Hi Andrew, Thanks for your quickly response. >> Hello, In the ecos at91 spi device driver,the chip select pin of SPI is >> configured in GPIO mode. > > This is done because of silicon bugs in some AT91 devices. The > incorrect select pin is used when the SPI core drives the pin. Hence > the use of GPIO, which is always right. > > Check the Errata for the device you are using. See if it also has the > silicon bug. >
You are right,it is a bug for the at91 devices.But I use the at91sam9261 board,which support the current transfer and next transfer in the DMA mode. If I use the current transfer for the operation command ,and the next transfer for the datas which should be transfered. I think this would avoid the bug ,and use the SPI in CS mode with 'PDC'. qiulinyuan -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
