From 07420e6ead840973d7136222b8e872261a7b18b8 Mon Sep 17 00:00:00 2001 From: Joey Castillo Date: Thu, 16 Sep 2021 15:40:01 -0400 Subject: move apps to subdirectory, add relative path support to Makefile --- apps/Sensor Watch BME280 Project/app.c | 392 +++++++++++++++++++++++++++++++++ 1 file changed, 392 insertions(+) create mode 100644 apps/Sensor Watch BME280 Project/app.c (limited to 'apps/Sensor Watch BME280 Project/app.c') diff --git a/apps/Sensor Watch BME280 Project/app.c b/apps/Sensor Watch BME280 Project/app.c new file mode 100644 index 00000000..e07b35f8 --- /dev/null +++ b/apps/Sensor Watch BME280 Project/app.c @@ -0,0 +1,392 @@ +#include +#include +#include +#include "watch.h" +#include "bme280.h" + +#include "app.h" + +ApplicationState application_state; +char buf[16] = {0}; + +/** + * @brief Zeroes out the application state struct. + */ +void app_init() { + memset(&application_state, 0, sizeof(application_state)); +} + +void app_wake_from_deep_sleep() { + // This app does not support deep sleep mode. +} + +void app_setup() { + struct calendar_date_time date_time; + watch_get_date_time(&date_time); + if (date_time.date.year < 2020) { + date_time.date.year = 2020; + watch_set_date_time(date_time); + } + + watch_enable_external_interrupts(); + watch_register_interrupt_callback(BTN_MODE, cb_mode_pressed, INTERRUPT_TRIGGER_RISING); + watch_register_interrupt_callback(BTN_LIGHT, cb_light_pressed, INTERRUPT_TRIGGER_RISING); + watch_register_extwake_callback(BTN_ALARM, cb_alarm_pressed, true); + + watch_enable_buzzer(); + watch_enable_leds(); + + // pin A0 powers the sensor on this board. + watch_enable_digital_output(A0); + watch_set_pin_level(A0, true); + delay_ms(10); + + watch_enable_i2c(); + + watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_SOFTRESET, BME280_SOFT_RESET_CODE); + delay_ms(10); + application_state.dig_T1 = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T1); + application_state.dig_T2 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T2); + application_state.dig_T3 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_T3); + application_state.dig_H1 = watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H1); + application_state.dig_H2 = (int16_t)watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_DIG_H2); + application_state.dig_H3 = watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H3); + application_state.dig_H4 = ((int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H4) << 4) | + (watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H4 + 1) & 0xF); + application_state.dig_H5 = ((int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H5 + 1) << 4) | + (watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H5) >> 4); + application_state.dig_H6 = (int8_t)watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_DIG_H6); + + watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL_HUMID, BME280_CONTROL_HUMID_SAMPLING_NONE); + watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL, BME280_CONTROL_TEMPERATURE_SAMPLING_X16 | + BME280_CONTROL_PRESSURE_SAMPLING_NONE | + BME280_CONTROL_MODE_FORCED); + + watch_enable_display(); + + watch_register_tick_callback(cb_tick); +} + +/** + * Nothing to do here. + */ +void app_prepare_for_sleep() { +} + +/** + * @todo restore the BME280's calibration values from backup memory + */ +void app_wake_from_sleep() { +} + +/** + * Displays the temperature and humidity on screen, or a string indicating no measurements are being taken. + */ +bool app_loop() { + // play a beep if the mode has changed in response to a user's press of the MODE button + if (application_state.mode_changed) { + // low note for nonzero case, high note for return to clock + watch_buzzer_play_note(application_state.mode ? BUZZER_NOTE_C7 : BUZZER_NOTE_C8, 100); + application_state.mode_changed = false; + } + + // If the user is not in clock mode and the mode timeout has expired, return them to clock mode + if (application_state.mode != MODE_CLOCK && application_state.mode_ticks == 0) { + application_state.mode = MODE_CLOCK; + application_state.mode_changed = true; + } + + // If the LED is off and should be on, turn it on + if (application_state.light_ticks > 0 && !application_state.led_on) { + watch_set_led_green(); + application_state.led_on = true; + } + + // if the LED is on and should be off, turn it off + if (application_state.led_on && application_state.light_ticks == 0) { + // unless the user is holding down the LIGHT button, in which case, give them more time. + if (watch_get_pin_level(BTN_LIGHT)) { + application_state.light_ticks = 3; + } else { + watch_set_led_off(); + application_state.led_on = false; + } + } + + switch (application_state.mode) { + case MODE_CLOCK: + do_clock_mode(); + break; + case MODE_TEMP: + do_temp_mode(); + break; + case MODE_LOG: + do_log_mode(); + break; + case MODE_PREFS: + do_prefs_mode(); + break; + case MODE_SET: + do_set_time_mode(); + break; + case NUM_MODES: + // dummy case, just silences a warning + break; + } + + application_state.mode_changed = false; + + return true; +} + +/** + * Reads the temperature from the BME280 + * @param p_t_fine - an optional pointer to an int32_t; if provided, the t_fine measurement + * (required for humidity calculation) will be returned by reference. + * Pass in NULL if you do not care about this value. + * @return a float indicating the temperature in degrees celsius. + */ +float read_temperature(int32_t *p_t_fine) { + // read24 reads the bytes into a uint32 which works for little-endian values (MSB is 0) + uint32_t raw_data = watch_i2c_read24(BME280_ADDRESS, BME280_REGISTER_TEMP_DATA) >> 8; + // alas the sensor's register layout is big-endian-ish, with a nibble of zeroes at the end of the LSB. + // this line shuffles everything back into place (swaps LSB and MSB and shifts the zeroes off the end) + int32_t adc_value = (((raw_data >> 16) | (raw_data & 0xFF00) | (raw_data << 16)) & 0xFFFFFF) >> 4; + + // this bit is cribbed from Adafruit's BME280 driver. support their open source efforts by buying some stuff! + int32_t var1 = ((((adc_value >> 3) - ((int32_t)application_state.dig_T1 << 1))) * ((int32_t)application_state.dig_T2)) >> 11; + 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; + int32_t t_fine = var1 + var2; + + // if we got a pointer to a t_fine, return it by reference (for humidity calculation). + if (p_t_fine != NULL) *p_t_fine = t_fine; + + if (application_state.is_fahrenheit) { + return (((t_fine * 5 + 128) >> 8) / 100.0) * 1.8 + 32; + } else { + return ((t_fine * 5 + 128) >> 8) / 100.0; + } +} + +/** + * Reads the humidity from the BME280 + * @param t_fine - the t_fine measurement from a call to read_temperature + * @return a float indicating the relative humidity as a percentage from 0-100. + * @todo the returned value is glitchy, need to fix. + */ +float read_humidity(int32_t t_fine) { + int32_t adc_value = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_HUMID_DATA); + + // again, cribbed from Adafruit's BME280 driver. they sell a great breakout board for this sensor! + int32_t v_x1_u32r = (t_fine - ((int32_t)76800)); + v_x1_u32r = (((((adc_value << 14) - (((int32_t)application_state.dig_H4) << 20) - (((int32_t)application_state.dig_H5) * v_x1_u32r)) + + ((int32_t)16384)) >> 15) * (((((((v_x1_u32r * ((int32_t)application_state.dig_H6)) >> 10) * (((v_x1_u32r * ((int32_t)application_state.dig_H3)) >> 11) + + ((int32_t)32768))) >> 10) + ((int32_t)2097152)) * ((int32_t)application_state.dig_H2) + 8192) >> 14)); + v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((int32_t)application_state.dig_H1)) >> 4)); + v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r; + v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r; + float h = (v_x1_u32r >> 12); + + return h / 1024.0; +} + +void log_data() { + struct calendar_date_time date_time; + watch_get_date_time(&date_time); + uint8_t hour = date_time.time.hour; + int8_t temperature = read_temperature(NULL); + + for(int i = 0; i < MAX_DATA_POINTS - 1; i++) { + application_state.logged_data[i] = application_state.logged_data[i + 1]; + } + application_state.logged_data[MAX_DATA_POINTS - 1].is_valid = true; + application_state.logged_data[MAX_DATA_POINTS - 1].hour = hour; + application_state.logged_data[MAX_DATA_POINTS - 1].temperature = temperature; +} + +void do_clock_mode() { + struct calendar_date_time date_time; + const char months[12][3] = {"JA", "FE", "MR", "AR", "MA", "JN", "JL", "AU", "SE", "OC", "NO", "dE"}; + + watch_get_date_time(&date_time); + watch_display_string((char *)months[date_time.date.month - 1], 0); + sprintf(buf, "%2d%2d%02d%02d", date_time.date.day, date_time.time.hour, date_time.time.min, date_time.time.sec); + watch_display_string(buf, 2); + watch_set_colon(); +} + +void do_temp_mode() { + int32_t t_fine; + float temperature; + float humidity; + + // take one reading + watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL, BME280_CONTROL_TEMPERATURE_SAMPLING_X16 | + BME280_CONTROL_MODE_FORCED); + // wait for reading to finish + while(watch_i2c_read8(BME280_ADDRESS, BME280_REGISTER_STATUS) & BME280_STATUS_UPDATING_MASK); + temperature = read_temperature(&t_fine); + humidity = read_humidity(t_fine); + if (application_state.show_humidity) { + sprintf(buf, "TE%2d%4.1f#%c", (int)(humidity / 10), temperature, application_state.is_fahrenheit ? 