25Q128 flash and garbage data over SPI

Question

I have a logic analyzer coming in the mail, but thought I might ask for help here first.

I soldered the 25Q128 flash onto an adapter and wired it up to an Arduino UNO clone as you can see in the images below. I get nonsense data in the serial monitor. The 4 10k resistors are connected in parallel to GND and there are 4.7k resistors on the SCK, MISO, MOSI and CS lines. I am using the TestFlash sketch from the SPIMemory Arduino library by Marzogh. Could it be a bad soldering joint? Or am I missing something?

I used this as a guide also:

https://www.14core.com/wiring-the-winbond-w25qxx-spi-serial-flash-memory-with-microcontroller/

https://www.14core.com/wp-content/uploads/2017/09/windbond-spi-flash-memory-W25Q80BV-8bit-storage-wiring-guide.jpg

Here are some pictures and a diagram.

Setup

Breadboard

Closeup

Arduino

Fritzing diagram

• Majenko: That "guide" is bad. You don't want any resistors on MISO. Just connect it direct between the Arduino and the chip.

Answer 1

You will be better to buy one of these from aliExpress. enter image description here

here's de pinout connections to an arduino:

• Pin 1 - CS

• Pin 2 - D0 (I/O1)

• Pin 3 - VCC (I/O2)

• Pin 4 - GND

• Pin 5 - Di

• Pin 6 - CLK

• Pin 7 - VCC (I/O)

• Pin 8 - VCC

this connection setup does not make use of the full data parallel async I/O, as you can see only I/O1 is connected to D0. This way has much slower data transfers.

• Juraj: what is "pin 1"? Uno TX pin?
• Miguel Tomás: CS = chip select
• Juraj: I ask what are the pins on the left. Uno pins? you use the TX pin as CS?
• Miguel Tomás: you can use any digital pin for CS