- //////////////////////////////////////////////////////////////////////////////////////////
- #define _SH15_DEFINE_
- #include "includes.h"
- #define DELAY_CNT (5)
- //////////////////////////////////////////////////////////////////////////////////////////
- //static void TransStart ( void );
- //static uchar WriteByte ( uchar sendData );
- //static uchar ReadByte ( uchar ack );
- //static uchar SH15_GetChecksum ( uchar * pbuf, uchar cmd, uchar len );
- //static uchar SH15_GetMeasureVal ( uchar *pbuf, uchar mode );
- static void DelayShort ( unsigned char cnt );
- static uchar StartI2C ( void );
- static uchar StopI2C ( void );
- static void AckI2C ( void );
- static void NoAckI2C1 ( void );
- static uchar RecieveByte ( uchar ack );
- static uchar SendByte ( uchar TransmitByte );
- uchar SoftResetSHT35 ( void );
- static uchar CaculateCRC8 ( uchar *check_data, uchar num_of_data );
- static uchar SetSHT35OneMeasure ( void );
- static uchar ReadSHT35OneMeasureValue ( uchar *pbuf );
- static uchar SHT35_GetTemeratureAndHumidity ( void );
- const uchar CRC_TABLE[256] = { 0, 49, 98, 83,196,245,166,151, //0
- 185,136,219,234,125, 76, 31, 46, //8
- 67,114, 33, 16,135,182,229,212, //16
- 250,203,152,169, 62, 15, 92,109, //24
- 134,183,228,213, 66,115, 32, 17, //32
- 63, 14, 93,108,251,202,153,168, //40
- 197,244,167,150, 1, 48, 99, 82, //48
- 124, 77, 30, 47,184,137,218,235, //56
- 61, 12, 95,110,249,200,155,170, //64
- 132,181,230,215,064,113, 34, 19, //72
- 126, 79, 28, 45,186,139,216,233, //80
- 199,246,165,148, 3, 50, 97, 80, //88
- 187,138,217,232,127, 78, 29, 44, //96
- 2, 51, 96, 81,198,247,164,149, //104
- 248,201,154,171, 60, 13, 94,111, //112
- 65,112, 35, 18,133,180,231,214, //120
- 122, 75, 24, 41,190,143,220,237, //128
- 195,242,161,144, 7, 54,101, 84, //136
-
- 57, 8, 91,106,253,204,159,174, //144
- 128,177,226,211, 68,117, 38, 23, //152
- 252,205,158,175, 56, 9, 90,107, //160
- 69,116, 39, 22,129,176,227,210, //168
- 191,142,221,236,123, 74, 25, 40, //176
- 6, 55,100, 85,194,243,160,145, //184
- 71,118, 37, 20,131,178,225,208, //192
- 254,207,156,173, 58, 11, 88,105, //200
- 4, 53,102, 87,192,241,162,147, //208
- 189,140,223,238,121, 72, 27, 42, //216
- 193,240,163,146, 5, 52,103, 86, //224
- 120, 73, 26, 43,188,141,222,239, //232
- 130,179,224,209, 70,119, 36, 21, //240
- 59, 10, 89,104,255,206,157,172 //248
- };
- static uint16 xdata s_T[5];
- static uint16 xdata s_H[5];
- static uchar s_sht35ReadErrCnt;
- /*
- **********************************************************************************************
- ** Function name : DelayShort
- **
- ** Descriptions : Ñóê±oˉêy >1us
- **
- ** Parameters : êäèë2Îêy£o
- ** 1)cnt: Ñóê±¼ÆêyÆ÷
- **
- ** Returned value : none
- **
- ***********************************************************************************************
- */
- static void DelayShort ( unsigned char cnt )
- {
- while ( cnt-- );
- }
- /*
- *****************************************************************************************
- * fuction name: AckI2C
- *
- * Description : this function generates a acknowdge signal in I2C bus by CPU.
