diff --git a/software/boards/hydrausb3/hydrausb3_usb_devbulk_vid_pid.h b/software/boards/hydrausb3/hydrausb3_usb_devbulk_vid_pid.h
new file mode 100644
index 0000000..9f0cce9
--- /dev/null
+++ b/software/boards/hydrausb3/hydrausb3_usb_devbulk_vid_pid.h
@@ -0,0 +1,26 @@
+/********************************** (C) COPYRIGHT *******************************
+* File Name          : hydrausb3_usb_devbulk_vid_pid.h
+* Author             : bvernoux
+* Version            : V1.0
+* Date               : 2022/08/20
+* Description        :
+* Copyright (c) 2022 Benjamin VERNOUX
+* SPDX-License-Identifier: Apache-2.0
+*******************************************************************************/
+/*
+Use default USB PID/VID if not configured with usb_descriptor_set_usb_vid_pid()
+https://github.com/obdev/v-usb/blob/master/usbdrv/USB-IDs-for-free.txt
+PID dec (hex) | VID dec (hex) | Description of use
+==============+===============+============================================
+1500 (0x05dc) | 5824 (0x16c0) | For Vendor Class devices with libusb
+*/
+// Default USB Vendor ID
+// Default VID 0x16C0 "Van Ooijen Technische Informatica"
+#define USB_VID_BYTE_MSB (0x16)
+#define USB_VID_BYTE_LSB (0xC0)
+#define USB_VID ((USB_VID_BYTE_MSB << 8) | USB_VID_BYTE_LSB)
+// Default USB Product ID
+// Default PID 0x05DC
+#define USB_PID_BYTE_MSB (0x05)
+#define USB_PID_BYTE_LSB (0xDC)
+#define USB_PID ((USB_PID_BYTE_MSB << 8) | USB_PID_BYTE_LSB)
diff --git a/software/boards/hydrausb3/usb_cmd.c b/software/boards/hydrausb3/usb_cmd.c
new file mode 100644
index 0000000..597b4eb
--- /dev/null
+++ b/software/boards/hydrausb3/usb_cmd.c
@@ -0,0 +1,81 @@
+/********************************** (C) COPYRIGHT *******************************
+* File Name          : usb_cmd.c
+* Author             : bvernoux
+* Version            : V1.0
+* Date               : 2022/08/20
+* Description 		 :
+* Copyright (c) 2022 Benjamin VERNOUX
+* SPDX-License-Identifier: Apache-2.0
+*******************************************************************************/
+#include "CH56x_common.h"
+#include "CH56x_usb20_devbulk.h"
+#include "CH56x_usb30_devbulk.h"
+#include "CH56x_usb30_devbulk_LIB.h"
+
+#include "CH56x_debug_log.h"
+#include "usb_cmd.h"
+
+
+/*******************************************************************************
+ * @fn     usb_cmd_rx
+ *
+ * @brief  Callback called by USB2 & USB3 endpoint 1
+ *         - For USB3 this usb_cmd_rx() is called from IRQ(USBHS_IRQHandler)
+ *           with rx_usb_dma_buff containing 4096 bytes (DEF_ENDP1_MAX_SIZE)
+ *         - For USB2 this usb_cmd_rx() is called from IRQ USB30_IRQHandler->EP1_OUT_Callback)
+ *           with rx_usb_dma_buff containing 4096 bytes (DEF_ENDP1_MAX_SIZE)
+ *
+ * @param  usb_type: USB Type (USB2 HS or USB3 SS)
+ * @param  rx_usb_dma_buff: USB RX DMA buffer containing 4096 bytes of data
+ *                          Data received from USB
+ * @param  tx_usb_dma_buff: USB TX DMA buffer containing 4096 bytes of data
+ *                          Data to be transmitted over USB
+ *
+ * @return size of data to be sent to USB host
+ */
+
+
+#define RISCV_FENCE(p, s) \
+	__asm__ __volatile__ ("fence " #p "," #s : : : "memory")
+
+/* These barriers need to enforce ordering on both devices or memory. */
+#define mb()		RISCV_FENCE(iorw,iorw)
+#define rmb()		RISCV_FENCE(ir,ir)
+#define wmb()		RISCV_FENCE(ow,ow)
+
+extern volatile int usb_cmd_rxed;
+extern volatile uint8_t usb_cmd[11];
+extern volatile uint8_t usb_cmd_len;
+extern volatile int ep1_out_nack;
+
+// return 1 for busy, 0 for OK
+int usb_cmd_rx(e_usb_type usb_type, uint8_t* rx_usb_dma_buff, uint8_t* tx_usb_dma_buff)
+{
+	if (usb_cmd_rxed) { // already processing...
+	    ep1_out_nack++;
+	    return 1;
+	}
+	switch (rx_usb_dma_buff[0]) {
+	    case 'U': {
+	        if (rx_usb_dma_buff[1] == 'w') {
+                usb_cmd_len = rx_usb_dma_buff[2];
+                memcpy(usb_cmd, &rx_usb_dma_buff[1], usb_cmd_len + 2);
+                mb();
+                usb_cmd_rxed = 1;
+            }
+            if (rx_usb_dma_buff[1] == 'r') {
+                usb_cmd_len = rx_usb_dma_buff[2];
+                usb_cmd[0] = 'r';
+                mb();
+                usb_cmd_rxed = 1;
+            }
+            if (rx_usb_dma_buff[1] != 'r' && rx_usb_dma_buff[1] != 'w')
+                printf("Big PROTO error!\n");
+            break;
+	    }
+	    default: {
+	        printf("Big error!\n");
+	    }
+	}
+	return 0;
+}
diff --git a/software/boards/hydrausb3/usb_cmd.h b/software/boards/hydrausb3/usb_cmd.h
new file mode 100644
index 0000000..b6f0a50
--- /dev/null
+++ b/software/boards/hydrausb3/usb_cmd.h
@@ -0,0 +1,23 @@
+/********************************** (C) COPYRIGHT *******************************
+* File Name          : usb_cmd.h
+* Author             : bvernoux
+* Version            : V1.0
+* Date               : 2022/08/20
+* Description        :
+* Copyright (c) 2022 Benjamin VERNOUX
+* SPDX-License-Identifier: Apache-2.0
+*******************************************************************************/
+#ifndef USB_CMD_H_
+#define USB_CMD_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "CH56x_usb_devbulk_desc_cmd.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* USB_CMD_H_ */