[En-Nut-Discussion] STM32F2 status

Henrik Maier hmnews at proconx.com
Mon Jan 28 13:43:48 CET 2013

On 28/01/2013 9:42 PM, Uwe Bonnes wrote:
> line 877 up to 948 of stm32_emac.c contain a big block of pin mapping
> operations.  Is this block missing for you or are there errors?

Hello Uwe,

Sorry. That is there indeed. I got confused as I have the BGA part which 
is using port G for some signals, a configuration which is not yet 
supported (but should be easy to add).

The challenge is now, how to configure the various combinations of 
alternate PIN configurations. Quite a few of the Ethernet signals can be 
mapped to different pins on an individual basis. Can you recommend a 
best practise here to follow?

Something like:

    GPIO_PinAFConfig((GPIO_TypeDef*) NUTGPIO_PORTG, 13,  GPIO_AF_ETH);
    GPIO_PinAFConfig((GPIO_TypeDef*) NUTGPIO_PORTB, 12,  GPIO_AF_ETH);

This issue also applies to other drivers like the UART and CAN were each 
individual signal can be mapped to at least two different pins.

Also wondering if the EMAC driver should use GPIO_CFG_SPEED_HIGH rather 
GPIO_CFG_SPEED_FAST as it should be 100 MHZ pin speed I think. At least 
this is what ST's driver is using.

Thank you for your assistance.



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