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.

[mƎALLEm · Accepted solution]

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 in 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.