Added sht4.c, sht4x.h

sht4x.h

@@ -0,0 +1,53 @@
+/*
+ * sht4x.h
+ *
+ *  Created on: Jun 8, 2021
+ *      Author: user
+ */
+
+#ifndef INC_SHT4X_H_
+#define INC_SHT4X_H_
+
+#include "stdint.h"
+
+/*
+ * Defines & macros
+ */
+
+#define SHT4X_I2C_ADDRESS 0x44
+
+/*
+ * Return values
+ */
+
+#define SHT4X_OK 0
+#define SHT4X_ERROR -1 // generic error
+#define SHT4X_CRC8_ERROR -2 // checksum failed
+
+/*
+ * Data types
+ */
+
+typedef enum {
+	SHT4X_START_MEAS_HIGH_PRECISION = 0xFD,
+	SHT4X_START_MEAS_MEDIUM_PRECISION = 0xF6,
+	SHT4X_START_MEAS_LOW_PRECISION = 0xE0,
+	SHT4X_READ_SERIAL = 0x89,
+	SHT4X_SOFT_RESET = 0x94,
+	SHT4X_HEATER_200_mW_1_s = 0x39,
+	SHT4X_HEATER_200_mW_01_s = 0x32,
+	SHT4X_HEATER_110_mW_1_s = 0x2F,
+	SHT4X_HEATER_110_mW_01_s = 0x24,
+	SHT4X_HEATER_20_mW_1_s = 0x1E,
+	SHT4X_HEATER_20_mW_01_s = 0x15
+} sht4x_cmd_t;
+
+/*
+ * Function prototypes
+ */
+
+int8_t sht4x_send_cmd(sht4x_cmd_t cmd);
+int8_t sht4x_read_data(uint8_t *buffer, int len);
+int8_t sht4x_measure(int16_t *temperature, uint16_t *relative_humidity);
+
+#endif /* INC_SHT4X_H_ */