pt100 temp sensing

gui-framework
Ondřej Hruška 4 years ago
parent daf220600e
commit 0e1e40254b
Signed by: MightyPork
GPG Key ID: 2C5FD5035250423D
  1. 2
      main/CMakeLists.txt
  2. 72
      main/analog.c
  3. 14
      main/analog.h
  4. 3
      main/app_main.c
  5. 42
      main/gui.c

@ -1,4 +1,4 @@
set(COMPONENT_SRCS "app_main.c" "nokia.c" "knob.c" "gui.c")
set(COMPONENT_SRCS "app_main.c" "nokia.c" "knob.c" "gui.c" "analog.c")
set(COMPONENT_ADD_INCLUDEDIRS "")
register_component()

@ -0,0 +1,72 @@
#include <stdint.h>
#include <stdatomic.h>
#include "analog.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
static esp_adc_cal_characteristics_t *adc_chars;
// 32-39
static const adc1_channel_t channel = ADC1_CHANNEL_4; //GPIO34 if ADC1, GPIO14 if ADC2
static float measurement_celsius;
static const adc_atten_t atten = ADC_ATTEN_DB_0;
static const adc_unit_t unit = ADC_UNIT_1;
static void analog_service(void *arg);
static TaskHandle_t hAnalog;
#define DEFAULT_VREF 1100
#define NO_OF_SAMPLES 64
void analog_init() {
printf("Analog init\n");
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(channel, atten);
adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
esp_adc_cal_characterize(unit, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);
int rv = xTaskCreate(analog_service, "analog", 4096, NULL, 6, &hAnalog);
assert (rv == pdPASS);
}
static void __attribute__((noreturn)) analog_service(void *arg) {
while (1) {
uint32_t adc_reading = 0;
//Multisampling
for (int i = 0; i < NO_OF_SAMPLES; i++) {
adc_reading += adc1_get_raw(channel);
}
adc_reading /= NO_OF_SAMPLES;
//Convert adc_reading to voltage in mV
uint32_t voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars);
#define CORRECT -10;
voltage += CORRECT;
// printf("Raw: %d ... Voltage: %dmV ...", adc_reading, voltage);
float volts = voltage * 0.001f;
#define R1 4750
#define V1 3.3f
float r_pt100 = (volts * R1)/(V1 - volts);
float celsius = (r_pt100/100.0f - 1.0f) / 3.9083E-3f;
// printf("Rpt %.3f, Celsius: %.1f\n", r_pt100, celsius);
measurement_celsius = celsius;
vTaskDelay(pdMS_TO_TICKS(100));
}
}
float analog_read() {
return measurement_celsius;
}

@ -0,0 +1,14 @@
/**
* TODO file description
*
* Created on 2020/01/03.
*/
#ifndef REFLOWER_ANALOG_H
#define REFLOWER_ANALOG_H
void analog_init();
float analog_read();
#endif //REFLOWER_ANALOG_H

@ -14,6 +14,7 @@
#include "nokia.h"
#include "knob.h"
#include "gui.h"
#include "analog.h"
void __attribute__((noreturn)) app_main()
@ -28,8 +29,8 @@ void __attribute__((noreturn)) app_main()
gui_init();
knob_init();
analog_init();
bool level = 0;
while (1) {

@ -1,5 +1,6 @@
#include "gui.h"
#include "nokia.h"
#include "analog.h"
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
@ -32,12 +33,15 @@ void gui_init() {
* @param arg
*/
static void __attribute__((noreturn)) gui_thread(void *arg) {
uint32_t pos = 20;
uint32_t pos = 0;
bool btn = 0;
uint32_t last_wheel_time = 0;
#define NMAX 60
while (1) {
uint32_t value = 0;
xTaskNotifyWait(0, ULONG_MAX, &value, portMAX_DELAY);
xTaskNotifyWait(0, ULONG_MAX, &value, pdMS_TO_TICKS(250));
// printf("Knob event 0x%02x ", value);
if (value & 0b1000) {
@ -47,23 +51,27 @@ static void __attribute__((noreturn)) gui_thread(void *arg) {
btn = 0;
}
if (value & 0b01) {
// printf("FWD ");
if (pos == NMAX) {
pos = 0;
}
else {
pos += 1;
if (value & 0b11) {
uint32_t time = xTaskGetTickCount();
uint32_t increment = 1;
if (last_wheel_time != 0) {
uint32_t ela = time - last_wheel_time;
if (ela < pdMS_TO_TICKS(20)) {
increment = 25;
} else if (ela < pdMS_TO_TICKS(35)) {
increment = 10;
} else if (ela < pdMS_TO_TICKS(75)) {
increment = 5;
}
}
}
last_wheel_time = time;
if (value & 0b10) {
// printf("BACK ");
if (pos == 0) {
pos = NMAX;
if (value & 0b01) {
pos += increment;
}
else {
pos--;
if (value & 0b10) {
pos -= increment;
}
}
@ -71,6 +79,8 @@ static void __attribute__((noreturn)) gui_thread(void *arg) {
char buf[10];
sprintf(buf, "%3d %s", pos, btn?"BTN":"");
LCD_setStr(buf, 2, 17, 0);
sprintf(buf, "%.0f C", analog_read());
LCD_setStr(buf, 2, 26, 0);
LCD_updateDisplay();
// printf(">");

Loading…
Cancel
Save