Diff: main.cpp

Revision:

10:6924c58f3a91

Parent:

9:d88699a0905a

Child:

11:ceabd476b6cd

--- a/main.cpp	Fri Mar 01 13:33:02 2013 +0000
+++ b/main.cpp	Wed Feb 22 14:53:00 2017 +0000
@@ -1,14 +1,101 @@
 #include "mbed.h"
 #include "USBSerial.h"
- 
-//Virtual serial port over USB
-USBSerial serial;
- 
-int main(void) {
- 
+
+SPI spi(p5, p6, p7);      // DAC mosi, miso, sclk
+DigitalOut cs(p8);        // active low DAC enable
+DigitalOut outen(p21);    // active low pulse output enable
+DigitalOut outxpol(p23);  // pulse output x polarity
+DigitalOut outypol(p22);  // pulse output y polarity
+USBSerial serial;         // USB serial communication
+
+int v = 0;                // voltage 0 to 1023 = 0 to 102.3 V
+int t, i, e, len;
+char CmdIn[128];
+char CmdP0[] = "P=0";     // polarity 0
+char CmdP1[] = "P=1";     // polarity 1
+char CmdP2[] = "P=2";     // polarity 2
+char CmdP3[] = "P=3";     // polarity 3
+char CmdO0[] = "O=0";     // output off
+char CmdO1[] = "O=1";     // output on
+char CmdVn[] = "V=";      // voltage
+char CmdID[] = "ID";      // Identification
+
+void Voltage(int d) {
+    d = (d<<4)&0x3fff;    // value is bit 13 to 4
+    cs = 0;
+    spi.write(d);
+    cs = 1;
+}
+
+int main() {
+    outen = 1;            // output off
+    outxpol = 0;
+    outypol = 0;
+    cs = 1;               // spi not selected
+    spi.format(16,2);
+    spi.frequency(1000000);
+    Voltage(v);
     while(1)
     {
-        serial.printf("I am a virtual serial port\r\n");
+        e = 1;            // set error
+        serial.scanf("%s", CmdIn);
+        if (strcmp(CmdIn, CmdP0) == 0) {
+            outxpol = 1;
+            outypol = 1;
+            e = 0;
+        }
+        if (strcmp(CmdIn, CmdP1) == 0) {
+            outxpol = 1;
+            outypol = 0;
+            e = 0;
+        }
+        if (strcmp(CmdIn, CmdP2) == 0) {
+            outxpol = 0;
+            outypol = 0;
+            e = 0;
+        }
+        if (strcmp(CmdIn, CmdP3) == 0) {
+            outxpol = 0;
+            outypol = 1;
+            e = 0;
+        }
+        if (strcmp(CmdIn, CmdO0) == 0) {
+            outen = 1;
+            e = 0;
+        }
+        if (strcmp(CmdIn, CmdO1) == 0) {
+            outen = 0;
+            e = 0;
+        }
+        if (strncmp(CmdIn, CmdVn, 2) == 0) {
+            v = 0;
+            len = strlen(CmdIn);
+            for(i=2; i<len; i++){
+                t = CmdIn[i] - '0';
+                if ((t >= 0) && (t <= 9)) { 
+                    v = v * 10 + t; 
+                }
+                else {
+                    v = -1;   // on input error make v out of range
+                    break;
+                }
+            }
+            if ((v >= 0) && (v <= 1023)) {
+                Voltage(v);
+                e = 0;  
+            }
+        }
+        if (strcmp(CmdIn, CmdID) == 0) {
+            serial.printf( "Bias Voltage Generator V1.0\n");
+            e = 0;
+        }
+        if (e == 1) {
+            serial.printf( "Command Error ");
+            serial.printf("%s\n", CmdIn);
+        }
+        else {
+            serial.printf( "Command Executed\n");  
+        }
         wait(1);
     }
-}
\ No newline at end of file
+}