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diff --git a/main.c b/main.c
new file mode 100644
index 0000000..511a599
--- /dev/null
+++ b/main.c
@@ -0,0 +1,47 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include "teensy3/core_pins.h"
+#include "teensy3/usb_seremu.h"
+#include "teensy3/usb_rawhid.h"
+
+ssize_t _write(int fd, const void *buf, size_t nbyte)
+{
+	char tbuf[64];
+	int ret;
+
+	if (fd != 1 && fd != 2) {
+		snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd);
+		usb_seremu_write(tbuf, strlen(tbuf));
+	}
+
+	ret = usb_seremu_write(buf, nbyte);
+	return ret < 0 ? ret : nbyte;
+}
+
+void yield(void)
+{
+}
+
+int main(void)
+{
+	int ret;
+
+	delay(1000); // wait for usb..
+
+	printf("starting, rawhid: %d\n", usb_rawhid_available());
+
+	// ret = usb_rawhid_recv(buf, 2000);
+	// ret = usb_rawhid_send(buf, 2000);
+
+	pinMode(13, OUTPUT);
+	pinMode(14, OUTPUT);
+	while (1) {
+		CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
+		CORE_PIN14_PORTSET = CORE_PIN14_BITMASK;
+		delay(500*4);
+		CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
+		CORE_PIN14_PORTCLEAR = CORE_PIN14_BITMASK;
+		delay(500*4);
+	}
+}