at91_dbgu.c

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00001 /*
00002  * Copyright (C) 2001-2006 by egnite Software GmbH
00003  * Copyright (C) 2010 by egnite GmbH
00004  *
00005  * All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  *
00011  * 1. Redistributions of source code must retain the above copyright
00012  *    notice, this list of conditions and the following disclaimer.
00013  * 2. Redistributions in binary form must reproduce the above copyright
00014  *    notice, this list of conditions and the following disclaimer in the
00015  *    documentation and/or other materials provided with the distribution.
00016  * 3. Neither the name of the copyright holders nor the names of
00017  *    contributors may be used to endorse or promote products derived
00018  *    from this software without specific prior written permission.
00019  *
00020  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00021  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00022  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00023  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
00024  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00025  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00026  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00027  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00028  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00029  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00030  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00031  * SUCH DAMAGE.
00032  *
00033  * For additional information see http://www.ethernut.de/
00034  */
00035 
00045 #include <cfg/uart.h>
00046 #include <arch/arm/debug_at91.h>
00047 
00048 #if defined(DBGU_BASE)
00049 
00054 
00055 #ifndef NUT_DEV_DEBUG_SPEED
00056 #ifdef UARTD_INIT_BAUDRATE
00057 #define NUT_DEV_DEBUG_SPEED UARTD_INIT_BAUDRATE
00058 #else
00059 #define NUT_DEV_DEBUG_SPEED 115200
00060 #endif
00061 #endif
00062 
00068 static int DebugInit(NUTDEVICE * dev)
00069 {
00070     /* Disable GPIO on UART tx/rx pins. */
00071 #if defined (PA9_DRXD_A) && defined (PA10_DTXD_A)
00072     outr(PIOA_PDR, _BV(PA9_DRXD_A) | _BV(PA10_DTXD_A));
00073 #elif defined (PA27_DRXD_A) && defined (PA28_DTXD_A)
00074     outr(PIOA_PDR, _BV(PA27_DRXD_A) | _BV(PA28_DTXD_A));
00075 #endif
00076     /* Reset UART. */
00077     outr(DBGU_CR, US_RSTRX | US_RSTTX | US_RXDIS | US_TXDIS);
00078     /* Disable all UART interrupts. */
00079     outr(DBGU_IDR, 0xFFFFFFFF);
00080 #if NUT_DEV_DEBUG_SPEED
00081     /* Set UART baud rate generator register. */
00082     outr(DBGU_BRGR, At91BaudRateDiv(NUT_DEV_DEBUG_SPEED));
00083 #endif
00084     /* Set UART mode to 8 data bits, no parity and 1 stop bit. */
00085     outr(DBGU_MR, US_CHMODE_NORMAL | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1);
00086     /* Enable UART receiver and transmitter. */
00087     outr(DBGU_CR, US_RXEN | US_TXEN);
00088 
00089     return 0;
00090 }
00091 
00092 static NUTFILE dbgfile;
00093 
00097 NUTDEVICE devDebug = {
00098     0,                          
00099     {'d', 'b', 'g', 'u', 0, 0, 0, 0, 0}
00100     ,                           
00101     0,                          
00102     DBGU_BASE,                  
00103     0,                          
00104     0,                          
00105     &dbgfile,                   
00106     DebugInit,                  
00107     At91DevDebugIOCtl,          
00108     0,                          
00109     At91DevDebugWrite,          
00110     At91DevDebugOpen,           
00111     At91DevDebugClose,          
00112     0                           
00113 };
00114 
00115 #endif /* DBGU_BASE */
00116 

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