systemcmds: added reflect command for USB testing

src/systemcmds/reflect/module.mk

@@ -0,0 +1,41 @@
+############################################################################
+#
+#   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name PX4 nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+#
+# Dump file utility
+#
+
+MODULE_COMMAND	 = reflect
+SRCS		 = reflect.c
+
+MAXOPTIMIZATION	 = -Os

src/systemcmds/reflect/reflect.c

@@ -0,0 +1,111 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 Andrew Tridgell. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file reflect.c
+ *
+ * simple data reflector for load testing terminals (especially USB)
+ *
+ * @author Andrew Tridgell
+ */
+
+#include <nuttx/config.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <systemlib/err.h>
+
+__EXPORT int reflect_main(int argc, char *argv[]);
+
+// memory corruption checking
+#define MAX_BLOCKS 1000
+static uint32_t nblocks;
+struct block {
+    uint32_t v[256];
+};
+static struct block *blocks[MAX_BLOCKS];
+
+#define VALUE(i) ((i*7) ^ 0xDEADBEEF)
+
+static void allocate_blocks(void)
+{
+    while (nblocks < MAX_BLOCKS) {
+        blocks[nblocks] = calloc(1, sizeof(struct block));
+        if (blocks[nblocks] == NULL) {
+            break;
+        }
+        for (uint32_t i=0; i<sizeof(blocks[nblocks]->v)/sizeof(uint32_t); i++) {
+            blocks[nblocks]->v[i] = VALUE(i);
+        }
+        nblocks++;
+    }
+    printf("Allocated %u blocks\n", nblocks);
+}
+
+static void check_blocks(void)
+{
+    for (uint32_t n=0; n<nblocks; n++) {
+        for (uint32_t i=0; i<sizeof(blocks[nblocks]->v)/sizeof(uint32_t); i++) {
+            assert(blocks[n]->v[i] == VALUE(i));
+        }
+    }
+}
+
+int
+reflect_main(int argc, char *argv[])
+{
+    uint32_t total = 0;
+    printf("Starting reflector\n");
+
+    allocate_blocks();
+
+    while (true) {
+        char buf[128];
+        ssize_t n = read(0, buf, sizeof(buf));
+        if (n < 0) {
+            break;
+        }
+        if (n > 0) {
+            write(1, buf, n);
+        }
+        total += n;
+        if (total > 1024000) {
+            check_blocks();
+            total = 0;
+        }
+    }
+    return OK;
+}