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[/] [amber/] [trunk/] [sw/] [boot-loader-ethmac/] [timer.c] - Rev 78
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/*---------------------------------------------------------------- // // // boot-loader-ethmac.c // // // // This file is part of the Amber project // // http://www.opencores.org/project,amber // // // // Description // // The main functions for the boot loader application. This // // application is embedded in the FPGA's SRAM and is used // // to load larger applications into the DDR3 memory on // // the development board. // // // // Author(s): // // - Conor Santifort, csantifort.amber@gmail.com // // // ////////////////////////////////////////////////////////////////// // // // Copyright (C) 2011 Authors and OPENCORES.ORG // // // // This source file may be used and distributed without // // restriction provided that this copyright statement is not // // removed from the file and that any derivative work contains // // the original copyright notice and the associated disclaimer. // // // // This source file is free software; you can redistribute it // // and/or modify it under the terms of the GNU Lesser General // // Public License as published by the Free Software Foundation; // // either version 2.1 of the License, or (at your option) any // // later version. // // // // This source is distributed in the hope that it will be // // useful, but WITHOUT ANY WARRANTY; without even the implied // // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR // // PURPOSE. See the GNU Lesser General Public License for more // // details. // // // // You should have received a copy of the GNU Lesser General // // Public License along with this source; if not, download it // // from http://www.opencores.org/lgpl.shtml // // // ----------------------------------------------------------------*/ #include "amber_registers.h" #include "utilities.h" #include "timer.h" /* Global variable for the current time */ time_t* current_time_g; time_t* init_timer() { time_t* timer; timer= malloc(sizeof(time_t)); timer->milliseconds = 0; timer->seconds = 0; return timer; } /*Initialize a global variable that keeps track of the current up time. Timers are compared against this running value. */ void init_current_time() { /* Configure timer 0 */ /* Counts down from this value and generates an interrupt every 1/100 seconds */ *(unsigned int *) ( ADR_AMBER_TM_TIMER0_LOAD ) = 1562; // 16-bit, x 256 *(unsigned int *) ( ADR_AMBER_TM_TIMER0_CTRL ) = 0xc8; // enable[7], periodic[6], /* Enable timer 0 interrupt */ *(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLESET ) = 0x020; current_time_g = malloc(sizeof(time_t)); current_time_g->milliseconds = 0; current_time_g->seconds = 0; } void timer_interrupt() { /* Clear timer 0 interrupt in timer */ *(unsigned int *) ( ADR_AMBER_TM_TIMER0_CLR ) = 1; /* Disable timer 0 interrupt in interrupt controller */ *(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLECLR ) = 0x020; /* Update the global current_time variable */ if (current_time_g->milliseconds == 990) { current_time_g->milliseconds = 0; current_time_g->seconds++; } else { current_time_g->milliseconds+=10; } /* Enable timer 0 interrupt in interrupt controller */ *(unsigned int *) ( ADR_AMBER_IC_IRQ0_ENABLESET ) = 0x020; } /* Return true if timer has expired */ int timer_expired(time_t * expiry_time) { if (!expiry_time->seconds && !expiry_time->milliseconds) /* timer is not set */ return 0; else if (expiry_time->seconds < current_time_g->seconds) return 1; else if ((expiry_time->seconds == current_time_g->seconds) && (expiry_time->milliseconds < current_time_g->milliseconds)) return 1; else return 0; } /* Set the timer to current time plus 5 seconds */ void set_timer (time_t* timer, int milliseconds) { int seconds = _div(milliseconds, 1000); int mseconds = milliseconds - seconds*1000; /* milliseconds % 1000 */ if (current_time_g->milliseconds >= (1000 - mseconds)) { timer->seconds = current_time_g->seconds + 1; timer->milliseconds = current_time_g->milliseconds + mseconds - 1000; } else { timer->seconds = current_time_g->seconds; timer->milliseconds = current_time_g->milliseconds + mseconds; } timer->seconds += seconds; }
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