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-rw-r--r--firmware/src/picc/tc_cdiv_sync.c103
-rw-r--r--firmware/src/picc/tc_cdiv_sync.h5
2 files changed, 108 insertions, 0 deletions
diff --git a/firmware/src/picc/tc_cdiv_sync.c b/firmware/src/picc/tc_cdiv_sync.c
new file mode 100644
index 0000000..5762c2c
--- /dev/null
+++ b/firmware/src/picc/tc_cdiv_sync.c
@@ -0,0 +1,103 @@
+/* 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();
+}
diff --git a/firmware/src/picc/tc_cdiv_sync.h b/firmware/src/picc/tc_cdiv_sync.h
new file mode 100644
index 0000000..3df3886
--- /dev/null
+++ b/firmware/src/picc/tc_cdiv_sync.h
@@ -0,0 +1,5 @@
+#ifndef _TC_CDIV_SYNC_H
+#define _TC_CDIV_SYNC_H
+extern void tc_cdiv_sync_enable(void);
+extern void tc_cdiv_sync_init(void);
+#endif
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