Please see the serial_debugger project (https://git.kemonine.info/kemonine/serial_debugger) instead of this project. This project has been replaced by serial_debugger.
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/* Arduino SdFat Library
* Copyright (C) 2012 by William Greiman
*
* This file is part of the Arduino SdFat Library
*
* This Library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Arduino SdFat Library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <Arduino.h>
#if defined(UDR0) || defined(DOXYGEN)
#include <MinimumSerial.h>
//------------------------------------------------------------------------------
/**
* Set baud rate for serial port zero and enable in non interrupt mode.
* Do not call this function if you use another serial library.
* \param[in] baud rate
*/
void MinimumSerial::begin(unsigned long baud) {
uint16_t baud_setting;
// don't worry, the compiler will squeeze out F_CPU != 16000000UL
if (F_CPU != 16000000UL || baud != 57600) {
// Double the USART Transmission Speed
UCSR0A = 1 << U2X0;
baud_setting = (F_CPU / 4 / baud - 1) / 2;
} else {
// hardcoded exception for compatibility with the bootloader shipped
// with the Duemilanove and previous boards and the firmware on the 8U2
// on the Uno and Mega 2560.
UCSR0A = 0;
baud_setting = (F_CPU / 8 / baud - 1) / 2;
}
// assign the baud_setting
UBRR0H = baud_setting >> 8;
UBRR0L = baud_setting;
// enable transmit and receive
UCSR0B |= (1 << TXEN0) | (1 << RXEN0) ;
}
//------------------------------------------------------------------------------
/**
* Unbuffered read
* \return -1 if no character is available or an available character.
*/
int MinimumSerial::read() {
if (UCSR0A & (1 << RXC0)) return UDR0;
return -1;
}
//------------------------------------------------------------------------------
/**
* Unbuffered write
*
* \param[in] b byte to write.
* \return 1
*/
size_t MinimumSerial::write(uint8_t b) {
while (((1 << UDRIE0) & UCSR0B) || !(UCSR0A & (1 << UDRE0))) {}
UDR0 = b;
return 1;
}
MinimumSerial MiniSerial;
#endif // defined(UDR0) || defined(DOXYGEN)