William Decker / Mbed 2 deprecated FM_Transmitter

Using the NS73M

Dependencies:   TextLCD mbed

main.cpp@0:ab6014cc9c12, 2013-03-04 (annotated)

Committer:
whdecker
Date:
Mon Mar 04 20:44:00 2013 +0000
Revision:
0:ab6014cc9c12
First FM transmitter release (NS73M)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
whdecker 0:ab6014cc9c12 1 // Experimentally derived Band Settings for VFO ...
whdecker 0:ab6014cc9c12 2 // Band 0: 83.78 - 91.72
whdecker 0:ab6014cc9c12 3 // Band 1: 88.74 - 98.28
whdecker 0:ab6014cc9c12 4 // Band 2: 93.10 - 104.00
whdecker 0:ab6014cc9c12 5 // Band 3: 99.50 - 112.72
whdecker 0:ab6014cc9c12 6 // ref: http://cba.sakura.ne.jp/sub04/jisaku36.htm (translated)
whdecker 0:ab6014cc9c12 7
whdecker 0:ab6014cc9c12 8 #include "mbed.h"
whdecker 0:ab6014cc9c12 9 #include "TextLCD.h"
whdecker 0:ab6014cc9c12 10
whdecker 0:ab6014cc9c12 11 #define topFM 107900000 // Top of the FM Dial Range in USA
whdecker 0:ab6014cc9c12 12 #define botFM 87500000 // Bottom of the FM Dial Range in USA
whdecker 0:ab6014cc9c12 13 #define incrFM 200000 // FM Channel Increment in USA
whdecker 0:ab6014cc9c12 14
whdecker 0:ab6014cc9c12 15 long frequency = 97300000; // the default initial frequency in Hz
whdecker 0:ab6014cc9c12 16 long newFrequency = 0;
whdecker 0:ab6014cc9c12 17 bool mute = true;
whdecker 0:ab6014cc9c12 18
whdecker 0:ab6014cc9c12 19 LocalFileSystem local("local");
whdecker 0:ab6014cc9c12 20 TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d4-d7
whdecker 0:ab6014cc9c12 21 Serial pc(USBTX, USBRX);
whdecker 0:ab6014cc9c12 22 I2C i2c(p9, p10);
whdecker 0:ab6014cc9c12 23 DigitalIn left(p23);
whdecker 0:ab6014cc9c12 24 DigitalIn center(p22);
whdecker 0:ab6014cc9c12 25 DigitalIn right(p21);
whdecker 0:ab6014cc9c12 26 FILE *fp;
whdecker 0:ab6014cc9c12 27
whdecker 0:ab6014cc9c12 28 float storedF = 10.1;
whdecker 0:ab6014cc9c12 29
whdecker 0:ab6014cc9c12 30 const int addr= 0xCC;
whdecker 0:ab6014cc9c12 31
whdecker 0:ab6014cc9c12 32 void writeToReg(unsigned int, unsigned int, unsigned int);
whdecker 0:ab6014cc9c12 33 void initializeTransmitter(long);
whdecker 0:ab6014cc9c12 34 void setFrequency(long);
whdecker 0:ab6014cc9c12 35
whdecker 0:ab6014cc9c12 36 int main() {
whdecker 0:ab6014cc9c12 37 lcd.printf("Starting up.\r\n");
whdecker 0:ab6014cc9c12 38 left.mode(PullUp);
whdecker 0:ab6014cc9c12 39 center.mode(PullUp);
whdecker 0:ab6014cc9c12 40 right.mode(PullUp);
whdecker 0:ab6014cc9c12 41 wait_ms(100); //Wait for VDD to settle
whdecker 0:ab6014cc9c12 42
whdecker 0:ab6014cc9c12 43 fp = fopen("/local/out.txt", "r");
whdecker 0:ab6014cc9c12 44 fscanf(fp, "%f", &storedF);
whdecker 0:ab6014cc9c12 45 fclose(fp);
whdecker 0:ab6014cc9c12 46
whdecker 0:ab6014cc9c12 47 frequency = ((long)(storedF*100.0))*10000;
whdecker 0:ab6014cc9c12 48
whdecker 0:ab6014cc9c12 49 //lcd.cls();
whdecker 0:ab6014cc9c12 50 //lcd.printf("Transmitting on FM %d", frequency);
