Core1106 Problem with USB
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my goal is to use usb to flash the core1106 module from a PC. After the purchase, I have never been able to achieve normal usb operation. Every time I try, I get a device descriptor request failure. This error also persists when switching to firmware download mode (uboot->download). DN and DP are connected directly, respectively, to USB_VBUS, I connected it to the 5v input of the module, the board starts up and it can communicate with it via debug uart. USB_VBUSDET is connected to 3.3 according to the technical description. What could be the problem?
Hello, it is suggested to refer to the schematic of Luckfox Pico Pi and connect USB_VBUSDET to 3.3V through resistor voltage division , or directly connect it to 3.3V through a resistor.
A failure in the device descriptor request may be due to layout issues. Please confirm that the USB DN and DP are differential routed and the impedance standard is 90 ohms.
A failure in the device descriptor request may be due to layout issues. Please confirm that the USB DN and DP are differential routed and the impedance standard is 90 ohms.
Isn't USB_VBUS_DET connected to 3.3V via a resistor divider, not 1.8V?
If VBUS is 5V then USB_VBUS_DET is 3.3V (more exactly 3.214V).
If VBUS is 5V then USB_VBUS_DET is 3.3V (more exactly 3.214V).
I did not examine the schematic diagram in my previous post and made a mistake; I have now corrected it.