uart.h

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/******************************************************************************
*  Filename:       uart.h
*  Revised:        2015-11-26 13:48:57 +0100 (Thu, 26 Nov 2015)
*  Revision:       45216
*
*  Description:    Defines and prototypes for the UART.
*
*  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 __UART_H__
#define __UART_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_types.h>
#include <inc/hw_uart.h>
#include <inc/hw_memmap.h>
#include <inc/hw_ints.h>
#include <driverlib/interrupt.h>
#include <driverlib/debug.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 UARTFIFOLevelGet                NOROM_UARTFIFOLevelGet
    #define UARTConfigSetExpClk             NOROM_UARTConfigSetExpClk
    #define UARTConfigGetExpClk             NOROM_UARTConfigGetExpClk
    #define UARTDisable                     NOROM_UARTDisable
    #define UARTCharGetNonBlocking          NOROM_UARTCharGetNonBlocking
    #define UARTCharGet                     NOROM_UARTCharGet
    #define UARTCharPutNonBlocking          NOROM_UARTCharPutNonBlocking
    #define UARTCharPut                     NOROM_UARTCharPut
    #define UARTIntRegister                 NOROM_UARTIntRegister
    #define UARTIntUnregister               NOROM_UARTIntUnregister
#endif

//*****************************************************************************
//
// Values that can be passed to UARTIntEnable, UARTIntDisable, and UARTIntClear
// as the ui32IntFlags parameter, and returned from UARTIntStatus.
//
//*****************************************************************************
#define UART_INT_OE             0x400       // Overrun Error Interrupt Mask
#define UART_INT_BE             0x200       // Break Error Interrupt Mask
#define UART_INT_PE             0x100       // Parity Error Interrupt Mask
#define UART_INT_FE             0x080       // Framing Error Interrupt Mask
#define UART_INT_RT             0x040       // Receive Timeout Interrupt Mask
#define UART_INT_TX             0x020       // Transmit Interrupt Mask
#define UART_INT_RX             0x010       // Receive Interrupt Mask
#define UART_INT_CTS            0x002       // CTS Modem Interrupt Mask

//*****************************************************************************
//
// Values that can be passed to UARTConfigSetExpClk as the ui32Config parameter
// and returned by UARTConfigGetExpClk in the pui32Config parameter.
// Additionally, the UART_CONFIG_PAR_* subset can be passed to
// UARTParityModeSet as the ui32Parity parameter, and are returned by
// UARTParityModeGet.
//
//*****************************************************************************
#define UART_CONFIG_WLEN_MASK   0x00000060  // Mask for extracting word length
#define UART_CONFIG_WLEN_8      0x00000060  // 8 bit data
#define UART_CONFIG_WLEN_7      0x00000040  // 7 bit data
#define UART_CONFIG_WLEN_6      0x00000020  // 6 bit data
#define UART_CONFIG_WLEN_5      0x00000000  // 5 bit data
#define UART_CONFIG_STOP_MASK   0x00000008  // Mask for extracting stop bits
#define UART_CONFIG_STOP_ONE    0x00000000  // One stop bit
#define UART_CONFIG_STOP_TWO    0x00000008  // Two stop bits
#define UART_CONFIG_PAR_MASK    0x00000086  // Mask for extracting parity
#define UART_CONFIG_PAR_NONE    0x00000000  // No parity
#define UART_CONFIG_PAR_EVEN    0x00000006  // Even parity
#define UART_CONFIG_PAR_ODD     0x00000002  // Odd parity
#define UART_CONFIG_PAR_ONE     0x00000082  // Parity bit is one
#define UART_CONFIG_PAR_ZERO    0x00000086  // Parity bit is zero

//*****************************************************************************
//
// Values that can be passed to UARTFIFOLevelSet as the ui32TxLevel parameter
// and returned by UARTFIFOLevelGet in the pui32TxLevel.
//
//*****************************************************************************
#define UART_FIFO_TX1_8         0x00000000  // Transmit interrupt at 1/8 Full
#define UART_FIFO_TX2_8         0x00000001  // Transmit interrupt at 1/4 Full
#define UART_FIFO_TX4_8         0x00000002  // Transmit interrupt at 1/2 Full
#define UART_FIFO_TX6_8         0x00000003  // Transmit interrupt at 3/4 Full
#define UART_FIFO_TX7_8         0x00000004  // Transmit interrupt at 7/8 Full

//*****************************************************************************
//
// Values that can be passed to UARTFIFOLevelSet as the ui32RxLevel parameter
// and returned by UARTFIFOLevelGet in the pui32RxLevel.
//
//*****************************************************************************
#define UART_FIFO_RX1_8         0x00000000  // Receive interrupt at 1/8 Full
#define UART_FIFO_RX2_8         0x00000008  // Receive interrupt at 1/4 Full
#define UART_FIFO_RX4_8         0x00000010  // Receive interrupt at 1/2 Full
#define UART_FIFO_RX6_8         0x00000018  // Receive interrupt at 3/4 Full
#define UART_FIFO_RX7_8         0x00000020  // Receive interrupt at 7/8 Full

