mirror of
https://github.com/DarkFlippers/unleashed-firmware.git
synced 2024-12-16 01:02:32 +03:00
299 lines
9.7 KiB
C
299 lines
9.7 KiB
C
/* Flipper App to read the values from a HTU21D Sensor */
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/* Created by Mywk - https://github.com/Mywk - https://mywk.net */
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#include <furi.h>
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#include <furi_hal.h>
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#include <furi_hal_i2c.h>
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#include <math.h>
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#include <gui/gui.h>
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#include <input/input.h>
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#include <notification/notification_messages.h>
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#include <string.h>
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#define TS_DEFAULT_VALUE 0xFFFF
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#define HTU21D_ADDRESS (0x40 << 1)
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#define HTU21D_CMD_TEMPERATURE 0xE3
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#define HTU21D_CMD_HUMIDITY 0xE5
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#define DATA_BUFFER_SIZE 8
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// External I2C BUS
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#define I2C_BUS &furi_hal_i2c_handle_external
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typedef enum {
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TSSInitializing,
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TSSNoSensor,
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TSSPendingUpdate,
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} TSStatus;
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typedef enum {
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TSEventTypeTick,
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TSEventTypeInput,
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} TSEventType;
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typedef struct {
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TSEventType type;
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InputEvent input;
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} TSEvent;
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extern const NotificationSequence sequence_blink_red_100;
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extern const NotificationSequence sequence_blink_blue_100;
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static TSStatus temperature_sensor_current_status = TSSInitializing;
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// Temperature and Humidity data buffers, ready to print
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char ts_data_buffer_temperature_c[DATA_BUFFER_SIZE];
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char ts_data_buffer_temperature_f[DATA_BUFFER_SIZE];
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char ts_data_buffer_relative_humidity[DATA_BUFFER_SIZE];
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char ts_data_buffer_absolute_humidity[DATA_BUFFER_SIZE];
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// <sumary>
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// Executes an I2C cmd (trx)
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// </sumary>
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// <returns>
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// true if fetch was successful, false otherwise
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// </returns>
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static bool temperature_sensor_cmd(uint8_t cmd, uint8_t* buffer, uint8_t size) {
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uint32_t timeout = furi_ms_to_ticks(100);
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bool ret = false;
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// Aquire I2C and check if device is ready, then release
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furi_hal_i2c_acquire(I2C_BUS);
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if(furi_hal_i2c_is_device_ready(I2C_BUS, HTU21D_ADDRESS, timeout)) {
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furi_hal_i2c_release(I2C_BUS);
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furi_hal_i2c_acquire(I2C_BUS);
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// Transmit given command
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ret = furi_hal_i2c_tx(I2C_BUS, HTU21D_ADDRESS, &cmd, 1, timeout);
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furi_hal_i2c_release(I2C_BUS);
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if(ret) {
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uint32_t wait_ticks = furi_ms_to_ticks(50);
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furi_delay_tick(wait_ticks);
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furi_hal_i2c_acquire(I2C_BUS);
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// Receive data
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ret = furi_hal_i2c_rx(I2C_BUS, HTU21D_ADDRESS, buffer, size, timeout);
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furi_hal_i2c_release(I2C_BUS);
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}
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} else {
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furi_hal_i2c_release(I2C_BUS);
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}
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return ret;
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}
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// <sumary>
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// Fetches temperature and humidity from sensor
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// </sumary>
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// <remarks>
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// Temperature and humidity must be preallocated
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// Note: CRC is not checked (3rd byte)
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// </remarks>
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// <returns>
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// true if fetch was successful, false otherwise
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// </returns>
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static bool temperature_sensor_fetch_data(double* temperature, double* humidity) {
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bool ret = false;
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uint16_t adc_raw;
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uint8_t buffer[2] = {0x00};
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// Fetch temperature
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ret = temperature_sensor_cmd((uint8_t)HTU21D_CMD_TEMPERATURE, buffer, 2);
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if(ret) {
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// Calculate temperature
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adc_raw = ((uint16_t)(buffer[0] << 8) | (buffer[1]));
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*temperature = (float)(adc_raw * 175.72 / 65536.00) - 46.85;
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// Fetch humidity
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ret = temperature_sensor_cmd((uint8_t)HTU21D_CMD_TEMPERATURE, buffer, 2);
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if(ret) {
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// Calculate humidity
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adc_raw = ((uint16_t)(buffer[0] << 8) | (buffer[1]));
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*humidity = (float)(adc_raw * 125.0 / 65536.00) - 6.0;
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}
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}
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return ret;
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}
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// <sumary>
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// Draw callback
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// </sumary>
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static void temperature_sensor_draw_callback(Canvas* canvas, void* ctx) {
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UNUSED(ctx);
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canvas_clear(canvas);
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canvas_set_font(canvas, FontPrimary);
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canvas_draw_str(canvas, 2, 10, "HTU21D/Si7021 Sensor");
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canvas_set_font(canvas, FontSecondary);
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canvas_draw_str(canvas, 2, 62, "Press back to exit.");
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switch(temperature_sensor_current_status) {
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case TSSInitializing:
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canvas_draw_str(canvas, 2, 30, "Initializing..");
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break;
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case TSSNoSensor:
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canvas_draw_str(canvas, 2, 30, "No sensor found!");
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break;
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case TSSPendingUpdate: {
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canvas_draw_str(canvas, 3, 24, "Temperature");
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canvas_draw_str(canvas, 68, 24, "Humidity");
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// Draw vertical lines
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canvas_draw_line(canvas, 61, 16, 61, 50);
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canvas_draw_line(canvas, 62, 16, 62, 50);
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// Draw horizontal line
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canvas_draw_line(canvas, 2, 27, 122, 27);
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// Draw temperature and humidity values
