// #################################################################################################
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// #################################################################################################
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// # << NEORV32 - Watchdog Demo Program >> #
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// # << NEORV32 - Watchdog Demo Program >> #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # BSD 3-Clause License #
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// # #
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// # #
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// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #
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// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #
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// # #
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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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// # 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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// # permitted provided that the following conditions are met: #
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// # #
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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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// # 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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// # conditions and the following disclaimer. #
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// # #
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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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// # 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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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # provided with the distribution. #
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// # #
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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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// # 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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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # permission. #
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// # #
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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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// # 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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// # 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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// # 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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// # 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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// # 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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// # 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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// # 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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// # 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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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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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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/**********************************************************************//**
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/**********************************************************************//**
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* @file demo_wdt/main.c
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* @file demo_wdt/main.c
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* @author Stephan Nolting
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* @author Stephan Nolting
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* @brief Watchdog system reset demo program.
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* @brief Watchdog system reset demo program.
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**************************************************************************/
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**************************************************************************/
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#include <neorv32.h>
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#include <neorv32.h>
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/**********************************************************************//**
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/**********************************************************************//**
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* @name User configuration
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* @name User configuration
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**************************************************************************/
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**************************************************************************/
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/**@{*/
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/**@{*/
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/** UART BAUD rate */
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/** UART BAUD rate */
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#define BAUD_RATE 19200
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#define BAUD_RATE 19200
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/**@}*/
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/**@}*/
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/**********************************************************************//**
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/**********************************************************************//**
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* Main function
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* Main function
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*
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*
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* @note This program requires the WDT and the UART to be synthesized.
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* @note This program requires the WDT and the UART to be synthesized.
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*
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*
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* @return Irrelevant.
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* @return Irrelevant.
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**************************************************************************/
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**************************************************************************/
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int main() {
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int main() {
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// check if WDT unit is implemented at all
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// check if WDT unit is implemented at all
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if (neorv32_wdt_available() == 0) {
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if (neorv32_wdt_available() == 0) {
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return 0; // nope, no WDT unit synthesized
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return 0; // nope, no WDT unit synthesized
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}
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}
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// check if UART unit is implemented at all
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// check if UART unit is implemented at all
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if (neorv32_uart_available() == 0) {
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if (neorv32_uart_available() == 0) {
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return 0; // nope, no UART unit synthesized
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return 0; // nope, no UART unit synthesized
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}
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}
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// capture all exceptions and give debug info via UART
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// capture all exceptions and give debug info via UART
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// this is not required, but keeps us safe
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// this is not required, but keeps us safe
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neorv32_rte_setup();
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neorv32_rte_setup();
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// init UART at default baud rate, no parity bits, no rx interrupt, no tx interrupt
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// init UART at default baud rate, no parity bits
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neorv32_uart_setup(BAUD_RATE, 0b00, 0, 0);
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neorv32_uart_setup(BAUD_RATE, 0b00);
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// check available hardware extensions and compare with compiler flags
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// check available hardware extensions and compare with compiler flags
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neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
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neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
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// simple text output via UART (strings only)
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// simple text output via UART (strings only)
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neorv32_uart_print("\nWatchdog system reset demo program\n\n");
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neorv32_uart_print("\nWatchdog system reset demo program\n\n");
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// show the cause of the last processor reset
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// show the cause of the last processor reset
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neorv32_uart_print("Cause of last processor reset: ");
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neorv32_uart_print("Cause of last processor reset: ");
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uint8_t wdt_cause = neorv32_wdt_get_cause();
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uint8_t wdt_cause = neorv32_wdt_get_cause();
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if (wdt_cause == 0) {
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if (wdt_cause == 0) {
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neorv32_uart_print("External reset\n");
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neorv32_uart_print("External reset\n");
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}
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}
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else if (wdt_cause == 1) {
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else if (wdt_cause == 1) {
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neorv32_uart_print("Watchdog\n");
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neorv32_uart_print("Watchdog\n");
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}
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}
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else {
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else {
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neorv32_uart_print("Undefined\n");
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neorv32_uart_print("Undefined\n");
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}
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}
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// the watchod has a 20-bit counter, which triggers either an interrupt or a system reset
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// the watchod has a 20-bit counter, which triggers either an interrupt or a system reset
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// when overflowing
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// when overflowing
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// init watchdog (watchdog timer increment = cpu_clock/64, trigger reset on overflow, lock
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// init watchdog (watchdog timer increment = cpu_clock/64, trigger reset on overflow, lock
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// access so nobody can alter the configuration until next reset)
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// access so nobody can alter the configuration until next reset)
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neorv32_wdt_setup(CLK_PRSC_64, 1, 1);
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neorv32_wdt_setup(CLK_PRSC_64, 1, 1);
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neorv32_uart_print("\n\nWill reset WDT 64 times.\n"
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neorv32_uart_print("\n\nWill reset WDT 64 times.\n"
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"A system reset will be executed in the following time out.\n"
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"A system reset will be executed in the following time out.\n"
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"Press any key to trigger manual WDT hardware reset by WDT access with wrong password.\n"
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"Press any key to trigger manual WDT hardware reset by WDT access with wrong password.\n"
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"Restart this program after reset to check for the reset cause.\n\n"
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"Restart this program after reset to check for the reset cause.\n\n"
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"WDT resets: ");
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"WDT resets: ");
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uint8_t i;
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uint8_t i;
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for (i=0; i<64; i++) {
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for (i=0; i<64; i++) {
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neorv32_uart_putc('.');
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neorv32_uart_putc('.');
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neorv32_wdt_reset(); // reset watchdog
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neorv32_wdt_reset(); // reset watchdog
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neorv32_cpu_delay_ms(80); // wait some time
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neorv32_cpu_delay_ms(80); // wait some time
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// trigger manual reset if key pressed
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// trigger manual reset if key pressed
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if (neorv32_uart_char_received()) { // just check, if a char has been received
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if (neorv32_uart_char_received()) { // just check, if a char has been received
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neorv32_wdt_force(); // access wdt with wrong password
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neorv32_wdt_force(); // access wdt with wrong password
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}
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}
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}
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}
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while (1) { // wait for the watchdog time-out or trigger manual reset if key pressed
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while (1) { // wait for the watchdog time-out or trigger manual reset if key pressed
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if (neorv32_uart_char_received()) { // just check, if a char has been received
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if (neorv32_uart_char_received()) { // just check, if a char has been received
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neorv32_wdt_force(); // access wdt with wrong password
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neorv32_wdt_force(); // access wdt with wrong password
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}
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}
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}
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}
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return 0;
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return 0;
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}
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}
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