//*****************************************************************************
//
// Values that can be passed to UARTDMAEnable() and UARTDMADisable().
//
//*****************************************************************************
#define UART_DMA_ERR_RXSTOP     0x00000004  // Stop DMA receive if UART error
#define UART_DMA_TX             0x00000002  // Enable DMA for transmit
#define UART_DMA_RX             0x00000001  // Enable DMA for receive

//*****************************************************************************
//
// Values returned from UARTRxErrorGet().
//
//*****************************************************************************
#define UART_RXERROR_OVERRUN    0x00000008
#define UART_RXERROR_BREAK      0x00000004
#define UART_RXERROR_PARITY     0x00000002
#define UART_RXERROR_FRAMING    0x00000001

//*****************************************************************************
//
// Values returned from the UARTBusy().
//
//*****************************************************************************
#define UART_BUSY               0x00000001
#define UART_IDLE               0x00000000

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

#ifdef DRIVERLIB_DEBUG
//*****************************************************************************
//
//
//*****************************************************************************
static bool
UARTBaseValid(uint32_t ui32Base)
{
    return(ui32Base == UART0_BASE);
}
#endif

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTParityModeSet(uint32_t ui32Base, uint32_t ui32Parity)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));
    ASSERT((ui32Parity == UART_CONFIG_PAR_NONE) ||
           (ui32Parity == UART_CONFIG_PAR_EVEN) ||
           (ui32Parity == UART_CONFIG_PAR_ODD) ||
           (ui32Parity == UART_CONFIG_PAR_ONE) ||
           (ui32Parity == UART_CONFIG_PAR_ZERO));

    //
    // Set the parity mode.
    //
    HWREG(ui32Base + UART_O_LCRH) = ((HWREG(ui32Base + UART_O_LCRH) &
                                      ~(UART_LCRH_SPS | UART_LCRH_EPS |
                                        UART_LCRH_PEN)) | ui32Parity);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
UARTParityModeGet(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Return the current parity setting
    //
    return(HWREG(ui32Base + UART_O_LCRH) &
           (UART_LCRH_SPS | UART_LCRH_EPS | UART_LCRH_PEN));
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTFIFOLevelSet(uint32_t ui32Base, uint32_t ui32TxLevel,
                 uint32_t ui32RxLevel)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));
    ASSERT((ui32TxLevel == UART_FIFO_TX1_8) ||
           (ui32TxLevel == UART_FIFO_TX2_8) ||
           (ui32TxLevel == UART_FIFO_TX4_8) ||
           (ui32TxLevel == UART_FIFO_TX6_8) ||
           (ui32TxLevel == UART_FIFO_TX7_8));
    ASSERT((ui32RxLevel == UART_FIFO_RX1_8) ||
           (ui32RxLevel == UART_FIFO_RX2_8) ||
           (ui32RxLevel == UART_FIFO_RX4_8) ||
           (ui32RxLevel == UART_FIFO_RX6_8) ||
           (ui32RxLevel == UART_FIFO_RX7_8));

    //
    // Set the FIFO interrupt levels.
    //
    HWREG(ui32Base + UART_O_IFLS) = ui32TxLevel | ui32RxLevel;
}

//*****************************************************************************
//
//
//*****************************************************************************
extern void UARTFIFOLevelGet(uint32_t ui32Base, uint32_t *pui32TxLevel,
                             uint32_t *pui32RxLevel);

//*****************************************************************************
//
//
//*****************************************************************************
extern void UARTConfigSetExpClk(uint32_t ui32Base, uint32_t ui32UARTClk,
                                uint32_t ui32Baud, uint32_t ui32Config);

//*****************************************************************************
//
//
//*****************************************************************************
extern void UARTConfigGetExpClk(uint32_t ui32Base, uint32_t ui32UARTClk,
                                uint32_t *pui32Baud, uint32_t *pui32Config);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTEnable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Enable the FIFO.
    //
    HWREG(ui32Base + UART_O_LCRH) |= UART_LCRH_FEN;

    //
    // Enable RX, TX, and the UART.
    //
    HWREG(ui32Base + UART_O_CTL) |= (UART_CTL_UARTEN | UART_CTL_TXE |
                                     UART_CTL_RXE);
}

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

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTFIFOEnable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Enable the FIFO.
    //
    HWREG(ui32Base + UART_O_LCRH) |= UART_LCRH_FEN;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTFIFODisable(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Disable the FIFO.
    //
    HWREG(ui32Base + UART_O_LCRH) &= ~(UART_LCRH_FEN);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE bool
UARTCharsAvail(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Return the availability of characters.
    //
    return((HWREG(ui32Base + UART_O_FR) & UART_FR_RXFE) ? false : true);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE bool
UARTSpaceAvail(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Return the availability of space.
    //
    return((HWREG(ui32Base + UART_O_FR) & UART_FR_TXFF) ? false : true);
}

