add sensor range en/decoding functions

2 files changed, 40 insertions, 1 deletions

diff --git a/shared/util.c b/shared/util.c
index ea972b0..648631a 100644
--- a/shared/util.c
+++ b/shared/util.c
@@ -4,4 +4,28 @@ unsigned int ws_log16(unsigned int x) {
     unsigned int l = 0;
     while (x >>= 4) ++l; // bitshift right by 4 until x == 0
     return l;
-}
\ No newline at end of file
+}
+
+uint8_t ws_sensor_tmp_to_8(uint16_t temperature) {
+	return temperature / 256;
+}
+
+uint8_t ws_sensor_hum_to_8(uint16_t humidity) {
+	return humidity / 256;
+}
+
+uint8_t ws_sensor_atm_to_8(uint16_t atmospheric_pressure) {
+	return atmospheric_pressure / 256;
+}
+
+float ws_sensor_tmp_to_f(uint8_t temperature) {
+	return ((175.72 * temperature) / 256.0) - 46.85;
+}
+
+float ws_sensor_hum_to_f(uint8_t humidity) {
+	return ((125.0 * humidity) / 256.0) - 6.0;
+}
+
+float ws_sensor_atm_to_f(uint8_t atmospheric_pressure) {
+	return ((20.0 * atmospheric_pressure) / 256.0) + 990.0; // datasheet no?
+}
diff --git a/shared/util.h b/shared/util.h
index 690a999..1bee487 100644
--- a/shared/util.h
+++ b/shared/util.h
@@ -1,8 +1,23 @@
 #pragma once
 
+#include <stdint.h>
+
 #define WS_MIN(a, b) (((a) < (b)) ? (a) : (b))
 #define WS_MAX(a, b) (((a) > (b)) ? (a) : (b))
 
 /** @brief take the log base 16 of `x` */
 unsigned int ws_log16(unsigned int x);
 
+/** @brief convert 16-bit temperature value to uint8_t */
+uint8_t ws_sensor_tmp_to_8(uint16_t temperature);
+/** @brief convert 16-bit humidity value to uint8_t */
+uint8_t ws_sensor_hum_to_8(uint16_t humidity);
+/** @brief convert 16-bit atmospheric pressure value to uint8_t */
+uint8_t ws_sensor_atm_to_8(uint16_t atmospheric_pressure);
+
+/** @brief convert 8-bit temperature value back to float */
+float ws_sensor_tmp_to_f(uint8_t temperature);
+/** @brief convert 8-bit humidity value back to float */
+float ws_sensor_hum_to_f(uint8_t humidity);
+/** @brief convert 8-bit atmospheric pressure value back to float */
+float ws_sensor_atm_to_f(uint8_t atmospheric_pressure);