92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
/*
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* Copyright © 2008 Keith Packard <keithp@keithp.com>
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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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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sfr at 0x80 P0;
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sfr at 0x90 P1;
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sfr at 0xA0 P2;
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sfr at 0xC6 CLKCON;
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sfr at 0xF1 PERCFG;
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sfr at 0xF2 ADCCFG;
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sfr at 0xF3 P0SEL;
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sfr at 0xF4 P1SEL;
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sfr at 0xF5 P2SEL;
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sfr at 0xFD P0DIR;
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sfr at 0xFE P1DIR;
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sfr at 0xFF P2DIR;
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sfr at 0x8F P0INP;
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sfr at 0xF6 P1INP;
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sfr at 0xF7 P2INP;
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sfr at 0x89 P0IFG;
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sfr at 0x8A P1IFG;
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sfr at 0x8B P2IFG;
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#define nop() _asm nop _endasm;
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void
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delay (unsigned char n)
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{
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unsigned char i = 0;
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n <<= 1;
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while (--n != 0) {
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i = 211;
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while (--i != 0)
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nop();
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}
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}
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void
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tone (unsigned char n, unsigned char m)
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{
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unsigned char i = 0;
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while (--m != 0) {
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while (--i != 0) {
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P2 = 0xff;
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delay(n);
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P2 = 0xfe;
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delay(n);
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}
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}
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}
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void
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high() {
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tone(1, 2);
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}
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void
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low() {
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tone(2, 1);
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}
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main ()
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{
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CLKCON = 0;
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/* Set P2_0 to output */
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P2DIR = 0x01;
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P1INP = 0x00;
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P2INP = 0x00;
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for (;;) {
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high();
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/* low(); */
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}
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}
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