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/*! \file rprintf.h \brief printf routine and associated routines. */
//****************************************************************************
//
// File Name    : 'rprintf.h'
// Title                : printf routine and associated routines
// Author               : Pascal Stang - Copyright (C) 2000-2002
// Created              : 2000.12.26
// Revised              : 2003.5.1
// Version              : 1.0
// Target MCU   : Atmel AVR series and other targets
// Editor Tabs  : 4
//
// NOTE: This code is currently below version 1.0, and therefore is considered
// to be lacking in some functionality or documentation, or may not be fully
// tested.  Nonetheless, you can expect most functions to work.
//
// This code is distributed under the GNU Public License
//              which can be found at http://www.gnu.org/licenses/gpl.txt
//
///     \ingroup general
/// \defgroup rprintf printf() Function Library (rprintf.c)
/// \code #include "rprintf.h" \endcode
/// \par Overview
///             The rprintf function library provides a simplified (reduced) version of
///             the common C printf() function.  See the code files for details about
///             which printf features are supported.  Also in this library are a
///             variety of functions for fast printing of certain common data types
///             (variable types).  Functions include print string from RAM, print
///             string from ROM, print string snippet, print hex byte/short/long, and
///             a custom-formatted number print, as well as an optional floating-point
///             print routine.
///
/// \note       All output from the rprintf library can be directed to any device
///             or software which accepts characters.  This means that rprintf output
///             can be sent to the UART (serial port) or can be used with the LCD
///             display libraries to print formatted text on the screen.
//
//****************************************************************************
//@{

#ifndef RPRINTF_H
#define RPRINTF_H

// needed for use of PSTR below
#include <avr/pgmspace.h>

// configuration
// defining RPRINTF_SIMPLE will compile a smaller, simpler, and faster printf() function
// defining RPRINTF_COMPLEX will compile a larger, more capable, and slower printf() function
#ifndef RPRINTF_COMPLEX
        #define RPRINTF_SIMPLE
#endif

// Define RPRINTF_FLOAT to enable the floating-point printf function: rprintfFloat()
// (adds +4600bytes or 2.2Kwords of code)

// defines/constants
#define STRING_IN_RAM   0
#define STRING_IN_ROM   1

// make a putchar for those that are used to using it
//#define putchar(c)    rprintfChar(c);

// functions

//! Initializes the rprintf library for an output stream.
/// You must call this initializer once before using any other rprintf function.
/// The argument must be a character stream output function.
void rprintfInit(void (*putchar_func)(unsigned char c));

//! prints a single character to the current output device
void rprintfChar(unsigned char c);

//! prints a null-terminated string stored in RAM
void rprintfStr(char str[]);

//! Prints a section of a string stored in RAM.
/// Begins printing at position indicated by <start>,
/// and prints number of characters indicated by <len>.
void rprintfStrLen(char str[], unsigned int start, unsigned int len);

//! prints a string stored in program rom
/// \note This function does not actually store your string in
/// program rom, but merely reads it assuming you stored it properly.
void rprintfProgStr(const prog_char str[]);

//! Using the function rprintfProgStrM(...) automatically causes 
/// your string to be stored in ROM, thereby not wasting precious RAM.
/// Example usage:
/// \code
/// rprintfProgStrM("Hello, this string is stored in program rom");
/// \endcode
#define rprintfProgStrM(string)                 (rprintfProgStr(PSTR(string)))

//! Prints a carriage-return and line-feed.
/// Useful when printing to serial ports/terminals.
void rprintfCRLF(void);

// Prints the number contained in "data" in hex format
// u04,u08,u16,and u32 functions handle 4,8,16,or 32 bits respectively
void rprintfu04(unsigned char data);    ///< Print 4-bit hex number. Outputs a single hex character.
void rprintfu08(unsigned char data);    ///< Print 8-bit hex number. Outputs two hex characters.
void rprintfu16(unsigned short data);   ///< Print 16-bit hex number. Outputs four hex characters.
void rprintfu32(unsigned long data);    ///< Print 32-bit hex number. Outputs eight hex characters.

