STM32F446RE: CAN hcan->State is always at listening state

Forum|Forum|1 year ago
August 29, 2024
1 reply
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Hello all,

I am working on a ECU system and using CAN protocol to communicate with peripheral.

The MCU i am using is a STM32F446re. I have a problem when trying to execute "HAL_CAN_Init(&hcan1)" function.

Indeed, the line "hcan->State = HAL_CAN_STATE_READY;" in this function, the State value becomes "HAL_CAN_STATE_LISTENING", "HAL_CAN_STATE_READY", although my PCB is link to the CAN bus.

Does anyone know how to fix it?

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Best answer by mƎALLEm

I could use the exact same configuration and program a few weeks ago.

This problem has never happened before, and is happening right now, although i did not touch to the configuration nor to the program.

Since your application worked before and you didn't modify it, I suspect something in your HW.

Please check all the CAN HW part and check the connections and the wires continuity, the transceiver power etc ..

M

mƎALLEm

Technical Moderator

Hello @Erwan03 ,

I didn't understand your issue.

Mainly this statement:

Indeed, the line "hcan->State = HAL_CAN_STATE_READY;" in this function, the State value becomes "HAL_CAN_STATE_LISTENING", "HAL_CAN_STATE_READY", although my PCB is link to the CAN bus.

Could you please rephrase and give more details about the HW? provide schematics?

E

Erwan03Author

Graduate

ok sorry let me be explain myself.

Here is the schematic of my ECU prototype. I am using the CAN protocol to communicate with peripheral in the car.

The PCU on schem represents the F446RE

When i connect this guy onto the CAN bus, after setting the CAN transmission speed, setting the normal mode and enabling the interrupts, i am trying to debug my program.

Everything is fine until i reach the function of initialization of CAN "HAL_CAN_Init(&hcan1)". In this function, at the end, before the return value, the hcan->State variable should be set as "HAL_CAN_STATE_READY". This is ok but when i reach that line : "hcan->State = HAL_CAN_STATE_READY;" the expression of window shows me that the value is not set as HAL_CAN_STATE_READY, as expected, but as HAL_CAN_STATE_LISTENING. I don't know the reason.

Furthermore, here is the setting of the CAN on the .ioc file.