From 1d3861ef93f8423176c6010ab606abdab00a7cbd Mon Sep 17 00:00:00 2001 From: bnewbold Date: Wed, 31 Mar 2010 08:52:45 +0800 Subject: Major hierarchy reorganization; see README. copy-to-ide and Makefile updated to conform; .gitignore added; LICENSE added --- libmaple/systick.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 libmaple/systick.c (limited to 'libmaple/systick.c') diff --git a/libmaple/systick.c b/libmaple/systick.c new file mode 100644 index 0000000..47be69e --- /dev/null +++ b/libmaple/systick.c @@ -0,0 +1,52 @@ +/* ***************************************************************************** + * 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 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + * + * Created: 12/18/09 02:37:24 + * Copyright (c) 2009 Perry L. Hung. All rights reserved. + * + * ****************************************************************************/ + +/** + * @file systick.c + * + * @brief System timer interrupt handler and initialization routines + */ + +#include "libmaple.h" +#include "systick.h" + +#define MILLIS_INC 1 + +volatile uint32_t systick_timer_millis = 0; + +void systick_init(void) { + /* Set the reload counter to tick every 1ms */ + REG_SET_MASK(SYSTICK_RELOAD, MAPLE_RELOAD_VAL); +// SYSTICK_RELOAD = MAPLE_RELOAD_VAL; + + /* Clock the system timer with the core clock + * and turn it on, interrrupt every 1ms to keep track of millis()*/ + REG_SET(SYSTICK_CSR, SYSTICK_SRC_HCLK | + SYSTICK_ENABLE | + SYSTICK_TICKINT); +// SYSTICK_CSR = SYSTICK_SRC_HCLK | +// SYSTICK_ENABLE | +// SYSTICK_TICKINT; +} + +void SysTickHandler(void) { + systick_timer_millis++; +} + + -- cgit v1.2.3