How to get addc value through uart

[NANDHAkumar]

I got adc value on LCD but i cannot get values through UART

Hitech c compiler

MPLAB IDE

 

 

#include "Includes.h"

 

// Configuration word for PIC16F877

__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON 

& LVP_OFF & CPD_OFF & WRT_ON & DEBUG_OFF);

 

#define AN7  7

 

#define BAUDRATE 9600  //bps

 

//unsigned char ch="ADC DATA ACQUISTION";

 

unsigned int result [11];

void InitADC(void)

{

ADCON1  = 0x80;     // Make PORTA and PORTE analog pins

// Also, Vref+ = 5v and Vref- = GND

TRISA   = 0x2f;      // Make RA5, RA3, RA2, RA1, RA0 input

TRISE   = 0x07; // Make RE0, RE1 and RE2 input

ADCON0  = 0x81; // Turn on the A/D Converter

}

 

 

 

void InitUART(void)

{

TRISC6 = 1;   // TX Pin

TRISC7 = 1;   // RX Pin

 

SPBRG = ((_XTAL_FREQ/16)/BAUDRATE) – 1;

BRGH  = 1;                   // Fast baudrate

SYNC  = 0; // Asynchronous

SPEN  = 1; // Enable serial port pins

CREN  = 1; // Enable reception

SREN  = 0; // No effect

TXIE  = 0; // Disable tx interrupts

RCIE  = 1; // Enable rx interrupts

TX9   = 0; // 8-bit transmission

RX9   = 0; // 8-bit reception

TXEN  = 0; // Reset transmitter      

TXEN  = 1; // Enable the transmitter

}

 

 

unsigned int GetADCValue(unsigned char Channel)

{

   ADCON0 &= 0xc7;         // Clear Channel selection bits

 

unsigned char temp = 0; 

//unsigned int num = 0; 

 

unsigned int num = 0; 

ADON=1;

ADCON0|=0b01000000;

while(ADCON0==0x11) // wait for the A/D conversion to finish 

result [10]= ADRESL & 0xff; // store the lower eight bits in their respective place in the results array 

temp = ADRESH & 0x03; // get the uppermost two bits 

 

 

}

 

 

void SendByteSerially(unsigned char byte)  // Writes a character to the serial port

{

while(!TXIF);  // wait for previous transmission to finish

TXREG = result [10];

while(!TXIF);

}

 

// Main Function

void main(void)

{

unsigned int ADC_value = 0;

unsigned int digit1, digit2, digit3, digit4;

 

InitADC(); // Initialize ADC

InitLCD(); // Initialize LCD

    InitUART();

//void SendByteSerially(unsigned char);

while(1)

{

ClearLCDScreen(); // Clear LCD screen

     GetADCValue(AN7); // Read ADC value from RE2(AN7) pin

 

        __delay_ms(1000);

        void SendByteSerially(unsigned char byte);

// ADC_value can have a value from 0 (0v) to 1023(5v) only.

// SO display 4 digits of ADC_value

digit1 = (unsigned int)(ADC_value/1000); // Calculate digit1 of ADC_value

digit2 = (unsigned int)((ADC_value – digit1*1000)/100); // Calculate digit2 of ADC_value

digit3 = (unsigned int)((ADC_value – (digit1*1000+digit2*100))/10); // Calculate digit3 of ADC_value

digit4 = (unsigned int)(ADC_value – (digit1*1000+digit2*100+digit3*10)); // Calculate digit4 of ADC_value

 

WriteDataToLCD(digit1+0x30); // Display digit1 of ADC_value on LCD

WriteDataToLCD(digit2+0x30); // Display digit2 of ADC_value on LCD

WriteDataToLCD(digit3+0x30); // Display digit3 of ADC_value on LCD

WriteDataToLCD(digit4+0x30); // Display digit4 of ADC_value on LCD

 

__delay_ms(1000); // Half second delay before next reading

}

}

 

 

 

 

 

 

 

 

[Ashutosh Bhatt]

may be the problem in baud rate. just check crystal frequency and com port setting

[Author]

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