daily_automated

trunk/Arduino/hardware/custom/avr/zzz.libraries.old/SdFat/MinimumSerial.cpp

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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)