ESP USB HOST Library Issue With Wireless Keypad
Posted: Tue Dec 23, 2025 3:25 am
Helo all,
I'm woring in Arduino v2.3. using an ESP32 C3 DevKit with the ESP USB HOST library, specifically for USB Keyboards using the hid_host_example.ino, The example code seems to work with hardwired keyboards, but not with the wireless Keypad I'd like to use in my application. I can see the USB D+/D- activity on my scope and it appears that the Keypad is attempting to communicate to the ESP32, but times out with the following error
HOST: Enqueue URB error: ESP_ERR_INVALID_STATE
USB HOST: EP command error: ESP_ERR_INVALID_STATE
I attempted to track down the error in the library, but was unable to locate the error.
I'm hoping there are some parameters I can change in the library that will allow the Keypad to connect.
Any help would be appreciated.
Thanks!
I'm woring in Arduino v2.3. using an ESP32 C3 DevKit with the ESP USB HOST library, specifically for USB Keyboards using the hid_host_example.ino, The example code seems to work with hardwired keyboards, but not with the wireless Keypad I'd like to use in my application. I can see the USB D+/D- activity on my scope and it appears that the Keypad is attempting to communicate to the ESP32, but times out with the following error
HOST: Enqueue URB error: ESP_ERR_INVALID_STATE
USB HOST: EP command error: ESP_ERR_INVALID_STATE
I attempted to track down the error in the library, but was unable to locate the error.
I'm hoping there are some parameters I can change in the library that will allow the Keypad to connect.
Any help would be appreciated.
Thanks!