[En-Nut-Discussion] Testcase For Crashing Nut/OS

[Harald Kipp]

Running the following code on Ethernut 2 (linked with Nut/OS 4.1.x)
will show the event handling problem.

#include <cfg/os.h>

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

#include <cfg/arch.h>

#include <dev/debug.h>
#include <dev/irqreg.h>
#include <dev/board.h>

#include <sys/thread.h>
#include <sys/timer.h>
#include <sys/event.h>
#include <sys/version.h>

/* Event queue. */
HANDLE tque;

/* Timer 1 interrupt. */
static void NutTraceTimer1IRQ(void *arg)
{
     putchar('.');
     NutEventPostFromIrq(&tque);
}

/* High priority background thread. */
THREAD(High, arg)
{
     NutThreadSetPriority(32);
     /* Loop for events. */
     for(;;) {
         if (NutEventWait(&tque, 0)) {
             putchar('T');
         }
         else {
             putchar('E');
         }
         NutSleep(50);
     }
}

/* Low priority background thread. */
THREAD(Low, arg)
{
     NutThreadSetPriority(96);
     /* Loop for events. */
     for(;;) {
         putchar('w');
         if (NutEventWait(&tque, 2)) {
             putchar('t');
         }
         else {
             putchar('e');
         }
     }
}

/* Main application routine. */
int main(void)
{
     /* Initialize the debug port. */
     u_long baud = 115200;
     NutRegisterDevice(&DEV_DEBUG, 0, 0);
     freopen(DEV_DEBUG_NAME, "w", stdout);
     _ioctl(_fileno(stdout), UART_SETSPEED, &baud);
     printf("\nNut/OS %s Event Test\n", NutVersionString());
     NutSleep(1000);

     /* Initialize timer/counter 1 interrupts. */
     outp(1, TCCR1B);
     NutRegisterIrqHandler(&sig_OVERFLOW1, NutTraceTimer1IRQ, 0);
     sbi(TIMSK, TOIE1);

     /* Create two additional threads. */
     NutThreadCreate("high", High, 0, 1024);
     NutThreadCreate("low", Low, 0, 1024);

     /* Loop for events. */
     for(;;) {
         if (NutEventWait(&tque, 1)) {
             putchar('1');
         }
         else {
             putchar('2');
         }
         NutSleep(5);
     }
}

The output is

Nut/OS 4.1.5.4 pre Event Test
w1twtwtwtw.E1twtwtw.ewtw1twtwtw.ewtw1twtw.ewtw1twtw.ewtwtw1tw.ewtwtw.2twtwtw1tw.ewtwtw.2twtwtw1.twewtwtwtw.2twtwtw.Etw1t
wtwtwtw.ew1twtwtw.ewtw1twtwtw.ewtw1twtw.ewtw1twtw.ewtwtw1tw.ewtwtw.2twtwtw1tw.ewtwtw.2twtwtw1.twewtwtwtw.Etw1twtwtw.ew1t
wtwtw.ewtw1twtw.ewtw1twtw.ewtw1tw.ewtwtw................................................................................
........................................................................................................................
........................................................................................................................
.................................

After a few events posted from interrupt all three threads stop working and
only the timer interrupt remains active.

Harald