From bc5146b710c8be3dfa4a8601bd3ca29408ae6397 Mon Sep 17 00:00:00 2001 From: chrysn Date: Thu, 18 Oct 2012 22:26:46 +0200 Subject: unified systick handling the only change this results in in the example binaries is in the hackrf-jellybean/systick example, where the the check in systick_set_clocksource for overflowing from the stm32 area gets used. --- include/libopencm3/cm3/systick.h | 113 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 include/libopencm3/cm3/systick.h (limited to 'include/libopencm3/cm3/systick.h') diff --git a/include/libopencm3/cm3/systick.h b/include/libopencm3/cm3/systick.h new file mode 100644 index 0000000..5e7715b --- /dev/null +++ b/include/libopencm3/cm3/systick.h @@ -0,0 +1,113 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2010 Thomas Otto + * Copyright (C) 2012 Benjamin Vernoux + * + * This library 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 3 of the License, or + * (at your option) any later version. + * + * This library 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 library. If not, see . + */ +/** @defgroup CM3_systick_defines SysTick Defines + +@brief libopencm3 Defined Constants and Types for the Cortex SysTick + +@ingroup CM3_defines + +@version 1.0.0 + +@author @htmlonly © @endhtmlonly 2010 Thomas Otto + +@date 19 August 2012 + +LGPL License Terms @ref lgpl_license + */ + +/**@{*/ + +#ifndef LIBOPENCM3_SYSTICK_H +#define LIBOPENCM3_SYSTICK_H + +#include +#include + +/* --- SYSTICK registers --------------------------------------------------- */ + +/* Control and status register (STK_CTRL) */ +#define STK_CTRL MMIO32(SYS_TICK_BASE + 0x00) + +/* reload value register (STK_LOAD) */ +#define STK_LOAD MMIO32(SYS_TICK_BASE + 0x04) + +/* current value register (STK_VAL) */ +#define STK_VAL MMIO32(SYS_TICK_BASE + 0x08) + +/* calibration value register (STK_CALIB) */ +#define STK_CALIB MMIO32(SYS_TICK_BASE + 0x0C) + +/* --- STK_CTRL values ----------------------------------------------------- */ +/* Bits [31:17] Reserved, must be kept cleared. */ +/* COUNTFLAG: */ +#define STK_CTRL_COUNTFLAG (1 << 16) +/* Bits [15:3] Reserved, must be kept cleared. */ +/* CLKSOURCE: Clock source selection */ +#define STK_CTRL_CLKSOURCE (1 << 2) +#define STK_CTRL_CLKSOURCE_LSB 2 +/** @defgroup systick_clksource Clock source selection +@ingroup CM3_systick_defines + +@{*/ +#define STK_CTRL_CLKSOURCE_AHB_DIV8 0 +#define STK_CTRL_CLKSOURCE_AHB 1 +/**@}*/ + +/* TICKINT: SysTick exception request enable */ +#define STK_CTRL_TICKINT (1 << 1) +/* ENABLE: Counter enable */ +#define STK_CTRL_ENABLE (1 << 0) + +/* --- STK_LOAD values ----------------------------------------------------- */ +/* Bits [31:24] Reserved, must be kept cleared. */ +/* RELOAD[23:0]: RELOAD value */ + +/* --- STK_VAL values ------------------------------------------------------ */ +/* Bits [31:24] Reserved, must be kept cleared. */ +/* CURRENT[23:0]: Current counter value */ + +/* --- STK_CALIB values ---------------------------------------------------- */ +/* NOREF: NOREF flag */ +#define STK_CALIB_NOREF (1 << 31) +/* SKEW: SKEW flag */ +#define STK_CALIB_SKEW (1 << 30) +/* Bits [29:24] Reserved, must be kept cleared. */ +/* TENMS[23:0]: Calibration value */ + +/* --- Function Prototypes ------------------------------------------------- */ + +BEGIN_DECLS + +void systick_set_reload(u32 value); +u32 systick_get_value(void); +void systick_set_clocksource(u8 clocksource); +void systick_interrupt_enable(void); +void systick_interrupt_disable(void); +void systick_counter_enable(void); +void systick_counter_disable(void); +u8 systick_get_countflag(void); + +u32 systick_get_calib(void); + +END_DECLS + +#endif +/**@}*/ + -- cgit v1.2.3