52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
/***************************************************************************
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* Copyright (C) 2007 by Pavel Chromy *
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* chromy@asix.cz *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
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***************************************************************************/
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#include "dcc.h"
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/* debug channel read (debugger->MCU) */
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uint32 dcc_rd(void)
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{
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volatile uint32 dcc_reg;
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do {
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asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
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} while ((dcc_reg&1) == 0);
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asm volatile ("mrc p14, 0, %0, C1, C0" : "=r" (dcc_reg) :);
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return dcc_reg;
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}
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/* debug channel write (MCU->debugger) */
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int dcc_wr(uint32 data)
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{
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volatile uint32 dcc_reg;
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do {
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asm volatile ("mrc p14, 0, %0, C0, C0" : "=r" (dcc_reg) :);
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/* operation controled by master, cancel operation
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upon reception of data for immediate response */
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if (dcc_reg&1) return -1;
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} while (dcc_reg&2);
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asm volatile ("mcr p14, 0, %0, C1, C0" : : "r" (data));
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return 0;
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}
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