drivers: sensor: STCC4 Add Driver

This adds support for Sensirion's STCC4 co2 sensor.

Signed-off-by: Jan Faeh <jan.faeh@sensirion.com>

Author: jfaeh

drivers/sensor/sensirion/CMakeLists.txt

@@ -2,10 +2,12 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # zephyr-keep-sorted-start
+add_subdirectory(sensirion_core)
 add_subdirectory_ifdef(CONFIG_SCD4X scd4x)
 add_subdirectory_ifdef(CONFIG_SGP40 sgp40)
 add_subdirectory_ifdef(CONFIG_SHT3XD sht3xd)
 add_subdirectory_ifdef(CONFIG_SHT4X sht4x)
 add_subdirectory_ifdef(CONFIG_SHTCX shtcx)
+add_subdirectory_ifdef(CONFIG_STCC4 stcc4)
 add_subdirectory_ifdef(CONFIG_STS4X sts4x)
 # zephyr-keep-sorted-stop

drivers/sensor/sensirion/Kconfig

@@ -7,5 +7,6 @@ source "drivers/sensor/sensirion/sgp40/Kconfig"
 source "drivers/sensor/sensirion/sht3xd/Kconfig"
 source "drivers/sensor/sensirion/sht4x/Kconfig"
 source "drivers/sensor/sensirion/shtcx/Kconfig"
+source "drivers/sensor/sensirion/stcc4/Kconfig"
 source "drivers/sensor/sensirion/sts4x/Kconfig"
 # zephyr-keep-sorted-stop

drivers/sensor/sensirion/sensirion_core/CMakeLists.txt

@@ -0,0 +1,11 @@
+# ST Microelectronics stmemsc hal i/f
+#
+# Copyright (c) 2021 STMicroelectronics
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+zephyr_library()
+
+zephyr_library_sources(sensirion_common.c)
+zephyr_library_sources(sensirion_i2c.c)
+zephyr_library_sources(crc_tables.c)

drivers/sensor/sensirion/sensirion_core/crc_tables.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025 Sensirion
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+
+uint8_t crc8_poly31_table[256] = {
+	0x00, 0x31, 0x62, 0x53, 0xC4, 0xF5, 0xA6, 0x97, 0xB9, 0x88, 0xDB, 0xEA, 0x7D, 0x4C, 0x1F,
+	0x2E, 0x43, 0x72, 0x21, 0x10, 0x87, 0xB6, 0xE5, 0xD4, 0xFA, 0xCB, 0x98, 0xA9, 0x3E, 0x0F,
+	0x5C, 0x6D, 0x86, 0xB7, 0xE4, 0xD5, 0x42, 0x73, 0x20, 0x11, 0x3F, 0x0E, 0x5D, 0x6C, 0xFB,
+	0xCA, 0x99, 0xA8, 0xC5, 0xF4, 0xA7, 0x96, 0x01, 0x30, 0x63, 0x52, 0x7C, 0x4D, 0x1E, 0x2F,
+	0xB8, 0x89, 0xDA, 0xEB, 0x3D, 0x0C, 0x5F, 0x6E, 0xF9, 0xC8, 0x9B, 0xAA, 0x84, 0xB5, 0xE6,
+	0xD7, 0x40, 0x71, 0x22, 0x13, 0x7E, 0x4F, 0x1C, 0x2D, 0xBA, 0x8B, 0xD8, 0xE9, 0xC7, 0xF6,
+	0xA5, 0x94, 0x03, 0x32, 0x61, 0x50, 0xBB, 0x8A, 0xD9, 0xE8, 0x7F, 0x4E, 0x1D, 0x2C, 0x02,
+	0x33, 0x60, 0x51, 0xC6, 0xF7, 0xA4, 0x95, 0xF8, 0xC9, 0x9A, 0xAB, 0x3C, 0x0D, 0x5E, 0x6F,
+	0x41, 0x70, 0x23, 0x12, 0x85, 0xB4, 0xE7, 0xD6, 0x7A, 0x4B, 0x18, 0x29, 0xBE, 0x8F, 0xDC,
+	0xED, 0xC3, 0xF2, 0xA1, 0x90, 0x07, 0x36, 0x65, 0x54, 0x39, 0x08, 0x5B, 0x6A, 0xFD, 0xCC,
+	0x9F, 0xAE, 0x80, 0xB1, 0xE2, 0xD3, 0x44, 0x75, 0x26, 0x17, 0xFC, 0xCD, 0x9E, 0xAF, 0x38,
+	0x09, 0x5A, 0x6B, 0x45, 0x74, 0x27, 0x16, 0x81, 0xB0, 0xE3, 0xD2, 0xBF, 0x8E, 0xDD, 0xEC,
+	0x7B, 0x4A, 0x19, 0x28, 0x06, 0x37, 0x64, 0x55, 0xC2, 0xF3, 0xA0, 0x91, 0x47, 0x76, 0x25,
+	0x14, 0x83, 0xB2, 0xE1, 0xD0, 0xFE, 0xCF, 0x9C, 0xAD, 0x3A, 0x0B, 0x58, 0x69, 0x04, 0x35,
+	0x66, 0x57, 0xC0, 0xF1, 0xA2, 0x93, 0xBD, 0x8C, 0xDF, 0xEE, 0x79, 0x48, 0x1B, 0x2A, 0xC1,
+	0xF0, 0xA3, 0x92, 0x05, 0x34, 0x67, 0x56, 0x78, 0x49, 0x1A, 0x2B, 0xBC, 0x8D, 0xDE, 0xEF,
+	0x82, 0xB3, 0xE0, 0xD1, 0x46, 0x77, 0x24, 0x15, 0x3B, 0x0A, 0x59, 0x68, 0xFF, 0xCE, 0x9D,
+	0xAC};

