7df63fcae0
Added --terse and --mailback options to the make stylecheck target. It also does continue even if it enounters a possible error. We decided on two exceptions from the linux kernel coding standard: - Empty wait while loops may end with ; on the same line. - All blocks after while, if, for have to be in brackets even if they only contain one statement. Otherwise it is easy to introduce an error. Checkpatch needs to be adapted to reflect those changes.
163 lines
3.9 KiB
C
163 lines
3.9 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_file SysTick
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@ingroup CM3_files
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@brief <b>libopencm3 Cortex System Tick Timer</b>
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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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This library supports the System Tick timer in ARM Cortex Microcontrollers.
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The System Tick timer is part of the ARM Cortex core. It is a 24 bit
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down counter that can be configured with an automatical reload value.
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LGPL License Terms @ref lgpl_license
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*/
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/**@{*/
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#include <libopencm3/cm3/systick.h>
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/*---------------------------------------------------------------------------*/
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/** @brief SysTick Set the Automatic Reload Value.
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The counter is set to the reload value when the counter starts and after it
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reaches zero.
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@param[in] value u32. 24 bit reload value.
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*/
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void systick_set_reload(u32 value)
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{
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STK_LOAD = (value & 0x00FFFFFF);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief SysTick Read the Automatic Reload Value.
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@returns 24 bit reload value as u32.
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*/
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u32 systick_get_reload(void)
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{
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return STK_LOAD & 0x00FFFFFF;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Get the current SysTick counter value.
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@returns 24 bit current value as u32.
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*/
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u32 systick_get_value(void)
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{
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return STK_VAL & 0x00FFFFFF;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Set the SysTick Clock Source.
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The clock source can be either the AHB clock or the same clock divided by 8.
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@param[in] clocksource u8. Clock source from @ref systick_clksource.
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*/
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void systick_set_clocksource(u8 clocksource)
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{
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if (clocksource < 2) {
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STK_CTRL |= (clocksource << STK_CTRL_CLKSOURCE_LSB);
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Enable SysTick Interrupt.
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*/
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void systick_interrupt_enable(void)
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{
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STK_CTRL |= STK_CTRL_TICKINT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Disable SysTick Interrupt.
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*/
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void systick_interrupt_disable(void)
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{
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STK_CTRL &= ~STK_CTRL_TICKINT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Enable SysTick Counter.
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*/
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void systick_counter_enable(void)
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{
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STK_CTRL |= STK_CTRL_ENABLE;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Disable SysTick Counter.
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*/
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void systick_counter_disable(void)
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{
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STK_CTRL &= ~STK_CTRL_ENABLE;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief SysTick Read the Counter Flag.
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The count flag is set when the timer count becomes zero, and is cleared when
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the flag is read.
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@returns Boolean if flag set.
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*/
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u8 systick_get_countflag(void)
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{
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if (STK_CTRL & STK_CTRL_COUNTFLAG) {
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return 1;
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} else {
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief SysTick Get Calibration Value
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@returns Current calibration value
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*/
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u32 systick_get_calib(void)
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{
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return STK_CALIB & 0x00FFFFFF;
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}
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/**@}*/
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