ssi.h

Go to the documentation of this file.

/******************************************************************************
*  Filename:       ssi.h
*  Revised:        2015-09-21 15:19:36 +0200 (Mon, 21 Sep 2015)
*  Revision:       44629
*
*  Description:    Defines and macros for the SSI.
*
*  Copyright (c) 2015, Texas Instruments Incorporated
*  All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions are met:
*
*  1) Redistributions of source code must retain the above copyright notice,
*     this list of conditions and the following disclaimer.
*
*  2) Redistributions in binary form must reproduce the above copyright notice,
*     this list of conditions and the following disclaimer in the documentation
*     and/or other materials provided with the distribution.
*
*  3) Neither the name of the ORGANIZATION nor the names of its contributors may
*     be used to endorse or promote products derived from this software without
*     specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
*  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
*  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
*  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
*  POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/

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

#ifndef __SSI_H__
#define __SSI_H__

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

#include <stdbool.h>
#include <stdint.h>
#include <inc/hw_ints.h>
#include <inc/hw_memmap.h>
#include <inc/hw_types.h>
#include <inc/hw_ssi.h>
#include <driverlib/debug.h>
#include <driverlib/interrupt.h>

//*****************************************************************************
//
// Support for DriverLib in ROM:
// This section renames all functions that are not "static inline", so that
// calling these functions will default to implementation in flash. At the end
// of this file a second renaming will change the defaults to implementation in
// ROM for available functions.
//
// To force use of the implementation in flash, e.g. for debugging:
// - Globally: Define DRIVERLIB_NOROM at project level
// - Per function: Use prefix "NOROM_" when calling the function
//
//*****************************************************************************
#if !defined(DOXYGEN)
    #define SSIConfigSetExpClk              NOROM_SSIConfigSetExpClk
    #define SSIDataPut                      NOROM_SSIDataPut
    #define SSIDataPutNonBlocking           NOROM_SSIDataPutNonBlocking
    #define SSIDataGet                      NOROM_SSIDataGet
    #define SSIDataGetNonBlocking           NOROM_SSIDataGetNonBlocking
    #define SSIIntRegister                  NOROM_SSIIntRegister
    #define SSIIntUnregister                NOROM_SSIIntUnregister
#endif

//*****************************************************************************
//
// Values that can be passed to SSIIntEnable, SSIIntDisable, and SSIIntClear
// as the ui32IntFlags parameter, and returned by SSIIntStatus.
//
//*****************************************************************************
#define SSI_TXFF                0x00000008  // TX FIFO half full or less
#define SSI_RXFF                0x00000004  // RX FIFO half full or more
#define SSI_RXTO                0x00000002  // RX timeout
#define SSI_RXOR                0x00000001  // RX overrun

//*****************************************************************************
//
// Values that are returned from SSIStatus
//
//*****************************************************************************
#define SSI_RX_FULL             0x00000008  // Receive FIFO full
#define SSI_RX_NOT_EMPTY        0x00000004  // Receive FIFO not empty
#define SSI_TX_NOT_FULL         0x00000002  // Transmit FIFO not full
#define SSI_TX_EMPTY            0x00000001  // Transmit FIFO empty
#define SSI_STATUS_MASK         0x0000000F

//*****************************************************************************
//
// Values that can be passed to SSIConfigSetExpClk.
//
//*****************************************************************************
#define SSI_FRF_MOTO_MODE_0     0x00000000  // Moto fmt, polarity 0, phase 0
#define SSI_FRF_MOTO_MODE_1     0x00000002  // Moto fmt, polarity 0, phase 1
#define SSI_FRF_MOTO_MODE_2     0x00000001  // Moto fmt, polarity 1, phase 0
#define SSI_FRF_MOTO_MODE_3     0x00000003  // Moto fmt, polarity 1, phase 1
#define SSI_FRF_TI              0x00000010  // TI frame format
#define SSI_FRF_NMW             0x00000020  // National MicroWire frame format

#define SSI_MODE_MASTER         0x00000000  // SSI master
#define SSI_MODE_SLAVE          0x00000001  // SSI slave
#define SSI_MODE_SLAVE_OD       0x00000002  // SSI slave with output disabled

//*****************************************************************************
//
// Values that can be passed to SSIDMAEnable() and SSIDMADisable().
//
//*****************************************************************************
#define SSI_DMA_TX              0x00000002  // Enable DMA for transmit
#define SSI_DMA_RX              0x00000001  // Enable DMA for receive

//*****************************************************************************
//
// API Functions and prototypes
//
//*****************************************************************************

#ifdef DRIVERLIB_DEBUG
//*****************************************************************************
//
//
//*****************************************************************************
static bool
SSIBaseValid(uint32_t ui32Base)
{
    return(ui32Base == SSI0_BASE || ui32Base == SSI1_BASE);
}
#endif