//*****************************************************************************
//
//
//*****************************************************************************
extern int32_t UARTCharGetNonBlocking(uint32_t ui32Base);

//*****************************************************************************
//
//
//*****************************************************************************
extern int32_t UARTCharGet(uint32_t ui32Base);

//*****************************************************************************
//
//
//*****************************************************************************
extern bool UARTCharPutNonBlocking(uint32_t ui32Base, uint8_t ui8Data);

//*****************************************************************************
//
//
//*****************************************************************************
extern void UARTCharPut(uint32_t ui32Base, uint8_t ui8Data);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE bool
UARTBusy(uint32_t ui32Base)
{
    //
    // Check the argument.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Determine if the UART is busy.
    //
    return((HWREG(ui32Base + UART_O_FR) & UART_FR_BUSY) ?
           UART_BUSY : UART_IDLE);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTBreakCtl(uint32_t ui32Base, bool bBreakState)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Set the break condition as requested.
    //
    HWREG(ui32Base + UART_O_LCRH) =
         (bBreakState ?
         (HWREG(ui32Base + UART_O_LCRH) | UART_LCRH_BRK) :
         (HWREG(ui32Base + UART_O_LCRH) & ~(UART_LCRH_BRK)));
}

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

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

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

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

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

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

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

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

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTIntClear(uint32_t ui32Base, uint32_t ui32IntFlags)
{
    //
    // Check the arguments
    //
    ASSERT(UARTBaseValid(ui32Base));

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

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

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

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

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

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
UARTRxErrorGet(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Return the current value of the receive status register.
    //
    return(HWREG(ui32Base + UART_O_RSR) & 0x0000000F);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTRxErrorClear(uint32_t ui32Base)
{
    //
    // Check the arguments.
    //
    ASSERT(UARTBaseValid(ui32Base));

    //
    // Any write to the Error Clear Register will clear all bits which are
    // currently set.
    //
    HWREG(ui32Base + UART_O_ECR) = 0;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTHwFlowControlEnable( uint32_t ui32Base )
{
    //
    // Check the arguments.
    //
    ASSERT( UARTBaseValid( ui32Base ));

    HWREG( ui32Base + UART_O_CTL ) |= ( UART_CTL_CTSEN | UART_CTL_RTSEN );
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
UARTHwFlowControlDisable( uint32_t ui32Base )
{
    //
    // Check the arguments.
    //
    ASSERT( UARTBaseValid( ui32Base ));

    HWREG( ui32Base + UART_O_CTL ) &= ~( UART_CTL_CTSEN | UART_CTL_RTSEN );
}


//*****************************************************************************
//
// Support for DriverLib in ROM:
// Redirect to implementation in ROM when available.
//
//*****************************************************************************
#if !defined(DRIVERLIB_NOROM) && !defined(DOXYGEN)
    #include <driverlib/rom.h>
    #ifdef ROM_UARTFIFOLevelGet
        #undef  UARTFIFOLevelGet
        #define UARTFIFOLevelGet                ROM_UARTFIFOLevelGet
    #endif
    #ifdef ROM_UARTConfigSetExpClk
        #undef  UARTConfigSetExpClk
        #define UARTConfigSetExpClk             ROM_UARTConfigSetExpClk
    #endif
    #ifdef ROM_UARTConfigGetExpClk
        #undef  UARTConfigGetExpClk
        #define UARTConfigGetExpClk             ROM_UARTConfigGetExpClk
    #endif
    #ifdef ROM_UARTDisable
        #undef  UARTDisable
        #define UARTDisable                     ROM_UARTDisable
    #endif
    #ifdef ROM_UARTCharGetNonBlocking
        #undef  UARTCharGetNonBlocking
        #define UARTCharGetNonBlocking          ROM_UARTCharGetNonBlocking
    #endif
    #ifdef ROM_UARTCharGet
        #undef  UARTCharGet
        #define UARTCharGet                     ROM_UARTCharGet
    #endif
    #ifdef ROM_UARTCharPutNonBlocking
        #undef  UARTCharPutNonBlocking
        #define UARTCharPutNonBlocking          ROM_UARTCharPutNonBlocking
    #endif
    #ifdef ROM_UARTCharPut
        #undef  UARTCharPut
        #define UARTCharPut                     ROM_UARTCharPut
    #endif
    #ifdef ROM_UARTIntRegister
        #undef  UARTIntRegister
        #define UARTIntRegister                 ROM_UARTIntRegister
    #endif
    #ifdef ROM_UARTIntUnregister
        #undef  UARTIntUnregister
        #define UARTIntUnregister               ROM_UARTIntUnregister
    #endif
#endif

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

#endif //  __UART_H__

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