SonicMEMS@Cornell / Mbed 2 deprecated AD9833_matlab

Control AD8933 waveform generator chip from mBed interfacing with MATLAB

Dependencies:   mbed

main.cpp@0:15b3f9279b88, 2014-07-07 (annotated)

Committer:
pc445
Date:
Mon Jul 07 02:03:22 2014 +0000
Revision:
0:15b3f9279b88
communication with Matlab

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pc445 0:15b3f9279b88 1 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 2 // AD9833 control code
pc445 0:15b3f9279b88 3 // Create by Po-Cheng Chen 07-04-2014
pc445 0:15b3f9279b88 4 // Version 0.2 (MATLAB)
pc445 0:15b3f9279b88 5 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 6
pc445 0:15b3f9279b88 7 #include "mbed.h"
pc445 0:15b3f9279b88 8 #include "SPI.h"
pc445 0:15b3f9279b88 9 #include "DigitalOut.h"
pc445 0:15b3f9279b88 10
pc445 0:15b3f9279b88 11 SPI AD9833_SPI(p5, p6, p7); //mosi, miso, sclk --> don't need MISO
pc445 0:15b3f9279b88 12 DigitalOut fSync(p8); //use p8 as FSync data pin (same as chip select)
pc445 0:15b3f9279b88 13
pc445 0:15b3f9279b88 14 Serial pc(USBTX, USBRX); //define serial USB port
pc445 0:15b3f9279b88 15 DigitalOut myled1(LED1), myled2(LED2), myled3(LED3), myled4(LED4); //define LEDs
pc445 0:15b3f9279b88 16
pc445 0:15b3f9279b88 17 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 18 // ASCII to Interger function
pc445 0:15b3f9279b88 19 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 20 unsigned int ascii2int(char c)
pc445 0:15b3f9279b88 21 {
pc445 0:15b3f9279b88 22 unsigned int i;
pc445 0:15b3f9279b88 23 i = 0;
pc445 0:15b3f9279b88 24 switch(c) {
pc445 0:15b3f9279b88 25 case 0x20:
pc445 0:15b3f9279b88 26 i = 0;
pc445 0:15b3f9279b88 27 break;
pc445 0:15b3f9279b88 28 case '0' :
pc445 0:15b3f9279b88 29 i = 0;
pc445 0:15b3f9279b88 30 break;
pc445 0:15b3f9279b88 31 case '1' :
pc445 0:15b3f9279b88 32 i = 1;
pc445 0:15b3f9279b88 33 break;
pc445 0:15b3f9279b88 34 case '2' :
pc445 0:15b3f9279b88 35 i = 2;
pc445 0:15b3f9279b88 36 break;
pc445 0:15b3f9279b88 37 case '3' :
pc445 0:15b3f9279b88 38 i = 3;
pc445 0:15b3f9279b88 39 break;
pc445 0:15b3f9279b88 40 case '4' :
pc445 0:15b3f9279b88 41 i = 4;
pc445 0:15b3f9279b88 42 break;
pc445 0:15b3f9279b88 43 case '5' :
pc445 0:15b3f9279b88 44 i = 5;
pc445 0:15b3f9279b88 45 break;
pc445 0:15b3f9279b88 46 case '6' :
pc445 0:15b3f9279b88 47 i = 6;
pc445 0:15b3f9279b88 48 break;
pc445 0:15b3f9279b88 49 case '7' :
pc445 0:15b3f9279b88 50 i = 7;
pc445 0:15b3f9279b88 51 break;
pc445 0:15b3f9279b88 52 case '8' :
pc445 0:15b3f9279b88 53 i = 8;
pc445 0:15b3f9279b88 54 break;
pc445 0:15b3f9279b88 55 case '9' :
pc445 0:15b3f9279b88 56 i = 9;
pc445 0:15b3f9279b88 57 break;
pc445 0:15b3f9279b88 58 default:
pc445 0:15b3f9279b88 59 i = 0;
pc445 0:15b3f9279b88 60 break;
pc445 0:15b3f9279b88 61 }
pc445 0:15b3f9279b88 62 return i;
pc445 0:15b3f9279b88 63 }
