ft245_mem.c

/*! \file ft245.c \brief FTDI FT245 USB Inferface Driver Library. */
//*****************************************************************************
//
// File Name    : 'ft245.c'
// Title        : FTDI FT245 USB Inferface Driver Library
// Author       : Pascal Stang - Copyright (C) 2004
// Created      : 2004.02.10
// Revised      : 2004.02.19
// Version      : 0.1
// Target MCU   : Atmel AVR Series
// Editor Tabs  : 4
//
// NOTE: This code is currently below version 1.0, and therefore is considered
// to be lacking in some functionality or documentation, or may not be fully
// tested.  Nonetheless, you can expect most functions to work.
//
// This code is distributed under the GNU Public License
//      which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

#include "lpc2000.h"
//#include <avr/io.h>
//#include <avr/signal.h>
//#include <avr/interrupt.h>

#include "global.h"
#include "timer.h"
#include "ft245.h"

#include "mem.h"

#define FT245_REG_CTRL      (*((volatile u08*)(MEMBANK0+0x006)))
#define FT245_REG_DATA      (*((volatile u08*)(MEMBANK0+0x008)))
#define FT245_REG_CTRL_RXF  1
#define FT245_REG_CTRL_TXE  2

// global variables
static char ft245RxData[FT245_RX_BUFFER_SIZE];
cBuffer ft245RxBuffer;

// Functions
void ft245Init(void)
{
    // initialize the RX buffer
    bufferInit(&ft245RxBuffer, ft245RxData, FT245_RX_BUFFER_SIZE);

    // reset the FT245
    //ft245Reset();
}

u08 ft245ReadByte(void)
{
    return FT245_REG_DATA;
}

void ft245WriteByte(u08 data)
{
    FT245_REG_DATA = data;
}

u08 ft245CheckRxFifo(void)
{
    // check state of RXF line
    // RXF = L  => Data in fifo ready to be read
    // RXF = H  => No data, or not ready
    if(FT245_REG_CTRL & FT245_REG_CTRL_RXF)
        return FALSE;   // no data
    else
        return TRUE;    // data is available
}

u08 ft245CheckTxFifo(void)
{
    // check state of TXE line
    // TXE = L  => Tx fifo is ready to be written
    // TXE = H  => Tx fifo full or not ready
    if(FT245_REG_CTRL & FT245_REG_CTRL_TXE)
        return FALSE;   // full or not ready
    else
        return TRUE;    // tx fifo space is available
}

void ft245SendByte(u08 data)
{
    // wait for FT245 to become ready
    while(!ft245CheckTxFifo());
    // send byte
    ft245WriteByte(data);
}

cBuffer* ft245GetRxBuffer(void)
{
    // since there is an internal buffer in the FT245 chip
    // we don't read in bytes immediately on reception.
    // instead, the FT245 buffer is read in when the 
    // receive buffer is requested

    // read in receive buffer
    while(ft245CheckRxFifo())
    {
        bufferAddToEnd(&ft245RxBuffer, ft245ReadByte());
    }

    return &ft245RxBuffer;
}

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