ST意法半导体中文论坛求教STM32F4can调试经验

求教STM32F4can调试经验

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慕风yh 提问时间：2015-1-23 09:22 /

问答
是否解决:

本人最近在调试stm32f407的CAN，按照例程配置的，但是CAN没输出怎么回事?有人说是得两个节点接在一起才能有数据。。。有人调过么？能给点指导或者例程不，感激不尽

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5个回答

feel-376797 回答时间：2015-1-23 09:31:58

两个节点加120欧姆电阻。

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stary666 回答时间：2015-1-23 09:38:04

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慕风yh 回答时间：2015-1-23 14:54:14

feel-376797 发表于 2015-1-23 09:31
两个节点加120欧姆电阻。

这个电阻是加了的，但是还是不对，我的配置如下帮忙指教一下;
GPIO_InitTypeDef    GPIO_InitStructure;
CAN_InitTypeDef       CAN_InitStructure;
CAN_FilterInitTypeDef  CAN_FilterInitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource8,GPIO_AF_CAN1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource9,GPIO_AF_CAN1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

//CAN_DeInit(CAN1);
CAN_DBGFreeze(CAN1,DISABLE);
  CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
  //CAN_InitStructure.CAN_ABOM = ENABLE;
  CAN_InitStructure.CAN_AWUM = DISABLE;
  CAN_InitStructure.CAN_NART = DISABLE ;
  CAN_InitStructure.CAN_RFLM = DISABLE;
  CAN_InitStructure.CAN_TXFP = ENABLE;
  CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
  CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
  CAN_InitStructure.CAN_BS1 = CAN_BS1_12tq;
  CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
  CAN_InitStructure.CAN_Prescaler =2;
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_Filter_FIFO0;
  CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

TxMessage.StdId = 0x321;
  TxMessage.ExtId = 0x01;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.DLC = 8;

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