pc445 0:15b3f9279b88 64 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 65 // 8 digit function
pc445 0:15b3f9279b88 66 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 67 unsigned int digit8(char c7, char c6, char c5, char c4,
pc445 0:15b3f9279b88 68 char c3, char c2, char c1, char c0)
pc445 0:15b3f9279b88 69 {
pc445 0:15b3f9279b88 70 unsigned int k7 = 10000000*ascii2int(c7);
pc445 0:15b3f9279b88 71 unsigned int k6 = 1000000*ascii2int(c6);
pc445 0:15b3f9279b88 72 unsigned int k5 = 100000*ascii2int(c5);
pc445 0:15b3f9279b88 73 unsigned int k4 = 10000*ascii2int(c4);
pc445 0:15b3f9279b88 74 unsigned int k3 = 1000*ascii2int(c3);
pc445 0:15b3f9279b88 75 unsigned int k2 = 100*ascii2int(c2);
pc445 0:15b3f9279b88 76 unsigned int k1 = 10*ascii2int(c1);
pc445 0:15b3f9279b88 77 unsigned int k0 = ascii2int(c0);
pc445 0:15b3f9279b88 78 unsigned int k = k7 + k6 + k5 + k4 + k3 + k2 + k1 + k0;
pc445 0:15b3f9279b88 79 return k;
pc445 0:15b3f9279b88 80 }
pc445 0:15b3f9279b88 81 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 82 // SPI initialization
pc445 0:15b3f9279b88 83 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 84 void SPI_INITIALIZATION()
pc445 0:15b3f9279b88 85 {
pc445 0:15b3f9279b88 86 //Setup the spi for 16 bit data, with 25MHz clock rate, mode 2
pc445 0:15b3f9279b88 87 // Note: mBed is MSB first SPI protocol
pc445 0:15b3f9279b88 88 AD9833_SPI.format(16,2);
pc445 0:15b3f9279b88 89 AD9833_SPI.frequency(25000000);
pc445 0:15b3f9279b88 90 fSync = 1;
pc445 0:15b3f9279b88 91 wait_ms(10);
pc445 0:15b3f9279b88 92 }
pc445 0:15b3f9279b88 93 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 94 // SPI writing
pc445 0:15b3f9279b88 95 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 96 void write_SPI(short dat)
pc445 0:15b3f9279b88 97 {
pc445 0:15b3f9279b88 98 fSync = 0;
pc445 0:15b3f9279b88 99 AD9833_SPI.write(dat);
pc445 0:15b3f9279b88 100 fSync = 1;
pc445 0:15b3f9279b88 101 }
pc445 0:15b3f9279b88 102 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 103 // Calculate desired frequency
pc445 0:15b3f9279b88 104 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 105 long calFreq(long freq)
pc445 0:15b3f9279b88 106 {
pc445 0:15b3f9279b88 107 long freq_cal; //define freq calculated value
pc445 0:15b3f9279b88 108 float freq_val = 0.00000000; //define ferq calculate tempotary value
pc445 0:15b3f9279b88 109
pc445 0:15b3f9279b88 110 //calculate the frqe reg value
pc445 0:15b3f9279b88 111 //((desired frequency)/(reference frequency)) x 0x10000000.
pc445 0:15b3f9279b88 112 freq_val = (((float)(freq))/25000000);
pc445 0:15b3f9279b88 113 freq_cal = freq_val*0x10000000;
pc445 0:15b3f9279b88 114 return freq_cal;
pc445 0:15b3f9279b88 115 }
pc445 0:15b3f9279b88 116 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 117 // Set frequency register
pc445 0:15b3f9279b88 118 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 119 void setFreq(long frequency)
