csl_i2cgethwsetup.c

TI达芬奇dm644x各硬件模块测试代码

/*  ============================================================================
 *   Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005
 *
 *   Use of this software is controlled by the terms and conditions found in the
 *   license agreement under which this software has been supplied.
 *   ===========================================================================
 */

/** @file csl_i2cGetHwSetup.c
 *
 *  @brief    File for functional layer of CSL API @a CSL_i2cGetHwSetup()
 *
 *  Description
 *    - The @a CSL_i2cGetHwSetup() function definition & it's associated
 *      functions
 *
 *  PATH  \\(CSLPATH)\\ipmodules\\i2c\\src
 *
 *  Modification 1
 *    - Modified on: 28/5/2004
 *    - Reason: created the sources
 *
 *  Date 28th May, 2004
 *  Author Santosh Narayanan.
 */

/* =============================================================================
 *  Revision History
 *  ===============
 *  11-oct-2004 Hs updated code according to code review comments.
 *  31-aug-2004 Hs Updated the CSL_i2cGetHwSetup to call respective functions.
 * =============================================================================
 */

#include <csl_i2c.h>

/** ============================================================================
 *   @n@b CSL_i2cGetHwSetup
 *
 *   @b Description
 *   @n This function gets the current setup of the I2C. The status is
 *  returned through @a CSL_I2cHwSetup. The obtaining of status
 *  is the reverse operation of @a CSL_i2cHwSetup() function.
 *
 *   @b Arguments
 *   @verbatim

            hI2c            Pointer to the object that holds reference to the
                            instance of I2C requested after the call

            hwSetup         Pointer to setup structure which contains the
                            information to program I2C to a useful state

     @endverbatim
 *
 *   <b> Return Value </b>  CSL_Status
 *   @li                    CSL_SOK             - Retrieving the hardware setup
 *                                                parameters is successful
 *   @li                    CSL_ESYS_BADHANDLE  - Invalid handle
 *   @li                    CSL_ESYS_INVPARAMS  - Invalid parameter
 *
 *   <b> Pre Condition </b>
 *   @n  Both @a CSL_i2cInit() and @a CSL_i2cOpen() must be called successfully
 *       in that order before @a CSL_i2cGetHwSetup() can be called.
 *
 *   <b> Post Condition </b>
 *   @n  The hardware setup structure is populated with the hardware setup
 *       parameters
 *
 *   @b Modifies
 *   @n hwSetup variable
 *
 *   @b Example
 *  @verbatim
      CSL_I2cHandle hI2c;
            CSL_I2cHwSetup  hwSetup;

            ...

            status = CSL_i2cGetHwSetup(hI2c, &hwSetup);

       ...

    @endverbatim
 *  ============================================================================
 */
#pragma CODE_SECTION (CSL_i2cGetHwSetup, ".text:csl_section:i2c")
CSL_Status CSL_i2cGetHwSetup (
    CSL_I2cHandle               hI2c,
    CSL_I2cHwSetup             *setup
)
{
    CSL_Status       status = CSL_SOK;
    CSL_I2cClkSetup  clkSetup;

    if (hI2c == NULL) {
        return CSL_ESYS_BADHANDLE;
    }

    if (setup == NULL) {
        return CSL_ESYS_INVPARAMS;
    }

    setup->mode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_MST);

    setup->dir = CSL_FEXT(hI2c->regs->ICMDR,I2C_ICMDR_TRX);

    setup->addrMode = CSL_FEXT(hI2c->regs->ICMDR,I2C_ICMDR_XA);

    setup->ownaddr = CSL_FEXT(hI2c->regs->ICOAR,I2C_ICOAR_OADDR);

    setup->sttbyteen = CSL_FEXT(hI2c->regs->ICMDR,I2C_ICMDR_STB);

    setup->ackMode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_NACKMOD);

    setup ->runMode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_FREE);

    setup ->repeatMode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_RM);

    setup->loopBackMode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_DLB);

    setup->freeDataFormat = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_FDF);

    setup->resetMode = CSL_FEXT(hI2c->regs->ICMDR, I2C_ICMDR_IRS);

	/* Register not supported */
	/*
    setup->bcm = CSL_FEXT(hI2c->regs->ICEMDR, I2C_ICEMDR_BCM);
	*/
    setup->inten = hI2c->regs->ICIMR ;

    /*
    setup->clksetup->prescalar = CSL_FEXT(hI2c->regs->ICPSC,I2C_ICPSC_IPSC);

    setup->clksetup->clklowdiv = CSL_FEXT(hI2c->regs->ICCLKL,I2C_ICCLKL_ICCL);

    setup->clksetup->clkhighdiv = CSL_FEXT(hI2c->regs->ICCLKH,I2C_ICCLKH_ICCH);
    */

    clkSetup.prescalar = CSL_FEXT(hI2c->regs->ICPSC,I2C_ICPSC_IPSC);
    clkSetup.clklowdiv = CSL_FEXT(hI2c->regs->ICCLKL,I2C_ICCLKL_ICCL);
    clkSetup.clkhighdiv= CSL_FEXT(hI2c->regs->ICCLKH,I2C_ICCLKH_ICCH);

    setup->clksetup->prescalar  = clkSetup.prescalar;
    setup->clksetup->clklowdiv  = clkSetup.clklowdiv;
    setup->clksetup->clkhighdiv = clkSetup.clkhighdiv;

    return status;
}