AN2511 datasheet(22/43 Pages) STMICROELECTRONICS

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PMBus commands and source code

AN2511

22/43

Doc ID 13286 Rev 2

3.3

Example

This section explains how to use the PMBus driver. An example operation of write/ read

commands are shown.

/*****************************************************************************

Source File Name : Main.c

Group

: IMS Systems Lab

Author

: Telecom Team

Date First Issued: 01/09/2006

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

THE SOFTWARE INCLUDED IN THIS FILE IS FOR GUIDANCE ONLY. STMicroelectronics

SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL

DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM USE OF THIS SOFTWARE.

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

********************************Documentation**********************************

General Purpose - Contains main source code. In this file, the PMBus command files

are written.

******************************************************************************/

#include "ST7_config.h"

/* Fcpu defined as 8MHz */

#include "main.h"

/* Contains the global variables used in main.c */

#include "ST7_hr.h"

/* Contains the register and flags for ST7 */

extern volatile unsigned int SMB_TimeCount;

/* Time count variable */

#pragma space extern [] @tiny

/* To force following variables into short

addressing memory */

extern unsigned char Data_Buff [32] ;

/* Buffer to store data */

/* Variables to differentiate the different SMBus transaction types */

extern volatile unsigned char SMBus_Mode ;

extern volatile unsigned char SMB_Err_Status ;

/* Error status */

/* Master to address slave with this

address */

static volatile unsigned char PMBus_SlaveAdd = 0x80;

/* Master to address slave with this

address */

static volatile unsigned char PMBus_SlaveAdd = 0x80;

/*-----------------------------------------------------------------------------

ROUTINE NAME : Main

INPUT

: None

OUTPUT

: None

DESCRIPTION

: Using this file, user can write/ read PMBus commands.

COMMENTS

: Programs jumpts into this routine when microcontroller is reset

-----------------------------------------------------------------------------*/

void main()

{

unsigned char temp ;

SMBs_Address_t PMBus_Err ;

/* To check errors in PMBus communication */

/*----------------------- Port A configuration ----------------------------*/

PADDR &= (unsigned char)~PORTA_DEFAULT;

PADDR = PORTA_DEFAULT ;

/* Other pins configured as floating input */

PAOR = (unsigned char)(PORTA_DEFAULT) ;

/*----------------------- Port C configuration ----------------------------*/

PCDDR = CONTROL ;

/* PC0 floating input, others push pull output */

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