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csantifort |
/*----------------------------------------------------------------
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// //
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// boot-loader-ethmac.c //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// The main functions for the boot loader application. This //
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// application is embedded in the FPGA's SRAM and is used //
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// to load larger applications into the DDR3 memory on //
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// the development board. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2011 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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----------------------------------------------------------------*/
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#include "amber_registers.h"
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#include "utilities.h"
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#include "timer.h"
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/* Global variable for the current time */
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time_t* current_time_g;
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time_t* init_timer()
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{
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time_t* timer;
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timer= malloc(sizeof(time_t));
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timer->milliseconds = 0;
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timer->seconds = 0;
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return timer;
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}
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/*Initialize a global variable that keeps
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track of the current up time. Timers are
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compared against this running value.
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*/
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void init_current_time()
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{
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/* Configure timer 0 */
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/* Counts down from this value and generates an interrupt every 1/100 seconds */
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*(unsigned int *) ( ADR_AMBER_TM_TIMER0_LOAD ) = 1562; // 16-bit, x 256
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*(unsigned int *) ( ADR_AMBER_TM_TIMER0_CTRL ) = 0xc8; // enable[7], periodic[6],
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/* Enable timer 0 interrupt */
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*(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLESET ) = 0x020;
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current_time_g = malloc(sizeof(time_t));
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current_time_g->milliseconds = 0;
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current_time_g->seconds = 0;
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}
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void timer_interrupt()
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{
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/* Clear timer 0 interrupt in timer */
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*(unsigned int *) ( ADR_AMBER_TM_TIMER0_CLR ) = 1;
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/* Disable timer 0 interrupt in interrupt controller */
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*(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLECLR ) = 0x020;
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/* Update the global current_time variable */
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if (current_time_g->milliseconds == 990) {
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current_time_g->milliseconds = 0;
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current_time_g->seconds++;
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}
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else {
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current_time_g->milliseconds+=10;
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}
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/* Enable timer 0 interrupt in interrupt controller */
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*(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLESET ) = 0x020;
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}
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/* Return true if timer has expired */
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int timer_expired(time_t * expiry_time)
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{
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if (!expiry_time->seconds && !expiry_time->milliseconds)
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/* timer is not set */
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return 0;
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else if (expiry_time->seconds < current_time_g->seconds)
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return 1;
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else if ((expiry_time->seconds == current_time_g->seconds) &&
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(expiry_time->milliseconds < current_time_g->milliseconds))
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return 1;
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else
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return 0;
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}
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/* Set the timer to current time plus 5 seconds */
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void set_timer (time_t* timer, int milliseconds)
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{
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int seconds = _div(milliseconds, 1000);
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int mseconds = milliseconds - seconds*1000; /* milliseconds % 1000 */
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if (current_time_g->milliseconds >= (1000 - mseconds)) {
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timer->seconds = current_time_g->seconds + 1;
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timer->milliseconds = current_time_g->milliseconds + mseconds - 1000;
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}
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else {
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timer->seconds = current_time_g->seconds;
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timer->milliseconds = current_time_g->milliseconds + mseconds;
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}
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timer->seconds += seconds;
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}
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