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/* Synchronize TC_CDIV divided sample clock with the SOF of the packet */
#include <lib_AT91SAM7.h>
#include <AT91SAM7.h>
#include <os/dbgu.h>
#include "../openpcd.h"
//#define USE_IRQ
static uint8_t enabled;
static void pio_data_change(uint32_t 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("");
}
#if 0
static void __ramfunc cdsync_cb(void)
{
DEBUGP("PIO_IRQ: ");
if (*AT91C_PIOA_ISR & OPENPICC_PIO_FRAME) {
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("");
} else
DEBUGPCR("");
}
#endif
void tc_cdiv_sync_reset(void)
{
if (enabled) {
uint32_t tmp = *AT91C_PIOA_ISR;
volatile int i;
DEBUGPCRF("CDIV_SYNC_FLOP");
/* 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();
#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(OPENPICC_PIO_FRAME, &pio_data_change);
#endif
AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
tc_cdiv_sync_disable();
}
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