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

[Erwan03]

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?

[SofLit]

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? 

[Erwan03]

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.