On 6/25/07, Frank Mandarino fmandarino@endrelia.com wrote:
Paul Kavan wrote:
Hello all:
I have been struggling to determine why the sync line (TF0) behaves so strangely when in capture mode yet acts fine in playback mode. So far,
no
real clues. However, I do have a few questions. I have DATADEF set for
TD0
set to 1. However, at the end of a playback it pulls to zero. Any clue
why
this might be happening?
Perhaps it is due to the SSC being reset when the playback channel is closed?
Yes, that is probably the cause. Thanks.
Also, in the machine code, I set up some test code to printk back the gpio
registers:
the code for the gpio is given as
#define AT91_PIO_TK0 (1 << (AT91_PIN_PB16 - PIN_BASE) % 32) #define AT91_PIO_TF0 (1 << (AT91_PIN_PB17 - PIN_BASE) % 32) #define AT91_PIO_TD0 (1 << (AT91_PIN_PB18 - PIN_BASE) % 32) #define AT91_PIO_RD0 (1 << (AT91_PIN_PB19 - PIN_BASE) % 32) #define AT91_PIO_RK0 (1 << (AT91_PIN_PB20 - PIN_BASE) % 32) #define AT91_PIO_RF0 (1 << (AT91_PIN_PB21 - PIN_BASE) % 32) . . . ssc_pio_lines = AT91_PIO_TF0 | AT91_PIO_TK0 | AT91_PIO_TD0 | AT91_PIO_RD0 /*| AT91_PIO_RK0 | AT91_PIO_RF0*/ ;
printk("SSC PIO LINES is 0x%x\n",ssc_pio_lines);/* Reset all PIO registers and assign lines to peripheral A */ at91_sys_write(AT91_PIOB + PIO_PDR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_ODR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_IFDR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_CODR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_IDR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_MDDR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_PUDR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_ASR, ssc_pio_lines); at91_sys_write(AT91_PIOB + PIO_OWDR, ssc_pio_lines);
/*TEST CODE*/ printk("PIOB-PDR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_PDR)); printk("PIOB-ODR is set to %d\n",at91_sys_read(AT91_PIOB +
PIO_ODR));
printk("PIOB-IFDR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_IFDR));
printk("PIOB-CODR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_CODR));
printk("PIOB-IRD is set to %d\n",at91_sys_read(AT91_PIOB +PIO_IDR));
printk("PIOB-MDDR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_MDDR));
printk("PIOB-PUDR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_PUDR));
printk("PIOB-ASR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_ASR));
printk("PIOB-OWDR is set to %d\n",at91_sys_read(AT91_PIOB +PIO_OWDR));
/*END OF TEST CODE*/and the result at boot is:
AT91SAM9260EK W6811 Driver <1> w6811: W6811 PCM SoC Audio 0.1 asoc: W6811 <-> at91-ssc0 mapping ok SSC PIO LINES is 0xf0000 PIOB-PDR is set to 0 PIOB-ODR is set to 0 PIOB-IFDR is set to 0 PIOB-CODR is set to 0 PIOB-IRD is set to 0 PIOB-MDDR is set to 0 PIOB-PUDR is set to 0 PIOB-ASR is set to 0 PIOB-OWDR is set to 0
...why are all the registers set to 0?
These registers are all write-only registers. You have to read their corresponding status registers to see what values are set.
Is my face red? Missed that.....
../fam
-- Frank Mandarino fmandarino(a)endrelia.com Endrelia Technologies Inc. Toronto, Ontario, Canada