root / trunk / cardbox / rs485_int.h @ 206
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1 | 139 | kwoo | /********
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2 | * This file is part of Tooltron.
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3 | *
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4 | * Tooltron is free software: you can redistribute it and/or modify
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5 | * it under the terms of the Lesser GNU General Public License as published by
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6 | * the Free Software Foundation, either version 3 of the License, or
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7 | * (at your option) any later version.
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8 | *
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9 | * Tooltron is distributed in the hope that it will be useful,
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 | * Lesser GNU General Public License for more details.
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13 | * You should have received a copy of the Lesser GNU General Public License
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14 | * along with Tooltron. If not, see <http://www.gnu.org/licenses/>.
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15 | *
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16 | * Copyright 2009 Kevin Woo <kwoo@2ndt.com>
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17 | *
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18 | ********/
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19 | 8 | kwoo | /** @file uart.h
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20 | *
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21 | * @brief Initializes UART functions using the UART hardware module
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22 | *
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23 | * @author Kevin Woo (kwoo)
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24 | */
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25 | |||
26 | #ifndef UART_H
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27 | #define UART_H
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28 | |||
29 | #include <avr/io.h> |
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30 | #include <avr/interrupt.h> |
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31 | 109 | kwoo | #include <stdint.h> |
32 | 13 | kwoo | /** **/
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33 | #define UART_TX_OFF 0 |
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34 | #define UART_TX_ON 1 |
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35 | |||
36 | /** @brief RX Pin for the UART **/
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37 | 109 | kwoo | #define RX _BV(PORTD0)
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38 | #define TX _BV(PORTD1)
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39 | #define TX_EN _BV(PORTD5)
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40 | 8 | kwoo | |
41 | 206 | kwoo | /**
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42 | * @brief This si the value to pass into UBRR tos et the baudrate.
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43 | * @note this assumes an 8MHz system clock
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44 | */
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45 | #define BAUD9600 51 |
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46 | |||
47 | 13 | kwoo | /** @brief The most recently received byte **/
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48 | 109 | kwoo | extern uint8_t received_byte;
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49 | /** @brief If the value in received_byte has been read or not **/
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50 | extern uint8_t byte_ready;
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51 | 8 | kwoo | |
52 | 109 | kwoo | /** @brief Initializes the UART registers and sets it to the buad rate
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53 | * which msut be the value that is defined in the datasheet
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54 | * for any particular speed (ie: 51 -> 9600bps)
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55 | 13 | kwoo | **/
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56 | 109 | kwoo | void init_uart(uint16_t baud);
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57 | /** @brief Gets latest byte and returns it in output_byte. If the byte
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58 | * was already read, returns -1 otherwise it returns 0
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59 | 13 | kwoo | **/
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60 | 109 | kwoo | int8_t uart_get_byte(uint8_t *output_byte); |
61 | /** @brief Sends a character array of size size. If we are currently
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62 | * transmitting it will block until the the current transmit
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63 | * is done.
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64 | **/
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65 | void uart_send_byte(uint8_t data);
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66 | void uart_toggle_transmit(uint8_t state);
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67 | 8 | kwoo | #endif |