Diff: main.cpp

Revision:

0:45bcb54bf7f8

diff -r 000000000000 -r 45bcb54bf7f8 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Nov 01 05:06:47 2022 +0000
@@ -0,0 +1,118 @@
+//reference
+//https://docs.google.com/document/d/197dgqlNFhn72JrBeSYGtR4Y7DJQRUKC61oHVD9dvLNY/edit
+#include "mbed.h"
+SPI ADC(p11,p12,p13);
+DigitalOut cs[2] = {p14, p26};
+Serial pc(USBTX, USBRX, 9600);
+#define START_BIT   0x04
+#define MODE_SINGLE 0x02    // Single-ended mode
+#define MODE_DIFF   0x00    // Differential mode
+uint16_t MCP3208_get(int channel, int adc_num);
+uint16_t HK_data[40];
+int rcmd = 0,cmdflag = 0, hk_num = 0; 
+uint16_t d;
+void commandget();
+void initialize();
+// for temp
+float R3 = 110;
+float R4 = 1000;
+float R5 = 68000;
+float Pt = 100;
+float R_1 = 3;
+float R_2 = 2;
+float I = 0.001;
+float Vreft = 2.5;
+float ce = 0.003851;
+float Rth, temp, volt;
+float Rse=0.02;
+float Gain=50;
+
+float gal;
+
+int main(void)
+{
+    int bit = 8;
+    float Vref = 5;
+    ADC.format(bit,0);
+    ADC.frequency(2000000); //VDD=5Vの場合は2MHz．
+    pc.printf("\r\n");
+    pc.printf("Hello, eps. This is MCP3208 test code.\r\n");
+    pc.printf("if you wanna start, press *a*. \r\n");
+    // for temp calucuration
+    float gain = -R5*I/R4;
+    float off = Vreft+I*R3;
+    
+    
+    while(1){
+        commandget();
+        if(cmdflag == 1){
+            if(rcmd == 'a'){
+                for(int adc_num = 0; adc_num < 2; adc_num++){
+                    for(int i = 0; i < 3; i++){
+                        HK_data[hk_num] = MCP3208_get(i, adc_num);
+                        pc.printf("ADC_num: %d, return = %d\n\r",adc_num, HK_data[hk_num]);
+                        hk_num++;
+                    }
+                }
+                //3.3V
+                pc.printf("CH[0]: Volt = %.5f[V]\n\r", Vref * (float)HK_data[0] / 4096);
+                //Temperature
+                volt = Vref*(float)HK_data[1] / 4096*(R_1 + R_2)/R_1;
+                Rth = (volt-off)/gain+R3;
+                temp = (Rth-Pt)/(ce*Pt);
+                pc.printf("CH[1]: Temp = %.5f[degree]\n\r", temp);
+                //Galvanometer
+                gal = Vref * (float)HK_data[2] / 4096/Gain/Rse;
+                pc.printf("CH[2]: Galvanometer = %.5f[A]\n\r", gal);
+            }
+        }
+        for(int j=0; j<hk_num; j++){
+            pc.printf("HK[%d]: %d\n\r", j, HK_data[j]);
+        } 
+        initialize();
+    }
+    
+    /*
+    
+    for(int i = 0; i < 10; i++){
+        uint16_t d = MCP3208_get(1);
+        HK_data[i] = d;
+        pc.printf("return=%d volt=%.5f\n\r", d, Vref * (float)d / 4096);
+        wait(1.0);
+    }
+    pc.printf("Sencing Finish\n\r");
+    pc.printf("Print HK_data\n\r");
+    
+    for(int i = 0; i < 10; i++){
+        pc.printf("HK_data[%d] = %d\n\r", i, HK_data[i]);
+    }
+    */
+}
+
+
+uint16_t MCP3208_get(int channel, int adc_num){
+    cs[adc_num] = 0;
+    pc.printf("Channel: %d, ", channel);
+    int command_high = START_BIT | MODE_SINGLE | ((channel & 0x04) >> 2);
+    int command_low = (channel & 0x03) << 6;
+    ADC.write(command_high);
+    int high_byte = ADC.write(command_low) & 0x0F;
+    int low_byte = ADC.write(0x00);
+    int conv_result = (high_byte << 8) | low_byte;
+    cs[adc_num] = 1;
+    return conv_result;
+}
+
+
+void commandget()
+{
+    rcmd = pc.getc();
+    cmdflag = 1;
+    pc.printf("get command: %d,%d\r\n",rcmd,cmdflag);
+}
+void initialize()
+{
+    rcmd = 0;
+    cmdflag = 0;
+    hk_num = 0;
+}