STM CircleOS forum / OBD2-CAN using STM32 !

himas88 · 2011-12-04 13:50:32

Hello everybody !

Sorry my English. I have a problem in my project. I don't connect my Tool with ECU using OBD 2.

I check my CAN network . It's OK.

To connect ECU, First I send a mesage bellow :

Code:

#define PID_REQUEST         0x7DF 
#define PID_REPLY   0x7E8    

// initialise message to send    
CAN_TxMsg.id = PID_REQUEST;    // 0x7DF  
CAN_TxMsg.len = 8; 
CAN_TxMsg.format = STANDARD_FORMAT; 
CAN_TxMsg.type = DATA_FRAME; 
while (1) { 
test=0 ;                          
if (CAN_TxRdy) { 
CAN_TxRdy = 0;          

CAN_TxMsg.data[0] = 0x02;                    
 CAN_TxMsg.data[1] = 0x01; 
CAN_TxMsg.data[2] = pid ; // PID's need to get 
CAN_TxMsg.data[3] = 0x00; 
CAN_TxMsg.data[4] = 0x00; 
CAN_TxMsg.data[5] = 0x00; 
CAN_TxMsg.data[6] = 0x00; 
CAN_TxMsg.data[7] = 0x00;                 
CAN_wrMsg (&CAN_TxMsg); 
CAN_wrMsg (&CAN_TxMsg); // transmit message    
}    
delay (100000);    // waiting CAN transmit about 500ms.

After , I wait Receive Interrupt... and ECU don't receive data.

This my program :

Code:

if (CAN_RxRdy) {
            CAN_RxRdy = 0;            
            test = CAN_RxMsg.data[0];
        }
    
        if (test==0x02)
        {
            /* Turn on led connected to GPIO_LED pin9 (LD4) */
        
            GPIO_WriteBit(GPIOC, GPIO_Pin_11, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_11)));
        }
                else
        {
            GPIO_WriteBit(GPIOC, GPIO_Pin_4, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_4)));    
        }

    } // end while

In this code, I check Receiver Interupt, If it occurt, LED in PC11 or PC4 isTOOGLE. If not,both LED in PC11 and PC4 is TOOGLE.

Thank everyone !

Last edited by himas88 (2011-12-04 13:54:37)

repzak · 2012-03-02 11:57:12

Hi,

Any progress on this?, i maybe want to run same project?

Matthias · 2012-03-13 15:44:16

what you prefer German or English

What kind of primer 1 2?
Primer 1 : http://www.stm32circle.com/projects/project.php?id=116
Primer 2 : http://www.stm32circle.com/projects/project.php?id=113

Possible causes:
Incorrect baud rate
CAN_InitStructure.CAN_Prescaler = 4;
CAN_InitStructure.CAN_BS1 = 8;
CAN_InitStructure.CAN_BS2 = 7;

Incorrect filter set:
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 = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;

not interrupt enabled
NVIC_InitTypeDef NVIC_InitStructure;
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);

Last edited by Matthias (2012-03-13 15:51:24)

jorgea · 2012-03-20 19:12:31

Have you seen any success in this yet?

# 1 2011-12-04 13:50:32 OBD2-CAN using STM32 !

OBD2-CAN using STM32 !

Code:

Code:

# 2 2012-03-02 11:57:12 OBD2-CAN using STM32 !

Re: OBD2-CAN using STM32 !

# 3 2012-03-13 15:44:16 OBD2-CAN using STM32 !

Re: OBD2-CAN using STM32 !

# 4 2012-03-20 19:12:31 OBD2-CAN using STM32 !

Re: OBD2-CAN using STM32 !

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