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// #################################################################################################
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// # << NEORV32: neorv32_wdt.c - Watchdog Timer (WDT) HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file neorv32_wdt.c
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* @author Stephan Nolting
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* @brief Watchdog Timer (WDT) HW driver source file.
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*
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* @note These functions should only be used if the WDT unit was synthesized (IO_WDT_USE = true).
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_wdt.h"
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/**********************************************************************//**
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* Check if WDT unit was synthesized.
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*
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* @return 0 if WDT was not synthesized, 1 if WDT is available.
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**************************************************************************/
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int neorv32_wdt_available(void) {
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if (SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_IO_WDT)) {
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return 1;
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}
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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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* Enable and configure watchdog timer. The WDT control register bits are listed in #NEORV32_WDT_CT_enum.
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*
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* @param[in] clk_prsc Clock prescaler to selet timeout interval. See #NEORV32_CLOCK_PRSC_enum.
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* @param[in] timeout_mode Trigger system reset on timeout when 1, trigger interrupt on timeout when 0.
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**************************************************************************/
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void neorv32_wdt_setup(uint8_t clk_prsc, uint8_t timeout_mode) {
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uint32_t prsc = (uint32_t)(clk_prsc & 0x07);
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prsc = prsc << WDT_CT_CLK_SEL0;
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uint32_t mode = (uint32_t)(timeout_mode & 0x01);
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mode = mode << WDT_CT_MODE;
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uint32_t password = (uint32_t)(WDT_PASSWORD);
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password = password << WDT_CT_PASSWORD_LSB;
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uint32_t enable = (uint32_t)(1 << WDT_CT_EN);
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WDT_CT = password | enable | mode | prsc;
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}
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/**********************************************************************//**
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* Disable watchdog timer.
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**************************************************************************/
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void neorv32_wdt_disable(void) {
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WDT_CT = ((uint32_t)(WDT_PASSWORD << WDT_CT_PASSWORD_LSB)) | ((uint32_t)(0 << WDT_CT_EN));
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}
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/**********************************************************************//**
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* Reset (running) watchdog.
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**************************************************************************/
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void neorv32_wdt_reset(void) {
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WDT_CT = WDT_CT | ((uint32_t)(WDT_PASSWORD << WDT_CT_PASSWORD_LSB));
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}
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/**********************************************************************//**
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* Get cause of last watchdog action.
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*
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* @return Cause of last reset/IRQ (0: undefined, 1: external reset, 2: watchdog timeout, 3: watchdog access error (wrong password)).
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**************************************************************************/
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uint8_t neorv32_wdt_get_cause(void) {
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uint8_t cause = 0;
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uint32_t ctrl = WDT_CT;
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if (ctrl & (1 << WDT_CT_CAUSE)) { // reset/IRQ casued by watchdog
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if (ctrl & (1 << WDT_CT_PWFAIL)) { // reset/IRQ due to wrong password
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cause = 3;
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}
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else { // reset/IRQ due to timeout
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cause = 2;
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}
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}
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else { // external reset
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cause = 1;
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}
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return cause;
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}
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/**********************************************************************//**
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* Force watchdog action (reset/IRQ) via wrong-password access.
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**************************************************************************/
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void neorv32_wdt_force(void) {
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WDT_CT = 0; // invalid access
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}
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