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dgisselq |
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename: doorbell.c
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//
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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//
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// Purpose: To test the PWM device by playing a doorbell sound every five
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// seconds.
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// 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 WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// 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. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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#include "asmstartup.h"
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#include "board.h"
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#include "samples.c"
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const char msg[] = "Doorbell!\r\n\r\n";
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void entry(void) {
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register IOSPACE *sys = (IOSPACE *)0x0100;
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sys->io_timb = 0;
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sys->io_pic = 0x07fffffff; // Acknowledge and turn off all interrupts
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sys->io_spio = 0x0f4;
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sys->io_pwm_audio = 0x0110000;
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while(1) {
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int seconds = 0, pic;
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const int *ptr;
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const char *mptr = msg;
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sys->io_tima = TM_ONE_SECOND | TM_REPEAT; // Ticks per second, 80M
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sys->io_spio = 0x0f0;
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ptr = sound_data;
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sys->io_pwm_audio = 0x0310000;
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if (ptr == sound_data)
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sys->io_spio = 0x0f1;
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while(ptr < &sound_data[NSAMPLE_WORDS]) {
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sys->io_spio = 0x022;
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do {
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pic = sys->io_pic;
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if (pic & INT_TIMA)
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seconds++;
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if ((pic & INT_UARTTX)&&(*mptr))
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sys->io_uart = *mptr++;
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sys->io_pic = (pic & 0x07fff);
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} while((pic & INT_AUDIO)==0);
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sys->io_pwm_audio = (*ptr >> 16)&0x0ffff;
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// Now, turn off the audio interrupt since it doesn't
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// reset itself ...
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sys->io_pic = INT_AUDIO;
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do {
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pic = sys->io_pic;
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if (pic & INT_TIMA)
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seconds++;
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if ((pic & INT_UARTTX)&&(*mptr))
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sys->io_uart = *mptr++;
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sys->io_pic = (pic & 0x07fff);
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} while((pic & INT_AUDIO)==0);
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sys->io_pwm_audio = (*ptr++) & 0x0ffff;
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// and turn off the audio interrupt again ...
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sys->io_pic = INT_AUDIO;
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} if (ptr >= &sound_data[NSAMPLE_WORDS])
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sys->io_spio = 0x044;
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sys->io_spio = 0x088;
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sys->io_pwm_audio = 0;
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while(seconds < 10) {
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pic = sys->io_pic;
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if (pic & INT_TIMA)
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seconds++;
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sys->io_pic = (pic & 0x07fff);
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}
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sys->io_spio = 0x0ff;
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}
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}
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