Harald: 1 revision imported

2016-10-27T16:03:01Z

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Daniel: /* Test Environments */

2009-03-10T17:41:03Z

‎Test Environments

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== Test Environments ==

{| class="smalldiv"
| style="background-color:#F6F9ED" |
| style="background-color:#F6F9ED" | Hardware Comments
| style="background-color:#F6F9ED" | '''Nut/OS 4.8.0'''
|-
| Ethernut 1.3 H
|
| Unknown bug: doesn't recognize reset cause
|-
| Ethernut 2.1 B
|
| Unknown bug: doesn't recognize reset cause
|-
| Ethernut 3.0 E
|
| Compiling Error (see discussion)
|-
| EIR 1.0 C
| Set jumper JP1 to DBGU mode.
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/system-reset-EIR1C-nutos-4.8.0.zip '''Binaries''']
|-
| id="compilertd" colspan="5" |'''Compiler:''' ARM-GCC 4.2.2 ; AVR-GCC 4.3.0
|}

== Source Code ==

<source lang="c">
#include <dev/board.h>
#include <dev/reset.h>
#include <sys/timer.h>

#include <stdio.h>
#include <io.h>

int main(void)
{
int rc = NutResetCause();
uint32_t baud = 115200;
char *cause;
int i;

NutRegisterDevice(&DEV_DEBUG, 0, 0);
freopen(DEV_DEBUG_NAME, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);

switch (rc) {
case NUT_RSTTYP_POWERUP:
cause = "Powerup";
break;
case NUT_RSTTYP_WATCHDOG:
cause = "Watchdog";
break;
case NUT_RSTTYP_EXTERNAL:
cause = "External";
break;
case NUT_RSTTYP_SOFTWARE:
cause = "Software";
break;
case NUT_RSTTYP_BROWNOUT:
cause = "Brownout";
break;
default:
cause = "Unknown";
break;
}
printf("\nLast reset caused by %s (rc = %d)\n", cause, rc);

for(i = 32; --i > 0 ;) {
printf("\rNext reset in %d seconds", i);
NutSleep(1000);
}
printf("\nReset\n");
NutReset();
printf("Reset failed\n");
for (;;);

return 0;
}
</source>

== Details ==

You can invoke a system reset by calling

<source lang="c">
NutReset();
</source>

This function will only return in case of a failure.

Use <code>NutResetCause</code> to determine the cause of the last reset.

<source lang="c">
rc = NutResetCause();
</source>

This function should be called at the very first beginning of your main program. It may return any of the following values:

* <code>NUT_RSTTYP_POWERUP</code>, if the reset was caused by powering up the system.
* <code>NUT_RSTTYP_WATCHDOG</code>, if the watchdog triggered the last reset.
* <code>NUT_RSTTYP_EXTERNAL</code>, if an external reset signal appeared like pressing a reset button.
* <code>NUT_RSTTYP_SOFTWARE</code>, if the reset was triggered by writing to a reset controller register.
* <code>NUT_RSTTYP_BROWNOUT</code>, if the reset was cause by low voltage detection.

Which code is actually returned depends on the capabilities of the CPU and the board design.

== See also ==
* [[Watchdog Demo]]
* More [[Nut/OS Examples]]

[[Category:Code Snippets]]

{{Languages}}

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