'F' : 'C'); + } else { + sprintf(buf, "TE %4.1f#%c", temperature, application_state.is_fahrenheit ? 'F' : 'C'); + } + watch_display_string(buf, 0); + watch_clear_colon(); +} + +void do_log_mode() { + bool is_valid = (uint8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].is_valid); + uint8_t hour = (uint8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].hour); + int8_t temperature = (int8_t)(application_state.logged_data[MAX_DATA_POINTS - 1 - application_state.page].temperature); + if (!is_valid) { + sprintf(buf, "LO%2d------", application_state.page); + watch_clear_colon(); + } else { + sprintf(buf, "LO%2d%2d%4d", application_state.page, hour, temperature); + watch_set_colon(); + } + watch_display_string(buf, 0); +} + +void log_mode_handle_primary_button() { + application_state.page++; + if (application_state.page == MAX_DATA_POINTS) application_state.page = 0; +} + +void do_prefs_mode() { + sprintf(buf, "PR CorF %c", application_state.is_fahrenheit ? 'F' : 'C'); + watch_display_string(buf, 0); + watch_clear_colon(); +} + +void prefs_mode_handle_primary_button() { + // TODO: add rest of preferences (12/24, humidity, LED color, etc.) + // for now only one, C or F +} + +void prefs_mode_handle_secondary_button() { + application_state.is_fahrenheit = !application_state.is_fahrenheit; +} + +void do_set_time_mode() { + struct calendar_date_time date_time; + + watch_get_date_time(&date_time); + watch_display_string(" ", 0); + switch (application_state.page) { + case 0: // hour + sprintf(buf, "ST t%2d", date_time.time.hour); + break; + case 1: // minute + sprintf(buf, "ST t %02d", date_time.time.min); + break; + case 2: // second + sprintf(buf, "ST t %02d", date_time.time.sec); + break; + case 3: // year + sprintf(buf, "ST d%2d", date_time.date.year - 2000); + break; + case 4: // month + sprintf(buf, "ST d %02d", date_time.date.month); + break; + case 5: // day + sprintf(buf, "ST d %02d", date_time.date.day); + break; + } + watch_display_string(buf, 0); + watch_set_pixel(1, 12); // required for T in position 1 +} + +void set_time_mode_handle_primary_button() { + application_state.page++; + if (application_state.page == 6) application_state.page = 0; +} + +void set_time_mode_handle_secondary_button() { + struct calendar_date_time date_time; + watch_get_date_time(&date_time); + const uint8_t days_in_month[12] = {31, 28, 31, 30, 31, 30, 30, 31, 30, 31, 30, 31}; + + switch (application_state.page) { + case 0: // hour + date_time.time.hour = (date_time.time.hour + 1) % 24; + break; + case 1: // minute + date_time.time.min = (date_time.time.min + 1) % 60; + break; + case 2: // second + date_time.time.sec = 0; + break; + case 3: // year + // only allow 2021-2030. fix this sometime next decade + date_time.date.year = ((date_time.date.year % 10) + 1) + 2020; + break; + case 4: // month + date_time.date.month = ((date_time.date.month + 1) % 12); + break; + case 5: // day + date_time.date.day = date_time.date.day + 1; + // can't set to the 29th on a leap year. if it's february 29, set to 11:59 on the 28th. + // and it should roll over. + if (date_time.date.day > days_in_month[date_time.date.month - 1]) { + date_time.date.day = 1; + } + break; + } + watch_set_date_time(date_time); +} + +void cb_mode_pressed() { + application_state.mode = (application_state.mode + 1) % NUM_MODES; + application_state.mode_changed = true; + application_state.mode_ticks = 300; + application_state.page = 0; +} + +void cb_light_pressed() { + switch (application_state.mode) { + case MODE_PREFS: + prefs_mode_handle_secondary_button(); + break; + case MODE_SET: + set_time_mode_handle_secondary_button(); + break; + default: + application_state.light_ticks = 3; + break; + } +} + +void cb_alarm_pressed() { + switch (application_state.mode) { + case MODE_LOG: + log_mode_handle_primary_button(); + break; + case MODE_PREFS: + prefs_mode_handle_primary_button(); + break; + case MODE_SET: + set_time_mode_handle_primary_button(); + break; + default: + break; + } +} + +void cb_tick() { + // TODO: use alarm interrupt to trigger data acquisition. + struct calendar_date_time date_time; + watch_get_date_time(&date_time); + if (date_time.time.min == 0 && date_time.time.sec == 0) { + log_data(); + } + + if (application_state.light_ticks > 0) { + application_state.light_ticks--; + } + if (application_state.mode_ticks > 0) { + application_state.mode_ticks--; + } +} -- cgit v1.2.3