ColdFire/68K Microcontrollers and Processors中的主题 Re: 5475 FEC transmition problems

5475 FEC transmition problems

JOA2 — Mon, 18 Jan 2010 16:40:38 GMT

We are developing a port for MCF5475 for LLWIP and FreeRTOS.

With FreeRTOS no problems but now with MCF5475 we are not abble to transmit any data with FEC.

We can receiving datas properly but when try to send nothing happen.

We are not ussing DMA we have copy Linux initialization but does not work.

Has anybody a sample to transmit datas with MCF54xx?

Thank you in advance

Oscar Alegría

Re: 5475 FEC transmition problems

plattro — Sat, 04 Jun 2011 14:52:49 GMT

Hi Oscar,

Did you ever resolve this problem?

i'm curious since we have a FEC transmit problem, but for us it is usually fine then hangs sometimes.

Maybe your solution gives me some ideas on the problem we have.

Re: 5475 FEC transmition problems

JOA2 — Mon, 06 Jun 2011 13:24:43 GMT

It was imposible to transmit any using the FEC directly. I think there is any bad into FEC documentation. We started to use DMA to send and receive datas from DMA. There is an API (Multichannel_DMA_API) and it works nice.

It is not difficult to use it.

Try with it and if you have any problem, I will try to help you.

Re: 5475 FEC transmition problems

plattro — Tue, 07 Jun 2011 16:22:47 GMT

Hi Oscar

thanks

We are using the McDMA, it is mostly working very well. I never tried writing directly to the registers, I think at the end of the frame there's a control word and some other writes to the control register needed to mark the frame end. Seems complicated.

If you're curious, description of the problem I face is here:

https://community.freescale.com/thread/83532

Re: 5475 FEC transmition problems

PaoloRenzo — Wed, 08 Jun 2011 00:09:23 GMT

Hi Oscar

How did you port FreeRTOS to mcf547x/8x? Only reusing v2 ports? Can you share the port.c, portasm.s and portmacro.h? What compiler are you using?

Thanks