| Dave Chapman | f204298 | 2008-05-02 19:12:09 +0000 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * __________ __ ___. |
| 3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| 4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| 5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| 6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| 7 | * \/ \/ \/ \/ \/ |
| 8 | * $Id$ |
| 9 | * |
| 10 | * Copyright (C) 2008 by Rob Purchase |
| 11 | * |
| Daniel Stenberg | 2acc0ac | 2008-06-28 18:10:04 +0000 | [diff] [blame^] | 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version 2 |
| 15 | * of the License, or (at your option) any later version. |
| Dave Chapman | f204298 | 2008-05-02 19:12:09 +0000 | [diff] [blame] | 16 | * |
| 17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 18 | * KIND, either express or implied. |
| 19 | * |
| 20 | ****************************************************************************/ |
| 21 | |
| 22 | #include "config.h" |
| 23 | #include "system.h" |
| 24 | #include "kernel.h" |
| 25 | #include "timer.h" |
| 26 | #include "thread.h" |
| 27 | |
| 28 | void tick_start(unsigned int interval_in_ms) |
| 29 | { |
| 30 | /* configure Timer T-Clock to 2Mhz (clock source 4 (Xin) divided by 6) */ |
| 31 | PCLKCFG4 = (1 << 31) | (4 << 28) | (5 << 16); |
| 32 | |
| 33 | /* disable Timer0 */ |
| 34 | TCFG0 &= ~1; |
| 35 | |
| 36 | /* set counter reference value based on 1Mhz tick */ |
| 37 | TREF0 = interval_in_ms * 1000; |
| 38 | |
| 39 | /* Timer0 = reset to 0, divide=2, IRQ enable, enable (continuous) */ |
| 40 | TCFG0 = (1<<8) | (0<<4) | (1<<3) | 1; |
| 41 | |
| 42 | /* Unmask timer IRQ */ |
| 43 | IEN |= TIMER0_IRQ_MASK; |
| 44 | } |
| 45 | |
| 46 | /* NB: Since we are using a single timer IRQ, tick tasks are dispatched as |
| 47 | part of the central timer IRQ processing in timer-tcc77x.c */ |