lis2dw: add support for bandwidth filtering

2 files changed, 39 insertions, 1 deletions

diff --git a/watch-library/shared/driver/lis2dw.c b/watch-library/shared/driver/lis2dw.c
index b2c93d85..1b1ecf11 100644
--- a/watch-library/shared/driver/lis2dw.c
+++ b/watch-library/shared/driver/lis2dw.c
@@ -115,6 +115,30 @@ lis2dw_data_rate_t lis2dw_get_data_rate(void) {
     return watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL1) >> 4;
 }
 
+void lis2dw_set_filter_type(lis2dw_filter_t bwfilter) {
+    uint8_t val = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6) & ~(LIS2DW_CTRL6_VAL_FDS_HIGH);
+    uint8_t bits = bwfilter << 3;
+    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6, val | bits);
+}
+
+lis2dw_filter_t lis2dw_get_filter_type(void) {
+    uint8_t retval = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6) & (LIS2DW_CTRL6_VAL_FDS_HIGH);
+    retval >>= 3;
+    return (lis2dw_filter_t)retval;
+}
+
+void lis2dw_set_bandwidth_filtering(lis2dw_bandwidth_filtering_mode_t bwfilter) {
+    uint8_t val = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6) & ~(LIS2DW_CTRL6_VAL_BANDWIDTH_DIV20);
+    uint8_t bits = bwfilter << 6;
+    watch_i2c_write8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6, val | bits);
+}
+
+lis2dw_bandwidth_filtering_mode_t lis2dw_get_filtering(void) {
+    uint8_t retval = watch_i2c_read8(LIS2DW_ADDRESS, LIS2DW_REG_CTRL6) & (LIS2DW_CTRL6_VAL_BANDWIDTH_DIV20);
+    retval >>= 6;
+    return (lis2dw_bandwidth_filtering_mode_t)retval;
+}
+
 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;
diff --git a/watch-library/shared/driver/lis2dw.h b/watch-library/shared/driver/lis2dw.h
index 41611172..83b0cfb1 100644
--- a/watch-library/shared/driver/lis2dw.h
+++ b/watch-library/shared/driver/lis2dw.h
@@ -88,6 +88,11 @@ typedef enum {
 } lis2dw_bandwidth_filtering_mode_t;
 
 typedef enum {
+  LIS2DW_FILTER_LOW_PASS = 0,
+  LIS2DW_FILTER_HIGH_PASS = 1,
+} lis2dw_filter_t;
+
+typedef enum {
   LIS2DW_RANGE_16_G = 0b11, // +/- 16g
   LIS2DW_RANGE_8_G = 0b10,  // +/- 8g
   LIS2DW_RANGE_4_G = 0b01,  // +/- 4g
@@ -167,7 +172,8 @@ typedef enum {
 #define LIS2DW_CTRL6_VAL_RANGE_4G         (LIS2DW_RANGE_4_G << 4)
 #define LIS2DW_CTRL6_VAL_RANGE_8G         (LIS2DW_RANGE_8_G << 4)
 #define LIS2DW_CTRL6_VAL_RANGE_16G        (LIS2DW_RANGE_16_G << 4)
-#define LIS2DW_CTRL6_VAL_FDS              0b00001000
+#define LIS2DW_CTRL6_VAL_FDS_LOW          (LIS2DW_FILTER_LOW_PASS << 3)
+#define LIS2DW_CTRL6_VAL_FDS_HIGH         (LIS2DW_FILTER_HIGH_PASS << 3)
 #define LIS2DW_CTRL6_VAL_LOW_NOISE        0b00000100
 
 #define LIS2DW_REG_OUT_TEMP 0x26
@@ -277,6 +283,14 @@ void lis2dw_set_data_rate(lis2dw_data_rate_t dataRate);
 
 lis2dw_data_rate_t lis2dw_get_data_rate(void);
 
+void lis2dw_set_filter_type(lis2dw_filter_t filter);
+
+lis2dw_filter_t lis2dw_get_filter_type(void);
+
+void lis2dw_set_bandwidth_filtering(lis2dw_bandwidth_filtering_mode_t bwfilter);
+
+lis2dw_bandwidth_filtering_mode_t lis2dw_get_filtering(void);
+
 void lis2dw_set_low_power_mode(lis2dw_low_power_mode_t mode);
 
 lis2dw_low_power_mode_t lis2dw_get_low_power_mode(void);