393 lines
14 KiB
C
393 lines
14 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "watch.h"
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#include "bme280.h"
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#include "app.h"
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ApplicationState application_state;
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char buf[16] = {0};
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/**
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* @brief Zeroes out the application state struct.
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*/
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void app_init() {
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memset(&application_state, 0, sizeof(application_state));
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}
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void app_wake_from_deep_sleep() {
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// This app does not support deep sleep mode.
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}
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void app_setup() {
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struct calendar_date_time date_time;
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watch_get_date_time(&date_time);
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if (date_time.date.year < 2020) {
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date_time.date.year = 2020;
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watch_set_date_time(date_time);
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}
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watch_enable_external_interrupts();
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watch_register_interrupt_callback(BTN_MODE, cb_mode_pressed, INTERRUPT_TRIGGER_RISING);
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watch_register_interrupt_callback(BTN_LIGHT, cb_light_pressed, INTERRUPT_TRIGGER_RISING);
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watch_register_extwake_callback(BTN_ALARM, cb_alarm_pressed, true);
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watch_enable_buzzer();
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watch_enable_leds();
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// pin A0 powers the sensor on this board.
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watch_enable_digital_output(A0);
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watch_set_pin_level(A0, true);
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delay_ms(10);
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watch_enable_i2c();
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watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_SOFTRESET, BME280_SOFT_RESET_CODE);
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delay_ms(10);
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application_state.dig_T1 = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T1);
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application_state.dig_T2 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T2);
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application_state.dig_T3 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T3);
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application_state.dig_H1 = watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H1);
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application_state.dig_H2 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_H2);
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application_state.dig_H3 = watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H3);
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application_state.dig_H4 = ((int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H4) << 4) |
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(watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H4 + 1) & 0xF);
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application_state.dig_H5 = ((int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H5 + 1) << 4) |
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(watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H5) >> 4);
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application_state.dig_H6 = (int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H6);
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watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL_HUMID, BME280_CONTROL_HUMID_SAMPLING_NONE);
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watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL, BME280_CONTROL_TEMPERATURE_SAMPLING_X16 |
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BME280_CONTROL_PRESSURE_SAMPLING_NONE |
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BME280_CONTROL_MODE_FORCED);
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watch_enable_display();
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watch_register_tick_callback(cb_tick);
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}
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/**
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* Nothing to do here.
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*/
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void app_prepare_for_sleep() {
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}
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/**
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* @todo restore the BME280's calibration values from backup memory
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*/
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void app_wake_from_sleep() {
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}
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/**
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* Displays the temperature and humidity on screen, or a string indicating no measurements are being taken.
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*/
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bool app_loop() {
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// play a beep if the mode has changed in response to a user's press of the MODE button
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if (application_state.mode_changed) {
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// low note for nonzero case, high note for return to clock
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watch_buzzer_play_note(application_state.mode ? BUZZER_NOTE_C7 : BUZZER_NOTE_C8, 100);
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application_state.mode_changed = false;
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}
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// If the user is not in clock mode and the mode timeout has expired, return them to clock mode
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if (application_state.mode != MODE_CLOCK && application_state.mode_ticks == 0) {
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application_state.mode = MODE_CLOCK;
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application_state.mode_changed = true;
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}
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// If the LED is off and should be on, turn it on
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if (application_state.light_ticks > 0 && !application_state.led_on) {
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watch_set_led_green();
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application_state.led_on = true;
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}
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// if the LED is on and should be off, turn it off
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if (application_state.led_on && application_state.light_ticks == 0) {
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// unless the user is holding down the LIGHT button, in which case, give them more time.
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if (watch_get_pin_level(BTN_LIGHT)) {
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application_state.light_ticks = 3;
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} else {
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watch_set_led_off();
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application_state.led_on = false;
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}
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}
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switch (application_state.mode) {
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case MODE_CLOCK:
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do_clock_mode();
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break;
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case MODE_TEMP:
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do_temp_mode();
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break;
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case MODE_LOG:
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do_log_mode();
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break;
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case MODE_PREFS:
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do_prefs_mode();
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break;
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case MODE_SET:
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do_set_time_mode();
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break;
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case NUM_MODES:
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// dummy case, just silences a warning
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break;
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}
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application_state.mode_changed = false;
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return true;
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}
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/**
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* Reads the temperature from the BME280
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* @param p_t_fine - an optional pointer to an int32_t; if provided, the t_fine measurement
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* (required for humidity calculation) will be returned by reference.
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* Pass in NULL if you do not care about this value.
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* @return a float indicating the temperature in degrees celsius.
