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/* Synchronize TC_CDIV divided sample clock with the SOF of the packet */
#include <lib_AT91SAM7.h>
#include <AT91SAM7.h>
#include "dbgu.h"
#include "pio_irq.h"
#include "openpicc.h"
#include "led.h"
#define USE_IRQ
static u_int8_t enabled;
static void pio_data_change(u_int32_t pio)
{
(void)pio;
DEBUGP("PIO_FRAME_IRQ: ");
/* we get one interrupt for each change. If now, after the
* change the level is high, then it must have been a rising
* edge */
if (*AT91C_PIOA_PDSR & OPENPICC_PIO_FRAME) {
*AT91C_TC0_CCR = AT91C_TC_SWTRG;
DEBUGPCR("CDIV_SYNC_FLIP SWTRG CV=0x%08x",
*AT91C_TC0_CV);
} else
DEBUGPCR("");
vLedSetGreen(0);
}
void tc_cdiv_sync_reset(void)
{
if (enabled) {
u_int32_t tmp = *AT91C_PIOA_ISR;
(void)tmp;
volatile int i;
DEBUGPCRF("CDIV_SYNC_FLOP");
vLedSetGreen(1);
/* reset the hardware flipflop */
AT91F_PIO_ClearOutput(AT91C_BASE_PIOA,
OPENPICC_PIO_SSC_DATA_CONTROL);
for (i = 0; i < 0xff; i++) ;
AT91F_PIO_SetOutput(AT91C_BASE_PIOA,
OPENPICC_PIO_SSC_DATA_CONTROL);
}
}
void tc_cdiv_sync_disable(void)
{
enabled = 0;
*AT91C_PIOA_IDR = OPENPICC_PIO_FRAME;
}
void tc_cdiv_sync_enable(void)
{
enabled = 1;
DEBUGPCRF("CDIV_SYNC_ENABLE ");
tc_cdiv_sync_reset();
*AT91C_PIOA_IER = OPENPICC_PIO_FRAME;
}
extern void (*fiq_handler)(void);
void tc_cdiv_sync_init(void)
{
DEBUGPCRF("initializing");
enabled = 0;
AT91F_PIOA_CfgPMC();
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SSC_DATA_CONTROL);
pio_irq_register(OPENPICC_PIO_FRAME, &pio_data_change);
AT91F_AIC_EnableIt(AT91C_ID_PIOA);
vLedSetGreen(0);
tc_cdiv_sync_disable();
}
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