uart.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

//*****************************************************************************
//
// uart.c - Driver for the UART.
//
// Copyright (c) 2005-2007 Luminary Micro, Inc.  All rights reserved.
// 
// Software License Agreement
// 
// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
// exclusively on LMI's microcontroller products.
// 
// The software is owned by LMI and/or its suppliers, and is protected under
// applicable copyright laws.  All rights are reserved.  You may not combine
// this software with "viral" open-source software in order to form a larger
// program.  Any use in violation of the foregoing restrictions may subject
// the user to criminal sanctions under applicable laws, as well as to civil
// liability for the breach of the terms and conditions of this license.
// 
// THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 1952 of the Stellaris Peripheral Driver Library.
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup uart_api
//! @{
//
//*****************************************************************************

#include "../hw_ints.h"
#include "../hw_memmap.h"
#include "../hw_types.h"
#include "../hw_uart.h"
#include "debug.h"
#include "interrupt.h"
#include "sysctl.h"
#include "uart.h"

//*****************************************************************************
//
//! Sets the type of parity.
//!
//! \param ulBase is the base address of the UART port.
//! \param ulParity specifies the type of parity to use.
//!
//! Sets the type of parity to use for transmitting and expect when receiving.
//! The \e ulParity parameter must be one of \b UART_CONFIG_PAR_NONE,
//! \b UART_CONFIG_PAR_EVEN, \b UART_CONFIG_PAR_ODD, \b UART_CONFIG_PAR_ONE,
//! or \b UART_CONFIG_PAR_ZERO.  The last two allow direct control of the
//! parity bit; it will always be either be one or zero based on the mode.
//!
//! \return None.
//
//*****************************************************************************
void
UARTParityModeSet(unsigned long ulBase, unsigned long ulParity)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));
    ASSERT((ulParity == UART_CONFIG_PAR_NONE) ||
           (ulParity == UART_CONFIG_PAR_EVEN) ||
           (ulParity == UART_CONFIG_PAR_ODD) ||
           (ulParity == UART_CONFIG_PAR_ONE) ||
           (ulParity == UART_CONFIG_PAR_ZERO));

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

//*****************************************************************************
//
//! Gets the type of parity currently being used.
//!
//! \param ulBase is the base address of the UART port.
//!
//! This function gets the type of parity used for transmitting data, and
//! expected when receiving data.
//!
//! \return Returns the current parity settings, specified as one of
//! \b UART_CONFIG_PAR_NONE, \b UART_CONFIG_PAR_EVEN, \b UART_CONFIG_PAR_ODD,
//! \b UART_CONFIG_PAR_ONE, or \b UART_CONFIG_PAR_ZERO.
//
//*****************************************************************************
unsigned long
UARTParityModeGet(unsigned long ulBase)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));

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

//*****************************************************************************
//
//! Sets the FIFO level at which interrupts are generated.
//!
//! \param ulBase is the base address of the UART port.
//! \param ulTxLevel is the transmit FIFO interrupt level, specified as one of
//! \b UART_FIFO_TX1_8, \b UART_FIFO_TX2_8, \b UART_FIFO_TX4_8,
//! \b UART_FIFO_TX6_8, or \b UART_FIFO_TX7_8.
//! \param ulRxLevel is the receive FIFO interrupt level, specified as one of
//! \b UART_FIFO_RX1_8, \b UART_FIFO_RX2_8, \b UART_FIFO_RX4_8,
//! \b UART_FIFO_RX6_8, or \b UART_FIFO_RX7_8.
//!
//! This function sets the FIFO level at which transmit and receive interrupts
//! will be generated.
//!
//! \return None.
//
//*****************************************************************************
void
UARTFIFOLevelSet(unsigned long ulBase, unsigned long ulTxLevel,
                 unsigned long ulRxLevel)
{
    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));
    ASSERT((ulTxLevel == UART_FIFO_TX1_8) ||
           (ulTxLevel == UART_FIFO_TX2_8) ||
           (ulTxLevel == UART_FIFO_TX4_8) ||
           (ulTxLevel == UART_FIFO_TX6_8) ||
           (ulTxLevel == UART_FIFO_TX7_8));
    ASSERT((ulRxLevel == UART_FIFO_RX1_8) ||
           (ulRxLevel == UART_FIFO_RX2_8) ||
           (ulRxLevel == UART_FIFO_RX4_8) ||
           (ulRxLevel == UART_FIFO_RX6_8) ||
           (ulRxLevel == UART_FIFO_RX7_8));

    //
    // Set the FIFO interrupt levels.
    //
    HWREG(ulBase + UART_O_IFLS) = ulTxLevel | ulRxLevel;
}

//*****************************************************************************
//
//! Gets the FIFO level at which interrupts are generated.
//!
//! \param ulBase is the base address of the UART port.
//! \param pulTxLevel is a pointer to storage for the transmit FIFO level,
//! returned as one of \b UART_FIFO_TX1_8, \b UART_FIFO_TX2_8,
//! \b UART_FIFO_TX4_8, \b UART_FIFO_TX6_8, or UART_FIFO_TX7_8.
//! \param pulRxLevel is a pointer to storage for the receive FIFO level,
//! returned as one of \b UART_FIFO_RX1_8, \b UART_FIFO_RX2_8,
//! \b UART_FIFO_RX4_8, \b UART_FIFO_RX6_8, or \b UART_FIFO_RX7_8.
//!
//! This function gets the FIFO level at which transmit and receive interrupts
//! will be generated.
//!
//! \return None.
//
//*****************************************************************************
void
UARTFIFOLevelGet(unsigned long ulBase, unsigned long *pulTxLevel,
                 unsigned long *pulRxLevel)
{
    unsigned long ulTemp;