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*/
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float read_temperature(int32_t *p_t_fine) {
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// read24 reads the bytes into a uint32 which works for little-endian values (MSB is 0)
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uint32_t raw_data = watch_i2c_read24(BME280_ADDRESS, BME280_REGISTER_TEMP_DATA) >> 8;
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// alas the sensor's register layout is big-endian-ish, with a nibble of zeroes at the end of the LSB.
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// this line shuffles everything back into place (swaps LSB and MSB and shifts the zeroes off the end)
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int32_t adc_value = (((raw_data >> 16) | (raw_data & 0xFF00) | (raw_data << 16)) & 0xFFFFFF) >> 4;
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// this bit is cribbed from Adafruit's BME280 driver. support their open source efforts by buying some stuff!
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int32_t var1 = ((((adc_value >> 3) - ((int32_t)application_state.dig_T1 << 1))) * ((int32_t)application_state.dig_T2)) >> 11;
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int32_t var2 = (((((adc_value >> 4) - ((int32_t)application_state.dig_T1)) * ((adc_value >> 4) - ((int32_t)application_state.dig_T1))) >> 12) * ((int32_t)application_state.dig_T3)) >> 14;
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int32_t t_fine = var1 + var2;
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// if we got a pointer to a t_fine, return it by reference (for humidity calculation).
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if (p_t_fine != NULL) *p_t_fine = t_fine;
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if (application_state.is_fahrenheit) {
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return (((t_fine * 5 + 128) >> 8) / 100.0) * 1.8 + 32;
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} else {
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return ((t_fine * 5 + 128) >> 8) / 100.0;
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}
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}
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/**
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* Reads the humidity from the BME280
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* @param t_fine - the t_fine measurement from a call to read_temperature
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* @return a float indicating the relative humidity as a percentage from 0-100.
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* @todo the returned value is glitchy, need to fix.
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*/
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float read_humidity(int32_t t_fine) {
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int32_t adc_value = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_HUMID_DATA);
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// again, cribbed from Adafruit's BME280 driver. they sell a great breakout board for this sensor!
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int32_t v_x1_u32r = (t_fine - ((int32_t)76800));
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v_x1_u32r = (((((adc_value << 14) - (((int32_t)application_state.dig_H4) << 20) - (((int32_t)application_state.dig_H5) * v_x1_u32r)) +
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((int32_t)16384)) >> 15) * (((((((v_x1_u32r * ((int32_t)application_state.dig_H6)) >> 10) * (((v_x1_u32r * ((int32_t)application_state.dig_H3)) >> 11) +
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((int32_t)32768))) >> 10) + ((int32_t)2097152)) * ((int32_t)application_state.dig_H2) + 8192) >> 14));
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v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((int32_t)application_state.dig_H1)) >> 4));
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v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
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v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
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float h = (v_x1_u32r >> 12);
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return h / 1024.0;
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}
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void log_data() {
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struct calendar_date_time date_time;
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watch_get_date_time(&date_time);
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uint8_t hour = date_time.time.hour;
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int8_t temperature = read_temperature(NULL);
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for(int i = 0; i < MAX_DATA_POINTS - 1; i++) {
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application_state.logged_data[i] = application_state.logged_data[i + 1];
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}
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application_state.logged_data[MAX_DATA_POINTS - 1].is_valid = true;
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application_state.logged_data[MAX_DATA_POINTS - 1].hour = hour;
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application_state.logged_data[MAX_DATA_POINTS - 1].temperature = temperature;
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}
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void do_clock_mode() {
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struct calendar_date_time date_time;
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const char months[12][3] = {"JA", "FE", "MR", "AR", "MA", "JN", "JL", "AU", "SE", "OC", "NO", "dE"};
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watch_get_date_time(&date_time);
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watch_display_string((char *)months[date_time.date.month - 1], 0);
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sprintf(buf, "%2d%2d%02d%02d", date_time.date.day, date_time.time.hour, date_time.time.min, date_time.time.sec);
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watch_display_string(buf, 2);
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watch_set_colon();
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}
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void do_temp_mode() {
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int32_t t_fine;
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float temperature;
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float humidity;
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// take one reading
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watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL, BME280_CONTROL_TEMPERATURE_SAMPLING_X16 |
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BME280_CONTROL_MODE_FORCED);
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// wait for reading to finish
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while(watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_STATUS) & BME280_STATUS_UPDATING_MASK);
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temperature = read_temperature(&t_fine);
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humidity = read_humidity(t_fine);
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if (application_state.show_humidity) {
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sprintf(buf, "TE%2d%4.1f#%c", (int)(humidity / 10), temperature, application_state.is_fahrenheit ? 'F' : 'C');
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} else {
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sprintf(buf, "TE %4.1f#%c", temperature, application_state.is_fahrenheit ? 'F' : 'C');
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}
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watch_display_string(buf, 0);
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watch_clear_colon();
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}
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void do_log_mode() {
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bool is_valid = (uint8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].is_valid);
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uint8_t hour = (uint8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].hour);
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int8_t temperature = (int8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].temperature);
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if (!is_valid) {
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sprintf(buf, "LO%2d------", application_state.page);
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watch_clear_colon();
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} else {
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sprintf(buf, "LO%2d%2d%4d", application_state.page, hour, temperature);
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watch_set_colon();
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}
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watch_display_string(buf, 0);
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}
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void log_mode_handle_primary_button() {
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application_state.page++;
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if (application_state.page == MAX_DATA_POINTS) application_state.page = 0;
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}
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void do_prefs_mode() {
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sprintf(buf, "PR CorF %c", application_state.is_fahrenheit ? 'F' : 'C');
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watch_display_string(buf, 0);
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watch_clear_colon();
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}
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void prefs_mode_handle_primary_button() {
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// TODO: add rest of preferences (12/24, humidity, LED color, etc.)