drivers/sensor/sensirion/sensirion_core/sensirion_common.c

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2025 Sensirion
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "sensirion_common.h"
+
+uint16_t sensirion_common_bytes_to_uint16_t(const uint8_t *bytes)
+{
+	return (uint16_t)bytes[0] << 8 | (uint16_t)bytes[1];
+}
+
+uint32_t sensirion_common_bytes_to_uint32_t(const uint8_t *bytes)
+{
+	return (uint32_t)bytes[0] << 24 | (uint32_t)bytes[1] << 16 | (uint32_t)bytes[2] << 8 |
+	       (uint32_t)bytes[3];
+}
+
+int16_t sensirion_common_bytes_to_int16_t(const uint8_t *bytes)
+{
+	return (int16_t)sensirion_common_bytes_to_uint16_t(bytes);
+}
+
+int32_t sensirion_common_bytes_to_int32_t(const uint8_t *bytes)
+{
+	return (int32_t)sensirion_common_bytes_to_uint32_t(bytes);
+}
+
+float sensirion_common_bytes_to_float(const uint8_t *bytes)
+{
+	union {
+		uint32_t u32_value;
+		float float32;
+	} tmp;
+
+	tmp.u32_value = sensirion_common_bytes_to_uint32_t(bytes);
+	return tmp.float32;
+}
+
+void sensirion_common_uint32_t_to_bytes(const uint32_t value, uint8_t *bytes)
+{
+	bytes[0] = (uint8_t)(value >> 24);
+	bytes[1] = (uint8_t)(value >> 16);
+	bytes[2] = (uint8_t)(value >> 8);
+	bytes[3] = (uint8_t)(value);
+}
+
+void sensirion_common_uint16_t_to_bytes(const uint16_t value, uint8_t *bytes)
+{
+	bytes[0] = (uint8_t)(value >> 8);
+	bytes[1] = (uint8_t)value;
+}
+
+void sensirion_common_int32_t_to_bytes(const int32_t value, uint8_t *bytes)
+{
+	bytes[0] = (uint8_t)(value >> 24);
+	bytes[1] = (uint8_t)(value >> 16);
+	bytes[2] = (uint8_t)(value >> 8);
+	bytes[3] = (uint8_t)value;
+}
+
+void sensirion_common_int16_t_to_bytes(const int16_t value, uint8_t *bytes)
+{
+	bytes[0] = (uint8_t)(value >> 8);
+	bytes[1] = (uint8_t)value;
+}
+
+void sensirion_common_float_to_bytes(const float value, uint8_t *bytes)
+{
+	union {
+		uint32_t u32_value;
+		float float32;
+	} tmp;
+	tmp.float32 = value;
+	sensirion_common_uint32_t_to_bytes(tmp.u32_value, bytes);
+}
+
+void sensirion_common_copy_bytes(const uint8_t *source, uint8_t *destination, uint16_t data_length)
+{
+	uint16_t i;
+
+	for (i = 0; i < data_length; i++) {
+		destination[i] = source[i];
+	}
+}
+
+void sensirion_common_to_integer(const uint8_t *source, uint8_t *destination, INT_TYPE int_type,
+				 uint8_t data_length)
+{
+	if (data_length > int_type) {
+		data_length = 0;
+	}
+
+	uint8_t offset = int_type - data_length;
+
+	for (uint8_t i = 0; i < offset; i++) {
+		destination[int_type - i - 1] = 0;
+	}
+
+	for (uint8_t i = 1; i <= data_length; i++) {
+		destination[int_type - offset - i] = source[i - 1];
+	}
+}

