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/*
* Copyright 2012 (C) Christian Franke <nobody at nowhere dot ws>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with This program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#define BAUD 38400
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/setbaud.h>
#include <stdint.h>
#include <string.h>
#include "serial.h"
static char output_buffer[512];
static uint16_t output_offset = 0;
static uint16_t output_end = 0;
static char input_buffer[512];
static uint16_t input_end = 0;
static uint8_t verbose = 0;
void serial_send(const char *buffer, uint16_t len, uint8_t urgent)
{
if (!urgent && !verbose)
return;
cli();
if (sizeof(output_buffer) - output_end < len) {
memmove(output_buffer, output_buffer + output_offset, output_end -
output_offset);
output_end -= output_offset;
output_offset = 0;
}
uint16_t size = len;
if (size > sizeof(output_buffer) - output_end)
size = sizeof(output_buffer) - output_end;
memcpy(&output_buffer[output_end], buffer, size);
uint8_t send_needed = output_end == output_offset;
output_end += size;
sei();
if (send_needed) {
output_offset++;
UDR = output_buffer[output_offset - 1];
}
}
ISR(USART_TXC_vect)
{
if (output_end == output_offset)
return;
UDR = output_buffer[output_offset];
output_offset++;
}
ISR(USART_RXC_vect)
{
if (input_end == sizeof(input_buffer))
input_end = 0;
input_buffer[input_end++] = UDR;
input_end -= serial_rx_cb(input_buffer, input_end);
}
void serial_toggle_verbose(void)
{
verbose = 1 - verbose;
}
void serial_init(void)
{
UBRRH = UBRRH_VALUE;
UBRRL = UBRRL_VALUE;
UCSRA = 0x00;
UCSRB = (1 << RXCIE) | (1 << TXCIE) | (1 << RXEN) | (1 << TXEN);
UCSRC = (1 << URSEL) | (1 << UCSZ1) | (1 << UCSZ0);
}
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