n_barroca
Joined: 13 Jul 2010
Posts: 2
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| Temperature Sensor - SHT15 Problem |
 Posted: Tue Jul 13, 2010 7:35 am |
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Bought one Humidity and Temperature Sensor - SHT15 and I used the CCS C Compiler (http://www.ccsinfo.com/) but I have several errors in the C code. For example in the declaration #pragma origin 4, I got the error Invalid Pre-Processor directive can someone help me?
The code is:
| Code: |
/*
2-1-07
Nathan Seidle
nathan at sparkfun.com
Copyright Spark Fun Electronics© 2007
Pseudo Sensirion I2C interface example code
Uses 16F88 with bootloader for testing
Reports the Humidity and Temperature in obfuscated form.
Please see Sensirion datasheet for translation equations
9-28-07 Correction by Iván Sarmiento. There was a small bug in the 16bit read.
*/
#define Clock_8MHz
#define Baud_9600
#include <16F88.h> // device dependent interrupt definitions
#pragma origin 4
#define STATUS_LED PORTB.3
#define WRITE_sda() TRISB = TRISB & 0b.1011.1111 //SDA must be output when writing
#define READ_sda() TRISB = TRISB | 0b.0100.0000 //SDA must be input when reading - don't forget the resistor on SDA!!
#define SCK PORTB.7
#define SDA PORTB.6
#define CHECK_TEMP 0b.0000.0011
#define CHECK_HUMD 0b.0000.0101
#define CHECK_STAT 0b.0000.0111
#define WRITE_STAT 0b.0000.0110
void boot_up(void);
void sht15_start(void);
void sht15_read(void);
void sht15_send_byte(uns8 sht15_command);
uns16 sht15_read_byte16(void);
void delay_ms(uns16);
void printf(const char *nate, int16 my_byte);
void main(void)
{
uns8 choice;
boot_up();
delay_ms(100);
printf("\nSHT15 Testing", 0);
sht15_read();
printf("\nDone", 0);
while(1);
}//End Main
void boot_up(void)
{
//OSCCON = 0b.0111.0000; //Setup internal oscillator for 8MHz
//while(OSCCON.2 == 0); //Wait for frequency to stabilize
//Setup Ports
ANSEL = 0b.0000.0000; //Turn off A/D
PORTA = 0b.0000.0000;
TRISA = 0b.0000.0000;
PORTB = 0b.0000.0000;
TRISB = 0b.0000.0100; //0 = Output, 1 = Input RX on RB2
//Setup the hardware UART module
//=============================================================
SPBRG = 51; //8MHz for 9600 inital communication baud rate
//SPBRG = 129; //20MHz for 9600 inital communication baud rate
TXSTA = 0b.0010.0100; //8-bit asych mode, high speed uart enabled
RCSTA = 0b.1001.0000; //Serial port enable, 8-bit asych continous receive mode
//=============================================================
}
//Init the sensor and read out the humidity and temperature data
void sht15_read(void)
{
uns24 response;
//Issue command start
sht15_start();
//Now send command code
sht15_send_byte(CHECK_HUMD);
response = sht15_read_byte16();
printf("\nHumidity is %d", response);
sht15_start();
sht15_send_byte(CHECK_TEMP);
response = sht15_read_byte16(); //Listen for response from SHT15
printf("\nTemperature is %d", response);
}
void sht15_send_byte(uns8 sht15_command)
{
uns8 i;
WRITE_sda();
for(i = 0 ; i < 8 ; i++)
{
sht15_command = rl(sht15_command);
SCK = 0;
SDA = Carry;
SCK = 1;
}
//Wait for SHT15 to acknowledge.
SCK = 0;
READ_sda();
while (SDA == 1); //Wait for SHT to pull line low
SCK = 1;
SCK = 0; //Falling edge of 9th clock
while (SDA == 0); //Wait for SHT to release line
//Wait for SHT15 to pull SDA low to signal measurement completion.
