new project: sensor watch environment

4 files changed, 421 insertions, 0 deletions

diff --git a/Sensor Watch BME280 Project/app.c b/Sensor Watch BME280 Project/app.c
new file mode 100644
index 00000000..f2605070
--- /dev/null
+++ b/Sensor Watch BME280 Project/app.c
@@ -0,0 +1,184 @@
+#include <stdio.h>
+#include <string.h>
+#include "watch.h"
+#include "app.h"
+#include "bme280.h"
+
+typedef enum ApplicationMode {
+    MODE_TEMPERATURE = 0,
+    MODE_HUMIDITY,
+    MODE_OFF,
+} ApplicationMode;
+
+typedef struct ApplicationState {
+    ApplicationMode mode;
+    bool light_on;
+    uint16_t dig_T1;
+    int16_t dig_T2;
+    int16_t dig_T3;
+    uint8_t dig_H1;
+    int16_t dig_H2;
+    uint8_t dig_H3;
+    int16_t dig_H4;
+    int16_t dig_H5;
+    int8_t dig_H6;
+} ApplicationState;
+
+ApplicationState application_state;
+
+
+void cb_mode_pressed();
+void cb_tick();
+
+float read_temperature(int32_t *p_t_fine);
+float read_humidity(int32_t t_fine);
+
+/**
+ * @brief Zeroes out the application state struct.
+ */
+void app_init() {
+    memset(&application_state, 0, sizeof(application_state));
+}
+
+/**
+ * @todo stash the BME280's calibration values in backup memory so we don't have to ask again
+ */
+void app_wake_from_deep_sleep() {
+}
+
+/**
+ * Enables the MODE button, the display and the sensor, and grabs calibration data.
+ */
+void app_setup() {
+    watch_enable_buttons();
+    watch_register_button_callback(BTN_MODE, cb_mode_pressed);
+
+    // 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_X16);
+    watch_i2c_write8(BME280_ADDRESS, BME280_REGISTER_CONTROL, BME280_CONTROL_TEMPERATURE_SAMPLING_X16 |
+                                                              BME280_CONTROL_PRESSURE_SAMPLING_NONE |
+                                                              BME280_CONTROL_MODE_NORMAL);
+
+    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() {
+    int32_t t_fine;
+    float temperature;
+    float humidity;
+    char buf[11] = {0};
+
+    switch (application_state.mode) {
+        case MODE_TEMPERATURE:
+            temperature = read_temperature(NULL);
+            sprintf(buf, "TE  %4.1f#C", temperature);
+            watch_display_string(buf, 0);
+            watch_clear_pixel(1, 16);
+            break;
+        case MODE_HUMIDITY:
+            temperature = read_temperature(&t_fine);
+            humidity = read_humidity(t_fine);
+            sprintf(buf, "HU  rH %3d", (int)humidity);
+            watch_display_string(buf, 0);
+            watch_set_pixel(1, 16);
+            break;
+        case MODE_OFF:
+            watch_display_string("    Sleep ", 0);
+            watch_clear_pixel(1, 16);
+    }
+
+    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;
+
+    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 temperature in degrees celsius.
+ */
+float read_humidity(int32_t t_fine) {
+    int32_t adc_value = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_HUMID_DATA);
+    // the sensor returns this as big-endian, so swap the bytes.
+    adc_value = (adc_value >> 8) | (adc_value << 8);
+
+    // again, cribbed from Adafruit's BME280 driver. they sell a great breakout board for this sensor!
