慕风yh 发表于 2015-1-23 09:22:12

求教STM32F4can调试经验


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

feel-376797 发表于 2015-1-23 09:31:58

两个节点加120欧姆电阻。

stary666 发表于 2015-1-23 09:38:04

:D:D:D:D:D:D:D

慕风yh 发表于 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_FilterInitTypeDefCAN_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;

zhangdaijin 发表于 2015-1-23 16:00:14

等大神出现

慕风yh 发表于 2015-1-23 19:07:08

zhangdaijin 发表于 2015-1-23 16:00
等大神出现

还没有大神出现。。。
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