Reading bulk transfers

Makefile

@@ -0,0 +1,4 @@
+CFLAGS=$(shell pkg-config --cflags libusb-1.0)
+LDFLAGS=$(shell pkg-config --libs libusb-1.0)
+
+all: hdjd

hdjd.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <libusb.h>
+
+/*
+ * Some things I use for debugging 
+ */
+#ifdef NODUMP
+#define DUMPf(fmt, args...)
+#else
+#define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
+#endif
+#define DUMP() DUMPf("")
+#define DUMP_d(v) DUMPf("%s = %d", #v, v)
+#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
+#define DUMP_s(v) DUMPf("%s = %s", #v, v)
+#define DUMP_c(v) DUMPf("%s = '%c' (0x%02x)", #v, v, v)
+#define DUMP_p(v) DUMPf("%s = %p", #v, v)
+
+
+int
+main(int argc, char **argv)
+{
+    struct libusb_version *version;
+    struct libusb_device_handle *handle;
+    int             ret;
+
+    if (libusb_init(NULL) < 0) {
+        return 69;
+    }
+
+    handle = libusb_open_device_with_vid_pid(NULL, 0x06f8, 0xb105);     // MP3e2
+    if (!handle) {
+        printf("Couldn't find an MP3e2\n");
+        return 69;
+    }
+
+    while (1) {
+        uint8_t         data[12];
+        int             transferred;
+        int             i;
+
+        if ((ret = libusb_bulk_transfer(handle, 0x82,
+                                        data, sizeof data,
+                                        &transferred, 0))) {
+            break;
+        }
+
+        if (transferred % 3 > 0) {
+            fprintf(stderr, "WARNING: ignoring packet of length %d\n",
+                    transferred);
+            continue;
+        }
+
+        for (i = 0; i < transferred; i += 3) {
+            printf("%02x %02x %02x\n", data[i], data[i + 1], data[i + 2]);
+        }
+    }
+    while (0);
+
+    if (ret < 0) {
+        printf("ERROR: %s\n", libusb_error_name(ret));
+    }
+
+    libusb_exit(NULL);
+
+    return 0;
+}