start in low power mode

diff --git a/watch-library/driver/lis2dw.c b/watch-library/driver/lis2dw.c
index 73b54aafcd1abe0fd5bef24c38073d1b6148d1e3..f9cd5cc1d28cdc3f47cc8249b12bb8a903f57bef 100644 (file)
--- a/watch-library/driver/lis2dw.c
+++ b/watch-library/driver/lis2dw.c
@@ -31,8 +31,8 @@ bool lis2dw_begin(void) {
     }
     watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL2, LIS2DW_CTRL2_VAL_BOOT);
     watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL2, LIS2DW_CTRL2_VAL_SOFT_RESET);
-    // Start at 100 Hz data rate
-    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1, LIS2DW_CTRL1_VAL_ODR_100HZ | LIS2DW_CTRL1_VAL_MODE_HIGH_PERFORMANCE);
+    // Start at lowest possible data rate and lowest possible power mode
+    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1, LIS2DW_CTRL1_VAL_ODR_LOWEST | LIS2DW_CTRL1_VAL_MODE_LOW_POWER | LIS2DW_CTRL1_VAL_LPMODE_4);
     // Enable block data update (output registers not updated until MSB and LSB have been read) and address autoincrement
     watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL2, LIS2DW_CTRL2_VAL_BDU | LIS2DW_CTRL2_VAL_IF_ADD_INC);
     // Set range to ±2G
@@ -65,10 +65,6 @@ lis2dw_reading lis2dw_get_raw_reading(void) {
     retval.z = buffer[4];
     retval.z |= ((uint16_t)buffer[5]) << 8;
 
-    retval.x >>= 2;
-    retval.y >>= 2;
-    retval.z >>= 2;
-
     return retval;
 }