Library for ILI9341 BPI-R64

warg · March 9, 2022, 5:17pm

Greetings,

Is there a library for ILI9341 in BPI R64 with Openwrt? I’m traing to figure out how to control LCD ILI9341 but I couldn’t, can anyone help me?

frank-w · March 9, 2022, 5:36pm

Seems that mainline linux supports it…

github.com

torvalds/linux/blob/master/drivers/gpu/drm/tiny/ili9341.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * DRM driver for Ilitek ILI9341 panels
 *
 * Copyright 2018 David Lechner <[email protected]>
 *
 * Based on mi0283qt.c:
 * Copyright 2016 Noralf Trønnes
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/spi/spi.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>

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You have to enable CONFIG_TINYDRM_ILI9341 with depencies and your your bus (spi)

warg · March 9, 2022, 6:27pm

Greetings, Thanks Frank for yout reply, I’m really newbie, is there a tutorial to use it? , I just find out CONFIG_TINYDRM_ILI9341 is in make kernel_menuconfig and I know how to enable spidev0.0 I’m tested it with a loopback with spidev_test, but I’m locked in this point, I’m really confused because I didn’t find out information how to use it. Could you guide me ?

frank-w · March 9, 2022, 7:27pm

Imho you need a dts node below the spi-node you want to use with the compatible and properties for this specific driver

So first you need to find the right spi-node in bananapi r64 dts

https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts#L560

and put something like this into it:

https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/display/ilitek,ili9341.txt

And of course add the driver above