Hardware design - EC200U-CN + FLASH - NOR Memory IC

WIFI/BT Hardware
1

Hi all,

This doubt is regarding hardware design.

My previous hardware designer has designed hardware in which he had connected one FLASH - NOR Memory IC to PCM_DIN, PCM_DOUT, PCM_SYNC, PCM_CLK.

image
image634×397 10 KB

But I doubt that it is wrong, my EC200U-CN has firmware version - EC200UCNAAR02A09M08, which does not support any OpenCPU(which can be used to convert PCM to SPI).

So, help me decide that this connection is wrong, FLASH - NOR Memory IC should be connected to MCU if my EC200U-CN has EC200UCNAAR02A09M08 firmware version.

2

Hi Naresh,

Thank you for contacting us.

  • The EC200U-CN module with firmware EC200UCNAAR02A09M08 does not support OpenCPU, which means you cannot use PCM pins as SPI through software conversion.
  • PCM (Pulse Code Modulation) interface is designed for audio data transfer, not for SPI communication.
  • A NOR Flash memory IC typically requires an SPI interface (pins like MOSI, MISO, CS, CLK), not PCM.

Regards,
Fazrul

3

Hi Fazrul,

Thank you for the response. Noted on the valuable points.
And I must say that the hardware designed shared in previous post is wrong. And I must connect NOR Flash directly to MCU not Quectel.

Further, I can connect SD-card to module and access it with module only if OpenCPU is supported by the module.

Regards