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[SOLVED] [MOVED] Mikro C UART1 TEMPERATURE VALUES

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KiuFelix

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Hi all,
I am new in mikro-c compiler. I am trying to read temperature values and pass it to rs232 for logging. In my code, I am able to do so through UART1_WRITE() or even UART1_WRITE_TEXT(). I can out-put text well through UART1_WRITE_TEXT() though. Like UART1_WRITE_TEXT("test"). Data sent is test.Successful in this case. But passing values like UART1_WRITE_TEXT(12) or UART1_WRITE(12) I get pointer errors. How do one concatenate values in this case? Somebody help.Here is my code.

Code: 
unsigned int t;
float temp;
void main(){
ADCON1 = 0x00;// Set all PORTA pins as analog
TRISA = 0xFF; // PORTA is input
TRISB = 0x00; // PORTB is output
PORTA=0; //clear PORTA
PORTB=0; //clear PORTB
PORTC=0; //clear PORTC
UART1_Init(9600);
Delay_ms(100);

while(1) {
    PORTB=0; //clear PORTB
    PORTC=0; //clear PORTC
    t=ADC_Read(0);
    Delay_ms(100);
    temp=(t*500)/1023;
    delay_us(100);
    UART1_Write_Text(temp);                                //Output temperature values
    delay_us(100);
         if(temp>35){
              PORTB.RB0=1;
              UART1_Write_Text("_H");
              }
         else if(temp<10)
         {
              PORTB.RB0=0;
              UART1_Write_Text("_L");
         }
         else
               {
                PORTB.RB0=0;
                UART1_Write_Text("_N");

               }
               Delay_ms(400);
}
}

Kindly Locate
Code: 
 UART1_Write_Text(temp);  //Output temperature values
That is the area of interest.
Expected output is something like 20_N21_N22_N for normal temperature for example. 22,21 etc are the calculated temperature values.
Thanks in advance.
 

You need to convert the value into a string.
If your variable was an integer, you could use sprintf.

char buffer[24];

sprintf(buffer, "Temperature is %d", value);
UART1_Write_Text(buffer);

But your value is a float. I doubt if mikro-c supports full printf formatting?

You will have to write a function to convert it to a string.

Do you need to use a float?

unsigned int temp; /* will it overflow? */

temp = (t * 500) / 1024; /* 1024 not 1023? */
 
Last edited:

hello,

- add Conversions library in your project to use float conversion to string
- declare a buffer ( ex: text)
- cast your "t" reading ADC from 16bits to float.
- Use decimal in your floating fix value to be sure to work with float (not integer) ,
it is a good rule to avoid mistake or to clarifie your code.


UART1_WRITE(12) I get pointer errors.
Click to expand...

I allready uses direct code invoice on uart with this function without problems.
example :
UART1_Write(9); // (9=Tabulation) to separate the value
don't use UART1_Write_Text(9); for that !
i also uses
UART1_Write(12); to erase the page on terminal Vbray at starting program (like CLS in screen)

and try this:
Code: 
// include in library   Conversions


unsigned int t;
float temp;
char text[15];		// add a buffer for float conversion



void main(){
ADCON1 = 0x00;// Set all PORTA pins as analog
TRISA = 0xFF; // PORTA is input
TRISB = 0x00; // PORTB is output
PORTA=0; //clear PORTA
PORTB=0; //clear PORTB
PORTC=0; //clear PORTC
UART1_Init(9600);
Delay_ms(100);

while(1) {
    PORTB=0; //clear PORTB
    PORTC=0; //clear PORTC
    t=ADC_Read(0);
    Delay_ms(100);
    temp=(float)t*500.0/1023.0;
    delay_us(100);
    FloatToStr(temp, text); 	// fill the buffer
    UART1_Write_Text(text);   //Output temperature values
    delay_us(100);
         if(temp>35){
              PORTB.RB0=1;
              UART1_Write_Text("_H");
              }
         else if(temp<10)
         {
              PORTB.RB0=0;
              UART1_Write_Text("_L");
         }
         else
               {
                PORTB.RB0=0;
                UART1_Write_Text("_N");

               }
               Delay_ms(400);
}
 
Hi btbass,
Thanks for your contribution. I think the srprintf() works only in native C. In mikroc most of this functions have been changed and assigned different names/identifications. Not like in CCS C compiler which is almost similar to native C.
The temp calculation I think I am right. I get a good simulation value in Protuse. I considered 0-1023 for 0=0v and 5 to 1023. I am still going to take a deep look on that though.
Thanks

---------- Post added at 13:22 ---------- Previous post was at 13:20 ----------

Hey paulfjujo,
Thanks for the assistance. Your code works like a charm. This is exactly what I wanted. Your explanation is good to. I have gained something from it. Thanks again.
 

10 bits is actually 1024 values. 0 is a value.

0-1023 is 1024 different values.
 

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