How to use printf with Hi-Tech PIC C and 16F877?

[ikarakaya]

I am using Keil C to program 8051. I can use printf to send data to serial I/O. Can i use it with HI-TECH PIC C and 16F877 ? And how ?

Thanks

 

[cb30]

Yes ,You can but you must define primitive printf function "putch" or "putchar".

 

[CADDevil]

Or simply use a sprintf function and copy the string to UART.
Actually, this way can be better, because you only have one function for "print" a string to some device and you can choose (with one additional parameter) where will go the output (UART, LCD, SPI, I2C etc.)

 

[cancel]

hi ...

hi .. i tried this with avr .. i found that on elektroda ;0)

int putchar(int c)
{
if (c == '\n')
putchar('\r');
while(!(USR&32)); //wait while tx buffer empty
UDR = (char)c; //send char to uart register
return c;
}

after you overload original putchar with this all printf features would work.

regards

cancel

 

[Gomez]

Or simply use a sprintf function and copy the string to UART.
Actually, this way can be better, because you only have one function for "print" a string to some device and you can choose (with one additional parameter) where will go the output (UART, LCD, SPI, I2C etc.)

And printf need the new() function.
Better is sprintf with a static array and is possible a "const" format string (into flash).

Gomez

 

[btbass]

use this code

#include <pic.h>
#include <stdio.h>
#include <string.h>

//------ init uart

void InitUART(void)
{
SPBRG = 12; /* 19200bPS @ 4MHz */
BRGH = 1; /* High Speed Mode */
TXEN = 1; /* Enable Transmit */
SPEN = 1; /* Enable Serial Port */
}

//------ write char to uart

void putch(unsigned char byte)
{
while(!TRMT); /* Wait for TX Buffer Empty */
TXREG = byte;
}

and then just use normal printf.