#define timesync_regs ((timesync_regs_t *) TIMESYNC_BASE)
-#define TSC_SOURCE (1 << 0)
-#define TSC_IENABLE (1 << 1)
-#define TSC_EXTSYNC (1 << 2)
-#define TSC_PPSEDGE (1 << 3)
-#define TSC_EVERYPPS (1 << 4)
+#define TSC_SOURCE_PPS (1 << 0)
+//#define TSC_SOURCE_FREE_RUN (0 << 0)
+#define TSC_IENABLE (1 << 1)
+#define TSC_EXTSYNC (1 << 2)
+#define TSC_PPSEDGE_POS (1 << 3)
+//#define TSC_PPSEDGE_NEG (0 << 3)
+#define TSC_TRIGGER_EVERYPPS (1 << 4)
+//#define TSC_TRIGGER_ONCE (0 << 4)
///////////////////////////////////////////////////
// SD Card SPI interface, Slave 13