ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/testhal/LPC11xx/IRQ_STORM/main.c

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+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#include <stdlib.h>
+
+#include "ch.h"
+#include "hal.h"
+
+/*===========================================================================*/
+/* Configurable settings.                                                    */
+/*===========================================================================*/
+
+#ifndef RANDOMIZE
+#define RANDOMIZE       FALSE
+#endif
+
+#ifndef ITERATIONS
+#define ITERATIONS      100
+#endif
+
+#ifndef NUM_THREADS
+#define NUM_THREADS     4
+#endif
+
+#ifndef MAILBOX_SIZE
+#define MAILBOX_SIZE    4
+#endif
+
+/*===========================================================================*/
+/* Test related code.                                                        */
+/*===========================================================================*/
+
+#define MSG_SEND_LEFT   0
+#define MSG_SEND_RIGHT  1
+
+static bool_t saturated;
+
+/*
+ * Mailboxes and buffers.
+ */
+static Mailbox mb[NUM_THREADS];
+static msg_t b[NUM_THREADS][MAILBOX_SIZE];
+
+/*
+ * Test worker threads.
+ */
+static WORKING_AREA(waWorkerThread[NUM_THREADS], 128);
+static msg_t WorkerThread(void *arg) {
+  static volatile unsigned x = 0;
+  static unsigned cnt = 0;
+  unsigned me = (unsigned)arg;
+  unsigned target;
+  unsigned r;
+  msg_t msg;
+
+  chRegSetThreadName("worker");
+
+  /* Work loop.*/
+  while (TRUE) {
+    /* Waiting for a message.*/
+   chMBFetch(&mb[me], &msg, TIME_INFINITE);
+
+#if RANDOMIZE
+   /* Pseudo-random delay.*/
+   {
+     chSysLock();
+     r = rand() & 15;
+     chSysUnlock();
+     while (r--)
+       x++;
+   }
+#else
+   /* Fixed delay.*/
+   {
+     r = me >> 4;
+     while (r--)
+       x++;
+   }
+#endif
+
+    /* Deciding in which direction to re-send the message.*/
+    if (msg == MSG_SEND_LEFT)
+      target = me - 1;
+    else
+      target = me + 1;
+
+    if (target < NUM_THREADS) {
+      /* If this thread is not at the end of a chain re-sending the message,
+         note this check works because the variable target is unsigned.*/
+      msg = chMBPost(&mb[target], msg, TIME_IMMEDIATE);
+      if (msg != RDY_OK)
+        saturated = TRUE;
+    }
+    else {
+      /* Provides a visual feedback about the system.*/
+      if (++cnt >= 500) {
+        cnt = 0;
+        palTogglePad(GPIO0, GPIO0_LED2);
+      }
+    }
+  }
+}
+
+/*
+ * GPT1 callback.
+ */
+static void gpt1cb(GPTDriver *gptp) {
+  msg_t msg;
+
+  (void)gptp;
+  chSysLockFromIsr();
+  msg = chMBPostI(&mb[0], MSG_SEND_RIGHT);
+  if (msg != RDY_OK)
+    saturated = TRUE;
+  chSysUnlockFromIsr();
+}
+
+/*
+ * GPT2 callback.
+ */
+static void gpt2cb(GPTDriver *gptp) {
+  msg_t msg;
+
+  (void)gptp;
+  chSysLockFromIsr();
+  msg = chMBPostI(&mb[NUM_THREADS - 1], MSG_SEND_LEFT);
+  if (msg != RDY_OK)
+    saturated = TRUE;
+  chSysUnlockFromIsr();
+}
+
+/*
+ * GPT1 configuration.
+ */
+static const GPTConfig gpt1cfg = {
+  1000000,  /* 1MHz timer clock.*/
+  gpt1cb    /* Timer callback.*/
+};
+
+/*
+ * GPT2 configuration.
+ */
+static const GPTConfig gpt2cfg = {
+  1000000,  /* 1MHz timer clock.*/
+  gpt2cb    /* Timer callback.*/
+};
+
+
+/*===========================================================================*/
+/* Generic demo code.                                                        */
+/*===========================================================================*/
+
+static void print(char *p) {
+
+  while (*p) {
+    chSequentialStreamPut(&SD1, *p++);
+  }
+}
+
+static void println(char *p) {
+
+  while (*p) {
+    chSequentialStreamPut(&SD1, *p++);
+  }
+  chSequentialStreamWrite(&SD1, (uint8_t *)"\r\n", 2);
+}
+
+static void printn(uint32_t n) {
+  char buf[16], *p;
+
+  if (!n)
+    chSequentialStreamPut(&SD1, '0');
+  else {
+    p = buf;
+    while (n)
+      *p++ = (n % 10) + '0', n /= 10;
+    while (p > buf)
+      chSequentialStreamPut(&SD1, *--p);
+  }
+}
+
+/*
+ * Application entry point.
