Using ESP32 PSRAM to create huge RGB Matrix Panel display

[tsctrl]

Hi @mrfaptastic ,

sorry again to ask alot.

i would like to suggest capability to allocate ram usage to use ps ram on wrover module. seems like adding this is not a big change.

adding flags or variable to switch malloc to ps_malloc should suffice to have the capability and allow more option to run higher bit graphic on the wrover module.

thank you!

[mrcodetastic]

ESP32 doesn't support DMA from PSRAM

[mrcodetastic]

#55

[sheepov]

Hi,

Any issue using this ESP32-HUB75-MatrixPanel-I2S-DMA & PSRAM (wrover) ?
Do you have test the CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL ("Reserve this amount of bytes for data that specifically needs to be in DMA or internal memory") option ?
=> https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/kconfig.html#config-spiram-malloc-reserve-internal

I need more ram for my project..
thx for your work!

[mrcodetastic]

I don't understand what your question is.

[sheepov]

is it possible to use this lib & PSRAM?

see README.md, memory constraints => it is not possible
but using "CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL" may solve the problem?

test using this lib with PSRAM enable on wrover :
My program crash when i use this instruction :
if( not dma_display->begin(//mini esp prod
12, //r1,
14, //g1,
27, //b1,
22, //r2,
23, //g2,
2, //b2
15, //a
21, //b,
16, //c,
17, //d,
34, //e,
18, //lat,
19, //oe,
5 //clk
))
Serial.println("****** !KABOOM! Insufficient memory - allocation failed ***********");

=> no error msg but sometimes a weird character is printed : 13:40:00.630 -> l�⸮��

[sheepov]

Hi, I understand : this is not possible to use this lib from internal RAM and enable PSRAM. Le jeu. 15 avr. 2021 à 18:54, mrfaptastic ***@***.***> a écrit :

…

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[mrcodetastic]

PSRAM support is now available on ESP32-S3 only, but output throughput ('clock rate') is limited to 10Mhz due to hardware limitations.

20Mhz is available if you continue to use the limited SRAM - but then you face the same old problem of not being able to have a huge resolution..

In summary: There's not much benefit in using PSRAM as the low througput negates the value of having extra memory/possible chains of panels = flicker.

#343