//*****************************************************************************
//
//
//*****************************************************************************
extern void SSIConfigSetExpClk(uint32_t ui32Base, uint32_t ui32SSIClk,
                               uint32_t ui32Protocol, uint32_t ui32Mode,
                               uint32_t ui32BitRate, uint32_t ui32DataWidth);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIEnable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Read-modify-write the enable bit.
    //
    HWREG(ui32Base + SSI_O_CR1) |= SSI_CR1_SSE;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIDisable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Read-modify-write the enable bit.
    //
    HWREG(ui32Base + SSI_O_CR1) &= ~(SSI_CR1_SSE);
}

//*****************************************************************************
//
//
//*****************************************************************************
extern void SSIDataPut(uint32_t ui32Base, uint32_t ui32Data);

//*****************************************************************************
//
//
//*****************************************************************************
extern int32_t SSIDataPutNonBlocking(uint32_t ui32Base, uint32_t ui32Data);

//*****************************************************************************
//
//
//*****************************************************************************
extern void SSIDataGet(uint32_t ui32Base, uint32_t *pui32Data);

//*****************************************************************************
//
//
//*****************************************************************************
extern int32_t SSIDataGetNonBlocking(uint32_t ui32Base, uint32_t *pui32Data);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE bool
SSIBusy(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Determine if the SSI is busy.
    //
    return((HWREG(ui32Base + SSI_O_SR) & SSI_SR_BSY) ? true : false);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
SSIStatus(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Return the status
    //
    return (HWREG(ui32Base + SSI_O_SR) & SSI_STATUS_MASK);
}

//*****************************************************************************
//
//
//*****************************************************************************
extern void SSIIntRegister(uint32_t ui32Base, void (*pfnHandler)(void));

//*****************************************************************************
//
//
//*****************************************************************************
extern void SSIIntUnregister(uint32_t ui32Base);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIIntEnable(uint32_t ui32Base, uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Enable the specified interrupts.
    //
    HWREG(ui32Base + SSI_O_IMSC) |= ui32IntFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIIntDisable(uint32_t ui32Base, uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Disable the specified interrupts.
    //
    HWREG(ui32Base + SSI_O_IMSC) &= ~(ui32IntFlags);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIIntClear(uint32_t ui32Base, uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Clear the requested interrupt sources.
    //
    HWREG(ui32Base + SSI_O_ICR) = ui32IntFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
SSIIntStatus(uint32_t ui32Base, bool bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        return(HWREG(ui32Base + SSI_O_MIS));
    }
    else
    {
        return(HWREG(ui32Base + SSI_O_RIS));
    }
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIDMAEnable(uint32_t ui32Base, uint32_t ui32DMAFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Set the requested bits in the SSI DMA control register.
    //
    HWREG(ui32Base + SSI_O_DMACR) |= ui32DMAFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
SSIDMADisable(uint32_t ui32Base, uint32_t ui32DMAFlags)
{
    //
    // Check the arguments.
    //
    ASSERT(SSIBaseValid(ui32Base));

    //
    // Clear the requested bits in the SSI DMA control register.
    //
    HWREG(ui32Base + SSI_O_DMACR) &= ~ui32DMAFlags;
}

//*****************************************************************************
//
// Support for DriverLib in ROM:
// Redirect to implementation in ROM when available.
//
//*****************************************************************************
#if !defined(DRIVERLIB_NOROM) && !defined(DOXYGEN)
    #include <driverlib/rom.h>
    #ifdef ROM_SSIConfigSetExpClk
        #undef  SSIConfigSetExpClk
        #define SSIConfigSetExpClk              ROM_SSIConfigSetExpClk
    #endif
    #ifdef ROM_SSIDataPut
        #undef  SSIDataPut
        #define SSIDataPut                      ROM_SSIDataPut
    #endif
    #ifdef ROM_SSIDataPutNonBlocking
        #undef  SSIDataPutNonBlocking
        #define SSIDataPutNonBlocking           ROM_SSIDataPutNonBlocking
    #endif
    #ifdef ROM_SSIDataGet
        #undef  SSIDataGet
        #define SSIDataGet                      ROM_SSIDataGet
    #endif
    #ifdef ROM_SSIDataGetNonBlocking
        #undef  SSIDataGetNonBlocking
        #define SSIDataGetNonBlocking           ROM_SSIDataGetNonBlocking
    #endif
    #ifdef ROM_SSIIntRegister
        #undef  SSIIntRegister
        #define SSIIntRegister                  ROM_SSIIntRegister
    #endif
    #ifdef ROM_SSIIntUnregister
        #undef  SSIIntUnregister
        #define SSIIntUnregister                ROM_SSIIntUnregister
    #endif
#endif

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

#endif // __SSI_H__

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