pc445 0:15b3f9279b88 120 {
pc445 0:15b3f9279b88 121 int freq_MSB; //define freq MSB reg value
pc445 0:15b3f9279b88 122 int freq_LSB; //define freq LSB reg value
pc445 0:15b3f9279b88 123
pc445 0:15b3f9279b88 124 long freq_cal = calFreq(frequency); //calculate the frequency register
pc445 0:15b3f9279b88 125
pc445 0:15b3f9279b88 126 freq_MSB = (int)((freq_cal & 0xFFFC000)>>14); // shift 14 bits
pc445 0:15b3f9279b88 127 freq_LSB = (int)(freq_cal & 0x3FFF);
pc445 0:15b3f9279b88 128
pc445 0:15b3f9279b88 129 freq_MSB = freq_MSB | 0x4000; //assign freq reg address
pc445 0:15b3f9279b88 130 freq_LSB = freq_LSB | 0x4000;
pc445 0:15b3f9279b88 131 ///////////////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 132 //print the data from the serial port to verifiy the function
pc445 0:15b3f9279b88 133 //printf("freq_LSB 0x%x\n\r", freq_LSB);
pc445 0:15b3f9279b88 134 //printf("freq_MSB 0x%x\n\r", freq_MSB);
pc445 0:15b3f9279b88 135 ///////////////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 136 write_SPI(0x2100); //write control reg - apply reset
pc445 0:15b3f9279b88 137 write_SPI(freq_LSB); //write freq reg - LSB
pc445 0:15b3f9279b88 138 write_SPI(freq_MSB); //write freq reg - MSB
pc445 0:15b3f9279b88 139 write_SPI(0xC000); //write phase reg - (0 for now)
pc445 0:15b3f9279b88 140 write_SPI(0x2000); //write control reg - disable reset
pc445 0:15b3f9279b88 141 }
pc445 0:15b3f9279b88 142
pc445 0:15b3f9279b88 143 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 144 // Main function
pc445 0:15b3f9279b88 145 // Comments:include the command line from Matlab
pc445 0:15b3f9279b88 146 // Control from COM port
pc445 0:15b3f9279b88 147 /////////////////////////////////////////////////////////////////////////
pc445 0:15b3f9279b88 148 int main()
pc445 0:15b3f9279b88 149 {
pc445 0:15b3f9279b88 150 char buf[128]; // assign buffer for the command from PC
pc445 0:15b3f9279b88 151 SPI_INITIALIZATION(); // initialized the SPI
pc445 0:15b3f9279b88 152 while(true) {
pc445 0:15b3f9279b88 153 if (pc.readable()) {
pc445 0:15b3f9279b88 154 //WAV AAAA BBBB CCCC DDDD EEEE FFFF GGGG HHHH END \n \0
pc445 0:15b3f9279b88 155 //A, B, C, D ,E, F, G, H are frequency numbers
pc445 0:15b3f9279b88 156 //need 3 + (32) + 3 + 1 + 1 = 40
pc445 0:15b3f9279b88 157 pc.gets(buf, 16);
pc445 0:15b3f9279b88 158 if ((buf[0] == 'W')&&(buf[1] == 'A')&&(buf[2] == 'V')&&(buf[11] == 'E')&&(buf[12] == 'N')&&(buf[13] == 'D')) {
pc445 0:15b3f9279b88 159 myled1 = !myled1;
pc445 0:15b3f9279b88 160 int freq_pc = digit8(buf[3], buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], buf[10]);
pc445 0:15b3f9279b88 161 setFreq(freq_pc);
pc445 0:15b3f9279b88 162
pc445 0:15b3f9279b88 163 } // end of if( buffer read)
pc445 0:15b3f9279b88 164 } // end of if(pc.readable())
pc445 0:15b3f9279b88 165 }// end of while()
pc445 0:15b3f9279b88 166 } // end of main()