| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2008 by Rob Purchase |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "kernel.h" |
| #include "timer.h" |
| #include "thread.h" |
| |
| void tick_start(unsigned int interval_in_ms) |
| { |
| /* configure Timer T-Clock to 2Mhz (clock source 4 (Xin) divided by 6) */ |
| PCLKCFG4 = (1 << 31) | (4 << 28) | (5 << 16); |
| |
| /* disable Timer0 */ |
| TCFG0 &= ~1; |
| |
| /* set counter reference value based on 1Mhz tick */ |
| TREF0 = interval_in_ms * 1000; |
| |
| /* Timer0 = reset to 0, divide=2, IRQ enable, enable (continuous) */ |
| TCFG0 = (1<<8) | (0<<4) | (1<<3) | 1; |
| |
| /* Unmask timer IRQ */ |
| IEN |= TIMER0_IRQ_MASK; |
| } |
| |
| /* NB: Since we are using a single timer IRQ, tick tasks are dispatched as |
| part of the central timer IRQ processing in timer-tcc77x.c */ |