//! A flexible integer-number printing routine.
/// Print the number "n" in the given "base", using exactly "numDigits".
///     Print +/- if signed flag "isSigned" is TRUE.
///     The character specified in "padchar" will be used to pad extra characters.
///
///     Examples:
/// \code
/// uartPrintfNum(10, 6,  TRUE, ' ',   1234);  -->  " +1234"
///     uartPrintfNum(10, 6, FALSE, '0',   1234);  -->  "001234"
///     uartPrintfNum(16, 6, FALSE, '.', 0x5AA5);  -->  "..5AA5"
/// \endcode
void rprintfNum(char base, char numDigits, char isSigned, char padchar, long n);

#ifdef RPRINTF_FLOAT
        //! floating-point print routine
        void rprintfFloat(char numDigits, double x);
#endif

// NOTE: Below you'll see the function prototypes of rprintf1RamRom and 
// rprintf2RamRom.  rprintf1RamRom and rprintf2RamRom are both reduced versions
// of the regular C printf() command.  However, they are modified to be able
// to read their text/format strings from RAM or ROM in the Atmel microprocessors.
// Unless you really intend to, do not use the "RamRom" versions of the functions
// directly.  Instead use the #defined function versions:
//
// printfx("text/format",args)    ...to keep your text/format string stored in RAM
//              - or -
// printfxROM("text/format",args) ...to keep your text/format string stored in ROM
//
// where x is either 1 or 2 for the simple or more powerful version of printf()
//
// Since there is much more ROM than RAM available in the Atmel microprocessors,
// and nearly all text/format strings are constant (never change in the course
// of the program), you should try to use the ROM printf version exclusively.
// This will ensure you leave as much RAM as possible for program variables and
// data.

//! \fn int rprintf(const char *format, ...);
/// A reduced substitute for the usual C printf() function.
/// This function actually points to either rprintf1RamRom or rprintf2RamRom
/// depending on the user's selection.  Rprintf1 is a simple small fast print
/// routine while rprintf2 is larger and slower but more capable. To choose
/// the routine you would like to use, define either RPRINTF_SIMPLE or
/// RPRINTF_COMPLEX in global.h.

#ifdef RPRINTF_SIMPLE
        //! A simple printf routine.
        /// Called by rprintf() - does a simple printf (supports %d, %x, %c).
        /// Supports:
        /// - %d - decimal
        /// - %x - hex
        /// - %c - character
        int rprintf1RamRom(unsigned char stringInRom, const char *format, ...);
        // #defines for RAM or ROM operation
        #define rprintf1(format, args...)               rprintf1RamRom(STRING_IN_ROM, PSTR(format), ## args)
        #define rprintf1RAM(format, args...)    rprintf1RamRom(STRING_IN_RAM, format, ## args)

        // *** Default rprintf(...) ***
        // this next line determines what the the basic rprintf() defaults to:
        #define rprintf(format, args...)                rprintf1RamRom(STRING_IN_ROM, PSTR(format), ## args)
#endif

#ifdef RPRINTF_COMPLEX
        //! A more powerful printf routine.
        /// Called by rprintf() - does a more powerful printf (supports %d, %u, %o, %x, %c, %s).
        /// Supports:
        /// - %d - decimal
        /// - %u - unsigned decimal
        /// - %o - octal
        /// - %x - hex
        /// - %c - character
        /// - %s - strings
        /// - and the width,precision,padding modifiers
        /// \note This printf does not support floating point numbers.
        int rprintf2RamRom(unsigned char stringInRom, const char *sfmt, ...);
        // #defines for RAM or ROM operation
        #define rprintf2(format, args...)               rprintf2RamRom(STRING_IN_ROM, format, ## args)
        #define rprintf2RAM(format, args...)    rprintf2RamRom(STRING_IN_RAM, format, ## args)

        // *** Default rprintf(...) ***
        // this next line determines what the the basic rprintf() defaults to:
        #define rprintf(format, args...)                rprintf2RamRom(STRING_IN_ROM, PSTR(format), ## args)
#endif

#endif
//@}
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