Diff: tick.c

Revision:

31:f6ff7fdb9c67

Parent:

30:212ca42b8779

--- a/tick.c	Fri Feb 16 17:30:46 2018 +0000
+++ b/tick.c	Thu Nov 29 16:51:19 2018 +0000
@@ -2,7 +2,7 @@
 #include <stdbool.h>
 
 #include "rtc.h"
-#include "time.h"
+#include "tm.h"
 #include "tick.h"
 #include "timer.h"
 #include "led.h"
@@ -20,7 +20,7 @@
 
 bool    TickIsSet() { return countIsSet; }
 bool    Ticked()    { return ticked; }
-int64_t Ticks()     { return ticksThisScan; } //30th bit is one second
+int64_t TicksNow()  { return ticksThisScan; } //30th bit is one second
 
 int32_t TickGetSlew() { return slew; }
 void    TickSetSlew(int32_t value) { slew = value; }
@@ -32,16 +32,16 @@
 void    TicksToTmUtc  (int64_t ticks, struct tm* ptm)
 {
     time_t t = ticks >> TICK_ONE_SECOND_SHIFT;
-    TimeToTmUtc(t, ptm);
+    TmUtcFromTimeT(t, ptm);
 }
 int64_t TicksFromTmUtc(struct tm* ptm)
 {
-    time_t t = TimeFromTmUtc(ptm);
+    time_t t = TmUtcToTimeT(ptm);
     return t << TICK_ONE_SECOND_SHIFT;
 }
 
 
-/*
+/* Timer counts like this:
 +---------+---------------+
 | Seconds |   Base count  |
 +---------+---------------+
@@ -53,6 +53,9 @@
 |   45    |    25,032,704 |
 |   ...   |       ...     |
 +---------+---------------+
+Tick counts as a signed 64 bit integer
+1 bit sign, 33 bits for seconds, 30 bits for fraction
+giving +/- 272 years with a resolution of around approximately 1ns or 1 ppb per second (2^30 == 1024x1024x1024)
 */
 
 void TickSet(int64_t extClock)
@@ -73,7 +76,7 @@
 void TickMain()
 {    
     //Update the times whenever there has been a system second
-    if (TimerTicked)
+    if (TimerHadSecond)
     { 
         __disable_irq();
                tickCount += TICK_ONE_SECOND + ppb;