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108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/******************************************************************************
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* Filename: uart_doc.h
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* Revised: 2018-02-09 15:45:36 +0100 (fr, 09 feb 2018)
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* Revision: 51470
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*
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* Copyright (c) 2015 - 2017, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of the ORGANIZATION nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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/*!
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\addtogroup uart_api
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@{
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\section sec_uart_printf Use printf()
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DriverLib only supports writing a single character at a time to the UART buffer but it is
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possible to utilize the library function \c printf by overriding a few of the functions used by
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\c printf with a device specific definition. However, the implementation of \c printf is
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compiler specific and requires different functions to be overridden depending on the compiler.
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Using \c printf can increase code size significantly but some compilers provide a highly optimized
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and configurable implementation suitable for embedded systems which makes the code size increase
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acceptable for most applications. See the compiler's documentation for details about how to
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configure the \c printf library function.
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It is required that the application configures and enables the UART module before using \c printf
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function.
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\subsection sec_uart_printf_ccs Code Composer Studio
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In Code Composer Studio the functions \c fputc and \c fputs must be overridden.
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\code{.c}
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#include <stdio.h>
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#include <string.h>
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#define PRINTF_UART UART0_BASE
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// Override 'fputc' function in order to use printf() to output to UART
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int fputc(int _c, register FILE *_fp)
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{
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UARTCharPut(PRINTF_UART, (uint8_t)_c);
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return _c;
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}
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// Override 'fputs' function in order to use printf() to output to UART
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int fputs(const char *_ptr, register FILE *_fp)
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{
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unsigned int i, len;
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len = strlen(_ptr);
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for(i=0 ; i<len ; i++)
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{
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UARTCharPut(PRINTF_UART, (uint8_t)_ptr[i]);
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}
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return len;
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}
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\endcode
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\subsection sec_uart_printf_iar IAR
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In IAR the function \c putchar must be overridden.
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\code{.c}
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#include <stdio.h>
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#include <string.h>
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#define PRINTF_UART UART0_BASE
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// Override 'putchar' function in order to use printf() to output to UART.
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int putchar(int data)
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{
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UARTCharPut(PRINTF_UART, (uint8_t)data);
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return data;
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}
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\endcode
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@}
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*/
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