feat(extiotest): Add testing tool for real EXTIO devices

A small but helpful tool to run a quick functional test
of a real EXTIO device connected to the target machine.

src/main/extiotest/Module.mk

@@ -0,0 +1,9 @@
+exes            += extiotest \
+
+libs_extiotest     := \
+    extiodrv \
+    extio \
+    util \
+
+src_extiotest      := \
+    main.c \

src/main/extiotest/main.c

@@ -0,0 +1,55 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <windows.h>
+
+#include "extiodrv/extio.h"
+
+#include "util/log.h"
+
+int main(int argc, char **argv)
+{
+    HRESULT hr;
+    const char *port;
+    HANDLE handle;
+    struct extiodrv_extio_pad_lights pad_lights[EXTIO_PAD_LIGHT_MAX_PLAYERS];
+
+    if (argc < 2) {
+        fprintf(stderr, "Basic functional test of EXTIO\n");
+        fprintf(stderr, "Usage: %s COM_PORT\n", argv[0]);
+        fprintf(stderr, "  COM_PORT: For example COM1\n");
+    }
+
+    log_to_writer(log_writer_stderr, NULL);
+    log_set_level(LOG_LEVEL_MISC);
+
+    port = argv[1];
+
+    hr = extiodrv_device_open(port, &handle);
+
+    if (FAILED(hr)) {
+        fprintf(stderr, "Opening extio at port '%s' failed: %lX\n", port, hr);
+        return -1;
+    }
+
+    memset(&pad_lights, 0, sizeof(pad_lights));
+
+    hr = extiodrv_extio_transfer(
+        handle, EXTIODRV_EXTIO_SENSOR_READ_MODE_ALL, pad_lights, false);
+
+    if (FAILED(hr)) {
+        fprintf(stderr, "Extio transfer failed: %lX\n", hr);
+        return -1;
+    }
+
+    hr = extiodrv_device_close(&handle);
+
+    if (FAILED(hr)) {
+        fprintf(stderr, "Closing extio failed: %lX", hr);
+        return -1;
+    }
+
+    return 0;
+}