diff --git a/CMakeLists.txt b/CMakeLists.txt
index 44de74d..b72355d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ pico_sdk_init()
 
 add_executable(picomap
 	picomap.cpp
+	usb.cpp
 	w6300/w6300.cpp
 )
 
@@ -23,9 +24,9 @@ target_compile_options(picomap PRIVATE -Wall -Wextra -Wno-unused-parameter)
 
 pico_generate_pio_header(picomap ${CMAKE_CURRENT_LIST_DIR}/w6300/qspi.pio)
 
-pico_enable_stdio_usb(picomap 1)
+pico_enable_stdio_usb(picomap 0)
 pico_enable_stdio_uart(picomap 0)
 
 pico_add_extra_outputs(picomap)
 
-target_link_libraries(picomap pico_stdlib hardware_pio hardware_spi hardware_dma hardware_clocks)
+target_link_libraries(picomap pico_stdlib tinyusb_device tinyusb_board hardware_pio hardware_spi hardware_dma hardware_clocks)
diff --git a/include/tusb_config.h b/include/tusb_config.h
new file mode 100644
index 0000000..f2d0b6d
--- /dev/null
+++ b/include/tusb_config.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#define CFG_TUSB_RHPORT0_MODE OPT_MODE_DEVICE
+#define CFG_TUD_CDC 1
+#define CFG_TUD_CDC_RX_BUFSIZE 256
+#define CFG_TUD_CDC_TX_BUFSIZE 256
+#define CFG_TUD_CDC_EP_BUFSIZE 64
diff --git a/picomap.cpp b/picomap.cpp
index 36072f1..f6dcab4 100644
--- a/picomap.cpp
+++ b/picomap.cpp
@@ -1,16 +1,28 @@
-#include <stdio.h>
 #include "pico/stdlib.h"
 #include "pico/bootrom.h"
 #include "pico/unique_id.h"
+#include "tusb.h"
 #include "wire.h"
 
 #include "w6300.h"
 
-static void send_bytes(const std::vector<uint8_t> &data) {
-    for (auto b : data) {
-        putchar(b);
+static void usb_write(const uint8_t* data, uint32_t len) {
+    while (len > 0) {
+        uint32_t avail = tud_cdc_write_available();
+        if (avail == 0) {
+            tud_task();
+            continue;
+        }
+        uint32_t chunk = len < avail ? len : avail;
+        tud_cdc_write(data, chunk);
+        tud_cdc_write_flush();
+        data += chunk;
+        len -= chunk;
     }
-    stdio_flush();
+}
+
+static void send_bytes(const std::vector<uint8_t> &data) {
+    usb_write(data.data(), data.size());
 }
 
 static bool w6300_init() {
@@ -35,20 +47,22 @@ static bool w6300_init() {
 }
 
 int main() {
-    stdio_init_all();
-    stdio_set_translate_crlf(&stdio_usb, false);
+    tusb_init();
 
     if (!w6300_init()) {
-        printf("W6300 init failed\n");
     }
 
     static static_vector<uint8_t, 256> rx_buf;
 
     while (true) {
-        int c = getchar_timeout_us(100000);
-        if (c == PICO_ERROR_TIMEOUT) continue;
+        tud_task();
 
-        rx_buf.push_back(static_cast<uint8_t>(c));
+        if (!tud_cdc_available()) continue;
+
+        uint8_t byte;
+        if (tud_cdc_read(&byte, 1) != 1) continue;
+
+        rx_buf.push_back(byte);
 
         auto msg = try_decode(rx_buf);
         if (!msg) {
diff --git a/usb.cpp b/usb.cpp
new file mode 100644
index 0000000..6cf1c64
--- /dev/null
+++ b/usb.cpp
@@ -0,0 +1,82 @@
+#include <cstring>
+#include "pico/unique_id.h"
+#include "tusb.h"
+
+constexpr uint16_t USB_VID = 0x2E8A;
+constexpr uint16_t USB_PID = 0x000A;
+
+static constexpr tusb_desc_device_t desc_device = {
+    sizeof(tusb_desc_device_t),
+    TUSB_DESC_DEVICE,
+    0x0200,
+    TUSB_CLASS_MISC,
+    MISC_SUBCLASS_COMMON,
+    MISC_PROTOCOL_IAD,
+    CFG_TUD_ENDPOINT0_SIZE,
+    USB_VID,
+    USB_PID,
+    0x0100,
+    1, 2, 3,
+    1,
+};
+
+enum { ITF_NUM_CDC, ITF_NUM_CDC_DATA, ITF_NUM_TOTAL };
+
+constexpr uint8_t EPNUM_CDC_NOTIF = 0x81;
+constexpr uint8_t EPNUM_CDC_OUT   = 0x02;
+constexpr uint8_t EPNUM_CDC_IN    = 0x82;
+constexpr uint16_t CONFIG_TOTAL_LEN = TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN;
+
+static uint8_t const desc_configuration[] = {
+    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
+    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 0, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
+};
+
+static constexpr const char* string_desc[] = {
+    "\x09\x04",
+    "picomap",
+    "picomap",
+    nullptr,
+};
+
+static uint16_t desc_str_buf[33];
+
+extern "C" {
+
+uint8_t const* tud_descriptor_device_cb(void) {
+    return reinterpret_cast<uint8_t const*>(&desc_device);
+}
+
+uint8_t const* tud_descriptor_configuration_cb(uint8_t index) {
+    return desc_configuration;
+}
+
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
+    uint8_t chr_count;
+
+    if (index == 0) {
+        memcpy(&desc_str_buf[1], string_desc[0], 2);
+        chr_count = 1;
+    } else if (index == 3) {
+        pico_unique_board_id_t uid;
+        pico_get_unique_board_id(&uid);
+        chr_count = 0;
+        for (int i = 0; i < 8; i++) {
+            desc_str_buf[1 + chr_count++] = "0123456789ABCDEF"[uid.id[i] >> 4];
+            desc_str_buf[1 + chr_count++] = "0123456789ABCDEF"[uid.id[i] & 0xF];
+        }
+    } else {
+        if (index >= sizeof(string_desc) / sizeof(string_desc[0])) return nullptr;
+        const char* str = string_desc[index];
+        if (!str) return nullptr;
+        chr_count = strlen(str);
+        if (chr_count > 31) chr_count = 31;
+        for (uint8_t i = 0; i < chr_count; i++)
+            desc_str_buf[1 + i] = str[i];
+    }
+
+    desc_str_buf[0] = static_cast<uint16_t>((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
+    return desc_str_buf;
+}
+
+} // extern "C"
diff --git a/w6300/w6300.cpp b/w6300/w6300.cpp
index 0be652c..4b786b0 100644
--- a/w6300/w6300.cpp
+++ b/w6300/w6300.cpp
@@ -1,4 +1,3 @@
-#include <cstdio>
 #include <cstring>
 #include <initializer_list>
 #include "pico/stdlib.h"