test_i2c.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*--------------------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*--------------------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*--------------------------------------------------------------------------------------
//* File Name           : test_i2c.c
//* Object              : Software I2C 
//*
//* 1.0 29/05/00  EL    : Creation
//* 2.0 08/09/00  EL    : Clean up
//* 2.1 14/01/02  PFi   : Clean up and conditional complilation flags for all boards
//* 2.2 04/02/02  PFi   : New version of I2C test
//*--------------------------------------------------------------------------------------
//* EB40A Jumper CB13/14 must be closed
//* EB42 Jumper CB13/14 must be closed
//* EB55 Jumper CB13/14 must be closed
//* EB63 Jumper E13 : 1-2-3 must be connected !

#include     <stdio.h>
#include    "drivers/lib_i2c/lib_i2c.h"
#include    "at24c512.h"
#include    "periph/stdc/std_c.h"


//* Include files for EB40A
#ifdef AT91R40008
#include    "targets/eb40a/eb40a.h"
#include    "parts/r40008/lib_r40008.h"

#define		TARGET		"EB40A"

#endif //AT91R40008

//* Include files for EB42
#ifdef AT91M42800
#include    "targets/eb42/eb42.h"
#include    "parts/m42800/lib_m42800.h"

#define     PIO_DESC    PIOB_DESC
#define		TARGET		"EB42"

#endif //AT91M42800

//* Include files for EB55
#ifdef AT91M55800
#include    "targets/eb55/eb55.h"
#include    "parts/m55800/lib_m55800.h"

#define     PIO_DESC    PIOA_DESC
#define		TARGET		"EB55"

#endif //AT91M55800

//* Include files for EB63
#ifdef AT91M63200
#include    "targets/eb63/eb63.h"
#include    "parts/m63200/lib_m63200.h"

#define     PIO_DESC    PIOA_DESC
#define		TARGET		"EB63"

#endif //AT91M63200



u_char txBuffer[AT24C512_PAGE_LENGTH];
u_char rxBuffer[AT24C512_PAGE_LENGTH];


//*--------------------------------------------------------------------------------------
//* Function Name       : main
//* Object              : Main function of test I2C
//* Input Parameters    : none
//* Output Parameters   : True
//*--------------------------------------------------------------------------------------
int main(void)
{
    u_int i ;
    u_short eeprom_address = 0x0 ;
    u_int	com_speed =	5000 ;
    u_int i2c_speed = ((MCK/4)/com_speed) ;         // Communication speed is set to 5KHz
	u_int error = 0 ;
	
    printf("--- %s SOFTWARE I2C TEST ---\n", TARGET);

    // Open the communication with the two-wire EEPROM
    at24_Init( &PIO_DESC, i2c_speed, SDA, SCL ) ;

    printf("I2C EEPROM : AT24C512\n");
    printf("SPEED Communication set @ %dKHz with %s running @ %dMHz\n", com_speed/1000, TARGET, MCKKHz/1000);
    

    // Initialization of the buffer to transmit
    for (i=0; i <=AT24C512_PAGE_LENGTH; i++ )
    {
        txBuffer[i]=i;
    }

    // We wait for any previous transfert to end
    at24_TransfertEnd();

    printf("WRITING %d octets from address %d of the EEPROM\n",AT24C512_PAGE_LENGTH, eeprom_address);

    // We write the txBuffer in the EEPROM at address 0
    at24_Write(eeprom_address, txBuffer, AT24C512_PAGE_LENGTH, MCK ) ;

    // We wait for any previous transfert to end
    at24_TransfertEnd();

    // The buffer we wrote is reading back from EEPROM, and stored in rxBuffer
    at24_Read( eeprom_address, rxBuffer, AT24C512_PAGE_LENGTH ) ;

    printf("READING %d octets from address %d of the EEPROM\n",AT24C512_PAGE_LENGTH, eeprom_address);


    // Checking
    for ( i=0 ; i < AT24C512_PAGE_LENGTH ; i++)
    {
        if ( rxBuffer[i] != txBuffer[i])
        {
           printf("Error @ address %d / Data written : 0x%02x / Data read : 0x%02x \n",i, txBuffer[i], rxBuffer[i]);
           error++;
        }
    }

	if ( error == 0 )
	{
	    printf("%d octets written and verified\n", AT24C512_PAGE_LENGTH);
    	printf("TEST EEPROM OK\n");
	}
	
	else
    	printf("TEST EEPROM FAIL\n");

    at24_TransfertEnd();

    while(1);
}