TX_test program in PIC C - Electronic Circuits Projects Diagrams Free

flemmard · 29th September 2007, 08:11 AM

hi all,
The code below is not working...Can anyone advice on this.I'm using PIC16f877.

Code:

#include <pic1687x.h>
#include <pic.h>

// Transmitter test program


void main() {
    TRISC = 0x00 ; //portC as output
	SPBRG = 129;	// Set the baud rate to 9.6k
	BRGH = 1;		// Set high baud rate 
	SYNC = 0;		// Set asynchronous 
	SPEN = 1;		// Enable serial port pins 
	SREN=0;	         
	TX9 = 0;		// Disable 9 bit transmission 
	TXIE = 0;		// Disable tx interrupts 
	RCIE = 0;		// Disable rx interrupts 
	TXEN  = 0;      //reset the transmitter
	TXEN = 1;		// Enable the transmitter

	while(1) {
	    TXEN  = 1;
		while(!TXIF) {	// Checks if the transmit flag is down 
			continue;
		}
		TXREG = 0b01010101;
	}
}

Thanks

Pommie · 29th September 2007, 02:12 PM

TX and RX have to be set to input for the UART to work. You should also write to TXREG and then wait for TXIF to be set.

Mike.

flemmard · 29th September 2007, 03:20 PM

Quote:

Originally Posted by Pommie

TX and RX have to be set to input for the UART to work. You should also write to TXREG and then wait for TXIF to be set.

Mike.

Hi, thanks for your reply ! Can you please send me your code if you have some sample?

Pommie · 29th September 2007, 03:28 PM

I only use asm on 16F pics but I would guess it would be something like,

Code:

#include <pic1687x.h>
#include <pic.h>

// Transmitter test program


void main() {
	TRISC = 0xc0 ; //portC as output
	SPBRG = 129;	// Set the baud rate to 9.6k
	BRGH = 1;		// Set high baud rate 
	SYNC = 0;		// Set asynchronous 
	SPEN = 1;		// Enable serial port pins 
	SREN=0;	         
	TX9 = 0;		// Disable 9 bit transmission 
	TXIE = 0;		// Disable tx interrupts 
	RCIE = 0;		// Disable rx interrupts 
	TXEN  = 0;      //reset the transmitter
	TXEN = 1;		// Enable the transmitter

	while(1) {
		TXEN  = 1;
		TXREG = 0b01010101;
		while(!TXIF); 	// Checks if the transmit flag is down 
	}
}

Mike.

donniedj · 29th September 2007, 04:56 PM

I am compiling a Problem-Issue Verses Effort-Issue report.

I will incorportate this example as an Effort-Issue.

flemmard · 30th September 2007, 07:32 AM

Quote:

Originally Posted by Pommie

I only use asm on 16F pics but I would guess it would be something like,

Code:

#include <pic1687x.h>
#include <pic.h>

// Transmitter test program


void main() {
	TRISC = 0xc0 ; //portC as output
	SPBRG = 129;	// Set the baud rate to 9.6k
	BRGH = 1;		// Set high baud rate 
	SYNC = 0;		// Set asynchronous 
	SPEN = 1;		// Enable serial port pins 
	SREN=0;	         
	TX9 = 0;		// Disable 9 bit transmission 
	TXIE = 0;		// Disable tx interrupts 
	RCIE = 0;		// Disable rx interrupts 
	TXEN  = 0;      //reset the transmitter
	TXEN = 1;		// Enable the transmitter

	while(1) {
		TXEN  = 1;
		TXREG = 0b01010101;
		while(!TXIF); 	// Checks if the transmit flag is down 
	}
}

Mike.

Hi , can you send me your asm code to to test my tx ?
I understand that i can add that asm code directly to my C for compilation
Thanks in advance

**Nigel Goodwin** · 30th September 2007, 12:21 PM

Quote:

Originally Posted by flemmard

Hi , can you send me your asm code to to test my tx ?
I understand that i can add that asm code directly to my C for compilation
Thanks in advance

You can check my RS232 PIC tutorial for assembler code.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
First Program in assembly, And Programmer Inchworm.	Ayne	Micro Controllers	10	9th March 2007 08:27 PM
program for writing and testing circuits	luca-deltodesco	General Electronics Chat	3	13th August 2006 11:17 AM
little help with my program please - simple count loop	kud0s	Micro Controllers	5	7th July 2005 10:40 PM
PicBasic Keypad program	Sora	Micro Controllers	0	20th April 2004 08:02 PM
Program Verify on JMD with ic-prog	monkeyxp	Micro Controllers	2	2nd November 2003 12:56 PM

29th September 2007, 02:12 PM	(permalink)
Pommie	TX and RX have to be set to input for the UART to work. You should also write to TXREG and then wait for TXIF to be set. Mike.

29th September 2007, 04:56 PM	(permalink)
donniedj	I am compiling a Problem-Issue Verses Effort-Issue report. I will incorportate this example as an Effort-Issue.