FreeRTOS/Demo/CORTEX_A5_SAMA5D3x_Xplained_IAR/AtmelFiles/libchip_sama5d3x/source/fuse.c

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 *         ATMEL Microcontroller Software Support
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 * Copyright (c) 2011, Atmel Corporation
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/** \addtogroup fuse_module Working with FUSE
 * The Fuse driver provides the Interface for configuration the FUSE 
 * peripheral.
 *
 * For more accurate information, please look at the FUSE section of the
 * Datasheet.
 *
 * Related files :\n
 * \ref fuse.c\n
 * \ref fuse.h.\n
*/
/*@{*/
/*@}*/

/**
 * \file
 *
 * Implementation of FUSE controller.
 *
 */
/*------------------------------------------------------------------------------
 *         Headers
 *------------------------------------------------------------------------------*/
#include "chip.h"

/*------------------------------------------------------------------------------
 *         Exported functions
 *------------------------------------------------------------------------------*/

 /**
 * \brief Read fuse vlaue by given word position. 
 *
 * \param wordPosition  select the 32-bit word 0 to 9.
 */

uint32_t FUSE_Read (uint8_t wordPosition )
{
    uint32_t fuse;
    /* Enable peripheral clock. */
    PMC->PMC_PCER1 = (1 << (ID_FUSE - 32 ));
    /* Request read fuse */
    FUSE->FUSE_CR = FUSE_CR_RRQ | FUSE_CR_KEY_VALID;
    /* RS and WS bits of the Fuse Index register (FUSE_IR) must be at level one
    before issuing the read request */
    while (!((FUSE->FUSE_IR & (FUSE_IR_WS | FUSE_IR_RS)) == (FUSE_IR_WS | FUSE_IR_RS)));
    /* Read fuse values, The fuse states are automatically read on CORE startup and are available for reading in the
    SR_REG_NB Fuse Status (FUSE_SRx) registers. */
    fuse = FUSE->FUSE_SR[wordPosition];
    /* Disable peripheral clock.*/
    PMC->PMC_PCDR1 = (1 << (ID_FUSE -32 ));
    return fuse;
}

/**
 * \brief Program fuse vlaue by given word position. 
 *
 * \param data  word to be program.
 * \param wordPosition  select the 32-bit word 0 to 9.
 */

void FUSE_Write (uint32_t data, uint8_t wordPosition )
{
    /* Enable peripheral clock. */
    PMC->PMC_PCER1 = (1 << (ID_FUSE - 32 ));
    /* Select the word to write, using the SELW field of the Fuse_Index register (FUSE_IR). */
    FUSE->FUSE_IR = (FUSE_IR_WSEL(wordPosition));
    /* Write the word to program in the Fuse_Data register (FUSE_DR).*/
    FUSE->FUSE_DR = data;
    /* Check that RS and WS bits of the Fuse_Index register are at level one (no read and
    no write pending). */
    while (!((FUSE->FUSE_IR & (FUSE_IR_WS | FUSE_IR_RS)) == (FUSE_IR_WS | FUSE_IR_RS)));
    /* Write the WRQ bit of the Fuse_Control register (FUSE_CR) to begin the fuse programming. */
    FUSE->FUSE_CR = FUSE_CR_WRQ | FUSE_CR_KEY_VALID;
    /* Check the WS bit of FUSE_SRx, when WS has a value of ¡°1¡± the fuse write process
    is over. */
    while (!((FUSE->FUSE_IR & FUSE_IR_WS) == FUSE_IR_WS));
    /* Disable peripheral clock. */
    PMC->PMC_PCDR1 = (1 << (ID_FUSE - 32 ));
}