pwm.c

00001 /*
00002  * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
00003  * to the MC1322x project (http://mc1322x.devl.org)
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. Neither the name of the Institute nor the names of its contributors
00015  *    may be used to endorse or promote products derived from this software
00016  *    without specific prior written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00019  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00022  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00023  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00024  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00025  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00026  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00027  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * This file is part of libmc1322x: see http://mc1322x.devl.org
00031  * for details.
00032  *
00033  *
00034  */
00035 
00036 #include <mc1322x.h>
00037 #include <board.h>
00038 #include <stdio.h>
00039 
00040 #include "config.h"
00041 #include "pwm.h"
00042 #include "rtc.h"
00043 
00044 int main(void) 
00045 {
00046         int x = 32768;
00047         
00048         trim_xtal();
00049         uart1_init(INC,MOD,SAMP);
00050         rtc_init();
00051         
00052         printf("pwm test\r\n");
00053         pwm_init_stopped(TMR0, 12000000, x);
00054         pwm_init_stopped(TMR1, 12000000, x);
00055         TMR0->ENBL |= TMR_ENABLE_BIT(TMR0) | TMR_ENABLE_BIT(TMR1);
00056 
00057         for(;;) {
00058                 printf("duty %d = %d%%\r\n", x, ((x * 100 + 32768) / 65536));
00059                 switch(uart1_getc()) {
00060                 case '[': x -= 1; break;
00061                 case ']': x += 1; break;
00062                 case '-': x -= 32; break;
00063                 case '=': x += 32; break;
00064                 case '_': x -= 512; break;
00065                 case '+': x += 512; break;
00066 
00067                 case '`': x = 65535 * 0/10; break;
00068                 case '1': x = 65535 * 1/10; break;
00069                 case '2': x = 65535 * 2/10; break;
00070                 case '3': x = 65535 * 3/10; break;
00071                 case '4': x = 65535 * 4/10; break;
00072                 case '5': x = 65535 * 5/10; break;
00073                 case '6': x = 65535 * 6/10; break;
00074                 case '7': x = 65535 * 7/10; break;
00075                 case '8': x = 65535 * 8/10; break;
00076                 case '9': x = 65535 * 9/10; break;
00077                 case '0': x = 65535 * 10/10; break;
00078 
00079                 }
00080                 x &= 65535;
00081                 pwm_duty(TMR0, x);
00082         }
00083 }
00084 
00085 

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