1 files changed, 110 insertions, 0 deletions
diff --git a/openpicc/application/tc_cdiv_sync.c b/openpicc/application/tc_cdiv_sync.c
new file mode 100644
index 0000000..486e93b
--- /dev/null
+++ b/openpicc/application/tc_cdiv_sync.c
@@ -0,0 +1,110 @@
+/* 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"
+
+#define USE_IRQ
+
+static u_int8_t enabled;
+
+#if 0
+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("");
+}
+
+#else
+
+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) {
+		u_int32_t tmp = *AT91C_PIOA_ISR;
+		(void)tmp;
+		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_ID_PIOA,
+			      AT91C_AIC_PRIOR_HIGHEST, 
+			      AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, (THandler)&cdsync_cb);
+#else
+	/* Configure FIQ */
+	AT91F_AIC_ConfigureIt(AT91C_ID_FIQ,
+			      //0, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &cdsync_cb);
+			      0, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, (THandler)&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_ID_PIOA);
+
+	tc_cdiv_sync_disable();
+}