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choosujin
Joined: 24 Aug 2010
Posts: 3
Location: south korea, incheon,
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| I need help!! (i2c, picdem 2 board) |
 Posted: Tue Aug 24, 2010 8:17 pm |
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Sorry, i'm not english native.
I need help!!
this is my code to operate termperature sensor!!
It does not work!! T^T
Help me!! what is going on my code?
I think, is it i2c setting wrong?
Result is 0xff...always,...help!!  
I used PICDEM 2 PLUS board, PIC16F877A ,ccs-c, mplab 7.31
| Code: |
#include <16F877A.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP,nocpd,nolvp
#use delay(clock = 4000000)
#include "flex_lcd.c"
#use i2c(master,sda=PIN_C4,scl=PIN_C3,FAST)
int8 temp;
void lcd_out(int8 j);
//void ch();
void main()
{
unsigned char cmd_byte=1;
//int i;
lcd_init(); //lcd init
i2c_start();
i2c_write(0X9A);
i2c_write(cmd_byte);
i2c_start(); //restart.
i2c_write(0X9B);
//i2c_write(0);
i2c_stop();
lcd_out(temp);
}
void lcd_out(int8 j)
{
lcd_init();
lcd_gotoxy(1,1);
lcd_putc("Temperature!!\n");
lcd_gotoxy(1,2);
printf(lcd_putc, "temp: %u(Degree)", j );
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Aug 24, 2010 8:53 pm |
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Download the TC74 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/21462c.pdf
Look on page 8, in this section:
| Quote: | TABLE 4-1: COMMAND BYTE
DESCRIPTION |
What command byte should you send to read the temperature ?
What are sending ? Look at your code. |
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choosujin
Joined: 24 Aug 2010
Posts: 3
Location: south korea, incheon,
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| THANK YOU!! THANK YOU!! |
| Posted: Tue Aug 24, 2010 11:24 pm |
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THANK YOU!! THANK YOU!! THANK YOU!! 
It does work!!!  |
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