//This can take up to 210ms for 14 bit measurements
i = 0;
while (SDA == 1) //Wait for SHT to pull line low
{
i++;
if (i == 255) break;
delay_ms(10);
}
//Debug info
i *= 10; //Convert to ms
printf("\nResponse time = %dms", i); //Debug to see how long response took
}
//Specific SHT start command
void sht15_start(void)
{
WRITE_sda();
SDA = 1;
SCK = 1;
SDA = 0;
SCK = 0;
SCK = 1;
SDA = 1;
SCK = 0;
}
//Read 16 bits from the SHT sensor
uns16 sht15_read_byte16(void)
{
uns8 j;
uns16 in_byte;
SCK = 0;
READ_sda();
/********** CHANGE *************/
for(j = 0 ; j < 17 ; j++)
{
if(j!=8)
{
nop();nop();nop();nop();
SCK = 1;
in_byte = rl(in_byte);
in_byte.0 = SDA;
SCK = 0;
}
else
{
WRITE_sda();
SDA = 0;
nop();
SCK = 1; //clk #9 for acknowledge
nop();nop();nop();
SCK = 0;
READ_sda();
}
}
/******** END CHANGE ***********/
return(in_byte);
}
//Low-level system routines
//General short delay
void delay_ms(uns16 x)
{
//Clocks out at 1006us per 1ms
uns8 y, z;
for ( ; x > 0 ; x--)
for ( y = 0 ; y < 4 ; y++)
for ( z = 0 ; z < 69 ; z++);
}
//Sends nate to the Transmit Register
void putc(uns8 nate)
{
while(TXIF == 0);
TXREG = nate;
}
uns8 getc(void)
{
while(RCIF == 0);
return (RCREG);
}
uns8 scanc(void)
{
uns16 counter = 0;
//CREN = 0;
//CREN = 1;
RCIF = 0;
while(RCIF == 0)
{
counter++;
if(counter == 1000) return 0;
}
return (RCREG);
}
//Returns ASCII Decimal and Hex values
uns8 bin2Hex(char x)
{
skip(x);
#pragma return[16] = "0123456789ABCDEF"
}
//Prints a string including variables
void printf(const char *nate, int16 my_byte)
{
uns8 i, k, m, temp;
uns8 high_byte = 0, low_byte = 0;
uns8 y, z;
uns8 decimal_output[5];
for(i = 0 ; ; i++)
{
//delay_ms(3);
k = nate[i];
if (k == '\0')
break;
else if (k == '%') //Print var
{
i++;
k = nate[i];
if (k == '\0')
break;
else if (k == '\\') //Print special characters
{
i++;
k = nate[i];
putc(k);
} //End Special Characters
else if (k == 'b') //Print Binary
{
for( m = 0 ; m < 8 ; m++ )
{
if (my_byte.7 == 1) putc('1');
if (my_byte.7 == 0) putc('0');
if (m == 3) putc(' ');
my_byte = my_byte << 1;
}
} //End Binary
else if (k == 'd') //Print Decimal
{
//Print negative sign and take 2's compliment
if(my_byte < 0)
{
putc('-');
my_byte *= -1;
}
if (my_byte == 0)
putc('0');
else
{
//Divide number by a series of 10s
for(m = 4 ; my_byte > 0 ; m--)
{
temp = my_byte % (uns16)10;
decimal_output[m] = temp;
my_byte = my_byte / (uns16)10;
}
for(m++ ; m < 5 ; m++)
putc(bin2Hex(decimal_output[m]));
}
} //End Decimal
else if (k == 'h') //Print Hex
{
//New trick 3-15-04
putc('0');
putc('x');
if(my_byte > 0x00FF)
{
putc(bin2Hex(my_byte.high8 >> 4));
putc(bin2Hex(my_byte.high8 & 0b.0000.1111));
}
putc(bin2Hex(my_byte.low8 >> 4));
putc(bin2Hex(my_byte.low8 & 0b.0000.1111));
} //End Hex
else if (k == 'f') //Print Float
{
putc('!');
} //End Float
else if (k == 'u') //Print Direct Character
{
//All ascii characters below 20 are special and screwy characters
//if(my_byte > 20)
putc(my_byte);
} //End Direct
} //End Special Chars
else
putc(k);
}
} |
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