Diff: pacemaker.cpp

Revision:

1:c6b87b3cc7af

Parent:

0:2196b652345b

Child:

2:f6066ec3c8bc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pacemaker.cpp	Mon Nov 25 03:02:33 2013 +0000
@@ -0,0 +1,134 @@
+#include "mbed.h"
+
+//Enable serial communication
+Serial pc(USBTX, USBRX); // tx, rx
+
+//Timers used to model the pacemaker
+Timeout AVI;
+Timeout PVARP;
+Timeout LRI;
+
+//Pins used to communicate with the heart, P9 is AP, P10 is VP, P11 is AS and P12 is VS
+DigitalOut pinAP(p9);
+DigitalOut pinVP(p10);
+InterruptIn pinAS(p11);
+InterruptIn pinVS(p12);
+
+//Reference LEDs
+DigitalOut vs(LED1);
+DigitalOut vp(LED2);
+DigitalOut as(LED3);
+DigitalOut ap(LED4);
+
+//Pacemaker values in seconds;
+float lri = 1.0;
+float pvarp = 0.3;
+float vrp = 0.2;
+float pvab = 0.05;
+float pavb = 0.05;
+float avi = 0.15;
+
+//Initial states
+int vsValid = 1;
+int asValid = 1;
+
+//Interrupt function prototypes
+void ASReceivedOrAPSent();
+void VSReceviedOrVPSent();
+void noVentricleEvent();
+void noAtrialEvent();
+void postPVARP();
+void blinkled();
+
+//Interrupt routines for all pacemaker states
+
+//Interrupt routine to handle atrial event
+void ASReceivedOrAPSent() {
+    if(asValid==1) {
+        /*as = 1;
+        wait(0.2);
+        as = 0;*/
+        //Disable the LRI timer as a AS has been received
+        LRI.detach();
+        //Disable the PVARP timer as a AS has been recieved
+        PVARP.detach();
+        //Make asValid=0 and vsValid=0
+        asValid = 0;
+        vsValid = 0;
+        //Set up timer to interrupt at AVI and call noVentricleEvent if no ventricular event comes
+        AVI.attach(&noVentricleEvent, avi);
+        //Wait for PAVB and disable all interrupts
+        __disable_irq();
+        wait(pavb);
+        //After waiting for PAVB enable interrupts and make asValid=0 and vsValid=1
+        __enable_irq();
+        asValid = 0;
+        vsValid = 1;
+    }
+}
+
+//Interrupt routine to handle atrial event
+void VSReceivedOrVPSent() {
+    if(vsValid==1) {
+        /*vs = 1;
+        wait(0.2);
+        vs = 0;*/
+        //Disable the AVI timer as VS has been recieved.
+        AVI.detach();
+        asValid = 0;
+        vsValid = 0;
+        //Set up timer to interrupt at PVARP
+        PVARP.attach(&postPVARP, pvarp);
+        //Set up timer to interrupt at LRI-AVI
+        LRI.attach(&noAtrialEvent, lri-avi);
+        //Wait for VRP and disable all interrupts
+        __disable_irq();
+        wait(vrp);
+        //After waiting for VRP enable interrupts make asValid = 0 and vsValid = 1
+        __enable_irq();
+        asValid = 0;
+        vsValid = 1;
+    }
+}
+
+//Interrupt routine to handle post AVI scenario when no VS is receieved
+void noVentricleEvent() {
+    //Pace heart now, ventricle!
+    pinVP = 1;
+    wait(0.01);
+    pinVP = 0;
+    //Call VSReceiedOrVPSent()
+    VSReceivedOrVPSent();     
+}
+
+//Interrupt routine to hande scenario when no AS or VS is recevied till PVARP
+void postPVARP() {
+    vsValid = 1;
+    asValid = 1;
+}
+
+
+//Interruot routine to handle scenarios when there is no Atrial event
+void noAtrialEvent() {
+    //Pace heart now, atrial!
+    pinAP = 1;
+    wait(0.01);
+    pinAP = 0;
+    ASReceivedOrAPSent();
+}
+
+/*void blinkled() {
+    vs=1;
+    wait(0.2);
+    vs=0;
+}*/
+
+int main() {
+    //Pins used to communicate with the heart
+    //P11 is AS and P12 is VS
+    pinAS.rise(&ASReceivedOrAPSent);
+    pinVS.rise(&VSReceivedOrVPSent);
+    __enable_irq();
+    while(1) {
+    }
+}