SENSIRION SCD30 二氧化碳传感器 I2C 通信参数及相关命令

SENSIRION SCD30 二氧化碳传感器

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I2C 地址: 0x61

I2C 通信速率: 100KHz

特别注意: SCD30 要求与其通信的 I2C Master 主机，必须支持 clock stretching 时钟延展 (12mS,150mS)

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SCD30 I2C 命令

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static const uint8_t SCD30_I2C_ADDRESS = 0x61;

#define SCD30_CMD_START_PERIODIC_MEASUREMENT   {0x00,0x10}
#define SCD30_CMD_STOP_PERIODIC_MEASUREMENT    {0x01,0x04}
#define SCD30_CMD_SET_MEASUREMENT_INTERVAL     {0x46,0x00}
#define SCD30_CMD_GET_DATA_READY               {0x02,0x02}
#define SCD30_CMD_READ_MEASUREMENT             {0x03,0x00}
#define SCD30_CMD_AUTO_SELF_CALIBRATION        {0x53,0x06}
#define SCD30_CMD_SET_FORCED_RECALIBRATION     {0x52,0x04}
#define SCD30_CMD_SET_TEMPERATURE_OFFSET       {0x54,0x03}
#define SCD30_CMD_SET_ALTITUDE_COMPENSATION    {0x51,0x02}
#define SCD30_CMD_SOFT_RESET                   {0xD3,0x04}

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I2C 通信中数据的 CRC 校验

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I2C CRC 校验程序 (Polynomial 0x31 , CRC 初始值 0xFF)

static const unsigned char crc_table[] =
{
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
};

unsigned char crc8scd30(unsigned char *ptr, unsigned char len)
{
		unsigned char crc = 0xFF;

		while (len--)
		{
				crc = crc_table[crc ^ *ptr++];
		}
		return (crc);
}