migration

measure.c

@@ -0,0 +1,67 @@
+#include <xc.h>
+
+#include "measure.h"
+#include "mcc_generated_files/mcc.h"
+
+#define VOLTAGE_CHANNEL 0x5
+#define CURRENT_CHANNEL 0x6
+#define ADC_RESOLUTION  (1024 - 1)
+#define ADC_REFH        3300
+#define GAIN            66
+#define RESISTOR        3
+
+// Number of samples to do the averaging during measures
+#define AVERAGE_SAMPLES 8
+
+void adc_init(void)
+{
+	// TODO -> complete adc initialisation
+    //offsetCurrent = measure_current(0);
+
+}
+
+/**
+ * Read one ADC channel. This function is only
+ * local to this file.
+ *
+ * @param channel : the channel to be measured
+ * @return the ADC read value
+ */
+static uint16_t measure_adc(uint8_t channel)
+{
+	return (uint16_t) (ADC_GetConversion(channel));
+}
+
+
+
+uint16_t measure_voltage()
+{
+    uint32_t sum = 0;
+    
+    for(int i = 0; i < AVERAGE_SAMPLES; i++) {
+        sum += measure_adc(VOLTAGE_CHANNEL);
+    }
+    sum /= AVERAGE_SAMPLES;
+    sum = (sum * ADC_REFH) / ADC_RESOLUTION;
+    return (uint16_t)(sum);
+}
+
+uint16_t measure_current(uint16_t offset)
+{
+	uint32_t sum = 0;
+    for(int i = 0; i< AVERAGE_SAMPLES; i++){
+        sum += measure_adc(CURRENT_CHANNEL);
+    } 
+    uint32_t m = (sum / AVERAGE_SAMPLES);   // m is bits
+    m = (m * ADC_REFH) / ADC_RESOLUTION;    // m is mV
+    m *= 1000;                              // m is uV
+    m /= GAIN;
+    m /= RESISTOR;                          // m is uA
+    if(m <= offset){
+        m = 0;
+    } else {
+        m -= offset;
+    }
+    
+    return (uint16_t)m;
+}