I hope I am at the right place.
I used some old design I found out on the internet a few years ago, to make an Ameba Realtek writer. My goal is to use it for uploading sketches through Arduino IDE. But, I get stuck at the very first step.
This is the schematic.
As I was short of some components I used 22pF instead of 20pF for C2 and C3 and 1.8K instead of 1.5K for R5. The rest is as it is.
When I plug this board into a PC I can see it in my Device Manager as unrecognized (unknown). So far so good.
The next step is to upload a new firmware from an Amebaiot site. To do so, I need to put it in a drive mode with two buttons. This is the place I stuck. By clicking buttons as it shows on the site I provide, it cannot mount as a drive.
This looks interesting, I assume that the target device is the RTL8195 module?
I am not familiar with the DAP, but comparing your schematic with that found at Ameba1 – Realtek IoT/Wi-Fi MCU Solutions, it seems like there are some differences in the DAP portion of the schematic, not sure if this will cause any issues.
Are you starting with a blank LPC11U35 chip? I have a guess that the chip itself may need a bootloader or some lower level firmware, in order to enable the two button drive mode to update firmware.
I am stuck on firmware. I can not put this DAP into USB device so I can upload firmware on it. In my opinion, it could be wrong schematic, bad soldering or something else.
RTL8710 is the goal, but for now, it is way ahead.
The problem is I can not mount DAP as a USB device to upload the firmware.
Could it be because of these few changed components?
On the link I provide, it says all about the procedure. All I need is 2 buttons, which I have. But it still doesn"t mount as a USB device.
