Diff: AD7989.cpp

Revision:

0:64eaedfa13a2

Child:

8:b143706d6c43

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AD7989.cpp	Mon Jan 21 16:55:48 2019 +0000
@@ -0,0 +1,51 @@
+#include "AD7989.h"
+
+const float AD7989_Driver::zero_point = 5.0;
+
+AD7989_Driver::AD7989_Driver(SPI *SPI_BUS, DigitalOut *Chip_Select,  DigitalOut *Convert)
+{
+  ADC_SPI = SPI_BUS;
+  CS = Chip_Select;
+  ADC_CONV = Convert;
+}
+
+double AD7989_Driver::sample()
+{
+  long raw;
+  long bits;
+  ADC_CONV->write(1);
+  wait_us(2);
+  CS->write(0);
+  raw = 0;
+  bits = (ADC_SPI->write(0x00)) << 16;
+  //printf("First Octet = 0x%X \n",bits);
+  raw = bits;
+  bits = 0;
+  bits = (ADC_SPI->write(0x00)) << 8;
+  //printf("Second Octet = 0x%X \n",bits);
+  raw = bits + raw;
+  bits = 0;
+  bits = (ADC_SPI->write(0x00));
+  CS->write(1);
+  ADC_CONV->write(0);
+  //printf("Third Octet = 0x%X \n",bits);
+  raw = bits + raw;
+  bits = 0;
+  raw = raw >> 6;
+  //converts 2's complement 18 bit number into a 32 bit signed 2's complement number
+  raw = (raw >> 17) == 0 ? raw : (0xFFFFFFFF ^ 0x3FFFF) | raw;
+  volts = (static_cast<double>(raw)/(pow(2.0,18)));
+  volts = (volts*10.0)-zero_point; //This assumed you are using a 5 volt Vref
+  //pc.printf("%f \n", volts);
+  return volts;
+}
+
+double AD7989_Driver::sample_avg(int num_avgs)
+{
+  double temp = 0.0;
+  for(int = 0; i < num_avgs; i++)
+  {
+    temp = temp + sample();
+  }
+  temp = temp/num_avgs;
+}
\ No newline at end of file