I have I problem writing to the spi controller of daVinci .I have four
bytes I want to send on the bus using 8-bits words, but I only get the
first out of the dm6446. Here is the routine I'm using in a kernel
module. I think I'm missing some kind of synchronization but I don't
understand what.
Can you give me a hint please?
static int
spimem_write (char *data, size_t size)
{
int i;
unsigned long control;
for (i = 0; i < size; i++)
{
control = SPIDAT1_CSNR (0) | SPIDAT1_CSHOLD;
control |= data[i];
SPI_REG (SPIDAT1) = control;
control = SPI_REG (SPIBUF);
if (control & SPIBUF_RX_EMPTY)
printk (KERN_INFO "no data received\n");
else
{
while (1)
{
control = SPI_REG (SPIBUF);
if (control & SPIBUF_TXFULL)
continue;
else
break;
printk (KERN_INFO "wait for data\n");
}
printk ("data: %04X\n", control & 0x0000FFFF);
}
}
return i;
}
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