fix endless loop (#782)

[proxmark3-svn] / armsrc / i2c.c

//-----------------------------------------------------------------------------
// Willok, June 2018
// Edits by Iceman, July 2018
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// The main i2c code, for communications with smart card module
//-----------------------------------------------------------------------------

#include "i2c.h"

#include <stdint.h>
#include <stdbool.h>
#include "string.h"  //for memset memcmp
#include "proxmark3.h"
#include "mifareutil.h" // for MF_DBGLEVEL
#include "BigBuf.h"
#include "apps.h"

#ifdef WITH_SMARTCARD
#include "smartcard.h"
#endif


#define GPIO_RST  AT91C_PIO_PA1
#define GPIO_SCL  AT91C_PIO_PA5
#define GPIO_SDA  AT91C_PIO_PA7

#define SCL_H   HIGH(GPIO_SCL)
#define SCL_L   LOW(GPIO_SCL)
#define SDA_H   HIGH(GPIO_SDA)
#define SDA_L   LOW(GPIO_SDA)

#define SCL_read  (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SCL)
#define SDA_read  (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SDA)

#define I2C_ERROR  "I2C_WaitAck Error" 

static volatile unsigned long c;