diff options
Diffstat (limited to 'cores/arduino/wiring_serial.c')
| -rwxr-xr-x | cores/arduino/wiring_serial.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/cores/arduino/wiring_serial.c b/cores/arduino/wiring_serial.c deleted file mode 100755 index 6c576d5..0000000 --- a/cores/arduino/wiring_serial.c +++ /dev/null @@ -1,129 +0,0 @@ -/* - wiring_serial.c - serial functions. - Part of Arduino - http://www.arduino.cc/ - - Copyright (c) 2005-2006 David A. Mellis - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General - Public License along with this library; if not, write to the - Free Software Foundation, Inc., 59 Temple Place, Suite 330, - Boston, MA 02111-1307 USA - - $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $ -*/ - -#include "wiring_private.h" - -// Define constants and variables for buffering incoming serial data. We're -// using a ring buffer (I think), in which rx_buffer_head is the index of the -// location to which to write the next incoming character and rx_buffer_tail -// is the index of the location from which to read. -#define RX_BUFFER_SIZE 128 - -unsigned char rx_buffer[RX_BUFFER_SIZE]; - -int rx_buffer_head = 0; -int rx_buffer_tail = 0; - -void beginSerial(long baud) -{ -#if defined(__AVR_ATmega8__) - UBRRH = ((F_CPU / 16 + baud / 2) / baud - 1) >> 8; - UBRRL = ((F_CPU / 16 + baud / 2) / baud - 1); - - // enable rx and tx - sbi(UCSRB, RXEN); - sbi(UCSRB, TXEN); - - // enable interrupt on complete reception of a byte - sbi(UCSRB, RXCIE); -#else - UBRR0H = ((F_CPU / 16 + baud / 2) / baud - 1) >> 8; - UBRR0L = ((F_CPU / 16 + baud / 2) / baud - 1); - - // enable rx and tx - sbi(UCSR0B, RXEN0); - sbi(UCSR0B, TXEN0); - - // enable interrupt on complete reception of a byte - sbi(UCSR0B, RXCIE0); -#endif - - // defaults to 8-bit, no parity, 1 stop bit -} - -void serialWrite(unsigned char c) -{ -#if defined(__AVR_ATmega8__) - while (!(UCSRA & (1 << UDRE))) - ; - - UDR = c; -#else - while (!(UCSR0A & (1 << UDRE0))) - ; - - UDR0 = c; -#endif -} - -int serialAvailable() -{ - return (RX_BUFFER_SIZE + rx_buffer_head - rx_buffer_tail) % RX_BUFFER_SIZE; -} - -int serialRead() -{ - // if the head isn't ahead of the tail, we don't have any characters - if (rx_buffer_head == rx_buffer_tail) { - return -1; - } else { - unsigned char c = rx_buffer[rx_buffer_tail]; - rx_buffer_tail = (rx_buffer_tail + 1) % RX_BUFFER_SIZE; - return c; - } -} - -void serialFlush() -{ - // don't reverse this or there may be problems if the RX interrupt - // occurs after reading the value of rx_buffer_head but before writing - // the value to rx_buffer_tail; the previous value of rx_buffer_head - // may be written to rx_buffer_tail, making it appear as if the buffer - // were full, not empty. - rx_buffer_head = rx_buffer_tail; -} - -#if defined(__AVR_ATmega8__) -SIGNAL(SIG_UART_RECV) -#else -SIGNAL(USART_RX_vect) -#endif -{ -#if defined(__AVR_ATmega8__) - unsigned char c = UDR; -#else - unsigned char c = UDR0; -#endif - - int i = (rx_buffer_head + 1) % RX_BUFFER_SIZE; - - // if we should be storing the received character into the location - // just before the tail (meaning that the head would advance to the - // current location of the tail), we're about to overflow the buffer - // and so we don't write the character or advance the head. - if (i != rx_buffer_tail) { - rx_buffer[rx_buffer_head] = c; - rx_buffer_head = i; - } -}
\ No newline at end of file |