- *
- * Arguments : none
- *
- * returns : none
- *
- * Notes :
- ******************************************************************************************
- */
- static void AckI2C ( void )
- {
- // SH15_SDA_OUT;
- // SH15_SCL_OUT;
-
- SH15_SCL_L;
- DelayShort ( 5 );
- SH15_SDA_L;
- DelayShort ( 5 );
- SH15_SCL_H;
- DelayShort ( 5 );
-
- SH15_SCL_L;
- DelayShort ( 1 );
-
- return ;
- }
- /*
- *****************************************************************************************
- * fuction name: NoAckI2C
- *
- * Description : this function generates a no acknowdge signal in I2C bus by CPU.
- *
- * Arguments : none
- *
- * returns : none
- *
- * Notes :
- ******************************************************************************************
- */
- static void NoAckI2C( void )
- {
- //SH15_SDA_OUT;
- //SH15_SCL_OUT;
-
- SH15_SCL_L;
- DelayShort ( 5 );
- SH15_SDA_H;
- DelayShort ( 5 );
- SH15_SCL_H;
- DelayShort ( 5 );
- SH15_SCL_L;
- DelayShort ( 5 );
- SH15_SDA_L;
- DelayShort ( 1 );
-
- return ;
- }
- /*
- *****************************************************************************************
- * fuction name: StartI2C
- *
- * Description : this function generates a start condition in I2C bus.
- *
- * Arguments : none
- *
- * returns : none
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar StartI2C ( void )
- {
- //SH15_SDA_OUT;
- //SH15_SCL_OUT;
-
- SH15_SDA_H; //send data signal of start condition
- DelayShort ( 5 );
- SH15_SCL_H; //send clock signal of start condition
- DelayShort ( 5 ); //here the time must be more bigger than 4.7us
- SH15_SDA_L; //send start condition singal
- DelayShort ( 5 ); //>4us
- SH15_SCL_L; //make the I2C bus ready to send or recieve data
-
- return TRUE;
- }
- /*
- *****************************************************************************************
- * fuction name: StopI2C
- *
- * Description : this function generates a stop condition in I2C bus.
- *
- * Arguments : none
- *
- * returns : none
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar StopI2C ( void )
- {
- //SH15_SDA_OUT;
- //SH15_SCL_OUT;
-
- SH15_SDA_L; //send data signal of stop condition
- SH15_SCL_L;
- DelayShort ( 5 );
- SH15_SCL_H; //send clock signal of stop condition
- DelayShort ( 5 ); //here the time must be more bigger than 4us
- SH15_SDA_H; //send start condition singal
- DelayShort ( 5 ); //>4us
-
- return TRUE;
- }
- /*
- *****************************************************************************************
- * fuction name: RecieveByte
- *
- * Description : this function receive a byte from I2C bus.
- *
- * Arguments : none
- *
- * returns : unsigned char, recieved byte from I2C bus.