whdecker 0:ab6014cc9c12 51
whdecker 0:ab6014cc9c12 52 initializeTransmitter(frequency);
whdecker 0:ab6014cc9c12 53
whdecker 0:ab6014cc9c12 54 while(1) {
whdecker 0:ab6014cc9c12 55 if(left == 0)
whdecker 0:ab6014cc9c12 56 {
whdecker 0:ab6014cc9c12 57 if(frequency - incrFM > botFM)
whdecker 0:ab6014cc9c12 58 frequency = frequency - incrFM;
whdecker 0:ab6014cc9c12 59 else
whdecker 0:ab6014cc9c12 60 frequency = topFM;
whdecker 0:ab6014cc9c12 61
whdecker 0:ab6014cc9c12 62 lcd.cls();
whdecker 0:ab6014cc9c12 63 setFrequency(frequency);
whdecker 0:ab6014cc9c12 64 lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 65
whdecker 0:ab6014cc9c12 66 fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
whdecker 0:ab6014cc9c12 67 fprintf(fp, "%2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 68 fclose(fp);
whdecker 0:ab6014cc9c12 69 }
whdecker 0:ab6014cc9c12 70 else if (right == 0)
whdecker 0:ab6014cc9c12 71 {
whdecker 0:ab6014cc9c12 72 if(frequency + incrFM < topFM)
whdecker 0:ab6014cc9c12 73 frequency = frequency + incrFM;
whdecker 0:ab6014cc9c12 74 else
whdecker 0:ab6014cc9c12 75 frequency = botFM;
whdecker 0:ab6014cc9c12 76
whdecker 0:ab6014cc9c12 77 lcd.cls();
whdecker 0:ab6014cc9c12 78 setFrequency(frequency);
whdecker 0:ab6014cc9c12 79 lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 80
whdecker 0:ab6014cc9c12 81 fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
whdecker 0:ab6014cc9c12 82 fprintf(fp, "%2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 83 fclose(fp);
whdecker 0:ab6014cc9c12 84 }
whdecker 0:ab6014cc9c12 85 else if (center == 0)
whdecker 0:ab6014cc9c12 86 {
whdecker 0:ab6014cc9c12 87 frequency = 97300000;
whdecker 0:ab6014cc9c12 88 lcd.cls();
whdecker 0:ab6014cc9c12 89 setFrequency(frequency);
whdecker 0:ab6014cc9c12 90 lcd.printf("Transmitting on FM %2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 91
whdecker 0:ab6014cc9c12 92 fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
whdecker 0:ab6014cc9c12 93 fprintf(fp, "%2.1f", float(frequency)/1000000.0);
whdecker 0:ab6014cc9c12 94 fclose(fp);
whdecker 0:ab6014cc9c12 95 }
whdecker 0:ab6014cc9c12 96 wait_ms(200); // lazy debounce
whdecker 0:ab6014cc9c12 97 }
whdecker 0:ab6014cc9c12 98 }
whdecker 0:ab6014cc9c12 99
whdecker 0:ab6014cc9c12 100 void initializeTransmitter(long freq)
whdecker 0:ab6014cc9c12 101 {
whdecker 0:ab6014cc9c12 102 lcd.printf("Initializing...");
whdecker 0:ab6014cc9c12 103
whdecker 0:ab6014cc9c12 104 writeToReg(addr, 0x0E, 0x05); // Software reset
whdecker 0:ab6014cc9c12 105
whdecker 0:ab6014cc9c12 106 writeToReg(addr, 0x01, 0xB4); // Reg 1: forced subccarrier, pilot tone on
whdecker 0:ab6014cc9c12 107
whdecker 0:ab6014cc9c12 108 writeToReg(addr, 0x02, 0x03); // Reg 2: Unlock detect off, 2mW Tx Power
whdecker 0:ab6014cc9c12 109
whdecker 0:ab6014cc9c12 110 setFrequency(freq);
whdecker 0:ab6014cc9c12 111
