Help with printf/puts conversion

[baseball07]

Hello I am interfacing my PIC16F874a microchip to a SP03 text to speech module (http://www.robotstorehk.com/SP03Tech.pdf), and I wrote my code using printf to output the commands to the chip. I have two problems: 1) it is not working, and 2) I would like to re-write it using "puts" to save code space on my PIC. I beleive I am calling my USART function correctly and my rs232 circuit it correct, so I beleive it is an error in my code. I also do not know how to use any type of "put" function ( I am just starting with C), so I was wondering if I can get help and suggestions on how to do this. I basically just have to output starting commands, then the ASCII I need to send, followed by 2 more commands. Thank you.

#include <pic.h>
#include <stdio.h>
#include "delay.h"
#include "usart.h"

void speech(char c)
{
	int cnum;
	cnum=c;
	printf("%c", cnum);
	DelayMs(1);
}

void Writespeech(const char* s)
{
	while(*s)
	speech(*s++);

}

main()
{
	int i;
	

			INTCON=0;	// purpose of disabling the interrupts.
	
			init_comms();	// set up the USART - settings defined in usart.h
			
			printf("%c",0x80);
			DelayMs(1);
			printf("%c",0x00);
			DelayMs(1);
			printf("%c",0x04);
			DelayMs(1);
			printf("%c",0x02);
			DelayMs(1);
			
			Writespeech("How are You");
			DelayMs(1);

	                                printf("%c",0x1A);
			DelayMs(1);
			printf("%c",0x00);
			DelayMs(1);
			for(i=0;i<=35;i++)
				{
				DelayMs(200);
				}
For(;;);
}

[quzah]

Where exactly did you get the idea that puts, which you don't know how to use, is going to save space?


Quzah.

[Dave_Sinkula]

The development system on which you are working is most likely the most reliable source of information on how to use it.

This question is not necessarily a C question, per se, but rather one of the system in which it is implemented.

[baseball07]

Because printf on a microchip eats up more program memory I was told. I figured this was more of a C syntax question than anything else. I will turn to other forums if no one can help. Thanks anyway!

[Dave_Sinkula]

Because printf on a microchip eats up more program memory I was told.

And so would sprintf (followed by puts).

I figured this was more of a C syntax question than anything else.

Try puts with a basic test, such as puts("hello world"); -- if it has the same issues, it will save you little to micromanage it in this fashion. That may mean writing your own replacements, but that is a different sort of question.

[dwks]

printf() is indeed rather inefficient if you're just printing a single character or a string. You could use putchar() or puts() if you can. Instead of "%c", you could use putchar():

printf("%c",0x80);

->

putchar(0x80);

And instead of

printf("%s\n", str);

(note the \n!) you could use

puts(str);

BTW, C is case-sensitive.

For(;;);

[edit] Eight whole minutes too slow . . . who ever invented tabbed browsing anyway? [/edit]