drivers/sensor/sensirion/sensirion_core/sensirion_common.h

@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2025 Sensirion
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef SENSIRION_COMMON_H
+#define SENSIRION_COMMON_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define NO_ERROR              0
+#define NOT_IMPLEMENTED_ERROR ENOSYS
+
+#define SENSIRION_COMMAND_SIZE     2
+#define SENSIRION_WORD_SIZE        2
+#define SENSIRION_NUM_WORDS(x)     (sizeof(x) / SENSIRION_WORD_SIZE)
+#define SENSIRION_MAX_BUFFER_WORDS 32
+
+/**
+ * Enum to describe the type of an integer
+ */
+typedef enum {
+	BYTE = 1,
+	SHORT = 2,
+	INTEGER = 4,
+	LONG_INTEGER = 8
+} INT_TYPE;
+
+/**
+ * sensirion_common_bytes_to_int16_t() - Convert an array of bytes to an int16_t
+ *
+ * Convert an array of bytes received from the sensor in big-endian/MSB-first
+ * format to an int16_t value in the correct system-endianness.
+ *
+ * @param bytes An array of at least two bytes (MSB first)
+ * @return      The byte array represented as int16_t
+ */
+int16_t sensirion_common_bytes_to_int16_t(const uint8_t *bytes);
+
+/**
+ * sensirion_common_bytes_to_int32_t() - Convert an array of bytes to an int32_t
+ *
+ * Convert an array of bytes received from the sensor in big-endian/MSB-first
+ * format to an int32_t value in the correct system-endianness.
+ *
+ * @param bytes An array of at least four bytes (MSB first)
+ * @return      The byte array represented as int32_t
+ */
+int32_t sensirion_common_bytes_to_int32_t(const uint8_t *bytes);
+
+/**
+ * sensirion_common_bytes_to_uint16_t() - Convert an array of bytes to an
+ * uint16_t
+ *
+ * Convert an array of bytes received from the sensor in big-endian/MSB-first
+ * format to an uint16_t value in the correct system-endianness.
+ *
+ * @param bytes An array of at least two bytes (MSB first)
+ * @return      The byte array represented as uint16_t
+ */
+uint16_t sensirion_common_bytes_to_uint16_t(const uint8_t *bytes);
+
+/**
+ * sensirion_common_bytes_to_uint32_t() - Convert an array of bytes to an
+ * uint32_t
+ *
+ * Convert an array of bytes received from the sensor in big-endian/MSB-first
+ * format to an uint32_t value in the correct system-endianness.
+ *
+ * @param bytes An array of at least four bytes (MSB first)
+ * @return      The byte array represented as uint32_t
+ */
+uint32_t sensirion_common_bytes_to_uint32_t(const uint8_t *bytes);
+
+/**
+ * sensirion_common_bytes_to_float() - Convert an array of bytes to a float
+ *
+ * Convert an array of bytes received from the sensor in big-endian/MSB-first
+ * format to an float value in the correct system-endianness.
+ *
+ * @param bytes An array of at least four bytes (MSB first)
+ * @return      The byte array represented as float
+ */
