stm32的can问题太多了

bfy520

stm32的can问题太多了 [复制链接]

1.正常模式输出引脚没有信号
2.使用fifo1中断接受，根本不进中断，
3，列表模式lookback也巡行不对
我以前发过很多can的帖子
不知道为什么没有一个st的人出来回答是回避还是？
能不鞥给的例程多一点，资料太少了

xingaodu

sunyaping123

在万利板上要 Remap 一下，因为管脚不在默认状态

ljysyn

还有我上面说的那些问题
如果没问题，能否提供一个对接can互传成功的
还有就是fifo1中断接受成功的

fishingnet001

taotao39329112

该代码是轮询模式，你将中断开启，在中断中处理相关操作就可以。

/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
    debug();
#endif

    RCC_Configuration();        // System Clocks Configuration
    NVIC_Configuration();        // NVIC Configuration
    GPIO_Configuration();        // GPIO ports pins Configuration

    TestRx = CAN_Polling();        // CAN transmit at 100Kb/s and receive by polling in loopback mode

    if (TestRx == FAILED) {
        GPIO_SetBits(GPIOC, GPIO_Pin_4);        // Turn on led connected to PC.08 pin (LD3)
    }
    else {
        GPIO_SetBits(GPIOC, GPIO_Pin_6);        // Turn on led connected to PC.06 pin (LD1)
    }

    while (1) { }
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
    RCC_DeInit();    /* RCC system reset(for debug purpose) */
    RCC_HSEConfig(RCC_HSE_ON);    /* Enable HSE */
    HSEStartUpStatus = RCC_WaitForHSEStartUp();    /* Wait till HSE is ready */
    if(HSEStartUpStatus == SUCCESS) {
        FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);        /* Enable Prefetch Buffer */
        RCC_HCLKConfig(RCC_SYSCLK_Div1);         /* HCLK = SYSCLK */
        RCC_PCLK2Config(RCC_HCLK_Div1);     /* PCLK2 = HCLK */
        RCC_PCLK1Config(RCC_HCLK_Div2);        /* PCLK1 = HCLK/2 */
        RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);        /* Select HSE as system clock source */
        while(RCC_GetSYSCLKSource() != 0x04) {        // Wait till HSE is used as system clock source
        }
    }

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);    /* GPIOA and GPIOC clock enable */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);    /* CAN Periph clock 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;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);        /* Configure PC.06, PC.07, PC.08 and PC.09 as Output push-pull */

    /* Enable the USART2 Pins Software Remapping */
    GPIO_PinRemapConfig(GPIO_Remap2_CAN, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOD, &GPIO_InitStructure);        /* Configure CAN pin: RX */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);        /* Configure CAN pin: TX */
}

/*******************************************************************************
* 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
    NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);            /* Set the Vector Table base location at 0x20000000 */
#else    /* VECT_TAB_FLASH  */
    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);        /* Set the Vector Table base location at 0x08000000 */
#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)
{
    u8 Error;

    CAN_InitTypeDef        CAN_InitStructure;
    CAN_FilterInitTypeDef  CAN_FilterInitStructure;
    CanTxMsg TxMessage;

    u32 i = 0;
    u8 TransmitMailbox;

    /* 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_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 = 5;
    Error = CAN_Init(&CAN_InitStructure);
    if (Error == 0)
        return FAILED;

    /* 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;    //0;
    CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
    CAN_FilterInit(&CAN_FilterInitStructure);

    /* transmit */
    TxMessage.StdId = 0x18;
    TxMessage.RTR = CAN_RTR_DATA;
    TxMessage.IDE = CAN_ID_STD;
    TxMessage.DLC = 8;
    TxMessage.Data[0] = 0x40;
    TxMessage.Data[1] = 0x40;
    TxMessage.Data[2] = 0x45;
    TxMessage.Data[3] = 0x51;
    TxMessage.Data[4] = 0x52;
    TxMessage.Data[5] = 0x65;
    TxMessage.Data[6] = 0x61;
    TxMessage.Data[7] = 0x64;        // @@EQRead

    TransmitMailbox = CAN_Transmit(&TxMessage);

    i = 0;
    while((CAN_TransmitStatus(TransmitMailbox) != CANTXOK) && (i != 0xFF)) {
        i++;
    }

    return PASSED;        // Test Passed
}

iC92

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
    RCC_DeInit();                                    // RCC system reset(for debug purpose)
    RCC_HSEConfig(RCC_HSE_ON);                        // Enable HSE
    HSEStartUpStatus = RCC_WaitForHSEStartUp();        // Wait till HSE is ready
    if(HSEStartUpStatus == SUCCESS) {
        FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);        // Enable Prefetch Buffer
        RCC_HCLKConfig(RCC_SYSCLK_Div1);             // HCLK = SYSCLK
        RCC_PCLK2Config(RCC_HCLK_Div1);             // PCLK2 = HCLK
        RCC_PCLK1Config(RCC_HCLK_Div2);                // PCLK1 = HCLK/2
        RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);        // Select HSE as system clock source
        while(RCC_GetSYSCLKSource() != 0x04) {        // Wait till HSE is used as system clock source
        }
    }

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);    /* GPIOA and GPIOC clock enable */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);    /* CAN Periph clock 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;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);            // Configure PC.06, PC.07, PC.08 and PC.09 as Output push-pull

    GPIO_PinRemapConfig(GPIO_Remap2_CAN, ENABLE);    // Enable the USART2 Pins Software Remapping

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOD, &GPIO_InitStructure);            // Configure CAN pin: RX

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);            // Configure CAN pin: TX
}

