Thu, 16 Sep 2010 21:14:26 +0800 письмо от qiulinyuan <qlytia...@hotmail.com>:
> >Hello, In the ecos at91 spi device driver,the chip select pin of SPI is >configured in GPIO mode. >While I want to use the SPI in 'CS' mode with 'PDC' .Does >anyone have done this before? >I have modified the at91 SPI in 'CS' mode ,and use the current counter >and next counter for >the 'PDC'.And use the SPI to read and write a FRAM. >However the the modified driver couldn't work well.Some times the read and >write operation go >well .While other times not,only the first part of the datas which read from >the FRAM are right. Did you try without data cache? As I remember I try at91_spi.c for connection between at91sam9263 and SPI data flash. Because of this was just test for our custom board - "is SPI working or not", I just disable dcache and as I remember all works fine (PDC was used, not sure about GPIO vs real chip select). -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