    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));

    //
    // Read the FIFO level register.
    //
    ulTemp = HWREG(ulBase + UART_O_IFLS);

    //
    // Extract the transmit and receive FIFO levels.
    //
    *pulTxLevel = ulTemp & UART_IFLS_TX_M;
    *pulRxLevel = ulTemp & UART_IFLS_RX_M;
}

//*****************************************************************************
//
//! Sets the configuration of a UART.
//!
//! \param ulBase is the base address of the UART port.
//! \param ulUARTClk is the rate of the clock supplied to the UART module.
//! \param ulBaud is the desired baud rate.
//! \param ulConfig is the data format for the port (number of data bits,
//! number of stop bits, and parity).
//!
//! This function will configure the UART for operation in the specified data
//! format.  The baud rate is provided in the \e ulBaud parameter and the data
//! format in the \e ulConfig parameter.
//!
//! The \e ulConfig parameter is the logical OR of three values: the number of
//! data bits, the number of stop bits, and the parity.  \b UART_CONFIG_WLEN_8,
//! \b UART_CONFIG_WLEN_7, \b UART_CONFIG_WLEN_6, and \b UART_CONFIG_WLEN_5
//! select from eight to five data bits per byte (respectively).
//! \b UART_CONFIG_STOP_ONE and \b UART_CONFIG_STOP_TWO select one or two stop
//! bits (respectively).  \b UART_CONFIG_PAR_NONE, \b UART_CONFIG_PAR_EVEN,
//! \b UART_CONFIG_PAR_ODD, \b UART_CONFIG_PAR_ONE, and \b UART_CONFIG_PAR_ZERO
//! select the parity mode (no parity bit, even parity bit, odd parity bit,
//! parity bit always one, and parity bit always zero, respectively).
//!
//! The peripheral clock will be the same as the processor clock.  This will be
//! the value returned by SysCtlClockGet(), or it can be explicitly hard coded
//! if it is constant and known (to save the code/execution overhead of a call
//! to SysCtlClockGet()).
//!
//! This function replaces the original UARTConfigSet() API and performs the
//! same actions.  A macro is provided in <tt>uart.h</tt> to map the original
//! API to this API.
//!
//! \return None.
//
//*****************************************************************************
void
UARTConfigSetExpClk(unsigned long ulBase, unsigned long ulUARTClk,
                    unsigned long ulBaud, unsigned long ulConfig)
{
    unsigned long ulDiv;

    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));
    ASSERT(ulUARTClk >= (ulBaud * 16));
    ASSERT(ulBaud != 0);

    //
    // Stop the UART.
    //
    UARTDisable(ulBase);

    //
    // Compute the fractional baud rate divider.
    //
    ulDiv = (((ulUARTClk * 8) / ulBaud) + 1) / 2;

    //
    // Set the baud rate.
    //
    HWREG(ulBase + UART_O_IBRD) = ulDiv / 64;
    HWREG(ulBase + UART_O_FBRD) = ulDiv % 64;

    //
    // Set parity, data length, and number of stop bits.
    //
    HWREG(ulBase + UART_O_LCRH) = ulConfig;

    //
    // Clear the flags register.
    //
    HWREG(ulBase + UART_O_FR) = 0;

    //
    // Start the UART.
    //
    UARTEnable(ulBase);
}

//*****************************************************************************
//
//! Gets the current configuration of a UART.
//!
//! \param ulBase is the base address of the UART port.
//! \param ulUARTClk is the rate of the clock supplied to the UART module.
//! \param pulBaud is a pointer to storage for the baud rate.
//! \param pulConfig is a pointer to storage for the data format.
//!
//! The baud rate and data format for the UART is determined, given an
//! explicitly provided peripheral clock (hence the ExpClk suffix).  The
//! returned baud rate is the actual baud rate; it may not be the exact baud
//! rate requested or an ``official'' baud rate.  The data format returned in
//! \e pulConfig is enumerated the same as the \e ulConfig parameter of
//! UARTConfigSetExpClk().
//!
//! The peripheral clock will be the same as the processor clock.  This will be
//! the value returned by SysCtlClockGet(), or it can be explicitly hard coded
//! if it is constant and known (to save the code/execution overhead of a call
//! to SysCtlClockGet()).
//!
//! This function replaces the original UARTConfigGet() API and performs the
//! same actions.  A macro is provided in <tt>uart.h</tt> to map the original
//! API to this API.
//!
//! \return None.
//
//*****************************************************************************
void
UARTConfigGetExpClk(unsigned long ulBase, unsigned long ulUARTClk,
                    unsigned long *pulBaud, unsigned long *pulConfig)
{
    unsigned long ulInt, ulFrac;

    //
    // Check the arguments.
    //
    ASSERT((ulBase == UART0_BASE) || (ulBase == UART1_BASE) ||
           (ulBase == UART2_BASE));

    //
    // Compute the baud rate.
    //
    ulInt = HWREG(ulBase + UART_O_IBRD);
    ulFrac = HWREG(ulBase + UART_O_FBRD);