From 6cab91b0ab0b538cd63d94c1afd38e3fd287efec Mon Sep 17 00:00:00 2001
From: root <root@lab.panaceas.james.local>
Date: Tue, 17 Apr 2018 10:35:31 +0100
Subject: happy dcf77 better pll, and stamps for long term stability

---
 app/msf.c | 87 +++++++++++++++++++++++++++++++--------------------------------
 1 file changed, 43 insertions(+), 44 deletions(-)

(limited to 'app/msf.c')

diff --git a/app/msf.c b/app/msf.c
index 392bfe7..2e7dd93 100644
--- a/app/msf.c
+++ b/app/msf.c
@@ -6,44 +6,35 @@
 #define T (GPIO0)
 #define T_PORT GPIOB
 
-static uint8_t bitsa[60], bitsb[60];
+static Event_ring msf_ring;
 
-static int time_known;
-static int check_parity (uint8_t *d, unsigned s, unsigned e, uint8_t p)
+uint64_t msf_last_second;
+
+
+void exti0_isr (void)
 {
-  unsigned i;
+  uint32_t now = SCS_DWT_CYCCNT;
+  int v;
 
-  for (i = s; i <= e; ++i)
-    p ^= d[i];
+  v = !!gpio_get (T_PORT, T);
 
-  return !p;
-}
+  nvic_disable_irq (NVIC_EXTI0_IRQ);
+  exti_reset_request (EXTI0);
 
+  msf_ring.events[msf_ring.tx_ptr].when = now;
+  msf_ring.events[msf_ring.tx_ptr].value = v;
+  msf_ring.tx_ptr = (msf_ring.tx_ptr + 1) & ERING_MASK;
 
-static unsigned bcd (uint8_t *d, unsigned s, unsigned e)
-{
-  unsigned ret = 0, c, b, i;
+  nvic_enable_irq (NVIC_EXTI0_IRQ);
 
-  for (i = e, c = 1, b = 0; i >= s; --i, b++) {
+}
 
-    if (d[i]) ret += c;
 
 
-    switch (b & 3) {
-    case 0:
-    case 1:
-    case 2:
-      c <<= 1;
-      break;
 
-    default:
-      c >>= 3;
-      c *= 10;
-    }
-  }
+static uint8_t bitsa[60], bitsb[60];
 
-  return ret;
-}
+static int time_known;
 
 
 
@@ -103,8 +94,10 @@ static void process_bits (uint64_t abs)
   pll_set_offset (msf_time, abs);
   time_known = 1;
 
-  printf ("Next minute is: %02d-%02d-%02d %02d:%02d\r\n", u.year, u.month, u.mday, u.hour, u.minute);
-  time_print_epoch (msf_time);
+  stats_stamp (u, abs);
+
+  printf ("MSF: Next minute is: %02d-%02d-%02d %02d:%02d\r\n", u.year, u.month, u.mday, u.hour, u.minute);
+  //time_print_epoch (msf_time);
 }
 
 
@@ -121,29 +114,31 @@ static void report_bits (uint64_t abs, int second, int a, int b)
 
 static void report_time (uint64_t abs)
 {
+#if 0
   EPOCH e = pll_decompose (abs);
-  time_print_epoch (e);
-  printf ("%d\r\n", (unsigned) e.s);
+  time_print_epoch ("MSF: ", e);
+#endif
 }
 
-void exti0_isr (void)
+
+void msf_dispatch (void)
 {
-  static uint32_t last_0;
-  static uint32_t last_1;
-  static uint32_t last_s;
+  static uint32_t last_0, last_1, last_s;
   static int second, bita, bitb, had_m;
-
-  uint32_t now = SCS_DWT_CYCCNT;
-  uint64_t abs;
-
   uint32_t pulse_w, offset;
+  uint64_t abs;
   int is_s = 0;
+
+  uint32_t now;
   int v;
 
-  nvic_disable_irq (NVIC_EXTI0_IRQ);
-  exti_reset_request (EXTI0);
 
-  v = !!gpio_get (T_PORT, T);
+  if (msf_ring.rx_ptr == msf_ring.tx_ptr) return;
+
+  v = msf_ring.events[msf_ring.rx_ptr].value;
+  now = msf_ring.events[msf_ring.rx_ptr].when;
+
+  msf_ring.rx_ptr = (msf_ring.rx_ptr + 1) & ERING_MASK;
 
   if (v) {
     pulse_w = now - last_0;
@@ -174,16 +169,21 @@ void exti0_isr (void)
 
   if (is_s) {
     abs = abs_extend (now);
+    msf_last_second = abs;
+
     pll_dispatch (abs);
 
+
+
     if (had_m) {
       report_bits (abs, second, bita, bitb);
       second++;
-
     }
 
     if (time_known)
       report_time (abs);
+
+    stats();
   }
 
 
@@ -206,11 +206,10 @@ void exti0_isr (void)
 
 
 
-  nvic_enable_irq (NVIC_EXTI0_IRQ);
 }
 
 void
-radio_init (void)
+msf_init (void)
 {
   MAP_INPUT (T);
   MAP_OUTPUT_PP (P1);
-- 
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