/*******************************************************************************
* Function Name  : CAN_Configuration
* Description    : Configures the CAN
* Input          : None
* Output         : None
* Return         : PASSED if the configration is well done, FAILED in other case
*******************************************************************************/
TestStatus CAN_Configuration(void)
{
    u8 Error;
    CAN_InitTypeDef        CAN_InitStructure;
    CAN_FilterInitTypeDef  CAN_FilterInitStructure;

    CAN_DeInit();            // CAN register init
    CAN_StructInit(&CAN_InitStructure);

    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;
    Error = CAN_Init(&CAN_InitStructure);        // CAN cell init

    if (Error == 0)
        return FAILED;

    CAN_FilterInitStructure.CAN_FilterNumber = 0;
    CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
    CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
    CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0300;        // StdId << 20 | ExID << 2 | IDE << 1 |    RTR
    CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;        // StdId << 20 | ExID << 2 | IDE << 1 |    RTR
    CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0300;
    CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
    CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
    CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
    CAN_FilterInit(&CAN_FilterInitStructure);    // CAN filter init

    return PASSED;
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
    CanRxMsg RxMessage;
    u32 i = 0;

#ifdef DEBUG
    debug();
#endif

    RCC_Configuration();            // System Clocks Configuration
    NVIC_Configuration();            // NVIC Configuration
    GPIO_Configuration();            // GPIO ports pins Configuration

    do {
        TestRx = CAN_Configuration();    // CAN transmit at 100Kb/s and receive by polling in loopback mode
    } while (TestRx == 0);

    /* receive */
    RxMessage.StdId = 0x00;
    RxMessage.IDE = CAN_ID_STD;
    RxMessage.DLC = 0;
    for (i = 0; i < 8; i++) {
        RxMessage.Data = 0x00;
    }

    while (1) {
        if (CAN_MessagePending(CAN_FIFO0)) {
            CAN_Receive(CAN_FIFO0, &RxMessage);
            TestRx = PASSED;
            if (RxMessage.StdId!=0x11)
                TestRx = FAILED;

            if (RxMessage.IDE!=CAN_ID_STD)
                TestRx = FAILED;

            if (RxMessage.DLC!=2)
                TestRx = FAILED;

            if ((RxMessage.Data[0] << 8 | RxMessage.Data[1]) != 0xCAFE)
                TestRx = FAILED;

            if (TestRx == FAILED) {
                GPIO_SetBits(GPIOC, GPIO_Pin_4);        // Turn on led connected to PC.08 pin (LD3)
            }
            else {
                GPIO_SetBits(GPIOC, GPIO_Pin_6);        // Turn on led connected to PC.06 pin (LD1)
            }
        }
    }
}

xi19871208

节点数为1时,如果不用回环模式,是咱都不会正常的.

lai236

但是在我这里为什么发送端用示波器就没有信号呢。还有两个can之间相连，硬件有什么要求吗还有就是我就随便两个单独的线可以吧

zxioy

两个CAN节点相连，终端电阻匹配了没有？

ylwhut111

并联了电阻对于硬件连接还请您指点

merryimage

xw0326

如果lookback下能用示波器看到信号就没有问题的

在正常模式下看不到信号,应该是总线错误导致bus off了

你要保证在任何时刻下总线至少有两个"有效"的can设备,可以应答对方,要不然发255次就bus off了.而且这255次发送是自动尝试的,只要你启动一次发送而收不到应答

你可以调试一下,检查can有关寄存器,看是不是bus off了
另外在第一次发送的时候,你可以用示波器看到波形的,但是很快就没有了,也不能再发送了,因为已经bus off了.

总之lookback下能用示波器看到信号就说明没有问题

sanzhongren

还有一个问题硬件连接有什么要求吗电阻之类的

bingshan1129

高速型的好像两个不够?

yongle_2005

remap以后一定要RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE); 开下RCC_APB2Periph_AFIO时钟

kuang_xiang

我只有带can的开发板两个怎么调试呢对连不可以吗

tfgzs

不是芯片的问题.CAN调试的正常模式需要至少两个节点.难道LZ连CAN协议都没看过就开始动手了?

fanxuxu

能指点一下怎么调试吗要几个can 硬件有什么要求？

shhuikun

两个板就可以了

调试的话硬件没什么很严格的要求啊,连起来就可以了

把波特率设置低一点

你首先在loopback模式单独调好每块板(能正常收发),然后连起来切到正常模式就可以了,要记得波特率相同,要不又bus off了

stm32的can问题太多了 [复制链接]

最新回复

芯片没问题

芯片没问题

这个当然知道 lookback有信号正常模式就没信号了

stm

STM32发送测试代码，可以运行

接收测试代码

CAN有个特点

我想知道这个是你测试过了的吧应该

如果不是自测模式，似乎发送引脚应该没有信号

为什么正常模式会没有信号呢？

ding上来

re

谢谢楼上

两个设备是指用的容错型CAN吧?

问题可能没remap

我迷茫了请教调试can的方法

很明显

请教楼上

re

stm32的can问题太多了 [复制链接]

最新回复

芯片没问题

芯片没问题

这个当然知道 lookback有信号 正常模式就没信号了

stm

STM32发送测试代码，可以运行

接收测试代码

CAN有个特点

我想知道 这个是你测试过了的吧应该

如果不是自测模式，似乎发送引脚应该没有信号

为什么正常模式 会没有信号呢？

ding上来

re

谢谢 楼上

两个设备是指用的容错型CAN吧?

问题可能没remap

我迷茫了 请教调试can的方法

很明显

请教楼上

re

这个当然知道 lookback有信号正常模式就没信号了

我想知道这个是你测试过了的吧应该

为什么正常模式会没有信号呢？

谢谢楼上

我迷茫了请教调试can的方法