main.cpp

00001 #include "mbed.h"
00002 #include "ADS1220.h"
00003 #include "math.h"
00004 
00005 
00006 #define PGA 128                                     // Programmable Gain = 1
00007 #define VREF 5.0                                    // Internal reference of 2.048V
00008 #define VFSR VREF/PGA             
00009 #define FSR (((long int)1<<23)) 
00010 #define LSB_Size (VFSR/FSR) 
00011 
00012 ADS1220 ads1220_com(SPI_MOSI, SPI_MISO, SPI_SCK,SPI_CS);
00013 Serial data_serial(USBTX, USBRX);
00014 InterruptIn DRDY(PC_5);
00015 
00016 
00017 
00018 
00019 
00020 bool New_data_avialable;
00021 void ext_int_DRDY(void);
00022 float code2volt(float c);
00023 
00024 signed long tData;
00025 float volt;
00026 
00027 int main() 
00028 {
00029    data_serial.baud(115200);
00030    wait(0.1);
00031    DRDY.rise(&ext_int_DRDY);
00032    ads1220_com.Config(); 
00033    ads1220_com.SendStartCommand();
00034    while(1) 
00035    {
00036          if(New_data_avialable)
00037           {
00038             New_data_avialable = 0;
00039             tData = ads1220_com.ReadData();
00040             volt = code2volt(tData);
00041             data_serial.printf("\rVoltage : %f\n",volt);
00042           }
00043    }
00044 }
00045 
00046 float code2volt(float c)
00047 {
00048      float Vout = 0;
00049      Vout = (float)(c*LSB_Size*1000);    //In  mV
00050    return Vout;
00051 }
00052 
00053 void ext_int_DRDY(void)
00054 {
00055   New_data_avialable = 1;
00056 }