ESP32-PICO-D4 external SPRAM

chuledeco
Posts: 7
Joined: Thu Feb 13, 2020 3:22 pm

ESP32-PICO-D4 external SPRAM

Postby chuledeco » Thu Feb 13, 2020 3:32 pm

Hello and thanks in advance

I was trying to understand why I can't add my external PSRAM working with my ESP32-pico-d4 chip

I'm using ESP-IDF v4.0 with eclipse. My PSRAM chip is LY68L6400 and is connected as described below:

PSRAM ESP32-PICO-D4
CS IO17 (pin 27)
SCLK CLK (pin 31)
SIO0/SI SD0
SIO1/SO SD1
SIO2 SD2
SIO3 SD3

The CS is configured in the menuconfig

In the spiram_psram.c file I see the same configuration I have:

Code: Select all

#define PSRAM_SPIQ_SD0_IO          7
#define PSRAM_SPID_SD1_IO          8
#define PSRAM_SPIWP_SD3_IO         10
#define PSRAM_SPIHD_SD2_IO         9
but after loading anything to the chip I get:


I (225) psram: This chip is ESP32-PICO
E (230) cpu_start: Failed to init external RAM!
abort() was called at PC 0x4008136e on core 0

My PSRAM chip is connected to the VDD_SDIO and the voltage is 3.3V (measured)

With my oscilloscope, I can see signals in all pins except SIO3

If anyone can help me a bit I'll be very thanked because I'm very stuck with that.

Thanks in advance, Julian
Last edited by chuledeco on Wed Feb 19, 2020 6:07 pm, edited 2 times in total.

ESP_Vikram
Posts: 24
Joined: Fri Nov 23, 2018 12:07 pm

Re: ESP32-PICO-D4 external SPRAM

Postby ESP_Vikram » Thu Feb 13, 2020 3:54 pm

Maybe not useful for you...

But, I had similar problem few months back.

Turns out I was using pin 9 for CLK.


Following change worked for me...

If you go to $IDF_PATH/components/esp32/spiram_psram.c

There is a define:

Code: Select all

#define PICO_PSRAM_CLK_IO          6
I changed this to

Code: Select all

#define PICO_PSRAM_CLK_IO          9
...and it worked.

Maybe similar change you are missing?

chuledeco
Posts: 7
Joined: Thu Feb 13, 2020 3:22 pm

Re: ESP32-PICO-D4 external SPRAM

Postby chuledeco » Thu Feb 13, 2020 4:14 pm

ESP_Vikram wrote:
Thu Feb 13, 2020 3:54 pm
Maybe not useful for you...

But, I had similar problem few months back.

Turns out I was using pin 9 for CLK.


Following change worked for me...

If you go to $IDF_PATH/components/esp32/spiram_psram.c

There is a define:

Code: Select all

#define PICO_PSRAM_CLK_IO          6
I changed this to

Code: Select all

#define PICO_PSRAM_CLK_IO          9
...and it worked.

Maybe similar change you are missing?
Hello Vikram, thanks for your answer

I have the PSRAM SCLK pin connected to the CLK pin of the ESP32-PICO-D4 which is number GPIO6. It seems in my case I'm using the default PICO_PSRAM_CLK_IO

Thanks again, Julian

chuledeco
Posts: 7
Joined: Thu Feb 13, 2020 3:22 pm

Re: ESP32-PICO-D4 external SPRAM

Postby chuledeco » Fri Feb 14, 2020 9:39 am

ESP_Vikram wrote:
Thu Feb 13, 2020 3:54 pm
Maybe not useful for you...

But, I had similar problem few months back.

Turns out I was using pin 9 for CLK.


Following change worked for me...

If you go to $IDF_PATH/components/esp32/spiram_psram.c

There is a define:

Code: Select all

#define PICO_PSRAM_CLK_IO          6
I changed this to

Code: Select all

#define PICO_PSRAM_CLK_IO          9
...and it worked.

Maybe similar change you are missing?
Can you Vikram please tell me if the rest of your pines was connected as I did?
Also, did you use IDF 4.0?
Finally, did you configure something else than turn on SPI RAM on the menuconfig and set the CS pin?

Thanks again

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