main.cpp

00001 //reference
00002 //https://docs.google.com/document/d/197dgqlNFhn72JrBeSYGtR4Y7DJQRUKC61oHVD9dvLNY/edit
00003 #include "mbed.h"
00004 SPI ADC(p11,p12,p13);
00005 DigitalOut cs[2] = {p14, p26};
00006 Serial pc(USBTX, USBRX, 9600);
00007 #define START_BIT   0x04
00008 #define MODE_SINGLE 0x02    // Single-ended mode
00009 #define MODE_DIFF   0x00    // Differential mode
00010 uint16_t MCP3208_get(int channel, int adc_num);
00011 uint16_t HK_data[40];
00012 int rcmd = 0,cmdflag = 0, hk_num = 0; 
00013 uint16_t d;
00014 void commandget();
00015 void initialize();
00016 // for temp
00017 float R3 = 110;
00018 float R4 = 1000;
00019 float R5 = 68000;
00020 float Pt = 100;
00021 float R_1 = 3;
00022 float R_2 = 2;
00023 float I = 0.001;
00024 float Vreft = 2.5;
00025 float ce = 0.003851;
00026 float Rth, temp, volt;
00027 float Rtha, tempa, volta;
00028 float Rthb, tempb, voltb;
00029 float Rthc, tempc, voltc;
00030 float Rthd, tempd, voltd;
00031 float Rthe, tempe, volte;
00032 float Rthf, tempf, voltf;
00033 float Rthg, tempg, voltg;
00034 float Rse=0.05;
00035 float Gain=50;
00036 
00037 float gal;
00038 
00039 int main(void)
00040 {
00041     int bit = 8;
00042     float Vref = 5;
00043     ADC.format(bit,0);
00044     ADC.frequency(2000000); //VDD=5Vの場合は2MHz．
00045     pc.printf("\r\n");
00046     pc.printf("Hello, eps. This is MCP3208 test code.\r\n");
00047     pc.printf("if you wanna start, press *a*. \r\n");
00048     // for temp calucuration
00049     float gain = -R5*I/R4;
00050     float off = Vreft+I*R3;
00051     
00052     
00053     while(1){
00054         commandget();
00055         if(cmdflag == 1){
00056             if(rcmd == 'a'){
00057                 for(int adc_num = 0; adc_num < 2; adc_num++){
00058                     for(int i = 0; i < 8; i++){
00059                         HK_data[hk_num] = MCP3208_get(i, adc_num);
00060                         pc.printf("i = %d, ADC_num: %d, return = %d\n\r",i, adc_num, HK_data[hk_num]);
00061                         hk_num++;
00062                     }
00063                 }
00064                 //3.3V
00065                 //pc.printf("ADC_num: 0, CH[0]: Volt = %.5f[V]\n\r", Vref * (float)HK_data[0] / 4096);
00066                 //Temperature
00067                 volt = Vref*(float)HK_data[0] / 4096*(R_1 + R_2)/R_1;
00068                 Rth = (volt-off)/gain+R3;
00069                 temp = (Rth-Pt)/(ce*Pt);
00070                 
00071                 volta = Vref*(float)HK_data[1] / 4096*(R_1 + R_2)/R_1;
00072                 Rtha = (volta-off)/gain+R3;
00073                 tempa = (Rtha-Pt)/(ce*Pt);
00074                 
00075                 voltb = Vref*(float)HK_data[2] / 4096*(R_1 + R_2)/R_1;
00076                 Rthb = (voltb-off)/gain+R3;
00077                 tempb = (Rthb-Pt)/(ce*Pt);
00078                 
00079                  
00080                 voltc = Vref*(float)HK_data[3] / 4096*(R_1 + R_2)/R_1;
00081                 Rthc = (voltc-off)/gain+R3;
00082                 tempc = (Rthc-Pt)/(ce*Pt);
00083                 
