Author Topic: I2C routines for PIC Microcontroller (Read 8922 times)

marcelino · « **Reply #40 on:** October 16, 2009, 05:54:42 PM »

patanong...

to be exact sir, ano yung delay.h? nagstruggle ako gumawa ng sariling ds1307 driver. guided na din naman gawa nung driver sa CCSinfo.

parang mas gusto ko to kasi software i2c to di ba?

Philippine Electronics Forum · « **Reply #40 on:** October 16, 2009, 05:54:42 PM »

Kaizer03 · « **Reply #41 on:** October 16, 2009, 05:57:23 PM »

thanks dito...point for you tita.=)

Philippine Electronics Forum · « **Reply #41 on:** October 16, 2009, 05:57:23 PM »

zer0w1ng · « **Reply #42 on:** October 16, 2009, 07:14:54 PM »

Quote from: marcelino on October 16, 2009, 05:54:42 PM

patanong...

to be exact sir, ano yung delay.h? nagstruggle ako gumawa ng sariling ds1307 driver. guided na din naman gawa nung driver sa CCSinfo.

parang mas gusto ko to kasi software i2c to di ba?

delay.h and together delay.c are included in the hitech compiler standard lib.
This includes polled microsecond and millisecond delays but not so accurate.

Yes this is I2C.

Philippine Electronics Forum · « **Reply #42 on:** October 16, 2009, 07:14:54 PM »

marcelino · « **Reply #43 on:** October 16, 2009, 07:20:49 PM »

eto po ba yun?

delay.c

Code: [Select]

/*
 *	Delay functions
 *	See delay.h for details
 *
 *	Make sure this code is compiled with full optimization!!!
 */

#include	"delay.h"

void
DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	i;
	do {
		i = 4;
		do {
			DelayUs(250);
		} while(--i);
	} while(--cnt);
#endif
}

delay.h

Code: [Select]

/*
 *	Delay functions for HI-TECH C on the PIC
 *
 *	Functions available:
 *		DelayUs(x)	Delay specified number of microseconds
 *		DelayMs(x)	Delay specified number of milliseconds
 *
 *	Note that there are range limits: x must not exceed 255 - for xtal
 *	frequencies > 12MHz the range for DelayUs is even smaller.
 *	To use DelayUs it is only necessary to include this file; to use
 *	DelayMs you must include delay.c in your project.
 *
 */

/*	Set the crystal frequency in the CPP predefined symbols list in
	HPDPIC, or on the PICC commmand line, e.g.
	picc -DXTAL_FREQ=4MHZ
	
	or
	picc -DXTAL_FREQ=100KHZ
	
	Note that this is the crystal frequency, the CPU clock is
	divided by 4.

 *	MAKE SURE this code is compiled with full optimization!!!
	
 */

#ifndef	XTAL_FREQ
#define	XTAL_FREQ	4MHZ		/* Crystal frequency in MHz */
#endif

#define	MHZ	*1000L			/* number of kHz in a MHz */
#define	KHZ	*1			/* number of kHz in a kHz */

#if	XTAL_FREQ >= 12MHZ

#define	DelayUs(x)	{ unsigned char _dcnt; \
			  _dcnt = (x)*((XTAL_FREQ)/(12MHZ)); \
			  while(--_dcnt != 0) \
				  continue; }
#else

#define	DelayUs(x)	{ unsigned char _dcnt; \
			  _dcnt = (x)/((12MHZ)/(XTAL_FREQ))|1; \
			  while(--_dcnt != 0) \
				  continue; }
#endif

extern void DelayMs(unsigned char);

i searched over the folder of hitech c installation, yan lang po ang lumabas. the other delay was promoting the usage of __delay_ms() and __delay_us().

Philippine Electronics Forum · « **Reply #43 on:** October 16, 2009, 07:20:49 PM »

marcelino · « **Reply #44 on:** October 16, 2009, 09:09:09 PM »

ano naman yung io.h? dami kong tanong... heheh

Philippine Electronics Forum · « **Reply #44 on:** October 16, 2009, 09:09:09 PM »

zer0w1ng · « **Reply #45 on:** October 17, 2009, 08:20:15 AM »

Quote from: marcelino on October 16, 2009, 09:09:09 PM

ano naman yung io.h? dami kong tanong... heheh

Ok lang.

Sir, ito yung definition ng IO na ginagamit sa I2C.

On the top part sa source code naka-comment ito:

Code: [Select]

//define the following externally on io.h file
/*
 //port pin assignment
 #define SCL             RA5
 #define SCL_TRIS        TRISA5
 #define SDA             RA4
 #define SDA_TRIS        TRISA4
*/

Ito yung laman ng io.h or any ther io definitions sa overall program.
This is a modular concept sa programming para hindi ako malito.
Pwede ring tangalin ang io.h and copy/paste the code inside the .c file.

marcelino · « **Reply #46 on:** October 17, 2009, 10:42:44 AM »

Quote from: zer0w1ng on October 17, 2009, 08:20:15 AM

Ok lang.

Sir, ito yung definition ng IO na ginagamit sa I2C.

On the top part sa source code naka-comment ito:
Code: [Select]
//define the following externally on io.h file /* //port pin assignment #define SCL RA5 #define SCL_TRIS TRISA5 #define SDA RA4 #define SDA_TRIS TRISA4 */
Ito yung laman ng io.h or any ther io definitions sa overall program.
This is a modular concept sa programming para hindi ako malito.
Pwede ring tangalin ang io.h and copy/paste the code inside the .c file.

yes sir, right after ko magpost ng tanong, naintindihan ko na din naman...

thanks

bryanwizard · « **Reply #47 on:** October 06, 2010, 10:15:41 PM »

wow gandang thread po ito. Gusto ko din matuto ng PIC.

ELAN, SONIX, ST lang alam ko.

salamat po master zerowing

believeitornot · « **Reply #48 on:** July 23, 2012, 10:14:40 PM »

sir,gud day po.
magtatanong lng po aq if ano pede Enhancement ang pede kong gawin sa pic Microcontroller?my nabasa po aq n lecture note n 3 po ung pede gawing enhancement....processor,memory at peripherals....alin po ba ang astig gawin?at alin po ba ang posible gawin..need ko po ng reply nyo..salamat po

believeitornot · « **Reply #49 on:** February 05, 2013, 02:42:11 PM »

mga sir,

cno po may alam kung magcrack ng PIc mcu...

glutnix_neo · « **Reply #50 on:** February 05, 2013, 03:58:57 PM »

Quote from: edsbelieves on February 05, 2013, 02:42:11 PM

mga sir,

cno po may alam kung magcrack ng PIc mcu...

Off topic ka boy, gawa ka sariling thread then dun natin pagusapan yan....

Philippine Electronics Forum · « **Reply #50 on:** February 05, 2013, 03:58:57 PM »

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