adc working

src/measure.c

@@ -0,0 +1,59 @@
+/*
+ * adc.cpp
+ *
+ *  Created on: 03.10.2014
+ *      Author: wn
+ */
+
+#include <msp430g2553.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "measure.h"
+#include "PontCoopScheduler.h"
+#include "display.h"
+#include "gpio.h"
+
+
+const float R_REF = 3000.0;
+const uint16_t N_MAX = 1023;
+const float PT1000_R0 = 1000.0;
+const float PT1000_Coeff = 3.85e-3;
+
+
+
+void measureInit(void *handleArg) {
+	ADC10CTL0 = SREF1 | ADC10SHT_3 | ADC10SR | REFOUT | REFON | REF2_5V | ADC10ON;
+	ADC10CTL1 = INCH_3;
+	ADC10AE0 = BIT3;
+}
+
+void measureCollectAndProcessConversion(void *handleArg);
+
+void measureStartConversion(void *handleArg) {
+	gpioSetPin(TESTPIN1, HIGH);
+	ADC10CTL0 |= ENC | ADC10SC;
+	schAdd(measureCollectAndProcessConversion, NULL, 10, 0);
+	gpioSetPin(TESTPIN1, LOW);
+}
+
+void measureCollectAndProcessConversion(void *handleArg) {
+	gpioSetPin(TESTPIN2, HIGH);
+	uint16_t n = 0xffff;
+	if ((ADC10CTL0 & ADC10IFG) != 0) {
+		n = ADC10MEM;
+		ADC10CTL0 &= ~(ADC10IFG | ENC);
+	}
+
+    // process adcValue
+	// store result in variable temperature
+	float r = ((((float)N_MAX) / ((float)n)) - 1.0) * R_REF;
+	float t = (r / PT1000_R0 - 1) / PT1000_Coeff;
+
+	uint8_t temperature = (uint8_t)t;
+
+	displaySetValue(temperature);
+	gpioSetPin(TESTPIN2, LOW);
+}
+
+