Diff: mbedInterface/mbedInterface.cpp

Revision:

3:d7b0a0890d96

Parent:

0:8dbd6bd9167f

Child:

4:abee20c0bf2a

--- a/mbedInterface/mbedInterface.cpp	Wed Jun 03 23:41:16 2015 +0000
+++ b/mbedInterface/mbedInterface.cpp	Sat Oct 10 22:37:17 2015 +0000
@@ -9,6 +9,9 @@
 
 //globals defined in hardwareInterface.cpp
 extern uint32_t timeKeeper; //the master clock
+uint32_t uSec_SinceLastClockInc = 0;
+uint32_t uSec_SinceLastReset = 0;
+
 extern bool resetTimer;
 extern bool clockSlave;
 extern bool changeToSlave;
@@ -20,7 +23,7 @@
 
 
 #ifdef MBED_RF
-//Karpova version----------------------------------------
+//We are listening to an RF signal for hardware syncing----------------------------------------
 //Uses DB9->RJ45 connector to map the following channels:
 //1: P28    Clock Signal In
 //2: P27    Data Signal In
@@ -93,7 +96,34 @@
 //------------------------------------------------------------
 #endif
 
+void externalClockIncDown() {
 
+    //The external clock increment signal pulse has come back down.  If the pulse was long
+    //enough, then we condsider it a valid pulse (the pulses should be 0.5 ms long)
+    if ((clockSlave)&&(uSec_SinceLastClockInc >= 300)) {
+        uSec_SinceLastClockInc = 0;
+        timeKeeper++;
+
+        //Clock resets happen upon update so we dont get a partial first ms
+        if (resetTimer) {
+            uSec_SinceLastReset = 0;
+            timeKeeper = 0;
+            resetTimer = false;
+        }
+    }
+
+}
+
+void externalResetDown() {
+
+    //The external clock reset signal pulse has come back down.  If the pulse was long
+    //enough, then we condsider it a valid pulse (the pulses should be 1 ms long)
+    if ((clockSlave)&&(uSec_SinceLastReset >= 700)) {
+        uSec_SinceLastReset = 0;
+        timeKeeper = 1; //It has been 1ms since the reset pulse went up
+        textDisplay << timeKeeper << " Clock reset\r\n";
+    }
+}
 
 //------------------------------------------------------------------------
 //------------------------------------------------------------------------
@@ -102,27 +132,37 @@
 //---------------------------------------------------------------------
 
 //translate pin numbers to hardware pins
-PinName outPins[NUMPORTS] = {p11,p13,p15,p18,p21,p23,p25,p29,p20};
+//PinName outPins[NUMPORTS] = {p11,p13,p15,p18,p21,p23,p25,p29,p20};
+PinName outPins[NUMPORTS] = {p18,p15,p13,p11,p29,p25,p23,p21,p20};
 PinName inPins[NUMPORTS] = {p12,p14,p16,p17,p22,p24,p26,p30,p7};
 
 
 
+
 //The sound output uses a SmartWav device and their simple serial library
 SMARTWAV sWav(p9,p10,p19);   //(TX,RX,Reset);
 
 //This is the callback for the MBED timer
 extern "C" void TIMER0_IRQHandler (void) {
 
-    if((LPC_TIM0->IR & 0x01) == 0x01) {  // if MR0 interrupt, proceed
+    if (clockSlave) {
+        //The function is called every 100 us
+        uSec_SinceLastClockInc = uSec_SinceLastClockInc+100;
+        uSec_SinceLastReset = uSec_SinceLastReset+100;
+    } else {
+        //The function is called every 1 ms
+        if((LPC_TIM0->IR & 0x01) == 0x01) {  // if MR0 interrupt, proceed
 
-        LPC_TIM0->IR |= 1 << 0;         // Clear MR0 interrupt flag
-        timeKeeper++;
+            LPC_TIM0->IR |= 1 << 0;         // Clear MR0 interrupt flag
+            timeKeeper++;
 
-        if (resetTimer) {
-            timeKeeper = 0;
-            resetTimer = false;
+            if (resetTimer) {
+                timeKeeper = 0;
+                resetTimer = false;
+            }
         }
     }
+
 }
 //-----------------------------------------------------------------------
 
