// Programmer : Hemnath
// Compiler : CCS C compiler
// Controller : PIC18F2520
// Description : To print ADC value in PC(Hyperterminal) using USART
#include <18F2520.h> // change header
#include "f2520_regs.h" // In this header i have declared all the registers with their corresponding values.
#fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000) // 4Mhz
//======================================
#define spbrg_value 25 //for --> (4Mhz/(16*9600))-1
unsigned int16 low_byte,high_byte;
unsigned int16 full_value,i=0;
unsigned char data[] = "ADC Value is : ";
void usart_init();
void main()
{
TRISC = 0x00;
TRISA = 0b00100000; // RA5 -input, rest as output
ADCON0 = 0b00010000; // analog channel 4
ADCON1 = 0b00001010; // ref volt. VSS and VDD. AN4 to AN0 as analog
ADCON2 = 0b10111100;
ADON = 1;
usart_init();
PEIE = 1;
GIE = 1;
while(1)
{
delay_us(50);
GO = 1; // to start conversion
while(GO==1); // wait for bit to be cleared
low_byte = ADRESL;
high_byte = ADRESH;
full_value = ((high_byte<<8)|low_byte);
for(i=0;data[i]!='\0';i++)
{
TXREG = data[i];
while(TXIF==0);
delay_ms(10);
}
delay_ms(100);
TXREG = ((full_value/1000)+0x30);
while(TXIF==0);
delay_ms(10);
TXREG = (((full_value/100)%10)+0x30);
while(TXIF==0);
delay_ms(10);
TXREG = (((full_value/10)%10)+0x30);
while(TXIF==0);
delay_ms(10);
TXREG = (((full_value/1)%10)+0x30);
while(TXIF==0);
delay_ms(10);
TXREG = 0x0A; // new line ascii value
while(TXIF==0);
delay_ms(10);
TXREG = 0x0D; // carriage return // which is 1st position...used to reset a device's position to the beginning of a line of text.
while(TXIF==0);
delay_ms(1000);
}
}
void usart_init() // usart initialization
{
SPBRG = spbrg_value;
TXSTA = 0x26;
RCSTA = 0x80;
}
In CCS c compiler, if you are making use of registers for programming, first you have to define the registers as #byte. Then only it won't show errors.
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As you did in 1st program is correct. In C18 compiler, you don't have to define all the registers. But in CCS, it is must to define the registers before using in the program.
Also, i have to tell you,
you are using #use rs232 line in the program. CCS will take care of all the registers with this line you have mentioned. So you don't have to initialize usart registers. Directly you can use printf statement to display the value in the hyperterminal.
If you still want to make use of registers, edit the below program and make use of it. It reads the adc value and displays in the hyperterminal. It's a working program i have checked it in my case.
HTML:// Programmer : Hemnath // Compiler : CCS C compiler // Controller : PIC18F2520 // Description : To print ADC value in PC(Hyperterminal) using USART #include <18F2520.h> // change header #include "f2520_regs.h" // In this header i have declared all the registers with their corresponding values. #fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP #use delay(clock=4000000) // 4Mhz //====================================== #define spbrg_value 25 //for --> (4Mhz/(16*9600))-1 unsigned int16 low_byte,high_byte; unsigned int16 full_value,i=0; unsigned char data[] = "ADC Value is : "; void usart_init(); void main() { TRISC = 0x00; TRISA = 0b00100000; // RA5 -input, rest as output ADCON0 = 0b00010000; // analog channel 4 ADCON1 = 0b00001010; // ref volt. VSS and VDD. AN4 to AN0 as analog ADCON2 = 0b10111100; ADON = 1; usart_init(); PEIE = 1; GIE = 1; while(1) { delay_us(50); GO = 1; // to start conversion while(GO==1); // wait for bit to be cleared low_byte = ADRESL; high_byte = ADRESH; full_value = ((high_byte<<8)|low_byte); for(i=0;data[i]!='\0';i++) { TXREG = data[i]; while(TXIF==0); delay_ms(10); } delay_ms(100); TXREG = ((full_value/1000)+0x30); while(TXIF==0); delay_ms(10); TXREG = (((full_value/100)%10)+0x30); while(TXIF==0); delay_ms(10); TXREG = (((full_value/10)%10)+0x30); while(TXIF==0); delay_ms(10); TXREG = (((full_value/1)%10)+0x30); while(TXIF==0); delay_ms(10); TXREG = 0x0A; // new line ascii value while(TXIF==0); delay_ms(10); TXREG = 0x0D; // carriage return // which is 1st position...used to reset a device's position to the beginning of a line of text. while(TXIF==0); delay_ms(1000); } } void usart_init() // usart initialization { SPBRG = spbrg_value; TXSTA = 0x26; RCSTA = 0x80; }
PS EDIT and change for your case.
Best wishes
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In your case, you can't find this "f2520_regs.h" header file. So comment this line which is second line in the program. and after #use delay line which is 4th line,
declare #byte and #bit for the registers you are using in the program.
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See if this works. In Simulation it takes some time for pt100 value to get stabilized.
