Revision 0:3221a95c5f82, committed 2010-12-01

Comitter:

StevenHe

Date:

Wed Dec 01 04:37:12 2010 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 01 04:37:12 2010 +0000
@@ -0,0 +1,190 @@
+#include "mbed.h"
+
+#define numsamples 1
+#define sizeofpattern 30
+#define S_idle 0
+#define S_HostInput 1
+#define S_UserInput 2
+#define S_HostError 3
+#define S_UserError 4
+#define S_Match 5
+
+//  function declartion
+int touchSense(int Num_Charger);
+void displayString(int* String);
+void displayMessage(int NumMes);
+
+//  I/O declarations
+DigitalOut myled(LED1);
+AnalogIn input1(p20), input0(p17);
+DigitalIn charger1(p19), charger0(p16);
+DigitalOut ground(p18);
+Serial pc(USBTX, USBRX); // tx, rx
+
+
+//  variable definitions
+int hostString[sizeofpattern];
+int currentState = S_idle;
+int nextState = S_idle;
+
+
+int main() {
+    int i=0, j=0;
+    int token;
+
+    while (1) {
+        token = 'n';    // n = no input
+
+//  accept input token in either touchsense or host input form
+        if (pc.readable()) {
+            token = pc.getc(); //  getc returns int representation of letters and digits
+            pc.putc(token);
+        } else if (touchSense(0)) {
+            myled = 1;
+            token = '0';
+            pc.putc('0');
+        } else if (touchSense(1))  {
+            myled =1;
+            token = '1';
+            pc.putc('1');
+        } else myled = 0;
+
+
+//  debugging output
+        if (token=='m')   {
+            printf("current token is %d \n", token);
+            printf("current j and jth element are %d %d \n", j, hostString[j]);
+            printf("The string received from host is");
+            displayString(hostString);
+            printf("current state and next state are %d %d \n", currentState, nextState);
+        }
+
+
+        if (token == 'n' )  continue; // if no input, skip this cycle
+
+
+//  deciding what next state is and generates output
+        if (currentState == S_idle)  {
+            if (token == 'S' )   nextState = S_HostInput;
+            else {
+                nextState = currentState;
+                displayMessage(1);
+            }
+        }
+
+
+        else if (currentState == S_HostInput) {
+            if ((token == '0' || token == '1') && i < sizeofpattern) {
+                hostString[i] = token;
+                i++;
+                nextState = currentState;   //  remain in the same state
+            }
+            //
+            else if (token == 'm')   nextState = currentState;
+            //
+            else if (token == 'E')   nextState = S_UserInput;
+            else {                      //  S_HostError
+                displayMessage(1);
+                nextState = S_idle;
+                i = 0;
+            }
+        }
+
+        else if (currentState == S_UserInput) {
+
+            if (hostString[j] == token) {
+                nextState = currentState;
+                j++;
+                if (j==i)  {
+                    displayMessage(3);      // S_Match
+                    nextState = S_idle;
+                    j =0;
+                    i=0;
+                }
+            }
+
+            //
+            else if (token == 'm')   nextState = currentState;
+            //
+            else {                              // S_UserError
+                displayMessage(0);
+                nextState = S_UserInput;
+                j = 0;
+            }
+        }
+
+        /*
+                else if (currentState == S_Match) {
+                    displayMessage(3);
+                    nextState = S_idle;
+                    j =0;
+                    i=0;
+                }
+
+
+                else if (currentState == S_HostError) {
+                    displayMessage(1);
+                    nextState = S_idle;
+                    i = 0;
+                }
+
+
+                else if (currentState == S_UserError) {
+                    displayMessage(0);
+                    nextState = S_UserInput;
+                    j = 0;
+                }
+        */
+
+
+
+
+
+//  state transition
+        currentState = nextState;
+
+    }// end of while
+
+}   //  end of main
+
+
+int touchSense(int Num_Charger) {
+    float sample1, sample2;
+    ground = 0;
+    if (Num_Charger ==1) {
+        charger1.mode(PullUp);
+        charger1.mode(PullNone);
+        sample1=input1.read();  // take two samples to ignore temp jump
+        wait(0.2);
+        sample2=input1.read();
+    } else {
+        charger0.mode(PullUp);
+        charger0.mode(PullNone);
+        sample1=input0.read();  // take two samples to ignore temp jump
+        wait(0.2);
+        sample2=input0.read();
+    }
+
+    if (sample1 < 0.3 && sample2 < 0.3) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+//  debugging output
+void displayString(int* String) {
+    for (int j=0; j<sizeofpattern; j++)
+        pc.putc(String[j]);
+
+    pc.putc('\n');
+
+}
+
+void displayMessage(int NumMes) {
+    if (NumMes == 1)
+        printf("HOST ERROR : Host must send string in the form of Sxxxx...E X=0 or 1 \n");
+    else if (NumMes == 0)  printf("TOUCH ERROR: Please enter the string that matched host string exactly through touchsensor\n");
+    else   printf("MATCH: Host will send another string\n");
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Dec 01 04:37:12 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e