00084                 voltd = Vref*(float)HK_data[4] / 4096*(R_1 + R_2)/R_1;
00085                 Rthd = (voltd-off)/gain+R3;
00086                 tempd = (Rthd-Pt)/(ce*Pt);
00087                 
00088                 volte = Vref*(float)HK_data[5] / 4096*(R_1 + R_2)/R_1;
00089                 Rthe = (volte-off)/gain+R3;
00090                 tempe = (Rthe-Pt)/(ce*Pt);
00091                 
00092                 voltf = Vref*(float)HK_data[6] / 4096*(R_1 + R_2)/R_1;
00093                 Rthf = (voltf-off)/gain+R3;
00094                 tempf = (Rthf-Pt)/(ce*Pt);
00095                 
00096                 voltg = Vref*(float)HK_data[7] / 4096*(R_1 + R_2)/R_1;
00097                 Rthg = (voltg-off)/gain+R3;
00098                 tempg = (Rthg-Pt)/(ce*Pt);
00099                 
00100                 
00101                 pc.printf("ADC_num: 0, CH[0]: Temp = %.5f[degree]\n\r", temp);
00102                 pc.printf("ADC_num: 0, CH[1]: Temp = %.5f[degree]\n\r", tempa);
00103                 pc.printf("ADC_num: 0, CH[2]: Temp = %.5f[degree]\n\r", tempb);
00104                 pc.printf("ADC_num: 0, CH[3]: Temp = %.5f[degree]\n\r", tempc);
00105                 pc.printf("ADC_num: 0, CH[4]: Temp = %.5f[degree]\n\r", tempd);
00106                 pc.printf("ADC_num: 0, CH[5]: Temp = %.5f[degree]\n\r", tempe);
00107                 pc.printf("ADC_num: 0, CH[6]: Temp = %.5f[degree]\n\r", tempf);
00108                 pc.printf("ADC_num: 0, CH[7]: Temp = %.5f[degree]\n\r", tempg);
00109                 
00110                 //Galvanometer
00111                 //gal = Vref * (float)HK_data[2] / 4096/Gain/Rse;
00112                 //pc.printf("ADC_num: 0, CH[2]: Galvanometer = %.5f[A]\n\r", gal);
00113                 //pc.printf("ADC_num: 1, CH[0]: Volt = %.5f[V]\n\r", Vref * (float)HK_data[3] / 4096);
00114                 //pc.printf("ADC_num: 1, CH[1]: Volt = %.5f[V]\n\r", Vref * (float)HK_data[4] / 4096);
00115                 //pc.printf("ADC_num: 1, CH[2]: Volt = %.5f[V]\n\r", Vref * (float)HK_data[5] / 4096);
00116             }
00117         }
00118         for(int j=0; j<hk_num; j++){
00119             pc.printf("HK[%d]: %d\n\r", j, HK_data[j]);
00120         } 
00121         initialize();
00122     }
00123     
00124 }
00125 
00126 
00127 uint16_t MCP3208_get(int channel, int adc_num){
00128     cs[adc_num] = 0;
00129     pc.printf("Channel: %d, ", channel);
00130     int command_high = START_BIT | MODE_SINGLE | ((channel & 0x04) >> 2);
00131     int command_low = (channel & 0x03) << 6;
00132     ADC.write(command_high);
00133     int high_byte = ADC.write(command_low) & 0x0F;
00134     int low_byte = ADC.write(0x00);
00135     int conv_result = (high_byte << 8) | low_byte;
00136     cs[adc_num] = 1;
00137     return conv_result;
00138 }
00139 
00140 
00141 void commandget()
00142 {
00143     rcmd = pc.getc();
00144     cmdflag = 1;
00145     pc.printf("get command: %d,%d\r\n",rcmd,cmdflag);
00146 }
00147 void initialize()
00148 {
00149     rcmd = 0;
00150     cmdflag = 0;
00151     hk_num = 0;
00152 }