SPI flash not beign found.

[DiegoMinatto]

Hello, i´m developing on a custom NRF91 board and i´m trying to access the SPI flash memory on it. When i run the code i get the following error:

<err> spi_nor: Device id 00 00 00 does not match config c2 28 17

I´m assuming my flash is not beign properly detected.

Here is my overlay.

&pinctrl {

   spi3_default: spi3_default {

      group1 {

         psels = <NRF_PSEL(SPIM_SCK, 0, 13)>,
                 <NRF_PSEL(SPIM_MISO, 0, 12)>,
                 <NRF_PSEL(SPIM_MOSI, 0, 11)>;

         nordic,drive-mode = <NRF_DRIVE_H0H1>;

      };

   };

   spi3_sleep: spi3_sleep {

      group1 {

         psels = <NRF_PSEL(SPIM_SCK, 0, 13)>,
                 <NRF_PSEL(SPIM_MISO, 0, 12)>,
                 <NRF_PSEL(SPIM_MOSI, 0, 11)>;

         low-power-enable;

      };

   };

};


&gpio0 {
   status = "okay";
};

&spi3 {
   compatible = "nordic,nrf-spim";
   status = "okay";

   pinctrl-0 = <&spi3_default>;
   pinctrl-1 = <&spi3_sleep>;

   pinctrl-names = "default", "sleep";

   cs-gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;

   w25q64jw: w25q64jw@0 {

      compatible = "jedec,spi-nor";

      label = "w25q64jw";

      reg = <0>;

      spi-max-frequency = <80000000>;

      jedec-id = [ c2 28 17  ];
      
      size = <67108864>;

   };

};

/{
   chosen {

      nordic,pm-ext-flash=&w25q64jw;

   };
};

The pins of the SPI flash are connected as follows:

MOSI - Pin 19

MISO - Pin 20

SCLK - Pin 23

What could be causing this problem ?

[Håkon Alseth]

Hi,

 

<err> spi_nor: Device id 00 00 00 does not match config c2 28 17

The module spi_nor is trying to probe your external flash, and expecting a identifier, but reading all zeros.

This is usually due to either a configuration issue or a hardware issue.

 

I would recommend that you scope your pins to see if there are any issues in the initial communication.

 

Kind regards,

Håkon

[DiegoMinatto]

Hi, i tryied to scope the pins, since my osciloscope is only 70 mhz i lowered the frequency to 40 mhz, i can´t se any data going thru the lines, could it be a configuration issue ?

The only pin that changes when i reset the board is CS, it goes from 0 to arround 3 volts and stays, it´s connected to pin 42.

[Håkon Alseth]

Hi,

 

Set a trigger on the CSN line (from high to low) and reset your board to capture the initial read.

Also check your solderings and other connections in general to see if this might be a soldering issue.

 

Kind regards,

Håkon

[DiegoMinatto]

Here is the capture from the CSN line.

Removed the memory IC, changed the code to test every pin changing output state after a few seconds and the soldering is OK.

I tested in two boards, both have the same problem.

Edit:

Probed MOSI pin and there is something.

Edit 2:

If i solder the IC back on the pads it will just stay high all the time.

[Håkon Alseth]

Hi,

 

How did the CLK and the MISO (ie. the data pin driven by the flash) look like?

DiegoMinatto said:

If i solder the IC back on the pads it will just stay high all the time.

This sounds like a short - you should double-check your solderings.

 

Kind regards,

Håkon

[DiegoMinatto]

Hello,

I probed the pins driven by the flash and got nothing. So i got back into the datasheet and discovered i picked the 1.95 V version of it by mistake. Since my circuit runs o 3.3V it probably got fried. I will replace the current flash for one rated at 3.6 V. Since it´s the same package and pinout it should work.

Thank you