A 100nF decoupling capacitor is placed physically close to the Flash chip's VCC pin.
The RP2040 has no internal flash. The YDRP2040 likely uses a W25Q32 (4MB) or W25Q64 (8MB) SPI flash chip.
On the schematic, look for:
Common error: Incorrect pull-ups on these lines can cause "No flash detected" errors in your IDE. ydrp2040 schematic
The YDRP2040 typically uses a two-stage power architecture:
What to look for: A missing capacitor near the regulator can cause random resets. A 100nF decoupling capacitor is placed physically close
Since the YDRP2040 isn’t an official Raspberry Pi product, try these sources:
The schematic will show:
The USB portion of the schematic (Micro-USB or USB-C) includes:
If the schematic shows a USB-C connector, pay attention to the CC1 and CC2 resistors (5.1k to GND) for proper orientation detection. The RP2040 has no internal flash