/* * Name: serial.h * Project: AVR-Doper * Author: Christian Starkjohann <cs@obdev.at> * Creation Date: 2006-07-10 * Tabsize: 4 * Copyright: (c) 2006 by Christian Starkjohann, all rights reserved. * License: Proprietary, see documentation. * Revision: $Id: serial.h 223 2006-07-18 09:28:13Z cs $ *//*General Description:This module implements a ring buffer for receiving UART data, an interrupthandler to fill this ring buffer with received data and an interface toread data from the ring buffer.*/#ifndef __serial_h_included__#define __serial_h_included__#include "hardware.h"   /* for F_CPU */#include "utils.h"      /* for uchar etc *//* Set the buffer size so that we have at least ~ 100 bytes for the stack! */#define SERIAL_BUFFER_SIZE  200/* ------------------------------------------------------------------------- *//* ------------------- simple ring buffer implementation ------------------- *//* ------------------------------------------------------------------------- */typedef struct ringBuffer{    uchar   readIndex;    uchar   writeIndex;    uchar   buffer[SERIAL_BUFFER_SIZE];}ringBuffer_t;extern ringBuffer_t serialRingBuffer;/* ------------------------------------------------------------------------- */static inline void  ringBufferWrite(ringBuffer_t *rb, uchar c){uchar   newWriteIndex = rb->writeIndex + 1;    if(newWriteIndex >= SERIAL_BUFFER_SIZE)        newWriteIndex = 0;    if(newWriteIndex != rb->readIndex){ /* not yet full */        rb->buffer[rb->writeIndex] = c;        rb->writeIndex = newWriteIndex;    }}static inline uchar ringBufferHasData(ringBuffer_t *rb){    return rb->readIndex != rb->writeIndex;}static inline uchar ringBufferCount(ringBuffer_t *rb){uchar   x = rb->writeIndex - rb->readIndex;    if(rb->writeIndex >= rb->readIndex)        return x;    return x + SERIAL_BUFFER_SIZE;}static inline uchar ringBufferRead(ringBuffer_t *rb){    uchar c = rb->buffer[rb->readIndex];    rb->readIndex++;    if(rb->readIndex >= SERIAL_BUFFER_SIZE)        rb->readIndex = 0;    return c;}/* ------------------------------------------------------------------------- */static inline void  serialInit(void){    UBRRL = F_CPU / (HW_DEBUG_BAUDRATE * 16L) - 1;    UCSRB = (1 << TXEN) | (1 << RXEN) | (1 << RXCIE);   /* enable rx, tx and rx interrupt */}static inline void  serialPutc(uchar c){    while(!(UCSRA & (1 << UDRE)));    /* wait for data register empty */    UDR = c;}#endif /* __serial_h_included__ */