From 68e792f9b71a46474b33d4dc6199522ff70f85d4 Mon Sep 17 00:00:00 2001
From: Joey Castillo <joeycastillo@utexas.edu>
Date: Sun, 9 Jan 2022 12:25:56 -0500
Subject: lis2dw: add low power / low noise mode

---
 watch-library/driver/lis2dw.c | 22 ++++++++++++++++++++++
 watch-library/driver/lis2dw.h |  8 ++++++++
 2 files changed, 30 insertions(+)

(limited to 'watch-library')

diff --git a/watch-library/driver/lis2dw.c b/watch-library/driver/lis2dw.c
index 4e506a6d..6e1ac56d 100644
--- a/watch-library/driver/lis2dw.c
+++ b/watch-library/driver/lis2dw.c
@@ -115,3 +115,25 @@ void lis2dw_set_data_rate(lis2dw_data_rate_t dataRate) {
 lis2dw_data_rate_t lis2dw_get_data_rate(void) {
     return watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) >> 4;
 }
+
+void lis2dw_set_low_power_mode(lis2dw_low_power_mode_t mode) {
+    uint8_t val = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) & ~(0b11);
+    uint8_t bits = mode & 0b11;
+
+    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1, val | bits);
+}
+
+lis2dw_low_power_mode_t lis2dw_get_low_power_mode(void) {
+    return watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) & 0b11;
+}
+
+void lis2dw_set_low_noise_mode(bool on) {
+    uint8_t val = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) & ~(LIS2DW_CTRL6_VAL_LOW_NOISE);
+    uint8_t bits = on ? LIS2DW_CTRL6_VAL_LOW_NOISE : 0;
+
+    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1, val | bits);
+}
+
+bool lis2dw_get_low_noise_mode(void) {
+    return (watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) & LIS2DW_CTRL6_VAL_LOW_NOISE) != 0;
+}
diff --git a/watch-library/driver/lis2dw.h b/watch-library/driver/lis2dw.h
index 7a0e0cbb..22b4484f 100644
--- a/watch-library/driver/lis2dw.h
+++ b/watch-library/driver/lis2dw.h
@@ -254,4 +254,12 @@ void lis2dw_set_data_rate(lis2dw_data_rate_t dataRate);
 
 lis2dw_data_rate_t lis2dw_get_data_rate(void);
 
+void lis2dw_set_low_power_mode(lis2dw_low_power_mode_t mode);
+
+lis2dw_low_power_mode_t lis2dw_get_low_power_mode(void);
+
+void lis2dw_set_low_noise_mode(bool on);
+
+bool lis2dw_get_low_noise_mode(void);
+
 #endif // LIS2DW_H
-- 
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