daily_automated

trunk/Arduino/libraries/arduino_792455/src/MinimumSerial.cpp

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+/**
+ * Copyright (c) 2011-2018 Bill Greiman
+ * This file is part of the SdFat library for SD memory cards.
+ *
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include "SysCall.h"
+#if defined(UDR0) || defined(DOXYGEN)
+#include "MinimumSerial.h"
+const uint16_t MIN_2X_BAUD = F_CPU/(4*(2*0XFFF + 1)) + 1;
+//------------------------------------------------------------------------------
+int MinimumSerial::available() {
+  return UCSR0A & (1 << RXC0) ? 1 : 0;
+}
+//------------------------------------------------------------------------------
+void MinimumSerial::begin(uint32_t baud) {
+  uint16_t baud_setting;
+  // don't worry, the compiler will squeeze out F_CPU != 16000000UL
+  if ((F_CPU != 16000000UL || baud != 57600) && baud > MIN_2X_BAUD) {
+    // 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);
+}
+//------------------------------------------------------------------------------
+void MinimumSerial::flush() {
+  while (((1 << UDRIE0) & UCSR0B) || !(UCSR0A & (1 << UDRE0))) {}
+}
+//------------------------------------------------------------------------------
+int MinimumSerial::read() {
+  if (UCSR0A & (1 << RXC0)) {
+    return UDR0;
+  }
+  return -1;
+}
+//------------------------------------------------------------------------------
+size_t MinimumSerial::write(uint8_t b) {
+  while (((1 << UDRIE0) & UCSR0B) || !(UCSR0A & (1 << UDRE0))) {}
+  UDR0 = b;
+  return 1;
+}
+#endif  //  defined(UDR0) || defined(DOXYGEN)