From 583f00e0b8efe2832f63efb478a51d3ad35e92ed Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Sun, 7 Oct 2007 22:16:03 +0200 Subject: Included SI2E avr modules. Well, this need more works... --- digital/avr/modules/utils/test/test_byte_methods.c | 67 ++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 digital/avr/modules/utils/test/test_byte_methods.c (limited to 'digital/avr/modules/utils/test/test_byte_methods.c') diff --git a/digital/avr/modules/utils/test/test_byte_methods.c b/digital/avr/modules/utils/test/test_byte_methods.c new file mode 100644 index 00000000..adf6d05e --- /dev/null +++ b/digital/avr/modules/utils/test/test_byte_methods.c @@ -0,0 +1,67 @@ +/* test_byte.c */ +/* n.avr.utils - AVR utilities module. {{{ + * + * Copyright (C) 2005 Nicolas Schodet + * + * Robot APB Team/Efrei 2005. + * Web: http://assos.efrei.fr/robot/ + * Email: robot AT efrei DOT fr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * }}} */ +#include "common.h" +#include "io.h" + +/* +AutoDec */ +/* -AutoDec */ + +#define nop() asm volatile ("nop" ::) + +/* Union for byte access. */ +union _utils_byte_access +{ + uint8_t v8[4]; + uint16_t v16[2]; + uint32_t v32; +}; + +int +main (void) +{ + union _utils_byte_access ba; + volatile uint32_t d = 0; + volatile uint8_t b0 = 1, b1 = 2, b2 = 3, b3 = 4; + nop (); // join union method. + ba.v8[0] = b0; ba.v8[1] = b1; ba.v8[2] = b2; ba.v8[3] = b3; + d = ba.v32; + nop (); // join asm method. + asm ("mov %A0, %1" "\r\n" + "mov %B0, %2" "\r\n" + "mov %C0, %3" "\r\n" + "mov %D0, %4" "\r\n" + : "=d" (d) : "r" (b0), "r" (b1), "r" (b2), "r" (b3)); + nop (); // split union method. + ba.v32 = d; + b2 = ba.v8[2]; + nop (); // split asm method. + asm ("mov %0, %A1" : "=r" (b2) : "d" (d)); + nop (); // b2 = d >> 16; + b2 = d >> 16; + nop (); // b2 = ((uint8_t *) &d)[2]; + b2 = ((uint8_t *) &d)[2]; + nop (); + return 0; +} -- cgit v1.2.3