Diff: main.cpp

Revision:

0:ab6014cc9c12

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Mar 04 20:44:00 2013 +0000
@@ -0,0 +1,164 @@
+//  Experimentally derived Band Settings for VFO ...
+//      Band 0: 83.78 - 91.72
+//      Band 1: 88.74 - 98.28
+//      Band 2: 93.10 - 104.00
+//      Band 3: 99.50 - 112.72
+//      ref: http://cba.sakura.ne.jp/sub04/jisaku36.htm (translated)
+
+#include "mbed.h"
+#include "TextLCD.h"
+
+#define topFM  107900000            // Top of the FM Dial Range in USA
+#define botFM   87500000            // Bottom of the FM Dial Range in USA
+#define incrFM    200000            // FM Channel Increment in USA
+
+long frequency = 97300000;          // the default initial frequency in Hz
+long newFrequency = 0;
+bool mute = true;
+
+LocalFileSystem local("local");
+TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d4-d7
+Serial pc(USBTX, USBRX);
+I2C i2c(p9, p10);
+DigitalIn left(p23);
+DigitalIn center(p22);
+DigitalIn right(p21);
+FILE *fp;
+
+float storedF = 10.1;
+
+const int addr= 0xCC;
+
+void writeToReg(unsigned int, unsigned int, unsigned int);
+void initializeTransmitter(long);
+void setFrequency(long);
+
+int main() {
+      lcd.printf("Starting up.\r\n");
+      left.mode(PullUp);
+      center.mode(PullUp);
+      right.mode(PullUp);
+      wait_ms(100);                                //Wait for VDD to settle
+      
+      fp = fopen("/local/out.txt", "r");
+      fscanf(fp, "%f", &storedF);
+      fclose(fp);
+      
+      frequency = ((long)(storedF*100.0))*10000;
+      
+      //lcd.cls();
+      //lcd.printf("Transmitting on FM %d", frequency);
+      
+      initializeTransmitter(frequency);
+
+      while(1) {
+        if(left == 0)
+        {
+            if(frequency - incrFM > botFM)
+                frequency = frequency - incrFM;
+            else
+                frequency = topFM;
+                
+            lcd.cls();
+            setFrequency(frequency);
+            lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
+            
+            fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
+            fprintf(fp, "%2.1f", float(frequency)/1000000.0);
+            fclose(fp);
+        }
+        else if (right == 0)
+        {
+            if(frequency + incrFM < topFM)
+                frequency = frequency + incrFM;
+            else
+                frequency = botFM;   
+                 
+            lcd.cls();
+            setFrequency(frequency);
+            lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
+            
+            fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
+            fprintf(fp, "%2.1f", float(frequency)/1000000.0);
+            fclose(fp);
+        }
+        else if (center == 0)
+        {
+            frequency = 97300000;
+            lcd.cls();
+            setFrequency(frequency);
+            lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
+            
+            fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
+            fprintf(fp, "%2.1f", float(frequency)/1000000.0);
+            fclose(fp);
+        }
+        wait_ms(200); // lazy debounce
+    }
+}
+
+void initializeTransmitter(long freq)
+{
+    lcd.printf("Initializing...");
+    
+    writeToReg(addr, 0x0E, 0x05); // Software reset
+    
+    writeToReg(addr, 0x01, 0xB4); // Reg 1: forced subccarrier, pilot tone on
+    
+    writeToReg(addr, 0x02, 0x03); // Reg 2: Unlock detect off, 2mW Tx Power
+    
+    setFrequency(freq);
+      
+    //writeToReg(addr, 0x08, 0x1A); //Register 8: set Osc on band 2
+    
+    writeToReg(addr, 0x00, 0xA1); //Register 0: 200mV audio input, 75us pre-emphasis on, crystal off, power on
+
+    writeToReg(addr, 0x0E, 0x05); // Software reset
+    
+    writeToReg(addr, 0x06, 0x1E); // Reg 6: chare pumps at 320uA and 80 uA
+
+    lcd.cls();
+    lcd.printf("Transmitting on FM %2.1f", float(freq)/1000000.0);  //for debugging
+}
+
+void setFrequency(long freq)
+{     
+      int new_frequency;
+
+      // New Range Checking... Implement the (experimentally determined) VFO bands:
+      if (freq < 88500000) {        // Band 3
+        writeToReg(addr, 0x08, 0x1B);
+        //Serial.println("Band 3");
+      }  
+      else if (freq < 97900000) {   // Band 2
+        writeToReg(addr, 0x08, 0x1A);
+        //Serial.println("Band 2");
+      }
+      else if (freq < 103000000) {  // Band 1 
+        writeToReg(addr, 0x08, 0x19);
+        //Serial.println("Band 1");
+      }
+      else {                        // Band 0
+        // Must be OVER 103.000.000,
+        writeToReg(addr, 0x08, 0x18);
+        //Serial.println("Band 0");
+      }
+      
+      new_frequency = (freq + 304000) / 8192;
+      
+      unsigned char reg3 = new_frequency & 255;                  //extract low byte of frequency register
+      unsigned char reg4 = new_frequency >> 8;                   //extract high byte of frequency register
+      writeToReg(addr, 0x03, reg3);                             //send low byte
+      writeToReg(addr, 0x04, reg4);                             //send high byte
+      
+      writeToReg(addr, 0x0E, 0x05);         // Software reset
+}
+
+void writeToReg(unsigned int addr, unsigned int reg, unsigned int data)
+{
+    i2c.start();
+    i2c.write(addr);
+    i2c.write(reg);
+    i2c.write(data);
+    i2c.stop();
+}