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[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_wdt.c] - Rev 11
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// ################################################################################################# // # << NEORV32: neorv32_wdt.c - Watchdog Timer (WDT) HW Driver >> # // # ********************************************************************************************* # // # BSD 3-Clause License # // # # // # Copyright (c) 2020, 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_USE = 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_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_IO_WDT)) { return 1; } else { return 0; } } /**********************************************************************//** * Enable and configure watchdog timer. The WDT control register bits are listed in #NEORV32_WDT_CT_enum. * * @param[in] clk_prsc Clock prescaler to selet timeout interval. See #NEORV32_CLOCK_PRSC_enum. * @param[in] timeout_mode Trigger system reset on timeout when 1, trigger interrupt on timeout when 0. **************************************************************************/ void neorv32_wdt_setup(uint8_t clk_prsc, uint8_t timeout_mode) { uint32_t prsc = (uint32_t)(clk_prsc & 0x07); prsc = prsc << WDT_CT_CLK_SEL0; uint32_t mode = (uint32_t)(timeout_mode & 0x01); mode = mode << WDT_CT_MODE; uint32_t password = (uint32_t)(WDT_PASSWORD); password = password << WDT_CT_PASSWORD_LSB; uint32_t enable = (uint32_t)(1 << WDT_CT_EN); WDT_CT = password | enable | mode | prsc; } /**********************************************************************//** * Disable watchdog timer. **************************************************************************/ void neorv32_wdt_disable(void) { WDT_CT = ((uint32_t)(WDT_PASSWORD << WDT_CT_PASSWORD_LSB)) | ((uint32_t)(0 << WDT_CT_EN)); } /**********************************************************************//** * Reset (running) watchdog. **************************************************************************/ void neorv32_wdt_reset(void) { WDT_CT = WDT_CT | ((uint32_t)(WDT_PASSWORD << WDT_CT_PASSWORD_LSB)); } /**********************************************************************//** * Get cause of last watchdog action. * * @return Cause of last reset/IRQ (0: undefined, 1: external reset, 2: watchdog timeout, 3: watchdog access error (wrong password)). **************************************************************************/ uint8_t neorv32_wdt_get_cause(void) { uint8_t cause = 0; uint32_t ctrl = WDT_CT; if (ctrl & (1 << WDT_CT_CAUSE)) { // reset/IRQ casued by watchdog if (ctrl & (1 << WDT_CT_PWFAIL)) { // reset/IRQ due to wrong password cause = 3; } else { // reset/IRQ due to timeout cause = 2; } } else { // external reset cause = 1; } return cause; } /**********************************************************************//** * Force watchdog action (reset/IRQ) via wrong-password access. **************************************************************************/ void neorv32_wdt_force(void) { WDT_CT = 0; // invalid access }
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