On 04/01/13 16:21, Jack Mitchell wrote:
On 04/01/13 14:46, Jan Lübbe wrote:
Hi,
On Tue, 2012-12-11 at 17:02 +0000, Jack Mitchell wrote:
On 11/12/12 16:24, Jack Mitchell wrote:
On 11/12/12 15:22, Ben Gamari wrote:
Jack Mitchell <ml@xxxxxxxxxxxxxxxxxxx> writes:
Thank you, the reordering dma patch fixed the dma issue I was
having!
However, the bad news, I now get the same results for the dma and
non-dma spidev test. While the scope shows the SPI clk and data is
fine,
the reading from the program still shows 0x00 for all words.
Just to make sure this has been thought of: I've seen this sort of
behavior in the past when the CLK pin wasn't configured as an input.
*snip*
My bad! The jumper bridge had come loose, it works now! Yippee!
root@beaglebone:~# ./spidev -D /dev/spidev2.0
spi mode: 0
bits per word: 16
max speed: 24000000 Hz (24000 KHz)
FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
root@beaglebone:~#
Thanks everyone, and do I need to submit any patches to clear this
all up?
Currently all I see is changing the clk pins from output to input (if
this is a valid change?).
I just stumbled over the same problem and have not seen any patch for
this fix. Have I missed something or should I send a patch? Which would
be the correct base for such a patch?
Regards,
Jan
I didn't submit a patch for this but easily could. I was confused
about what tree to base it against as at the time (may still be the
same) DT SPI for AM335x was not in a mainline tree. I hoped someone
would pick it up when posting DT SPI for mainline....
I've just had confirmation from Matt Porter on IRC that this change will
be present in the next iteration of his DMA Engine series, which I
believe brings in the DT SPI support.
Cheers All,
Jack
--
Jack Mitchell (jack@xxxxxxxxxxx)
Embedded Systems Engineer
http://www.embed.me.uk
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