LUFA/Drivers/Peripheral/AVR8/Serial.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  ADC driver for the 8-bit AVRs.
  34  *
  35  *  \note This file should not be included directly. It is automatically included as needed by the USART driver
  36  *        dispatch header located in LUFA/Drivers/Peripheral/Serial.h.
  37  */
  38
  39 /** \ingroup Group_Serial
  40  *  @defgroup Group_Serial_AVR8 8-Bit AVR Serial Driver
  41  *
  42  *  Serial driver for the 8-bit AVRs.
  43  *
  44  *  \note This file should not be included directly. It is automatically included as needed by the ADC driver
  45  *        dispatch header located in LUFA/Drivers/Peripheral/USART.h.
  46  *
  47  *  @{
  48  */
  49
  50 #ifndef __SERIAL_AVR8_H__
  51 #define __SERIAL_AVR8_H__
  52
  53         /* Includes: */
  54                 #include <avr/io.h>
  55                 #include <avr/pgmspace.h>
  56                 #include <stdbool.h>
  57
  58         /* Preprocessor Checks: */
  59                 #if !defined(__INCLUDE_FROM_SERIAL_H)
  60                         #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead.
  61                 #endif
  62
  63         /* Public Interface - May be used in end-application: */
  64                 /* Macros: */
  65                         /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
  66                          *  not set.
  67                          */
  68                         #define SERIAL_UBBRVAL(baud)    ((((F_CPU / 16) + (baud / 2)) / (baud)) - 1)
  69
  70                         /** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
  71                          *  set.
  72                          */
  73                         #define SERIAL_2X_UBBRVAL(baud) ((((F_CPU / 8) + (baud / 2)) / (baud)) - 1)
  74
  75                 /* Pseudo-Function Macros: */
  76                         #if defined(__DOXYGEN__)
  77                                 /** Indicates whether a character has been received through the USART.
  78                                  *
  79                                  *  \return Boolean true if a character has been received, false otherwise
  80                                  */
  81                                 static inline bool Serial_IsCharReceived(void);
  82                         #else
  83                                 #define Serial_IsCharReceived() ((UCSR1A & (1 << RXC1)) ? true : false)
  84                         #endif
  85
  86                 /* Inline Functions: */
  87                         /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
  88                          *  standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
  89                          *
  90                          *  \param[in] BaudRate     Serial baud rate, in bits per second
  91                          *  \param[in] DoubleSpeed  Enables double speed mode when set, halving the sample time to double the baud rate
  92                          */
  93                         static inline void Serial_Init(const uint32_t BaudRate, const bool DoubleSpeed)
  94                         {
  95                                 UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0);
  96                                 UCSR1B = ((1 << TXEN1)  | (1 << RXEN1));
  97                                 UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
  98
  99                                 DDRD  |= (1 << 3);
 100                                 PORTD |= (1 << 2);
 101
 102                                 UBRR1  = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
 103                         }
 104
 105                         /** Turns off the USART driver, disabling and returning used hardware to their default configuration. */
 106                         static inline void Serial_ShutDown(void)
 107                         {
 108                                 UCSR1A = 0;
 109                                 UCSR1B = 0;
 110                                 UCSR1C = 0;
 111
 112                                 DDRD  &= ~(1 << 3);
 113                                 PORTD &= ~(1 << 2);
 114
 115                                 UBRR1  = 0;
 116                         }
 117
 118                         /** Transmits a given byte through the USART.
 119                          *
 120                          *  \param[in] DataByte  Byte to transmit through the USART
 121                          */
 122                         static inline void Serial_TxByte(const char DataByte)
 123                         {
 124                                 while (!(UCSR1A & (1 << UDRE1)));
 125                                 UDR1 = DataByte;
 126                         }
 127
 128                         /** Receives a byte from the USART.
 129                          *
 130                          *  \return Byte received from the USART
 131                          */
 132                         static inline uint8_t Serial_RxByte(void)
 133                         {
 134                                 while (!(UCSR1A & (1 << RXC1)));
 135                                 return UDR1;
 136                         }
 137
 138         /* Disable C linkage for C++ Compilers: */
 139                 #if defined(__cplusplus)
 140                         }
 141                 #endif
 142
 143 #endif
 144
 145 /** @} */