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// #################################################################################################
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// # < Test program for the Watchdog Timer (WDT) > #
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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 NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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// Libraries
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#include <stdint.h>
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#include <neo430.h>
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// Configuration
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#define BAUD_RATE 19200
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/* ------------------------------------------------------------
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* INFO Main function
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* ------------------------------------------------------------ */
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int main(void) {
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// setup UART
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neo430_uart_setup(BAUD_RATE);
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// intro text
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neo430_uart_br_print("\n<<< Watchdog Test Program >>>\n\n");
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// check if WDT was synthesized, exit if no WDT is available
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if (!(SYS_FEATURES & (1<<SYS_WDT_EN))) {
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neo430_uart_br_print("Error! No WDT synthesized!");
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return 0;
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}
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neo430_uart_br_print("Cause of last processor reset: ");
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uint16_t wdt_cause = WDT_CT;
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if ((wdt_cause & (1<<WDT_CT_RCAUSE)) == 0) { // reset caused by WDT at all?
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neo430_uart_br_print("EXTERNAL RESET");
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}
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else {
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if ((wdt_cause & (1<<WDT_CT_RPWFAIL)) == 0) { // WDT reset caused by wrong password access?
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neo430_uart_br_print("WATCHDOG Timeout");
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}
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else {
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neo430_uart_br_print("WATCHDOG Access Error");
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}
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}
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neo430_uart_br_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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"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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"WDT resets: [................................................................]");
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neo430_uart_bs(65); // back-space terminal cursor by 65 positions
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// activate watchdog: second largest period
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neo430_wdt_enable(WDT_PRSC_2048);
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uint8_t i;
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for (i=0; i<64; i++) {
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neo430_uart_putc('#');
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neo430_wdt_reset(); // reset watchdog
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neo430_cpu_delay_ms(80); // wait some time
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// trigger manual reset if key pressed
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if (neo430_uart_char_received()) {
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neo430_wdt_force_hw_reset(); // access wdt with wrong password
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}
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}
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while (1) { // wait for the watchdog time-out or key press
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if (neo430_uart_char_received()) {
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neo430_wdt_force_hw_reset();
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}
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}
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return 0;
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}
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