whdecker 0:ab6014cc9c12 112 //writeToReg(addr, 0x08, 0x1A); //Register 8: set Osc on band 2
whdecker 0:ab6014cc9c12 113
whdecker 0:ab6014cc9c12 114 writeToReg(addr, 0x00, 0xA1); //Register 0: 200mV audio input, 75us pre-emphasis on, crystal off, power on
whdecker 0:ab6014cc9c12 115
whdecker 0:ab6014cc9c12 116 writeToReg(addr, 0x0E, 0x05); // Software reset
whdecker 0:ab6014cc9c12 117
whdecker 0:ab6014cc9c12 118 writeToReg(addr, 0x06, 0x1E); // Reg 6: chare pumps at 320uA and 80 uA
whdecker 0:ab6014cc9c12 119
whdecker 0:ab6014cc9c12 120 lcd.cls();
whdecker 0:ab6014cc9c12 121 lcd.printf("Transmitting on FM %2.1f", float(freq)/1000000.0); //for debugging
whdecker 0:ab6014cc9c12 122 }
whdecker 0:ab6014cc9c12 123
whdecker 0:ab6014cc9c12 124 void setFrequency(long freq)
whdecker 0:ab6014cc9c12 125 {
whdecker 0:ab6014cc9c12 126 int new_frequency;
whdecker 0:ab6014cc9c12 127
whdecker 0:ab6014cc9c12 128 // New Range Checking... Implement the (experimentally determined) VFO bands:
whdecker 0:ab6014cc9c12 129 if (freq < 88500000) { // Band 3
whdecker 0:ab6014cc9c12 130 writeToReg(addr, 0x08, 0x1B);
whdecker 0:ab6014cc9c12 131 //Serial.println("Band 3");
whdecker 0:ab6014cc9c12 132 }
whdecker 0:ab6014cc9c12 133 else if (freq < 97900000) { // Band 2
whdecker 0:ab6014cc9c12 134 writeToReg(addr, 0x08, 0x1A);
whdecker 0:ab6014cc9c12 135 //Serial.println("Band 2");
whdecker 0:ab6014cc9c12 136 }
whdecker 0:ab6014cc9c12 137 else if (freq < 103000000) { // Band 1
whdecker 0:ab6014cc9c12 138 writeToReg(addr, 0x08, 0x19);
whdecker 0:ab6014cc9c12 139 //Serial.println("Band 1");
whdecker 0:ab6014cc9c12 140 }
whdecker 0:ab6014cc9c12 141 else { // Band 0
whdecker 0:ab6014cc9c12 142 // Must be OVER 103.000.000,
whdecker 0:ab6014cc9c12 143 writeToReg(addr, 0x08, 0x18);
whdecker 0:ab6014cc9c12 144 //Serial.println("Band 0");
whdecker 0:ab6014cc9c12 145 }
whdecker 0:ab6014cc9c12 146
whdecker 0:ab6014cc9c12 147 new_frequency = (freq + 304000) / 8192;
whdecker 0:ab6014cc9c12 148
whdecker 0:ab6014cc9c12 149 unsigned char reg3 = new_frequency & 255; //extract low byte of frequency register
whdecker 0:ab6014cc9c12 150 unsigned char reg4 = new_frequency >> 8; //extract high byte of frequency register
whdecker 0:ab6014cc9c12 151 writeToReg(addr, 0x03, reg3); //send low byte
whdecker 0:ab6014cc9c12 152 writeToReg(addr, 0x04, reg4); //send high byte
whdecker 0:ab6014cc9c12 153
whdecker 0:ab6014cc9c12 154 writeToReg(addr, 0x0E, 0x05); // Software reset
whdecker 0:ab6014cc9c12 155 }
whdecker 0:ab6014cc9c12 156
whdecker 0:ab6014cc9c12 157 void writeToReg(unsigned int addr, unsigned int reg, unsigned int data)
whdecker 0:ab6014cc9c12 158 {
whdecker 0:ab6014cc9c12 159 i2c.start();
whdecker 0:ab6014cc9c12 160 i2c.write(addr);
whdecker 0:ab6014cc9c12 161 i2c.write(reg);
whdecker 0:ab6014cc9c12 162 i2c.write(data);
whdecker 0:ab6014cc9c12 163 i2c.stop();
whdecker 0:ab6014cc9c12 164 }