ESP32 Forum

Hi,

I'm migrating a project from esp32 to esp32-s3.

In the esp32 i wrote a i2s lcd driver with the help of @ESP_houwenxiang because some hardware "bugs" and bad documentation.

From what i have read and researched the new i2s module of esp32-s3 is quite different from the i2s module of esp32.

I did not find a decent documentation for the lcd module or the i2s module of the esp32-s3 chip.

I need a full documentation of theses modules, to implement my lcd driver.

@ESP_houwenxiang or @rudi or someone would help me ?

Thank's.

Fyi, wrt the LCD HW, we have a TRM chapter for that, but unfortunately it's not out yet... you can look at the ESP-LCD component in ESP-IDF wrt how to use it, and if you have any more specific questions, feel free to ask them here.

Probably one of the doubts will be in relation to the dma of the HW LCD.

Does lcd hw use gdma or have dedicated dma ?

How to set dma in lcd hw to use static ram ?
How to set dma in lcd hw to use spi ram ?

Thank's @ESP_Sprite.

It can use GDMA or EDMA, indeed, so you can access stuff on SPI RAM as well. I can't entirely describe the process to init it, but you can look at ESP-IDF to see working source code for the process.

Hi @ESP_Sprite,

Does the esp32-s3 lcd module have any relationship with the i2s module ?
Or are these modules completely separate ?

How do i know this file specifically refers to the HW_LCD of the esp32-s3 chip ?
https://github.com/espressif/esp-idf/bl ... l_io_i80.c

That way espressif make my life too complicated

Could you send me the manual for the esp32-s3 lcd module by email ?
Do i need to sign a contract for this ?

Thank's.

In the S3, the modules are entirely separate. I don't think I really can send the docs yet, they're still a work in progress, sorry. I agree that the code is complicated if you want to know how to poke the hardware; that's the price for drivers that are more universal and common on the range...

@ESP_Sprite,

I really need you to confirm for sure which esp-idf file(s) use the esp32-s3 HW-LCD module ?

This file ?
https://github.com/espressif/esp-idf/bl ... l_io_i80.c

Other files ?

Thank's.

The lcd_ll_* and lcd_hal_* are calls into the abstraction layer for the LCD peripheral; you can assume that any code that calls those uses the LCD peripheral.

@ESP_Sprite,

if i'm not wrong, i will have to understand the peripherals gdma/edma, and these peripherals don't have documentation too.

I am in a fix

Well, you could use the ll/hal drivers up to a point... What specifically are you trying to pull off using these peripherals anyway?