+ */
+int main(void) {
+  unsigned i;
+  gptcnt_t interval, threshold, worst;
+
+  /*
+   * System initializations.
+   * - HAL initialization, this also initializes the configured device drivers
+   *   and performs the board-specific initializations.
+   * - Kernel initialization, the main() function becomes a thread and the
+   *   RTOS is active.
+   */
+  halInit();
+  chSysInit();
+
+  /*
+   * Prepares the Serial driver 2 and GPT drivers 1 and 2.
+   */
+  sdStart(&SD1, NULL);          /* Default is 38400-8-N-1.*/
+  gptStart(&GPTD1, &gpt1cfg);
+  gptStart(&GPTD2, &gpt2cfg);
+
+  /*
+   * Initializes the mailboxes and creates the worker threads.
+   */
+  for (i = 0; i < NUM_THREADS; i++) {
+    chMBInit(&mb[i], b[i], MAILBOX_SIZE);
+    chThdCreateStatic(waWorkerThread[i], sizeof waWorkerThread[i],
+                      NORMALPRIO - 20, WorkerThread, (void *)i);
+  }
+
+  /*
+   * Test procedure.
+   */
+  println("");
+  println("*** ChibiOS/RT IRQ-STORM long duration test");
+  println("***");
+  print("*** Kernel:       ");
+  println(CH_KERNEL_VERSION);
+#ifdef CH_COMPILER_NAME
+  print("*** Compiler:     ");
+  println(CH_COMPILER_NAME);
+#endif
+  print("*** Architecture: ");
+  println(CH_ARCHITECTURE_NAME);
+#ifdef CH_CORE_VARIANT_NAME
+  print("*** Core Variant: ");
+  println(CH_CORE_VARIANT_NAME);
+#endif
+#ifdef CH_PORT_INFO
+  print("*** Port Info:    ");
+  println(CH_PORT_INFO);
+#endif
+#ifdef PLATFORM_NAME
+  print("*** Platform:     ");
+  println(PLATFORM_NAME);
+#endif
+#ifdef BOARD_NAME
+  print("*** Test Board:   ");
+  println(BOARD_NAME);
+#endif
+  println("***");
+  print("*** System Clock: ");
+  printn(LPC11xx_SYSCLK);
+  println("");
+  print("*** Iterations:   ");
+  printn(ITERATIONS);
+  println("");
+  print("*** Randomize:    ");
+  printn(RANDOMIZE);
+  println("");
+  print("*** Threads:      ");
+  printn(NUM_THREADS);
+  println("");
+  print("*** Mailbox size: ");
+  printn(MAILBOX_SIZE);
+  println("");
+
+  println("");
+  worst = 0;
+  for (i = 1; i <= ITERATIONS; i++){
+    print("Iteration ");
+    printn(i);
+    println("");
+    saturated = FALSE;
+    threshold = 0;
+    for (interval = 2000; interval >= 20; interval -= interval / 10) {
+      gptStartContinuous(&GPTD1, interval - 1); /* Slightly out of phase.*/
+      gptStartContinuous(&GPTD2, interval + 1); /* Slightly out of phase.*/
+      chThdSleepMilliseconds(1000);
+      gptStopTimer(&GPTD1);
+      gptStopTimer(&GPTD2);
+      if (!saturated)
+        print(".");
+      else {
+        print("#");
+        if (threshold == 0)
+          threshold = interval;
+      }
+    }
+    /* Gives the worker threads a chance to empty the mailboxes before next
+       cycle.*/
+    chThdSleepMilliseconds(20);
+    println("");
+    print("Saturated at ");
+    printn(threshold);
+    println(" uS");
+    println("");
+    if (threshold > worst)
+      worst = threshold;
+  }
+  gptStopTimer(&GPTD1);
+  gptStopTimer(&GPTD2);
+
+  print("Worst case at ");
+  printn(worst);
+  println(" uS");
+  println("");
+  println("Test Complete");
+
+  /*
+   * Normal main() thread activity, nothing in this test.
+   */
+  while (TRUE) {
+    chThdSleepMilliseconds(5000);
+  }
+  return 0;
+}