| Line 64... |
Line 64... |
if (neorv32_wdt_available() == 0) {
|
if (neorv32_wdt_available() == 0) {
|
return 1; // nope, no WDT unit synthesized
|
return 1; // nope, no WDT unit synthesized
|
}
|
}
|
|
|
// check if UART unit is implemented at all
|
// check if UART unit is implemented at all
|
if (neorv32_uart_available() == 0) {
|
if (neorv32_uart0_available() == 0) {
|
return 1; // nope, no UART unit synthesized
|
return 1; // nope, no UART unit synthesized
|
}
|
}
|
|
|
|
|
// capture all exceptions and give debug info via UART
|
// capture all exceptions and give debug info via UART
|
// this is not required, but keeps us safe
|
// this is not required, but keeps us safe
|
neorv32_rte_setup();
|
neorv32_rte_setup();
|
|
|
// init UART at default baud rate, no parity bits, ho hw flow control
|
// init UART at default baud rate, no parity bits, ho hw flow control
|
neorv32_uart_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
|
neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
|
|
|
// check available hardware extensions and compare with compiler flags
|
// check available hardware extensions and compare with compiler flags
|
neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
|
neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
|
|
|
// simple text output via UART (strings only)
|
// simple text output via UART (strings only)
|
neorv32_uart_print("\nWatchdog system reset demo program\n\n");
|
neorv32_uart0_print("\nWatchdog system reset demo program\n\n");
|
|
|
|
|
// show the cause of the last processor reset
|
// show the cause of the last processor reset
|
neorv32_uart_print("Cause of last processor reset: ");
|
neorv32_uart0_print("Cause of last processor reset: ");
|
uint8_t wdt_cause = neorv32_wdt_get_cause();
|
uint8_t wdt_cause = neorv32_wdt_get_cause();
|
|
|
if (wdt_cause == 0) {
|
if (wdt_cause == 0) {
|
neorv32_uart_print("External reset\n");
|
neorv32_uart0_print("External reset\n");
|
}
|
}
|
else if (wdt_cause == 1) {
|
else if (wdt_cause == 1) {
|
neorv32_uart_print("Watchdog\n");
|
neorv32_uart0_print("Watchdog\n");
|
}
|
}
|
else {
|
else {
|
neorv32_uart_print("Undefined\n");
|
neorv32_uart0_print("Undefined\n");
|
}
|
}
|
|
|
|
|
// the watchod has a 20-bit counter, which triggers either an interrupt or a system reset
|
// the watchod has a 20-bit counter, which triggers either an interrupt or a system reset
|
// when overflowing
|
// when overflowing
|
| Line 107... |
Line 107... |
// access so nobody can alter the configuration until next reset)
|
// access so nobody can alter the configuration until next reset)
|
neorv32_wdt_setup(CLK_PRSC_64, 1, 1);
|
neorv32_wdt_setup(CLK_PRSC_64, 1, 1);
|
|
|
|
|
|
|
neorv32_uart_print("\n\nWill reset WDT 64 times.\n"
|
neorv32_uart0_print("\n\nWill reset WDT 64 times.\n"
|
"A system reset will be executed in the following time out.\n"
|
"A system reset will be executed in the following time out.\n"
|
"Press any key to trigger manual WDT hardware reset by WDT access with wrong password.\n"
|
"Press any key to trigger manual WDT hardware reset by WDT access with wrong password.\n"
|
"Restart this program after reset to check for the reset cause.\n\n"
|
"Restart this program after reset to check for the reset cause.\n\n"
|
"WDT resets: ");
|
"WDT resets: ");
|
|
|
uint8_t i;
|
uint8_t i;
|
for (i=0; i<64; i++) {
|
for (i=0; i<64; i++) {
|
neorv32_uart_putc('.');
|
neorv32_uart0_putc('.');
|
neorv32_wdt_reset(); // reset watchdog
|
neorv32_wdt_reset(); // reset watchdog
|
neorv32_cpu_delay_ms(80); // wait some time
|
neorv32_cpu_delay_ms(80); // wait some time
|
|
|
// trigger manual reset if key pressed
|
// trigger manual reset if key pressed
|
if (neorv32_uart_char_received()) { // just check, if a char has been received
|
if (neorv32_uart0_char_received()) { // just check, if a char has been received
|
neorv32_wdt_force(); // access wdt with wrong password
|
neorv32_wdt_force(); // access wdt with wrong password
|
}
|
}
|
}
|
}
|
|
|
while (1) { // wait for the watchdog time-out or trigger manual reset if key pressed
|
while (1) { // wait for the watchdog time-out or trigger manual reset if key pressed
|
if (neorv32_uart_char_received()) { // just check, if a char has been received
|
if (neorv32_uart0_char_received()) { // just check, if a char has been received
|
neorv32_wdt_force(); // access wdt with wrong password
|
neorv32_wdt_force(); // access wdt with wrong password
|
}
|
}
|
}
|
}
|
|
|
return 0;
|
return 0;
|
