STM32C092FCP6 FDCAN remapping issue.

[JennyDigital]

I designed a board with a layout that I was very happy with, but this meant remapping FDCAN1_TX to PC14, which CubeMX dutifully created code for...

However, the code wouldn't compile.  I needed to get my board order in that day so I simply adjusted the pin arrangement and modified the layout, but it looks for all the world as though there are some missing defines.  I say this because the datasheet quite clearly states this as a valid remapping.

Just thought I'd put this out there.

Maybe the fix is as simple as:-

#define GPIO_AF13_FDCAN1 13

I may revisit this in the near future and I am aware there are some other remapping issues others have tripped up on.  I guess it's because this is a relatively new part.  It only came out in Feb 2025.

Does anybody else know anything about this issue?

[loveforcircuits]

Updating CubeMX packages may eventually resolve everything automatically.. 

[JennyDigital]

I agree, though there are literally thousands of STM32 parts, so I'll give them extra time before just fixing it myself.  That's totally fair.

[JennyDigital]

It just occurred to me... The speed and manner with which this is being handled is AWESOME!  Thank you ??

[mƎALLEm]

You're welcome

[mƎALLEm]

Hello  @JennyDigital  and thank you for raising that issue.

That doesn't seem to be an issue in CubeMx but rather a missing definition in the HAL.

CubeMx is just using HAL as is.

The current definitions on AF13 in stm32c0xx_hal_gpio_ex.h are as following:

/**
* @brief
AF 13 selection
*/ #define GPIO_AF13_TIM14
((uint8_t)0x0D)  /*!< TIM14 Alternate Function mapping */ #define GPIO_AF13_TIM3
((uint8_t)0x0D)  /*!< TIM3 Alternate Function mapping */

Indeed GPIO_AF13_FDCAN1 is missing in the definition list.

I'll escalate the issue internally for check and fix.

Edit: after checking:

In the GitHub link, FDCAN1 AF13 is defined at line 259:

/**
* @brief
AF 13 selection
*/ #define GPIO_AF13_TIM14
((uint8_t)0x0D)  /*!< TIM14 Alternate Function mapping */ #define GPIO_AF13_TIM3
((uint8_t)0x0D)  /*!< TIM3 Alternate Function mapping */ #if defined(FDCAN1) #define GPIO_AF13_FDCAN1
((uint8_t)0x0D)  /*!< FDCAN1 Alternate Function mapping */ #endif /* FDCAN1 */

And I think there is a mismatch between Github and the C0 Cube (V1.4.0) zip file here.

Internal ticket: CDM0062895 to check the propagation of the fix in the zip file.