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/* Synchronize TC_CDIV divided sample clock with the SOF of the packet */
#define PIO_DATA AT91C_PIO_PA27
#include <lib_AT91SAM7.h>
#include <AT91SAM7.h>
#include <os/dbgu.h>
#include "../openpcd.h"
//#define USE_IRQ
#define DISABLE
static u_int8_t enabled;
static void pio_data_change(u_int32_t pio)
{
DEBUGPCRF("PIO=%d", pio);
if (pio != 27)
return;
/* FIXME: start ssc if we're in one-shot mode */
//ssc_rx_start();
}
static void __ramfunc cdsync_cb(void)
{
if (*AT91C_PIOA_ISR & PIO_DATA) {
/* we get one interrupt for each change. If now, after the
* change the level is low, then it must have been a falling
* edge */
if (*AT91C_PIOA_PDSR & PIO_DATA) {
*AT91C_TC0_CCR = AT91C_TC_SWTRG;
DEBUGP("SWTRG CV=0x%08x ", *AT91C_TC0_CV);
#ifdef DISABLE
DEBUGP("CDIV_SYNC_FLIP ");
*AT91C_PIOA_IDR = PIO_DATA;
#endif
//ssc_rx_start();
}
}
#if 0
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_FIQ);
#endif
DEBUGPCR("");
}
/* re-enable cdiv_sync FIQ after it has been disabled by our one-shot logic */
void tc_cdiv_sync_reset(void)
{
#ifdef DISABLE
if (enabled) {
u_int32_t tmp = *AT91C_PIOA_ISR;
DEBUGP("CDIV_SYNC_FLOP ");
*AT91C_PIOA_IER = PIO_DATA;
}
#endif
}
void tc_cdiv_sync_disable(void)
{
enabled = 0;
*AT91C_PIOA_IDR = PIO_DATA;
}
void tc_cdiv_sync_enable(void)
{
enabled = 1;
DEBUGP("CDIV_SYNC_ENABLE ");
tc_cdiv_sync_reset();
}
extern void (*fiq_handler)(void);
void tc_cdiv_sync_init(void)
{
DEBUGPCRF("initializing");
enabled = 0;
AT91F_PIOA_CfgPMC();
#ifdef USE_IRQ
/* Configure IRQ */
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_PIOA,
AT91C_AIC_PRIOR_HIGHEST,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &cdsync_cb);
#else
/* Configure FIQ */
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_FIQ,
//0, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &cdsync_cb);
0, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &fiq_handler);
/* enable fast forcing for PIOA interrupt */
*AT91C_AIC_FFER = (1 << AT91C_ID_PIOA);
/* register pio irq handler */
pio_irq_register(PIO_DATA, &pio_data_change);
#endif
AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
tc_cdiv_sync_disable();
}
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