Revision 184
Pulling out the uart polling code, need to do some file renames
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* Copyright 2009 Kevin Woo <kwoo@2ndt.com> |
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* |
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********/ |
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/** @file uart.h
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/** @file rs485_sw.h
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* |
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* @brief Initializes UART functions using the UART hardware module
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* @brief Implements rs485 using the uart hardware module.
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* |
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* See rs485_sw.c for more information |
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* |
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* @author Kevin Woo (kwoo) |
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*/ |
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#ifndef UART_H
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#define UART_H
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#ifndef _RS485_SW_H
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#define _RS485_SW_H
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#include <avr/io.h> |
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#include <avr/interrupt.h> |
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#include <stdint.h> |
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/** **/ |
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#define UART_TX_OFF 0 |
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#define UART_TX_ON 1 |
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/** @brief RX Pin for the UART **/ |
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#define RS485_TX_OFF 0 |
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#define RS485_TX_ON 1 |
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/** @brief RX Pin for the RS485 */ |
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#define RX _BV(PORTD0) |
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/** @brief TX Pin for the RS485 */ |
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#define TX _BV(PORTD1) |
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/** @brief TX Enable Pin for the RS485 */ |
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#define TX_EN _BV(PORTD5) |
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/** @brief The most recently received byte **/ |
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extern uint8_t received_byte; |
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/** @brief If the value in received_byte has been read or not **/ |
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extern uint8_t byte_ready; |
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/** @brief Initializes the UART registers and sets it to the buad rate |
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* which msut be the value that is defined in the datasheet |
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* for any particular speed (ie: 51 -> 9600bps) |
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**/ |
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void init_uart(uint16_t baud); |
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/** @brief Gets latest byte and returns it in output_byte. If the byte |
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* was already read, returns -1 otherwise it returns 0 |
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**/ |
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void uart_init(uint16_t baud); |
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int8_t uart_get_byte(uint8_t *output_byte); |
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/** @brief Sends a character array of size size. If we are currently |
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* transmitting it will block until the the current transmit |
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* is done. |
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**/ |
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void uart_send_byte(uint8_t data); |
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void uart_toggle_transmit(uint8_t state); |
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static void uart_toggle_transmit(uint8_t state);
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#endif |
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