+    int32_t v_x1_u32r = 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 cb_mode_pressed() {
+    application_state.mode = (application_state.mode + 1) % 3;
+}
+
+void cb_tick() {
+}
+
diff --git a/Sensor Watch BME280 Project/bme280.h b/Sensor Watch BME280 Project/bme280.h
new file mode 100644
index 00000000..ba142582
--- /dev/null
+++ b/Sensor Watch BME280 Project/bme280.h
@@ -0,0 +1,85 @@
+#define BME280_ADDRESS (0x77)
+#define BME280_SOFT_RESET_CODE (0xB6)
+#define BME280_STATUS_UPDATING_MASK (1 << 3)
+
+typedef enum BME280Register {
+    BME280_REGISTER_DIG_T1 = 0x88,
+    BME280_REGISTER_DIG_T2 = 0x8A,
+    BME280_REGISTER_DIG_T3 = 0x8C,
+
+    BME280_REGISTER_DIG_P1 = 0x8E,
+    BME280_REGISTER_DIG_P2 = 0x90,
+    BME280_REGISTER_DIG_P3 = 0x92,
+    BME280_REGISTER_DIG_P4 = 0x94,
+    BME280_REGISTER_DIG_P5 = 0x96,
+    BME280_REGISTER_DIG_P6 = 0x98,
+    BME280_REGISTER_DIG_P7 = 0x9A,
+    BME280_REGISTER_DIG_P8 = 0x9C,
+    BME280_REGISTER_DIG_P9 = 0x9E,
+
+    BME280_REGISTER_DIG_H1 = 0xA1,
+    BME280_REGISTER_DIG_H2 = 0xE1,
+    BME280_REGISTER_DIG_H3 = 0xE3,
+    BME280_REGISTER_DIG_H4 = 0xE4,
+    BME280_REGISTER_DIG_H5 = 0xE5,
+    BME280_REGISTER_DIG_H6 = 0xE7,
+
+    BME280_REGISTER_CHIPID = 0xD0,
+    BME280_REGISTER_VERSION = 0xD1,
+    BME280_REGISTER_SOFTRESET = 0xE0,
+
+    BME280_REGISTER_CAL26 = 0xE1,
+
+    BME280_REGISTER_CONTROL_HUMID = 0xF2,
+    BME280_REGISTER_STATUS = 0XF3,
+    BME280_REGISTER_CONTROL = 0xF4,
+    BME280_REGISTER_CONFIG = 0xF5,
+    BME280_REGISTER_PRESSURE_DATA = 0xF7,
+    BME280_REGISTER_TEMP_DATA = 0xFA,
+    BME280_REGISTER_HUMID_DATA = 0xFD
+} BME280Register;
+
+typedef enum BME280Control {
+    BME280_CONTROL_MODE_SLEEP = 0b00,
+    BME280_CONTROL_MODE_FORCED = 0b01,
+    BME280_CONTROL_MODE_NORMAL = 0b11,
+    BME280_CONTROL_PRESSURE_SAMPLING_NONE = 0b000 << 2,
+    BME280_CONTROL_PRESSURE_SAMPLING_X1 = 0b001 << 2,
+    BME280_CONTROL_PRESSURE_SAMPLING_X2 = 0b010 << 2,
+    BME280_CONTROL_PRESSURE_SAMPLING_X4 = 0b011 << 2,
+    BME280_CONTROL_PRESSURE_SAMPLING_X8 = 0b100 << 2,
+    BME280_CONTROL_PRESSURE_SAMPLING_X16 = 0b101 << 2,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_NONE = 0b000 << 5,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_X1 = 0b001 << 5,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_X2 = 0b010 << 5,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_X4 = 0b011 << 5,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_X8 = 0b100 << 5,
+    BME280_CONTROL_TEMPERATURE_SAMPLING_X16 = 0b101 << 5
+} BME280Control;
+
+typedef enum BME280ControlHumidity {
+    BME280_CONTROL_HUMID_SAMPLING_NONE = 0b000,
+    BME280_CONTROL_HUMID_SAMPLING_X1 = 0b001,
+    BME280_CONTROL_HUMID_SAMPLING_X2 = 0b010,
+    BME280_CONTROL_HUMID_SAMPLING_X4 = 0b011,
+    BME280_CONTROL_HUMID_SAMPLING_X8 = 0b100,
+    BME280_CONTROL_HUMID_SAMPLING_X16 = 0b101
+} BME280ControlHumidity;
+
+typedef enum BME280Filter {
+    BME280_CONFIG_FILTER_OFF = 0b000 << 2,
+    BME280_CONFIG_FILTER_X2 = 0b001 << 2,
+    BME280_CONFIG_FILTER_X4 = 0b010 << 2,
+    BME280_CONFIG_FILTER_X8 = 0b011 << 2,
