问题描述

我用的是图上的开发板，镜像也是图上这个版本，在USB0上通过TYPE-C转USB-A接鼠标，万用表测输出有4.9V硬件上应该处于host状态，代码如最底下，我测试后发现鼠标灯不亮，串口3一直输出“waiting for USB mouse: open failed, -2”，所以我想问2个问题
1：USB0能做为host接鼠标吗？还是只能接电脑调试用
2：现在这个镜像能自动识别如GL850G或CH334等USB扩展芯片吗？如果USB0不能接鼠标，我想把USB1扩展下接USB转以太网和鼠标，现在镜像能不能支持
感谢解答疑问

import time
import usb # 导入底层的 usb 模块
from usb import Mouse
from machine import UART

初始化串口3 (波特率设为115200)

uart3 = UART(3, 115200)

设备启动时，在串口3输出 "hello"

uart3.write("hello\r\n")

def open_mouse():
mouse = Mouse(timeout_ms=1000, auto_reconnect=True)

while True:
    try:
        mouse.open()
        info = mouse.info()
        
        # 鼠标接上时，在串口3打印就绪信息
        msg = "USB mouse ready: %s\r\n" % str(info)
        uart3.write(msg)
        
        # 打印按键掩码信息
        btn_msg = "button masks: L=%d, R=%d, M=%d\r\n" % (
            Mouse.BTN_LEFT_MASK, 
            Mouse.BTN_RIGHT_MASK, 
            Mouse.BTN_MIDDLE_MASK
        )
        uart3.write(btn_msg)
        
        return mouse
    except OSError as err:
        # 等待鼠标接入时，也在串口3打印状态
        uart3.write("waiting for USB mouse: %s\r\n" % str(err))
        time.sleep_ms(500)

mouse = open_mouse()

while True:
frame = mouse.read(1000)
if not frame:
continue

moved = frame["has_rel"] or frame["has_abs"]
button_edge = frame["pressed_mask"] or frame["released_mask"]
wheel_move = frame["wheel"] or frame["hwheel"]

if not moved and not button_edge and not wheel_move:
    continue

# 格式化鼠标数据，并通过串口3输出
log_msg = (
    "buttons=%d pressed=%d released=%d "
    "rel=(%d,%d) abs=(%d,%d) wheel=(%d,%d)\r\n" % (
        frame["buttons"],
        frame["pressed_mask"],
        frame["released_mask"],
        frame["rel_x"],
        frame["rel_y"],
        frame["abs_x"],
        frame["abs_y"],
        frame["wheel"],
        frame["hwheel"],
    )
)
uart3.write(log_msg)

## 复现步骤
----------
![](/uploads/post/5NT2xDvYVE1.jpg)

## 硬件板卡
----------
CanMV K230 V3.0

## 软件版本
----------
CanMV_K230_V3P0_micropython_v1.7-rc1-10-g9d4fd1d_nncase_v2.11.0.img.gz