Gentlemen,
Have someone managed to get SPI on DaVinci working? I have a driver which
provides open/read/write/ioctl/close interface but I need help because it
has very strange bug. I can't understand its reason.
I am doing block write by:
- setting up correct chip select
- settings up CSHOLD on duration of whole transaction (whole buffer write)
- setting up correct format
- perform byte-by-byte write
- clear CS
- clear CSHOLD
Sometimes (!) byte-by-byte write subroutine fails.
It looks like:
SPIDAT1 = (config << 16 ) | data;
do
{
Result = SPIBUF;
} while(result & (1 << 29)) // check TXFULL bit
The failure is due infinite loop. Above mentioned loop never ends. It seems
that hardware can't transmit data!
Example values of my registers are (when I terminate this loop after several
seconds of waiting):
SPIDAT1 = 0x10020055 (I am writing 0x55)
SPIBUF = 0xA0000000
But If I put debugging output everywhere (printk .) it helps.
What is the problem?
Thanks.
Kirill
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