add LIS2DH accelerometer driver, test app

apps/Sensor Watch Accelerometer Test/app.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+#include "watch.h"
+#include "lis2dh.h"
+
+// This application displays data from the old Sensor Watch Motion sensor board.
+// Note that this board required A0 to be set high to power the sensor.
+// Future accelerometer boards will be powered directly from VCC.
+// Also note that this board has its INT1 pin wired to A1, which is not an external
+// wake pin. Future accelerometer boards will wire interrupt pins to A2 and A4.
+
+uint8_t axis = 0;
+
+void cb_light_pressed() {
+    axis = 1;
+}
+
+void cb_mode_pressed() {
+    axis = 2;
+}
+
+void cb_alarm_pressed() {
+    axis = 3;
+}
+
+void app_init() {
+    gpio_set_pin_direction(A0, GPIO_DIRECTION_OUT);
+    gpio_set_pin_function(A0, GPIO_PIN_FUNCTION_OFF);
+    gpio_set_pin_level(A0, true);
+
+    watch_enable_display();
+
+    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_interrupt_callback(BTN_ALARM, cb_alarm_pressed, INTERRUPT_TRIGGER_RISING);
+
+    watch_enable_i2c();
+
+    lis2dh_begin();
+
+    lis2dh_set_range(LIS2DH_RANGE_2_G);
+    lis2dh_set_data_rate(LIS2DH_DATA_RATE_10_HZ);
+}
+
+void app_wake_from_backup() {
+}
+
+void app_setup() {
+}
+
+void app_prepare_for_standby() {
+}
+
+void app_wake_from_standby() {
+}
+
+bool app_loop() {
+    if (lis2dh_have_new_data()) {
+        lis2dh_reading reading;
+        lis2dh_acceleration_measurement measurement = lis2dh_get_acceleration_measurement(&reading);
+
+        // printf("%d,%d,%d\n", reading.x, reading.y, reading.z);
+        printf("%f,%f,%f\n", measurement.x, measurement.y, measurement.z);
+
+        char buf[11] = {0};
+        switch (axis) {
+            case 1:
+                sprintf(buf, "AC X%-6d", reading.x);
+                break;
+            case 2:
+                sprintf(buf, "AC Y%-6d", reading.y);
+                break;
+            case 3:
+                sprintf(buf, "AC Z%-6d", reading.z);
+                break;
+            default:
+                sprintf(buf, "    %2d%2d%2d", abs(reading.x >> 9), abs(reading.y >> 9), abs(reading.z >> 9));
+                if (reading.x < 0) buf[0] = '_';
+                if (reading.y < 0) buf[1] = '_';
+                if (reading.z < 0) buf[3] = '_';
+                break;
+        }
+
+        watch_display_string(buf, 0);
+    }
+
+    return false;
+}

apps/Sensor Watch Accelerometer Test/make/.gitignore

@@ -0,0 +1 @@
+build/

apps/Sensor Watch Accelerometer Test/make/Makefile

@@ -0,0 +1,10 @@
+TOP = ../../..
+include $(TOP)/make.mk
+
+INCLUDES += \
+  -I../
+
+SRCS += \
+  ../app.c
+
+include $(TOP)/rules.mk