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/*
* Analog.c
*
* Created on: 20 Sep 2016
* Author: ralim
* Contains the functions related to reading and scaling the adc pins
* This is used for temperature and battery voltage sense
*/
#include "Analog.h"
//Reads the dc input and returns it as X10 voltage (ie 236 = 23.6V)
//Seems unstable below 9.5V input
uint16_t readDCVoltage() {
uint16_t reading = 0;
for (u8 i = 0; i < 10; i++) {
reading += ADC_GetConversionValue(ADC2);
}
reading /= 144; //take the average and convert to X10 voltage
return reading; //return the read voltage
}
//This reads the thermocouple in the tip
//This allows us to read it in X10 mode
//Returns temperature in C X10 mode
int16_t readTipTemp() {
static uint32_t rollingAverage[4];
static uint8_t rIndex = 0;
/*The head has a thermocouple inline with the heater
This is read by turning off the heater
Then read the output of the op-amp that is connected across the connections
*/
uint32_t ad_sum = 0;
uint32_t max = 0, min;
uint32_t ad_value, avg_data;
uint32_t timer = getIronTimer();
setIronTimer(0); //set the remaining time to zero
HEAT_OFF(); //heater must be off
delayMs(5); //wait for the heater to time out
uint8_t gMeas_cnt = 9; //how many measurements to make
max = ad_sum = min = Get_ADC1Value(0);
while (gMeas_cnt > 0) {
ad_value = Get_ADC1Value(0);
ad_sum += ad_value;
if (ad_value > max)
max = ad_value;
if (ad_value < min)
min = ad_value;
gMeas_cnt--;
}
setIronTimer(timer);
ad_sum = ad_sum - max - min; //remove the two outliers
avg_data = ad_sum / 8; //take the average
rollingAverage[rIndex] = avg_data;
rIndex = (rIndex + 1) % 4;
return (rollingAverage[0] + rollingAverage[1] + rollingAverage[2]
+ rollingAverage[3]) / 4; //get the average
}
/*******************************************************************************
Function:
Description:Reads the temperature of the on board temp sensor for calibration
http://www.analog.com/media/en/technical-documentation/data-sheets/TMP35_36_37.pdf
Output: The onboardTemp in C X 10
*******************************************************************************/
int readSensorTemp(void) {
static uint32_t rollingAverage[4];
static uint8_t rIndex = 0;
u32 ad_sum = 0;
u32 max, min;
u32 ad_value, avg_data, slide_data;
u8 gMeas_cnt = 9;
ad_sum = min = max = Get_ADC1Value(1);
while (gMeas_cnt > 0) {
ad_value = Get_ADC1Value(1);
ad_sum += ad_value;
if (ad_value > max)
max = ad_value;
if (ad_value < min)
min = ad_value;
gMeas_cnt--;
}
ad_sum = ad_sum - max - min;
avg_data = ad_sum / 8;
//^ Removes the two outliers from the data spread
rollingAverage[rIndex] = avg_data; //store this result
rIndex = (rIndex + 1) % 4; //move the index
slide_data = (rollingAverage[0] + rollingAverage[1] + rollingAverage[2]
+ rollingAverage[3]) / 4; //get the average
return (250 + (3300 * slide_data / 4096) - 750);
//(25 + ((10*(33*gSlide_data)/4096)-75));
//^ Convert the reading to C
}
volatile uint16_t ADC1ConvertedValue[2];
//returns the latest reading from ADC1 that was buffered using DMA
uint16_t Get_ADC1Value(uint8_t i) {
return ADC1ConvertedValue[i];
}
//This returns the calibrated temperature reading of the iron temp
//inputs : calibration value / wether to take a new reading or not
uint16_t readIronTemp(uint16_t calibration_temp, uint8_t read) {
static uint16_t calTemp = 0;
static uint16_t lastVal = 0;
if (calibration_temp != 0)
calTemp = calibration_temp;
if (read) {
lastVal = (readTipTemp() * 1000 + 806 * readSensorTemp()
- calTemp * 1000) / 806;
}
return lastVal;
}
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