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canvas_draw_str(canvas, 8, 38, ts_data_buffer_temperature_c);
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canvas_draw_str(canvas, 42, 38, "C");
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canvas_draw_str(canvas, 8, 48, ts_data_buffer_temperature_f);
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canvas_draw_str(canvas, 42, 48, "F");
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canvas_draw_str(canvas, 68, 38, ts_data_buffer_relative_humidity);
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canvas_draw_str(canvas, 100, 38, "%");
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canvas_draw_str(canvas, 68, 48, ts_data_buffer_absolute_humidity);
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canvas_draw_str(canvas, 100, 48, "g/m3");
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} break;
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default:
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break;
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}
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}
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// <sumary>
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// Input callback
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// </sumary>
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static void temperature_sensor_input_callback(InputEvent* input_event, void* ctx) {
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furi_assert(ctx);
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FuriMessageQueue* event_queue = ctx;
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TSEvent event = {.type = TSEventTypeInput, .input = *input_event};
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furi_message_queue_put(event_queue, &event, FuriWaitForever);
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}
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// <sumary>
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// Timer callback
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// </sumary>
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static void temperature_sensor_timer_callback(FuriMessageQueue* event_queue) {
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furi_assert(event_queue);
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TSEvent event = {.type = TSEventTypeTick};
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furi_message_queue_put(event_queue, &event, 0);
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}
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// <sumary>
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// App entry point
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// </sumary>
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int32_t temperature_sensor_app(void* p) {
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UNUSED(p);
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furi_hal_power_suppress_charge_enter();
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// Declare our variables and assign variables a default value
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TSEvent tsEvent;
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bool sensorFound = false;
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double celsius, fahrenheit, rel_humidity, abs_humidity = TS_DEFAULT_VALUE;
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// Used for absolute humidity calculation
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double vapour_pressure = 0;
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FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(TSEvent));
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// Register callbacks
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ViewPort* view_port = view_port_alloc();
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view_port_draw_callback_set(view_port, temperature_sensor_draw_callback, NULL);
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view_port_input_callback_set(view_port, temperature_sensor_input_callback, event_queue);
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// Create timer and register its callback
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FuriTimer* timer =
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furi_timer_alloc(temperature_sensor_timer_callback, FuriTimerTypePeriodic, event_queue);
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furi_timer_start(timer, furi_kernel_get_tick_frequency());
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// Register viewport
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Gui* gui = furi_record_open(RECORD_GUI);
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gui_add_view_port(gui, view_port, GuiLayerFullscreen);
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// Used to notify the user by blinking red (error) or blue (fetch successful)
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NotificationApp* notifications = furi_record_open(RECORD_NOTIFICATION);
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while(1) {
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furi_check(furi_message_queue_get(event_queue, &tsEvent, FuriWaitForever) == FuriStatusOk);
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// Handle events
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if(tsEvent.type == TSEventTypeInput) {
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// Exit on back key
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if(tsEvent.input.key ==
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InputKeyBack) // We dont check for type here, we can check the type of keypress like: (event.input.type == InputTypeShort)
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break;
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} else if(tsEvent.type == TSEventTypeTick) {
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// Update sensor data
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// Fetch data and set the sensor current status accordingly
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sensorFound = temperature_sensor_fetch_data(&celsius, &rel_humidity);
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temperature_sensor_current_status = (sensorFound ? TSSPendingUpdate : TSSNoSensor);
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if(sensorFound) {
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// Blink blue
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notification_message(notifications, &sequence_blink_blue_100);
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if(celsius != TS_DEFAULT_VALUE && rel_humidity != TS_DEFAULT_VALUE) {
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// Convert celsius to fahrenheit
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fahrenheit = (celsius * 9 / 5) + 32;
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// Calculate absolute humidity - For more info refer to https://github.com/Mywk/FlipperTemperatureSensor/issues/1
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// Calculate saturation vapour pressure first
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vapour_pressure =
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(double)6.11 *
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pow(10, (double)(((double)7.5 * celsius) / ((double)237.3 + celsius)));
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// Then the vapour pressure in Pa
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vapour_pressure = vapour_pressure * rel_humidity;
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// Calculate absolute humidity
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abs_humidity =
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(double)2.16679 * (double)(vapour_pressure / ((double)273.15 + celsius));
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// Fill our buffers here, not on the canvas draw callback
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snprintf(ts_data_buffer_temperature_c, DATA_BUFFER_SIZE, "%.2f", celsius);
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snprintf(ts_data_buffer_temperature_f, DATA_BUFFER_SIZE, "%.2f", fahrenheit);
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snprintf(
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ts_data_buffer_relative_humidity, DATA_BUFFER_SIZE, "%.2f", rel_humidity);
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snprintf(
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ts_data_buffer_absolute_humidity, DATA_BUFFER_SIZE, "%.2f", abs_humidity);
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}
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} else {
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// Reset our variables to their default values
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celsius = fahrenheit = rel_humidity = abs_humidity = TS_DEFAULT_VALUE;
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// Blink red
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notification_message(notifications, &sequence_blink_red_100);
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}
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}
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uint32_t wait_ticks = furi_ms_to_ticks(!sensorFound ? 100 : 500);
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furi_delay_tick(wait_ticks);
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}
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furi_hal_power_suppress_charge_exit();
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// Dobby is freee (free our variables, Flipper will crash if we don't do this!)
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furi_timer_free(timer);
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gui_remove_view_port(gui, view_port);
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view_port_free(view_port);
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furi_message_queue_free(event_queue);
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furi_record_close(RECORD_NOTIFICATION);
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furi_record_close(RECORD_GUI);
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return 0;
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}
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