114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @defgroup CM3_systick_defines SysTick Defines
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@brief <b>libopencm3 Defined Constants and Types for the Cortex SysTick </b>
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@ingroup CM3_defines
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@version 1.0.0
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@author @htmlonly © @endhtmlonly 2010 Thomas Otto <tommi@viadmin.org>
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@date 19 August 2012
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LGPL License Terms @ref lgpl_license
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*/
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/**@{*/
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#ifndef LIBOPENCM3_SYSTICK_H
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#define LIBOPENCM3_SYSTICK_H
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#include <libopencm3/cm3/memorymap.h>
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#include <libopencm3/cm3/common.h>
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/* --- SYSTICK registers --------------------------------------------------- */
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/* Control and status register (STK_CTRL) */
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#define STK_CTRL MMIO32(SYS_TICK_BASE + 0x00)
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/* reload value register (STK_LOAD) */
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#define STK_LOAD MMIO32(SYS_TICK_BASE + 0x04)
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/* current value register (STK_VAL) */
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#define STK_VAL MMIO32(SYS_TICK_BASE + 0x08)
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/* calibration value register (STK_CALIB) */
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#define STK_CALIB MMIO32(SYS_TICK_BASE + 0x0C)
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/* --- STK_CTRL values ----------------------------------------------------- */
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/* Bits [31:17] Reserved, must be kept cleared. */
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/* COUNTFLAG: */
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#define STK_CTRL_COUNTFLAG (1 << 16)
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/* Bits [15:3] Reserved, must be kept cleared. */
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/* CLKSOURCE: Clock source selection */
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#define STK_CTRL_CLKSOURCE (1 << 2)
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#define STK_CTRL_CLKSOURCE_LSB 2
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/** @defgroup systick_clksource Clock source selection
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@ingroup CM3_systick_defines
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@{*/
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#define STK_CTRL_CLKSOURCE_AHB_DIV8 0
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#define STK_CTRL_CLKSOURCE_AHB 1
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/**@}*/
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/* TICKINT: SysTick exception request enable */
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#define STK_CTRL_TICKINT (1 << 1)
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/* ENABLE: Counter enable */
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#define STK_CTRL_ENABLE (1 << 0)
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/* --- STK_LOAD values ----------------------------------------------------- */
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/* Bits [31:24] Reserved, must be kept cleared. */
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/* RELOAD[23:0]: RELOAD value */
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/* --- STK_VAL values ------------------------------------------------------ */
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/* Bits [31:24] Reserved, must be kept cleared. */
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/* CURRENT[23:0]: Current counter value */
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/* --- STK_CALIB values ---------------------------------------------------- */
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/* NOREF: NOREF flag */
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#define STK_CALIB_NOREF (1 << 31)
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/* SKEW: SKEW flag */
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#define STK_CALIB_SKEW (1 << 30)
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/* Bits [29:24] Reserved, must be kept cleared. */
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/* TENMS[23:0]: Calibration value */
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/* --- Function Prototypes ------------------------------------------------- */
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BEGIN_DECLS
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void systick_set_reload(u32 value);
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u32 systick_get_value(void);
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void systick_set_clocksource(u8 clocksource);
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void systick_interrupt_enable(void);
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void systick_interrupt_disable(void);
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void systick_counter_enable(void);
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void systick_counter_disable(void);
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u8 systick_get_countflag(void);
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u32 systick_get_calib(void);
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END_DECLS
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#endif
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/**@}*/
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