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// for now only one, C or F
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}
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void prefs_mode_handle_secondary_button() {
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application_state.is_fahrenheit = !application_state.is_fahrenheit;
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}
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void do_set_time_mode() {
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struct calendar_date_time date_time;
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watch_get_date_time(&date_time);
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watch_display_string(" ", 0);
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switch (application_state.page) {
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case 0: // hour
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sprintf(buf, "ST t%2d", date_time.time.hour);
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break;
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case 1: // minute
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sprintf(buf, "ST t %02d", date_time.time.min);
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break;
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case 2: // second
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sprintf(buf, "ST t %02d", date_time.time.sec);
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break;
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case 3: // year
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sprintf(buf, "ST d%2d", date_time.date.year - 2000);
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break;
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case 4: // month
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sprintf(buf, "ST d %02d", date_time.date.month);
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break;
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case 5: // day
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sprintf(buf, "ST d %02d", date_time.date.day);
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break;
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}
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watch_display_string(buf, 0);
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watch_set_pixel(1, 12); // required for T in position 1
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}
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void set_time_mode_handle_primary_button() {
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application_state.page++;
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if (application_state.page == 6) application_state.page = 0;
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}
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void set_time_mode_handle_secondary_button() {
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struct calendar_date_time date_time;
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watch_get_date_time(&date_time);
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const uint8_t days_in_month[12] = {31, 28, 31, 30, 31, 30, 30, 31, 30, 31, 30, 31};
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switch (application_state.page) {
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case 0: // hour
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date_time.time.hour = (date_time.time.hour + 1) % 24;
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break;
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case 1: // minute
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date_time.time.min = (date_time.time.min + 1) % 60;
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break;
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case 2: // second
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date_time.time.sec = 0;
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break;
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case 3: // year
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// only allow 2021-2030. fix this sometime next decade
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date_time.date.year = ((date_time.date.year % 10) + 1) + 2020;
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break;
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case 4: // month
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date_time.date.month = ((date_time.date.month + 1) % 12);
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break;
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case 5: // day
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date_time.date.day = date_time.date.day + 1;
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// can't set to the 29th on a leap year. if it's february 29, set to 11:59 on the 28th.
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// and it should roll over.
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if (date_time.date.day > days_in_month[date_time.date.month - 1]) {
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date_time.date.day = 1;
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}
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break;
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}
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watch_set_date_time(date_time);
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}
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void cb_mode_pressed() {
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application_state.mode = (application_state.mode + 1) % NUM_MODES;
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application_state.mode_changed = true;
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application_state.mode_ticks = 300;
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application_state.page = 0;
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}
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void cb_light_pressed() {
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switch (application_state.mode) {
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case MODE_PREFS:
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prefs_mode_handle_secondary_button();
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break;
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case MODE_SET:
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set_time_mode_handle_secondary_button();
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break;
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default:
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application_state.light_ticks = 3;
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break;
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}
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}
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void cb_alarm_pressed() {
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switch (application_state.mode) {
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case MODE_LOG:
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log_mode_handle_primary_button();
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break;
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case MODE_PREFS:
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prefs_mode_handle_primary_button();
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break;
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case MODE_SET:
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set_time_mode_handle_primary_button();
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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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void cb_tick() {
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// TODO: use alarm interrupt to trigger data acquisition.
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struct calendar_date_time date_time;
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watch_get_date_time(&date_time);
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if (date_time.time.min == 0 && date_time.time.sec == 0) {
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log_data();
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}
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if (application_state.light_ticks > 0) {
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application_state.light_ticks--;
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}
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if (application_state.mode_ticks > 0) {
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application_state.mode_ticks--;
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}
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}
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