_STD;
    RxMessage.DLC=2;
    RxMessage.Data[0]=0x00;
    RxMessage.Data[1]=0x00;
    while (CAN_MessagePending(CAN_FIFO0)==0);//等到接收

   CAN_Receive(CAN_FIFO0, &RxMessage);
CAN_FIFORelease(CAN_FIFO0);

  return RxMessage.Data[0];
}

-------------------------------------

main()
{
   unsigned int a;
   RCC_Configuration();
         /*初始化 GPIOC时钟*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
USART_Configuration();
CAN_configure();
LedInit();

while(1)
{
   GPIO_SetBits(GPIOB,GPIO_Pin_7);
Delay(10);
GPIO_ResetBits(GPIOB,GPIO_Pin_7);
Delay(10);
can_send(0x54);
a=can_rev();
USART1_Putc(a);

}

}

只看该作者 · 2011-7-21 13:01

软件配置不能一样，ID一样的话就不停仲裁失败了

只看该作者 · 2011-7-21 18:05

3# Itachi80

你说的也是一个问题，不过我按照一个循环发送，一个循环接收也不行。。。

发送成功才会进行下次发送，一直不发送成功。