我使用的是 esp32-s3 使用usb host-cdc-acm 历程。
从机用的是 stm32f407 标准库 的usb-cdc-vcp 历程,
从机和PC端连接,可以识别到设备,
从机和ESP32相连识别不到设备???
程序错误点: 这个函数 (_check_client_opened_device(client_obj, dev_addr)) 返回来错误标志
esp_err_t usb_host_device_open(usb_host_client_handle_t client_hdl, uint8_t dev_addr, usb_device_handle_t *dev_hdl_ret)
{
HOST_CHECK(dev_addr > 0 && client_hdl != NULL && dev_hdl_ret != NULL, ESP_ERR_INVALID_ARG);
client_t *client_obj = (client_t *)client_hdl;
esp_err_t ret;
usb_device_handle_t dev_hdl;
ret = usbh_dev_open(dev_addr, &dev_hdl);
if (ret != ESP_OK) {
goto exit;
}
HOST_ENTER_CRITICAL();
if (_check_client_opened_device(client_obj, dev_addr)) {
//Client has already opened the device. Close it and return an error
ret = ESP_ERR_INVALID_STATE;
HOST_EXIT_CRITICAL();
ESP_LOGE("----","ESP_ERROR_CHECK cong zhe li mian guan diao le ");
goto already_opened;
}
//Record in client object that we have opened the device of this address
_record_client_opened_device(client_obj, dev_addr);
HOST_EXIT_CRITICAL();
*dev_hdl_ret = dev_hdl;
ret = ESP_OK;
ESP_LOGE("----","_record_client_opened_device ok ");
return ret;
already_opened:
ESP_ERROR_CHECK(usbh_dev_close(dev_hdl));
exit:
return ret;
}
请问一下 这是什么原因导致的??
我用stm32的 HAL库历程没有问题:这是什么情况
esp32s3开发板 使用USB -host-cdc-acm历程 识别不成功
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