@@ -133,6 +173,7 @@
     clockExternalIncrement(p8) {
 
     clockResetInt.rise(this, &MBEDSystem::externalClockReset);
+    clockResetInt.fall(&externalResetDown);
     clockResetInt.mode(PullDown);
 
     clockExternalIncrement.mode(PullDown);
@@ -165,8 +206,9 @@
     //LPC_SC->PCLKSEL1 |= (1 << 12); //sets it to 1*SystemCoreClock - table 42 (page 57 in user manual)
     //LPC_SC->PCLKSEL0 &= (3 << 3); //mask
     //LPC_SC->PCLKSEL0 |= (1 << 3); //sets it to 1*SystemCoreClock - table 42 (page 57 in user manual)
-    LPC_SC->PCONP |=1<1;            //timer0 power on
+    LPC_SC->PCONP |=1<1;            //timer0 power on   
     LPC_TIM0->MR0 = 23980;        //1 msec
+
     //LPC_TIM0->PR  = (SystemCoreClock / 1000000); //microsecond steps
     //LPC_TIM0->MR0 = 1000;        //100 msec
     //LPC_TIM0->MR0  = (SystemCoreClock / 1000000); //microsecond steps
@@ -178,6 +220,14 @@
     //--------------------------------------------------------------
 }
 
+void MBEDSystem::pauseInterrupts() {
+    __disable_irq();
+}
+
+void MBEDSystem::resumeInterrupts() {
+    __enable_irq();
+}
+
 void MBEDSystem::mainLoopToDo() {
     #ifdef MBED_RF
     //Karpova version--------------------------
@@ -225,25 +275,35 @@
 
 void MBEDSystem::externalClockReset() {
 
+    //The pulse has gone high.  When the pulse comes down we will check to see if it was long enough to be valid.
+    uSec_SinceLastReset = 0;
+
+
+    /*
     if (clockSlave) {
         LPC_TIM0->TCR = 0x02;    // reset timer
         externalIncrementCounter = 0;
         immediateClockReset();
-    }
+    }*/
 
 }
 
 void MBEDSystem::setStandAloneClock() {
-    timerinit();
+    clockSlave = false;
+    NVIC_DisableIRQ(TIMER0_IRQn); // Disable the interrupt
+    timerinit(); //set up and enable interrupt
     clockExternalIncrement.rise(NULL); //remove the callback to the external interrupt
-    clockSlave = false;
+    //clockExternalIncrement.fall(NULL);
     changeToSlave = false;
     changeToStandAlone = false;
 }
 
 void MBEDSystem::setSlaveClock() {
+    clockSlave = true;
     NVIC_DisableIRQ(TIMER0_IRQn); // Disable the interrupt
+    //timerinit(); //set up and enable interrupt
     clockExternalIncrement.rise(this, &MBEDSystem::incrementClock);
+    //clockExternalIncrement.fall(&externalClockIncDown);
     clockSlave = true;
     changeToSlave = false;
     changeToStandAlone = false;
@@ -252,6 +312,12 @@
 void MBEDSystem::incrementClock() {
 
     if (clockSlave) {
+        //The pulse has gone high.  When the pulse comes down we will check to see if it was long enough to be valid.
+        //uSec_SinceLastClockInc = 0;
+
+
+        //The clock is incremented
+
         externalIncrementCounter = (externalIncrementCounter+1) % externalIncrementMod;
         if (externalIncrementCounter==0) {
             timeKeeper++;
@@ -261,10 +327,12 @@
         timeKeeper++;
     }
     //Clock resets happen upon update so we dont get a partial first ms
+    /*
     if (resetTimer) {
+        uSec_SinceLastReset = 0;
         timeKeeper = 0;
         resetTimer = false;
-    }
+    }*/
 }
 
 //-----------------------------------------------------
@@ -360,3 +428,16 @@
 void MBEDSerialPort::writeChar(char s) {
     serialToPC->printf("%c", s);
 }
+
+int MBEDSerialPort::requestToWriteString(char *s, int numBytesRequested) {
+    //request to print a string to the serial output buffer
+    //function returns the number of chars actually accepted for output
+    int numBytesAccepted = 0;
+    while (numBytesAccepted < numBytesRequested) {
+
+        writeChar(*(s+numBytesAccepted));
+        numBytesAccepted++;
+    }
+
+    return numBytesAccepted;
+}