/*
 * discussion6.c
 *
 * Created: 10/2/2013 11:51:05 AM
 *  Author: Becca
 * Additional Code from : Dr. Robucci and websites listed below
 */ 


/*
* Instructions:
*	1. Read through the following code and take note of the difference between lcd_puts_P and lcd_puts
*	2. Build (don't run or debug) the code using the function lcd_puts
*	3. Note the Program Memory Usage and Data Memory Usage in the build output
*	4. Change the code to call lcd_puts_P instead of lcd_puts using the same string (simply uncomment lcd_puts_P in main and comment lcd_puts)
*	5. Note the Program Memory Usage and Data Memory Usage in the build output
*	6. What changes happened and why?
*	7. Play around with creating strings stored in program memories
*
*/


#define F_CPU 8000000
#include <avr/pgmspace.h>
#include "U0_LCD_Driver.h"

void lcd_puts_P(const char  c[]) { //same const char *c
	uint8_t ch = pgm_read_byte(c);
	int location = 0;
	while(ch != 0) {
		LCD_WriteDigit(ch, location);
		ch = pgm_read_byte(++c);
		location ++;
	}
}

void lcd_puts(const char  c[]) { //same const char *c
	uint8_t ch = *c;
	int location = 0;
	while(ch != 0) {
		LCD_WriteDigit(ch, location);
		ch = *(++c);
		location ++;
	}
}



int main(void)
{
	LCD_Init();
	
	//lcd_puts_P(PSTR("Hey"));
	lcd_puts("Hey");
	

	// Or:
	//const char SOME_STRING[] PROGMEM = "Hey";
	//lcd_puts_P(SOME_STRING);
}


/*
* Ideas to reduce your memory usage:
*   1. shorten your prompts (or reuse parts of strings)
*   2. don't have multiple temp string variables in memory at once
*
* Also, you can have gcc optimize for space, rather than for performance.
*	--> Project properties -> toolchain -> optimization -> optimize for space.
*
* http://pastebin.com/ZFutipXs
* http://www.nongnu.org/avr-libc/user-manual/mem_sections.html
*
*/