debug0.c

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/*
 * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 *
 */

#include <dev/debug.h>

#include <cfg/os.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/timer.h>


static NUTFILE dbgfile;

static int DebugIOCtl(NUTDEVICE * dev, int req, void *conf)
{
    if(req == UART_SETSPEED) {
#if defined(__AVR_ENHANCED__) && ((NUT_CPU_FREQ == 12000000) || (NUT_CPU_FREQ == 16000000))
        /* On enhanced MCUs with 12.0 or 16.0 MHz we use double rate mode,
         * so we can use 115200 bps with 12.0 MHz crystals
         * and 57600 with 16.0 MHz crystals.
         */
        sbi(UCSR0A, U2X0);
        outb(UBRR, (uint8_t) ((((2UL * NutGetCpuClock()) / (*((uint32_t *)conf) * 8UL)) + 1UL) / 2UL) - 1UL);
#else
        outb(UBRR, (uint8_t) ((((2UL * NutGetCpuClock()) / (*((uint32_t *)conf) * 16UL)) + 1UL) / 2UL) - 1UL);
#endif
        return 0;
    }
    return -1;
}

static int DebugInit(NUTDEVICE * dev)
{
    /* Note: Default baudrate has been set in nutinit.c */
    UCR = BV(RXEN) | BV(TXEN);
    return 0;
}

static void DebugPut(char ch)
{
    if(ch == '\n') {
            while((USR & BV(UDRE)) == 0);
            UDR = '\r';
    }
    while((USR & BV(UDRE)) == 0);
    UDR = ch;
}

static int DebugWrite(NUTFILE * fp, CONST void *buffer, int len)
{
    int c = len;
    CONST char *cp = buffer;

    while(c--)
        DebugPut(*cp++);
    return len;
}

static int DebugWrite_P(NUTFILE * fp, PGM_P buffer, int len)
{
    int c = len;
    PGM_P cp = buffer;

    while(c--) {
        DebugPut(PRG_RDB(cp));
        cp++;
    }
    return len;
}

static NUTFILE *DebugOpen(NUTDEVICE * dev, CONST char *name, int mode, int acc)
{
    dbgfile.nf_next = 0;
    dbgfile.nf_dev = dev;
    dbgfile.nf_fcb = 0;

    return &dbgfile;
}

static int DebugClose(NUTFILE * fp)
{
    return 0;
}

NUTDEVICE devDebug0 = {
    0,                          
    {'u', 'a', 'r', 't', '0', 0, 0, 0, 0},      
    0,                          
    0,                          
    0,                          
    0,                          
    0,                          
    DebugInit,                  
    DebugIOCtl,                 
    0,
    DebugWrite,
    DebugWrite_P,
    DebugOpen,
    DebugClose,
    0
};