Revision 4:1ae9f76749b9, committed 2018-06-14

Comitter:

trhackett

Date:

Thu Jun 14 19:39:23 2018 +0000

Parent:

3:f34bbdea0786

Commit message:

current time mbed post comp arch

Changed in this revision

diff -r f34bbdea0786 -r 1ae9f76749b9 main.cpp
--- a/main.cpp	Tue Jun 12 00:27:26 2018 +0000
+++ b/main.cpp	Thu Jun 14 19:39:23 2018 +0000
@@ -20,7 +20,7 @@
 const float interval = 0.1;
 int numTicks = 0;
 int prevNumTicks = 0;
-float timingError = 0.0;
+float intervalError = 0.0;
 
 char prevTime[11] = "00:00:00.0";
 char displayTime[11] = "00:00:00.0";
@@ -42,7 +42,6 @@
 EventQueue receiveTimeQueue;
 
 int main() {    
-//    pc.printf("main started!!\r\n");
     
     kw40z_device.attach_alert(&AlertReceived);
     
@@ -140,12 +139,13 @@
 // time and hopefully it will be more accurate.
 void updateError() {
     
-    float secsToAdd = interval * prevNumTicks + timingError;
+    // 
+    float secsToAdd = prevNumTicks * (interval + intervalError);
     
     float T1 = currTimeSecs(displayTime);
     float T0 = currTimeSecs(prevTime);
     
-    timingError += (T1 - (T0+secsToAdd)) / prevNumTicks;
+    intervalError = (T1 - (T0+secsToAdd)) / prevNumTicks;
 }
 
 int numPrints = 20;
@@ -156,7 +156,7 @@
 void updateDisplayString() {
     numTicks++;
     
-    float offset = interval * numTicks + timingError;
+    float offset = numTicks * (interval + intervalError);
     
     addSecondsToCurrentTime(prevTime, displayTime, offset);
     

diff -r f34bbdea0786 -r 1ae9f76749b9 timeHelp.h
--- a/timeHelp.h	Tue Jun 12 00:27:26 2018 +0000
+++ b/timeHelp.h	Thu Jun 14 19:39:23 2018 +0000
@@ -5,6 +5,7 @@
 #include <string>
 
 // return true is seconds is even, false if not
+// currTime is in the form HH:MM:SS.s
 bool secondsAreEven(char currTime[]) {
     char seconds[3];
     seconds[0] = currTime[6];
@@ -16,9 +17,10 @@
     return (secondsInt % 2) == 0;
 }
 
-// given a starting time and a number of seconds, add the seconds to that time
-// and put the resulting string into resultTime ... both startTime and resultTime
-// must be character arrays of length 10
+// given a starting time (starttime) in the form HH:MM:SS.s
+// and a number of seconds (secsToAdd), add the seconds to that
+// time and put the resulting string into resultTime ... both
+// startTime and resultTime must be character arrays of length 10
 void addSecondsToCurrentTime(char startTime[], char resultTime[], float secsToAdd) {
 
     int decsToAdd=0,newSecsToAdd=0,minutesToAdd=0,hoursToAdd=0;
@@ -102,7 +104,8 @@
 }
 
 // given the current time in the form HH:MM:SS.S
-// give me back the number of seconds in that number
+// give me back the number of seconds from 00:00:00.0
+// at that time
 float currTimeSecs(char currentTime[]) {
     // hours
     char hours[3];