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dgisselq |
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename: rtcsim.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: Since we lost the real-time clock on board due to space
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// constraints, this unit attempts to replace that functionality
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// in software.
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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 "rtcsim.h"
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unsigned rtcclock, rtcalarm, rtcdate;
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#ifdef ZIPOS
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SEMAPHORE SEMDATE, SEMCLOCK;
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#endif
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unsigned rtcnext(unsigned now) {
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now = now+1;
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if ((now & 0x0f)>=0x0a) {
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now += 0x06; // Seconds
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if ((now & 0x0f0)> 0x050) {
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now += 0x0a0; // Increment minutes
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if ((now & 0x0f00)>= 0x0a00) {
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now += 0x0600;
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if ((now & 0x0f000)> 0x05000) {
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now += 0x0a000; // Increment hours
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if ((now & 0x0f0000)>= 0x0a0000)
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now += 0x060000;
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if (now >= 0x0240000)
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now = 0;
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}
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}
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}
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}
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return now;
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}
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static const int days_per_month[] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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unsigned rtcdatenext(unsigned today) {
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int dy, mo;
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dy = (today&0x0f)+((today>>4)&0x03)*10;
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mo = ((today>>8)&0x0f)+(today&0x0100)?10:0;
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dy = dy+1;
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if ((mo>12)||(dy > days_per_month[mo-1])) {
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if (mo == 2) {
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// If its a leap year
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// If it is divisible by four
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// But not a century year
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// unless it's a fourth century yr
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int tst;
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if ((today&0x0ff0000) == 0) {
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tst = (today >> 24) & 0x03f;
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} else {
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tst = (today >> 20) & 0x0ff;
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} tst &= 0x013;
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if ((tst==0)||(tst==0x012)) {
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// Divisible by four
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if (dy >= 29)
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dy = 1;
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} else dy = 1;
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} else dy = 1;
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} if (dy == 1) {
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// Set to the first day of the month
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today &= (~0x0ff);
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today |= 1;
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mo++;
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if (mo > 12) {
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// Set to the first month of the year
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today &= ~(0x0ff00);
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today |= 0x0100;
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// Increment the year
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today += 0x010000;
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if ((today & 0x0f0000)>=0x0a0000) {
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today += 0x060000;
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if ((today& 0x0f00000)>= 0x0a00000) {
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today += 0x0600000;
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if ((today & 0x0f000000)>= 0x0a000000) {
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today += 0x06000000;
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if ((today & 0x0f0000000)>=0x0a0000000)
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today += 0x060000000;
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}
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}
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}
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}
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} else {
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today += 1;
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if ((today & 0x0f)>=0x0a)
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today += 0x06;
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}
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return today;
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}
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#ifdef ZIPOS
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void rtctask(void) {
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rtcdate = 0x20160430;
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rtctime = 0;
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while(1) {
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unsigned event = wait(SWINT_RTCPPS);
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if (event&INT_TIMA) {
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unsigned v, nextevent = SWINT_PPS;
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semget(SEMCLOCK);
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rtctime = v = rtcnext(rtctime);
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semput(SEMCLOCK);
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if (v == rtcalarm)
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nextevent |= SWINT_ALARM;
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if (v == 0) {
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semget(SEMDATE);
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rtcdate = rtcdatenext(rtcdate);
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semput(SEMDATE);
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nextevent |= SWINT_PPD;
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} swthrow(nextevent);
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}
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}
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}
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#endif
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