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[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_wdt.c] - Rev 69
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// ################################################################################################# // # << NEORV32: neorv32_wdt.c - Watchdog Timer (WDT) HW Driver >> # // # ********************************************************************************************* # // # BSD 3-Clause License # // # # // # Copyright (c) 2021, Stephan Nolting. All rights reserved. # // # # // # Redistribution and use in source and binary forms, with or without modification, are # // # permitted provided that the following conditions are met: # // # # // # 1. Redistributions of source code must retain the above copyright notice, this list of # // # conditions and the following disclaimer. # // # # // # 2. Redistributions in binary form must reproduce the above copyright notice, this list of # // # conditions and the following disclaimer in the documentation and/or other materials # // # provided with the distribution. # // # # // # 3. Neither the name of the copyright holder nor the names of its contributors may be used to # // # endorse or promote products derived from this software without specific prior written # // # permission. # // # # // # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # // # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF # // # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE # // # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # // # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE # // # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED # // # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING # // # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED # // # OF THE POSSIBILITY OF SUCH DAMAGE. # // # ********************************************************************************************* # // # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting # // ################################################################################################# /**********************************************************************//** * @file neorv32_wdt.c * @author Stephan Nolting * @brief Watchdog Timer (WDT) HW driver source file. * * @note These functions should only be used if the WDT unit was synthesized (IO_WDT_EN = true). **************************************************************************/ #include "neorv32.h" #include "neorv32_wdt.h" /**********************************************************************//** * Check if WDT unit was synthesized. * * @return 0 if WDT was not synthesized, 1 if WDT is available. **************************************************************************/ int neorv32_wdt_available(void) { if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_IO_WDT)) { return 1; } else { return 0; } } /**********************************************************************//** * Configure and enable watchdog timer. The WDT control register bits are listed in #NEORV32_WDT_CTRL_enum. * * @param[in] prsc Clock prescaler to select timeout interval. See #NEORV32_CLOCK_PRSC_enum. * @param[in] mode Trigger system reset on timeout when 1, trigger interrupt on timeout when 0. * @param[in] lock Control register will be locked when 1 (until next reset). **************************************************************************/ void neorv32_wdt_setup(uint8_t prsc, uint8_t mode, uint8_t lock) { NEORV32_WDT.CTRL = (1 << WDT_CTRL_RESET); // reset WDT counter uint32_t prsc_int = (uint32_t)(prsc & 0x07); prsc_int = prsc_int << WDT_CTRL_CLK_SEL0; uint32_t mode_int = (uint32_t)(mode & 0x01); mode_int = mode_int << WDT_CTRL_MODE; uint32_t lock_int = (uint32_t)(lock & 0x01); lock_int = lock_int << WDT_CTRL_LOCK; const uint32_t enable = (uint32_t)(1 << WDT_CTRL_EN); // update WDT control register NEORV32_WDT.CTRL = enable | mode_int | prsc_int | lock_int; } /**********************************************************************//** * Disable watchdog timer. * * @return Returns 0 if WDT is really deactivated, -1 otherwise. **************************************************************************/ int neorv32_wdt_disable(void) { NEORV32_WDT.CTRL = 0; // check if wdt is really off if (NEORV32_WDT.CTRL & (1 << WDT_CTRL_EN)) { return -1; // WDT still active } else { return 0; } } /**********************************************************************//** * Reset (running) watchdog. **************************************************************************/ void neorv32_wdt_reset(void) { NEORV32_WDT.CTRL = NEORV32_WDT.CTRL | (1 << WDT_CTRL_RESET); } /**********************************************************************//** * Get cause of last system reset. * * @return Cause of last reset/IRQ (0: external reset, 1: watchdog timeout). **************************************************************************/ int neorv32_wdt_get_cause(void) { if (NEORV32_WDT.CTRL & (1 << WDT_CTRL_RCAUSE)) { // reset caused by watchdog return 1; } else { // external reset return 0; } } /**********************************************************************//** * Force immediate watchdog action (reset/IRQ). **************************************************************************/ void neorv32_wdt_force(void) { NEORV32_WDT.CTRL = NEORV32_WDT.CTRL | (1 << WDT_CTRL_FORCE); }
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