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar RecieveByte ( uchar ack )
- {
- uchar i;
- uchar RecieveByte = 0;
-
- //SH15_SDA_H;
- //SH15_SDA_IN;
-
- for ( i=0; i<8; i++ )
- {
- RecieveByte <<= 1;
- SH15_SCL_L;
- DelayShort ( 5 ); //>4us
- SH15_SCL_H;
-
- DelayShort ( 5 ); //>4us
- if ( SH15_SDA )
- RecieveByte += 1;
- }
-
- SH15_SCL_L;
-
- if ( ack == 0 )
- NoAckI2C ( );
- else
- AckI2C ( );
-
- return ( RecieveByte );
- }
-
- /*
- *****************************************************************************************
- * fuction name: TransmitByte
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar SendByte ( uchar TransmitByte )
- {
- uchar i;
- uchar Ack;
- // SH15_SDA_OUT;
- Ack = FALSE;
- SH15_SCL_L;
-
- for ( i=0; i<8; i++ )
- {
- SH15_SCL_L;
- DelayShort ( 5 ); //>4us
- if ( TransmitByte&0x80 )
- SH15_SDA_H;
- else
- SH15_SDA_L;
- DelayShort ( 5 ); //>4us
- SH15_SCL_H;
- DelayShort ( 5 ); //>4us
- TransmitByte <<= 1;
- }
-
- SH15_SCL_L;
- SH15_SDA_H;
- // SH15_SDA_IN; //input mode
-
- SH15_SCL_H;
- DelayShort ( 5 ); //>4us
-
- i = 30;
- while ( SH15_SDA ) {
- i--;
- DelayShort ( 5 ); //>4us
-
- if ( i == 0 ) {
- break;
- }
- DelayShort ( 5 );
- }
- if ( i == 0 )
- Ack = FALSE;
- else
- Ack = TRUE;
-
- SH15_SCL_H;
- DelayShort ( 5 );
- SH15_SCL_L;
- // SH15_SDA_OUT;
-
- return ( Ack );
- }
- /*
- *****************************************************************************************
- * fuction name: SoftResetSHT35
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- uchar SoftResetSHT35 ( void )
- {
- uchar ret;
- //ioport_set_pin_dir(SH15SCL_GPIO, IOPORT_DIR_OUTPUT);
- //ioport_set_pin_dir(SH15SDA_GPIO, IOPORT_DIR_OUTPUT);
- //ioport_set_pin_mode(SH15SDA_GPIO, IOPORT_MODE_PULLUP);
-
- StartI2C ( );
-
- ret = SendByte ( SHT35_ADDR );
- if ( ret == FALSE ) return FALSE;
-
- ret = SendByte ( SHT35_SOFT_RST_CMD_MSB );
- if ( ret == FALSE ) return FALSE;
-
- ret = SendByte ( SHT35_SOFT_RST_CMD_LSB );
- if ( ret == FALSE ) return FALSE;
-
- StopI2C ( );
- return TRUE;
- }
- /*
- *****************************************************************************************
- * fuction name: CaculateCRC8
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- uchar CaculateCRC8 ( uchar *check_data, uchar num_of_data )
- {
- uchar j; // bit mask
- uchar crc = 0xFF; // calculated checksum
- uchar i; // byte counter
- // calculates 8-Bit checksum with given polynomial
- for( i = 0; i < num_of_data; i++) {
- crc ^= check_data[i];
- //crc?????????????0x31
- for( j = 8; j > 0; --j ) {
- if(crc & 0x80) {
- crc = (crc << 1) ^ 0x31;
- } else {
- crc = (crc << 1);
- }
- }
- }
- return crc;
- }
- /*
- *****************************************************************************************
- * fuction name: SHT35_GetTemeratureAndHumidity
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- uchar SHT35_GetTemeratureAndHumidity (void )
- {
- uchar ret;
- uchar buf[6];
- uint16 tempInt;
- uint32 tempL;
- float tempF;
-
- ret = SoftResetSHT35();
- if ( ret == FALSE ) return FALSE;
-
- ret = ReadSHT35OneMeasureValue( buf );
- if ( ret == FALSE ) return FALSE;
-
- // s_sht35ReadErrCnt = 0;
-
- tempInt = (((uint16)buf[0]) << 8) | buf[1];
- tempF = ((175.0 * ((float)tempInt) / 65535.0 - 45.0));
- g_FT = tempF;
-
- s_T[0] = s_T[1];
- s_T[1] = s_T[2];
-
- if ( tempF > 0.0 )
- {
- s_T[2] = (uint16)((uint32)(tempF*10))&0xffff; //1?????
- if ( g_TFlag == 1 )
- {
- g_TFlag = 0;
- s_T[0] = 0;
- }
- }
- else
- {
- s_T[2] = (uint16)((uint32)(tempF*(-1)*10))&0xffff; //1?????
