Revision 211
broken cardbox, needs to fix the statemachine
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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.c
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/** @file rs485_int.c
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* |
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* @brief Implements UART functionality in hardware |
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* |
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* @author Kevin Woo (kwoo) |
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*/ |
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#include "uart.h"
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#include "rs485_int.h"
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#include <util/delay.h> |
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#include <stdint.h> |
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uint8_t received_byte; //Byte received |
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uint8_t byte_ready; //New byte has been received |
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void init_uart(uint16_t baud) {
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void rs485_init(uint16_t baud) {
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// Set baud rate |
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UBRRH = (uint8_t)(baud>>8); |
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UBRRL = (uint8_t)baud; |
| ... | ... | |
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// Initialize receive variables |
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byte_ready = 0; |
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received_byte = 0x0; |
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// Set to receive mode |
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rs485_toggle_transmit(TX_OFF); |
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} |
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int8_t uart_get_byte(uint8_t *output_byte) {
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int8_t rs485_get_byte(uint8_t *output_byte) {
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if (byte_ready) {
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byte_ready = 0; |
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*output_byte = received_byte; |
| ... | ... | |
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} |
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} |
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void uart_send_byte(uint8_t data) {
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void rs485_send_byte(uint8_t data) {
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//Waits until current transmit is done |
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while (!(UCSRA & _BV(UDRE))); |
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// Enable writes and send |
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uart_toggle_transmit(UART_TX_ON);
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rs485_toggle_transmit(UART_TX_ON);
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UDR = data; |
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return; |
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} |
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void uart_toggle_transmit(uint8_t state) {
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void rs485_toggle_transmit(uint8_t state) {
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if (state == UART_TX_ON) {
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PORTD |= TX_EN; |
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} else {
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| ... | ... | |
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ISR(USART_TX_vect) {
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// Re-enable reads |
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uart_toggle_transmit(UART_TX_OFF);
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rs485_toggle_transmit(UART_TX_OFF);
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} |
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