Hi,

I'm writing my own optimized driver for USART in AT91SAM9260, working with PDC.
The problem I've faced is that after my initialization procedure (based on atmel_serial.c code from Linux) the USART+PDC does not generate interrupts, even though the external clock is connected to SCK2 and data stream is transmitted to RXD2.
It seems, that my initialization code (posted to viewtopic.php/f,12/t,20486/ ) does not turn on something essential...
Where can I find any sample code showing how to initialize USART (I need only the receiver part) together with PDC?
--
TIA & Regards,
Wojtek

Try doing it outside of Linux first.

Try doing it as a simple loop-back. You could do this on both the 9260 and PC/realterm, and confirm either is functioning as you expect.

The AT91SAM9M10-EK software release has a package for a synchronous serial port.

The slave configuration (ie taking clock as an input) is :

if(!isMaster){
mode = AT91C_US_USMODE_NORMAL | AT91C_US_CLKS_CLOCK
| AT91C_US_CHMODE_NORMAL
| AT91C_US_SYNC|AT91C_US_MSBF
| AT91C_US_CHRL_8_BITS | AT91C_US_NBSTOP_1_BIT| AT91C_US_PAR_EVEN;
}

Adjust the parity as appropriate

Unfortunately I can work with this board only from Linux.

However I've found the source of the problem:

I have to call:
clk_enable(clk_get(NULL,"usart2_clk"));

to get USART2 working.
--
Thanks & Regards,
Wojtek