bluebox

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/* BlueDataDistributor - data distribution module from ethernet to 32 serial ports
 * version 0.1.1 date 2006-10-07
 * Copyright (C) 2006 Stefan Schuermans <stefan@blinkenarea.org>
 * a BlinkenArea project - http://www.blinkenarea.org/
 */
#include <string.h>
#include <avr/io.h>
#include "serial.h"
#include "status.h"
// ring buffer for serial data to output on the serial ports
//  - every element contains SERIAL_OUTPUT_CNT bytes
#define SERIAL_BUFFER_CNT 32
unsigned char SerialBuffers[SERIAL_BUFFER_CNT][SERIAL_OUTPUT_CNT];
// pointers for above ring buffer
volatile unsigned char SerialBufferStart = 0;
volatile unsigned char SerialBufferEnd = 0;
// bit mask of next bit to output (0x00 for start bit, 0xFF for stop bit)
volatile unsigned char SerialBitMask = 0x00;
// initialize
void SerialInit( void ) // (extern)
{
    //set up IO pins of serial outputs as output
    PORTB |= 0xFD; // PB1 is used for programming
    DDRB |= 0xFD;
    PORTD = 0xFF;
    DDRD = 0xFF;
    PORTE |= 0xEC; // PE0-1 are used for programming, PE4 is interrupt input
    DDRE |= 0xEC;
    PORTF = 0xFF;
    DDRF = 0xFF;
    PORTG |= 0x17; // PG3 is status LED, PG5-7 do not exist
    DDRG |= 0x17;
}
// output the specified bit of a byte on every serial port
//  - data must point to SERIAL_OUTPUT_CNT=32 bytes
//  - bit_mask must be 0x01, 0x02, ... 0x80 for bits 0, 1, ..., 7
//  - bit_mask must be 0x00 for the start bit and 0xFF for the stop bit
// extern void SerialOutputBit( unsigned char * data, unsigned char bit_mask );
// this function is written in assembler, see serial_asm.S
// bit time of serial port elapsed
void SerialOutputBitTime( void )
{
  unsigned char start;
  // no data to output
 
 
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