+float sensirion_common_bytes_to_float(const uint8_t *bytes);
+
+/**
+ * sensirion_common_uint32_t_to_bytes() - Convert an uint32_t to an array of
+ * bytes
+ *
+ * Convert an uint32_t value in system-endianness to big-endian/MBS-first
+ * format to send to the sensor.
+ *
+ * @param value Value to convert
+ * @param bytes An array of at least four bytes
+ */
+void sensirion_common_uint32_t_to_bytes(const uint32_t value, uint8_t *bytes);
+
+/**
+ * sensirion_common_uint16_t_to_bytes() - Convert an uint16_t to an array of
+ * bytes
+ *
+ * Convert an uint16_t value in system-endianness to big-endian/MBS-first
+ * format to send to the sensor.
+ *
+ * @param value Value to convert
+ * @param bytes An array of at least two bytes
+ */
+void sensirion_common_uint16_t_to_bytes(const uint16_t value, uint8_t *bytes);
+
+/**
+ * sensirion_common_int32_t_to_bytes() - Convert an int32_t to an array of bytes
+ *
+ * Convert an int32_t value in system-endianness to big-endian/MBS-first
+ * format to send to the sensor.
+ *
+ * @param value Value to convert
+ * @param bytes An array of at least four bytes
+ */
+void sensirion_common_int32_t_to_bytes(const int32_t value, uint8_t *bytes);
+
+/**
+ * sensirion_common_int16_t_to_bytes() - Convert an int16_t to an array of bytes
+ *
+ * Convert an int16_t value in system-endianness to big-endian/MBS-first
+ * format to send to the sensor.
+ *
+ * @param value Value to convert
+ * @param bytes An array of at least two bytes
+ */
+void sensirion_common_int16_t_to_bytes(const int16_t value, uint8_t *bytes);
+
+/**
+ * sensirion_common_float_to_bytes() - Convert an float to an array of bytes
+ *
+ * Convert an float value in system-endianness to big-endian/MBS-first
+ * format to send to the sensor.
+ *
+ * @param value Value to convert
+ * @param bytes An array of at least four bytes
+ */
+void sensirion_common_float_to_bytes(const float value, uint8_t *bytes);
+
+/**
+ * sensirion_common_copy_bytes() - Copy bytes from one array to the other.
+ *
+ * @param source      Array of bytes to be copied.
+ * @param destination Array of bytes to be copied to.
+ * @param data_length Number of bytes to copy.
+ */
+void sensirion_common_copy_bytes(const uint8_t *source, uint8_t *destination, uint16_t data_length);
+
+/**
+ * sensirion_common_to_integer() - Copy bytes from byte array to integer.
+ *
+ * @param source      Array of bytes to be copied.
+ * @param int_value Pointer to integer of bytes to be copied to.
+ * @param int_type Type (size) of the integer to be copied.
+ * @param data_length Number of bytes to copy.
+ */
+void sensirion_common_to_integer(const uint8_t *source, uint8_t *destination, INT_TYPE int_type,
+				 uint8_t data_length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SENSIRION_COMMON_H */