+    BME280_CONFIG_FILTER_X16 = 0b10 << 2,
+    BME280_CONFIG_STANDBY_MS_0_5 = 0b000 << 5,
+    BME280_CONFIG_STANDBY_MS_10 = 0b110 << 5,
+    BME280_CONFIG_STANDBY_MS_20 = 0b111 << 5,
+    BME280_CONFIG_STANDBY_MS_62_5 = 0b001 << 5,
+    BME280_CONFIG_STANDBY_MS_125 = 0b010 << 5,
+    BME280_CONFIG_STANDBY_MS_250 = 0b011 << 5,
+    BME280_CONFIG_STANDBY_MS_500 = 0b100 << 5,
+    BME280_CONFIG_STANDBY_MS_1000 = 0b101 << 5
+} BME280Filter;
+
+inline uint16_t make_le_16(uint16_t val) { return (val >> 8) | (val << 8); }
diff --git a/Sensor Watch BME280 Project/make/.gitignore b/Sensor Watch BME280 Project/make/.gitignore
new file mode 100755
index 00000000..3722ac63
--- /dev/null
+++ b/Sensor Watch BME280 Project/make/.gitignore
@@ -0,0 +1 @@
+build/

diff --git a/Sensor Watch BME280 Project/make/Makefile b/Sensor Watch BME280 Project/make/Makefile
new file mode 100755
index 00000000..9b8d25c0
--- /dev/null
+++ b/Sensor Watch BME280 Project/make/Makefile
@@ -0,0 +1,151 @@
+##############################################################################
+BUILD = build
+BIN = watch
+
+##############################################################################
+.PHONY: all directory clean size
+
+CC = arm-none-eabi-gcc
+OBJCOPY = arm-none-eabi-objcopy
+SIZE = arm-none-eabi-size
+UF2 = python ../../utils/uf2conv.py
+
+ifeq ($(OS), Windows_NT)
+  MKDIR = gmkdir
+else
+  MKDIR = mkdir
+endif
+
+CFLAGS += -W -Wall --std=gnu99 -Os
+CFLAGS += -fno-diagnostics-show-caret
+CFLAGS += -fdata-sections -ffunction-sections
+CFLAGS += -funsigned-char -funsigned-bitfields
+CFLAGS += -mcpu=cortex-m0plus -mthumb
+CFLAGS += -MD -MP -MT $(BUILD)/$(*F).o -MF $(BUILD)/$(@F).d
+
+LDFLAGS += -mcpu=cortex-m0plus -mthumb
+LDFLAGS += -Wl,--gc-sections
+LDFLAGS += -Wl,--script=../../watch-library/linker/saml22j18.ld
+
+# If you add any additional directories with headers, add them to this list, e.g.
+# ../drivers/
+INCLUDES += \
+  -I../ \
+  -I../../watch-library/include \
+  -I../../watch-library/hal/ \
+  -I../../watch-library/hal/documentation/ \
+  -I../../watch-library/hal/include/ \
+  -I../../watch-library/hal/src/ \
+  -I../../watch-library/hal/utils/ \
+  -I../../watch-library/hal/utils/include/ \
+  -I../../watch-library/hal/utils/src/ \
+  -I../../watch-library/hpl/ \
+  -I../../watch-library/hpl/adc/ \
+  -I../../watch-library/hpl/core/ \
+  -I../../watch-library/hpl/dmac/ \
+  -I../../watch-library/hpl/eic/ \
+  -I../../watch-library/hpl/gclk/ \
+  -I../../watch-library/hpl/mclk/ \
+  -I../../watch-library/hpl/osc32kctrl/ \
+  -I../../watch-library/hpl/oscctrl/ \
+  -I../../watch-library/hpl/pm/ \
+  -I../../watch-library/hpl/port/ \
+  -I../../watch-library/hpl/rtc/ \
+  -I../../watch-library/hpl/sercom/ \
+  -I../../watch-library/hpl/slcd/ \
+  -I../../watch-library/hpl/systick/ \
+  -I../../watch-library/hpl/tcc/ \
+  -I../../watch-library/hpl/tc/ \
+  -I../../watch-library/hri/ \
+  -I../../watch-library/config/ \
+  -I../../watch-library/hw/ \
+  -I../../watch-library/watch/ \
+  -I../../watch-library
+
+# If you add any additional C files to your project, add them each to this list, e.g.
