stm32f103c8 spl can, no tx impulse

[aneox]

Posted on February 11, 2015 at 07:01

Please, help me, i cant start CAN for a week.

I use stm32f103c8 + mcp2551, connected to car can bus. Receiving is working, i got packets in irq. But transmit is always pending. All mail boxes becomes pending. With logic analyser i can see incoming packets on PA11, but PA12 is always in HIGH. When i switch to loopback mode, i can recieve own message in interrupt, but PA12 is still always HIGH. I thought that car not respond with ack message, but it always should respond to my sending request(if it sended), no respond comming. init

void
CAN1_Config(
void
)

{

GPIO_InitTypeDef GPIO_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

CAN_InitTypeDef CAN_InitStructure;

CAN_FilterInitTypeDef CAN_FilterInitStructure;


NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);


NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);



RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE );


//CAN_RX

// GPIO_InitStructure.GPIO_Pin = GPIO_PinSource8; //PB8

// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

// GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_PinSource11; 
//PA11

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

GPIO_Init(GPIOA, &GPIO_InitStructure);


//CAN_TX

// GPIO_InitStructure.GPIO_Pin = GPIO_PinSource9; //PB9

// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

// GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_PinSource12; 
//PA12

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);


// GPIO_PinRemapConfig(GPIO_Remap1_CAN1 , ENABLE); //remap to PB8 PB9


RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

CAN_DeInit(CAN1);


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;

//500kbit

CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;

CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;

CAN_InitStructure.CAN_BS2 = CAN_BS2_2tq;

CAN_InitStructure.CAN_Prescaler = 12;

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_FIFO0;

CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;

CAN_FilterInit(&CAN_FilterInitStructure);



TxMessage.StdId = 0x321;

TxMessage.RTR = CAN_RTR_DATA;

TxMessage.IDE = CAN_ID_STD;

TxMessage.DLC = 8;


CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);

}

sending

TxMessage.StdId=PID_REQUEST;

TxMessage.RTR = CAN_RTR_DATA;

TxMessage.IDE = CAN_ID_STD;

TxMessage.DLC = 8;

TxMessage.Data[0] = 0x02;

TxMessage.Data[1] = 0x01;

TxMessage.Data[2] = ENGINE_COOLANT_TEMP;

TxMessage.Data[3] = 0x00;

TxMessage.Data[4] = 0x00;

TxMessage.Data[5] = 0x00;

TxMessage.Data[6] = 0x00;

TxMessage.Data[7] = 0x00;


do

{

transmit_mailbox = CAN_Transmit( CAN1, &TxMessage );

}

while
( transmit_mailbox =! CAN_NO_MB );


txStat1 = CAN_TransmitStatus(CAN1, 0);
//0x02 CAN_TxStatus_Pending

txStat2 = CAN_TransmitStatus(CAN1, 1);
//0x02 CAN_TxStatus_Pending

txStat3 = CAN_TransmitStatus(CAN1, 2);
//0x02 CAN_TxStatus_Pending


if
(txStat1 == CANTXOK || txStat2 == CANTXOK || txStat3 == CANTXOK)

ok = 1; //never

#stm32f103c8 #stm32f103 #can

[aneox]

Posted on February 11, 2015 at 11:16[solved]

GPIO_Pin_12  

GPIO_PinSource12