how to send ADC data to USART??

[Cheetos]

how do i send my data from ADC to Usart? This is my code, and i am not able to send the data that i need. I am not that good in programming microcontrollers. i am currently using PIC16F877A and MikroC



void main(){

ADCON1 = 0x00; // 8-bit converter, 0000 Ports E and A are analog inputs and Vref+ is VDD Vref- is Vss,
TRISA = 0xFF; // Port A input
PORTB = 0x00;
TRISB = 0x00;
TRISC = 0xC0; // only TX pin is made output on port C
TRISD = 0x00;
Usart_Init(9600);
PORTB = 0xFF;
delay_ms(1000);
PORTB = 0x00;
while(1){

Vout=Adc_read(0);

Usart_Write('C');
Usart_Write('U');
Usart_Write('R');
Usart_Write('R');
Usart_Write('E');
Usart_Write('N');
Usart_Write('T');
Usart_Write('\r');
Usart_Write(Adc_read(0));

}


}

 

[bigdogguru]

how do i send my data from ADC to Usart?

You need to first convert the numerical ADC value into a character string. Then transmit the character string representing the ADC value via serial.

BigDog

 

[Cheetos]

i'm having trouble converting the ADC value to character string, how do i convert it? i used InttoStr(myvalue ,stringvalue ) still i get the wrong data

 

[bigdogguru]

Using the sprint library, would most likely be the easiest, but not the most efficient, method of converting an integer to character array/buffer.

Reference MikroC Pro User Manual, pg 596 & 600 , Section SPRINT LIBRARY

The library code example on pg 600 demonstration the conversion along with transmission using the UART:

double ww = -1.2587538e+1;
char buffer[15];

// Function for sending string to UART
void UartWriteText(char *txt) 
{
       while(*txt)
       UART1_Write(*txt++);
}

// Function for sending const string to UART
void UartWriteConstText(const char *txt) 
{
       while(*txt)
       UART1_Write(*txt++);
}

void main()
{
      UART1_Init(4800); // Initialize UART module at 4800 bps
      Delay_ms(10);
   
      UartWriteConstText("Floating point number representation"); //Write message on UART
      sprintf(buffer, "%12e", ww); // Format ww and store it to buffer
      UartWriteConstText("\r\ne format:"); // Write message on UART
      UartWriteText(buffer); // Write buffer on UART
      sprintf(buffer, "%12f", ww); // Format ww and store it to buffer
      UartWriteConstText("\r\nf format:"); // Write message on UART
      UartWriteText(buffer); // Write buffer on UART
      sprintf(buffer, "%12g", ww); // Format ww and store it to buffer
      UartWriteConstText("\r\ng format:"); // Write message on UART
      UartWriteText(buffer); // Write buffer on UART

     while(1);
}

You could use the sprinti() form of the library function and save some flash memory.


BigDog

 

[Cheetos]

is this applicable for Usart_write? hmm i need to transmit it at the TX pin of my microcontroller

 

[bigdogguru]

is this applicable for Usart_write? hmm i need to transmit it at the TX pin of my microcontroller

The meaning of your question is not clear. Can you elaborate?

The ADC value is a integer, so the sprintf() conversion will be slightly different, you need to use "%d" instead of "%f" or "%g".

BigDog

 

[Cheetos]

sorry about that, my ADC value will be integer, and i want it to be converted to a string, otherwise, my receiving node will display a character corresponding to the hex equivalent of the ADC integer. i see that the code you gave me is for UART_write, but i am currently using USART_write(), i am using the RX and TX pin of my microcontroller.

 

[bigdogguru]

Actually I see very little discussed in the user's manual concerning USART_write(). Try it and see. Both routines use the devices USART and TX/RX pins.

BigDog

 

[Cheetos]

ok, i think my question is wrong :???: may should have asked how to convert int to string for Usart_write() transmission.

 

[Cheetos]

Actually I see very little discussed in the user's manual concerning USART_write(). Try it and see. Both routines use the devices USART and TX/RX pins.

BigDog

I was able to search for a code that can transmit what i want, but the problem is when i tested it, it only transmits 1 decimal place, i would like it to transmit two decimal places, how can i do it?

This is my

ad_value = Adc_Read(0);
Vin = adc_value*(5.00000/1023.00000);
d1=((Vin%1)*100)/100;
d2=((d1%1)*10);
inter= Vin;
deci = d1;
deci2= d2;
usart_write(inter +0x30);
delay_ms(50);
usart_write('.');
delay_ms(50);
usart_write(deci + 0x30);
delay_ms(50);
usart_write(deci2 +0x30;
delay_ms(5000)
usart_write(13);
usart_write(10);

 

[engshahrul]

Try this my UART function

void uart_transmit(char data){
while(TXIF==0) continue;
TXREG=data;
}

void uart_string(const char *s)
{
while(*s)
uart_transmit(*s++);
}

void uart_number(unsigned int no, char base, char digit)
{char i,di[10];
for(i=0;i<=9;i++) di[i]=0;
i=0;
do{
	di[i]=no%base;
	no=no/base;
	i++;}
while(no!=0);
for(i=digit;i>0;i--){
	if(di[i-1]<=9) uart_transmit(di[i-1]+'0');
	else uart_transmit(di[i-1]-10+'A');}
}

---------- Post added at 04:02 ---------- Previous post was at 03:55 ----------

I was able to search for a code that can transmit what i want, but the problem is when i tested it, it only transmits 1 decimal place, i would like it to transmit two decimal places, how can i do it?

This is my

ad_value = Adc_Read(0);
Vin = adc_value*(5.00000/1023.00000);

Vin maximum will be 5, so it always 1 digit values. You should multiply with 5000 instead of 5.