- if ( g_TFlag == 0 )
- {
- g_TFlag = 1;
- s_T[0] = 0;
- }
- }
- tempL = s_T[0]+s_T[1]+s_T[2];
- //g_measureDlyDisp |= 0x01;
- g_temperatureSH15 =s_T[2];
- //s_T[2];
- //;
- // 11
- /*
- if ( g_TFlag == 1 ) // 11
- {
- g_status &= 0xfb;
- }
- else //+
- {
- if ( g_temperatureSH15 > 600 )
- g_status |= 0x04;
- else
- g_status &= 0xfb;
- }
- */
- //humidity
- //g_measureDlyDisp |= 0x02;
- tempInt = (((uint16)buf[3]) << 8) | buf[4];
- tempF = ((100.0 * ((float)tempInt) / 65535.0) );
-
-
- if ( (tempF > 99.0) || (tempF < 0.1) ) return FALSE;
-
- s_H[0] = s_H[1];
- s_H[1] = s_H[2];
-
- s_H[2] = (uint16)((uint32)(tempF*10))&0xffff; //
- g_humidity =s_H[2];
-
-
-
- return TRUE;
- }
- /*
- *****************************************************************************************
- * fuction name: ReadSHT35OneMeasureValue
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar ReadSHT35OneMeasureValue ( uchar *pbuf )
- {
- uchar ret;
- uchar crc8;
- uchar s_sht35OneShotFlag;
- uchar stretchClockDly;
-
- s_sht35OneShotFlag=SetSHT35OneMeasure();
-
- if (s_sht35OneShotFlag==FALSE)
- {
- g_temperatureSH15=0001;
- return FALSE;
- }
-
- DelayShort(30000);
-
-
- StartI2C ( );
- ret = SendByte ( SHT35_ADDR+1 ); //read cmd with clock stretching
- if ( ret == FALSE ) return FALSE;
-
- /*
- stretchClockDly = 100;
- //SH15_SCL_IN;
- while ( stretchClockDly > 0 ) {
- stretchClockDly--;
- //if ( SH15_SCL== 1 )
- // break;
- }
- //SH15_SCL_OUT;
- // if ( stretchClockDly == 0 )
- // return FALSE;
- */
-
- pbuf[0] = RecieveByte ( 1 ); //ACK
- pbuf[1] = RecieveByte ( 1 ); //ACK
- pbuf[2] = RecieveByte ( 1 ); //ACK
- pbuf[3] = RecieveByte ( 1 ); //ACK
- pbuf[4] = RecieveByte ( 1 ); //ACK
- pbuf[5] = RecieveByte ( 0); //ACK
- StopI2C ( );
- //crc checksum
- crc8 = CaculateCRC8 ( pbuf, 2 );
- if ( crc8 != pbuf[2] )
- {
- g_temperatureSH15 =0002;
- return FALSE;
- }
- crc8 = CaculateCRC8 ( pbuf+3, 2 );
- if ( crc8 != pbuf[5])
- {
- //g_temperatureSH15 =0004;
- return FALSE;
- }
-
- return TRUE;
- }
- /*
- *****************************************************************************************
- * fuction name: SetSHT35OneMeasure
- *
- * Description : this function transmit a byte from I2C bus.
- *
- * Arguments : unsigned char, transmit byte in I2C bus.
- *
- * returns : bit, acknowdge flag.
- *
- * Notes :
- ******************************************************************************************
- */
- static uchar SetSHT35OneMeasure ( void )
- {
- uchar ret;
- StartI2C ( );
- ret = SendByte ( SHT35_ADDR );
- if ( ret == FALSE )
- {
- return FALSE;
- }
- ret = SendByte ( SHT35_ONE_SHOT_CMD_MSB );
- if ( ret == FALSE )
- {
- return FALSE;
- }
- ret = SendByte ( SHT35_ONE_SHOT_CMD_LSB );
- if ( ret == FALSE )
- {
- return FALSE;
- }
-
- StopI2C ( );
-
- return TRUE;
- }
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