+# ../drivers/st25dv.c
+SRCS += \
+  ../app.c \
+  ../../watch-library/main.c \
+  ../../watch-library/startup_saml22.c \
+  ../../watch-library/hw/driver_init.c \
+  ../../watch-library/watch/watch.c \
+  ../../watch-library/hal/src/hal_adc_sync.c \
+  ../../watch-library/hal/src/hal_atomic.c \
+  ../../watch-library/hal/src/hal_calendar.c \
+  ../../watch-library/hal/src/hal_delay.c \
+  ../../watch-library/hal/src/hal_ext_irq.c \
+  ../../watch-library/hal/src/hal_gpio.c \
+  ../../watch-library/hal/src/hal_i2c_m_sync.c \
+  ../../watch-library/hal/src/hal_init.c \
+  ../../watch-library/hal/src/hal_io.c \
+  ../../watch-library/hal/src/hal_pwm.c \
+  ../../watch-library/hal/src/hal_slcd_sync.c \
+  ../../watch-library/hal/src/hal_sleep.c \
+  ../../watch-library/hal/utils/src/utils_assert.c \
+  ../../watch-library/hal/utils/src/utils_event.c \
+  ../../watch-library/hal/utils/src/utils_list.c \
+  ../../watch-library/hal/utils/src/utils_syscalls.c \
+  ../../watch-library/hpl/adc/hpl_adc.c \
+  ../../watch-library/hpl/core/hpl_core_m0plus_base.c \
+  ../../watch-library/hpl/core/hpl_init.c \
+  ../../watch-library/hpl/dmac/hpl_dmac.c \
+  ../../watch-library/hpl/eic/hpl_eic.c \
+  ../../watch-library/hpl/gclk/hpl_gclk.c \
+  ../../watch-library/hpl/mclk/hpl_mclk.c \
+  ../../watch-library/hpl/osc32kctrl/hpl_osc32kctrl.c \
+  ../../watch-library/hpl/oscctrl/hpl_oscctrl.c \
+  ../../watch-library/hpl/pm/hpl_pm.c \
+  ../../watch-library/hpl/rtc/hpl_rtc.c \
+  ../../watch-library/hpl/sercom/hpl_sercom.c \
+  ../../watch-library/hpl/slcd/hpl_slcd.c \
+  ../../watch-library/hpl/systick/hpl_systick.c \
+  ../../watch-library/hpl/tcc/hpl_tcc.c \
+  ../../watch-library/hpl/tc/hpl_tc.c
+
+DEFINES += \
+  -D__SAML22J18A__ \
+  -DDONT_USE_CMSIS_INIT
+
+CFLAGS += $(INCLUDES) $(DEFINES)
+
+OBJS = $(addprefix $(BUILD)/, $(notdir %/$(subst .c,.o, $(SRCS))))
+
+all: directory $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
+
+$(BUILD)/$(BIN).elf: $(OBJS)
+	@echo LD $@
+	@$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
+
+$(BUILD)/$(BIN).hex: $(BUILD)/$(BIN).elf
+	@echo OBJCOPY $@
+	@$(OBJCOPY) -O ihex $^ $@
+
+$(BUILD)/$(BIN).bin: $(BUILD)/$(BIN).elf
+	@echo OBJCOPY $@
+	@$(OBJCOPY) -O binary $^ $@
+
+$(BUILD)/$(BIN).uf2: $(BUILD)/$(BIN).bin
+	@echo UF2CONV $@
+	@$(UF2) $^ -co $@
+
+install:
+	@$(UF2) -D $(BUILD)/$(BIN).uf2
+
+%.o:
+	@echo CC $@
+	@$(CC) $(CFLAGS) $(filter %/$(subst .o,.c,$(notdir $@)), $(SRCS)) -c -o $@
+
+directory:
+	@$(MKDIR) -p $(BUILD)
+
+size: $(BUILD)/$(BIN).elf
+	@echo size:
+	@$(SIZE) -t $^
+
+clean:
+	@echo clean
+	@-rm -rf $(BUILD)
+
+-include $(wildcard $(BUILD)/*.d)
+