I CANT RECEİVE ANY MESSAGE FROM A CAN BUS ANALYZER WİTH STM32 BOARD

[maZers]

Hello,

I am using stm32F407VGT board and I am trying to receive data from a can analyzer with stm32 board. I transmit a data to stm32 boards but ı cant receive the messages. I can work on normal mode with two stm32 boards succesfully. The messages are received and transmitted. At the same time, I want to transmit data to can analyzer and I want to observe communication. I attached my main and interrupt source files and I am using USB-CAN analyzerV8 device. The can bps values are the same 500kbps. The modes are same as Normal Mode and I dont define a filter so ı can read every data that ı sent from can analyzer  in live expression on debug screen.

Summarize,

All my purpose, I want to see data that ı sent from can analyzer in my live expression part. I am sending one message fisrtly so there is a one Id.

[maZers]

By the way, If  my can transciever circuit mcp2551 is wrong, How can I communicate with two stm32 board ? Could you show me an example transciever circuit with MCP2551 ? I will use that  

[SofLit]

See this thread the picture shared by the community member on his first post.

[maZers]

Thank you 

I changed the terminal resistor with 120ohm on my can circuit and It still doesnt work. I cant understand my boards can communicate but why the analyzer can't ? I attached my can transciever circuit . I changed 60 ohm with 120ohm 

[SofLit]

It seems you used "Test circuit" description for your project while this is not the right config:

So is that possible to:

1. Remove the following capacitors?:
   • The one connected between CAN_H and CAN_L
   • The one connected to Rx pin
2. Remove the 2.2Kohm resistor and connect RS pin to the ground

[maZers]

I tried but it still doesnt work :( I dont know where is the problem. I removed the capacitors except connected +5V one and I connect 120 ohm terminal resistor 

I attached my code again. I used callback funcitons this time.

My software purpose's is the received message writed in rcount variable and this data is 1 bit.

[Karl Yamashita]

You should check for HAL status when HAL_CAN_Start, HAL_CAN_ActivateNotification and 

HAL_CAN_ConfigFilter  are called. Make sure they all return HAL_OK. This way we can eliminate an initialization error, if any.

In the Error_Handler you can turn on an LED to indicate any of those 3 calls did not return HAL_OK.

  if (HAL_CAN_ConfigFilter(&CanHandle, &sFilterConfig) != HAL_OK)
  {
    /* Filter configuration Error */
    Error_Handler();
  }

  /*##-3- Start the CAN peripheral ###########################################*/
  if (HAL_CAN_Start(&CanHandle) != HAL_OK)
  {
    /* Start Error */
    Error_Handler();
  }

  /*##-4- Activate CAN RX notification #######################################*/
  if (HAL_CAN_ActivateNotification(&CanHandle, CAN_IT_RX_FIFO0_MSG_PENDING) != HAL_OK)
  {
    /* Notification Error */
    Error_Handler();
  }

[maZers]

thank you for reply

I will try this codes but I have a question 

If I change my can transciever IC MCP2551 with TJA1051,  Can it be better?

Which can transciever IC do you suggest? 

[SofLit]

Hello,

If I want to suggest a transceiver, I would choose either a transceiver with 3.3V supply like the ones used on our boards Ex: SN65HVD230.

Or a transceiver having Vio pin like TJA1051T/3 or TJA51TK/3 versions.

The transceivers TJA1051 and TJA1051T/E versions are not suitable for you because VIHmin = 0.7xVCC = 3.5V (if VCC=5V). So TX pin needs at least 3.5V > STM32 IO voltage (@3.3V).

MCP2551 still not bad because VIHmin = 2V < 3.3V

[maZers]

Hello again,

I readjusted my mcp2551 can transciever circuit and my codes. I attached them. But It still doenst work guys. The prgoram is not getting in canrxfifo ınterrupt function or I cant transmit data to analyzer. Maybe, the analyzer sends hex codes not decimal so can I read hex code data in my live expression panel ? I mean, should I decode  the data in my codes ? 

[Karl Yamashita]

Attach your project. Draw up a diagram on how you've connected the MCP2551 to the STM32. How you've connected the CAN analyzer to the MCP2551, including power supply, USB connector(s) and grounds.