09ee67f583
- create new files with code for demultiplexing the 4 switches from the one analog signal - define lookup table with measurements done with the build pcb, test switches and esp32 breakout board - add note do config that gpio used for digital in is now used for this multiplexer - main.cpp: disable control task, run new handle function in a loop for testing
98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
#include "switchesAnalog.hpp"
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#define CHECK_BIT(var,pos) (((var)>>(pos)) & 1) //TODO duplicate code: same macro already used in vfd.cpp
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//=============================
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//========= readAdc ===========
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//=============================
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//TODO add this to gpio library - used multiple times in this project
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//function for multisampling an anlog input
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int readAdc(adc1_channel_t adc_channel, bool inverted = false) {
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//make multiple measurements
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int adc_reading = 0;
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for (int i = 0; i < 16; i++) {
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adc_reading += adc1_get_raw(adc_channel);
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}
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adc_reading = adc_reading / 16;
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//return original or inverted result
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if (inverted) {
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return 4095 - adc_reading;
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} else {
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return adc_reading;
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}
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}
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//=====================
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//===== Variables =====
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//=====================
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static const char *TAG = "switches-analog"; //tag for logging
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int diffMin = 4095;
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int adcValue;
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int match_index = 0;
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//array that describes voltages for all combinations of the 4 inputs
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const int lookup_voltages[] = {
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//ADC, S3 S2 S1 S0
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4095, //0000
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3642, //0001
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3243, //0010
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2887, //0011
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2628, //0100
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2413, //0101
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2274, //0110
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2112, //0111
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1864, //1000
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1748, //1001
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1671, //1010
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1579, //1011
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1488, //1100
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1418, //1101
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1360, //1110
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1294 //1111
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};
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//===========================
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//===== handle function =====
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//===========================
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void switchesAnalog_handle(){
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//read current voltage
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adcValue = readAdc(ADC_CHANNEL_BUTTONS);
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ESP_LOGI(TAG, "voltage read: %d", adcValue);
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//find closest match in lookup table
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for (int i=0; i<16; i++){
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int diff = fabs(adcValue - lookup_voltages[i]);
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if (diff < diffMin){
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diffMin = diff;
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match_index = i;
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}
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}
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//get bool values for each input from matched index
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bool s0 = CHECK_BIT(match_index, 0);
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bool s1 = CHECK_BIT(match_index, 1);
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bool s2 = CHECK_BIT(match_index, 2);
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bool s3 = CHECK_BIT(match_index, 3);
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//bool s1 = ((match_index & 0b1000) == 0b1000);
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//bool s2 = ((match_index & 0b0100) == 0b0100);
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//bool s3 = ((match_index & 0b0010) == 0b0010);
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//bool s4 = ((match_index & 0b0001) == 0b0001);
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//log results
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ESP_LOGI(TAG, "adcRead: %d, closest-match: %d, diff: %d, index: %d, switches: %d%d%d%d",
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adcValue, lookup_voltages[match_index], diffMin, match_index, (int)s3, (int)s2, (int)s1, (int)s0);
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}
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