KeDei 3.5 inch 480x320 TFT lcd from ali

[FREE WING]

Final post on the KeDei v5.0 code.

Below are images of the reverse of the board to show connections and version; and an image of it loading a bmp from SPIFFS.

Hi .

I use KeDei V5.0 LCD module .
So I transplanted the Conjur's program for raspberry pi .
I appreciate very good program and analysis content .

I registered the program in GitHub .
https://github.com/FREEWING-JP/Raspberr ... 35_lcd_v50

Thank you .

[notro]

fbtft never was a good fit for these keidei displays, but it's successor tinydrm has a much better modularity.
I don't have a keidei displays myself, and I certainly don't want one, but the hacker/maker spirit shown in this thread has spurred me to make it very easy to write a keidei driver that can support multiple versions of the display.

I have looked at some code on @saper_2's github repo and put together a keidei skeleton driver. It probably won't work as-is, but I'm quite certain that some people in this thread should be able to make it work.

Step-by-step and some more:

Code: Select all

# install tinydrm kernel with headers
$ sudo REPO_URI=https://github.com/notro/rpi-firmware BRANCH=tinydrm rpi-update
$ sudo reboot
$ uname -a
Linux raspberrypi 4.10.4-v7+ #1 SMP Wed Mar 22 13:05:23 CET 2017 armv7l GNU/Linux

# if you want me to pull your changes, fork this repo and use your fork instead
$ git clone https://github.com/notro/tinydrm
$ cd tinydrm/
$ make
$ sudo make install && sudo depmod

$ sudo dtc -@ -I dts -O dtb -o /boot/overlays/keidei20.dtbo rpi-overlays/keidei20-overlay.dts
Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@0/__overlay__/spidev@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@0/__overlay__/spidev@1 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property

$ sudo nano /boot/cmdline.txt
drm.debug=0xf

$ sudo nano /boot/config.txt
dtoverlay=keidei20

$ sudo reboot

$ sudo vcdbg log msg 2>&1 | grep keidei
002167.799: Loaded overlay 'keidei20'

$ cat /proc/device-tree/soc/spi@7e204000/keidei@0/compatible && echo
keidei,keidei_v20

$ cat /sys/bus/spi/devices/spi0.0/modalias
spi:keidei_v20

$ modinfo keidei
filename:       /lib/modules/4.10.4-v7+/extra/keidei.ko
license:        GPL
author:         SOME GUY
description:    keidei DRM driver
alias:          spi:keidei_v20
alias:          spi:keidei_v10
srcversion:     D986815279C88770FB60498
alias:          of:N*T*Ckeidei,keidei_v20C*
alias:          of:N*T*Ckeidei,keidei_v20
alias:          of:N*T*Ckeidei,keidei_v10C*
alias:          of:N*T*Ckeidei,keidei_v10
depends:        tinydrm,drm,mipi-dbi
vermagic:       4.10.4-v7+ SMP mod_unload modversions ARMv7 p2v8

# picked only the relevant modules
$ lsmod
Module                  Size  Used by
keidei                  5752  0
mipi_dbi               10985  1 keidei
tinydrm                13920  2 keidei,mipi_dbi
drm_kms_helper        153025  2 tinydrm,mipi_dbi
drm                   347095  5 keidei,tinydrm,mipi_dbi,drm_kms_helper

# only relevant parts
$ dmesg
[    5.632171] [drm] Initialized
[    5.799206] keidei: loading out-of-tree module taints kernel.
[    5.803341] [drm:mipi_dbi_init [mipi_dbi]] preferred_depth=16, rotation = 0
[    5.803362] [drm:keidei_probe [keidei]]
[    6.056029] [drm:keidei20_command [keidei]] cmd=11
[    6.056051] [drm:keidei20_write [keidei]] 0011:11 / 0011:1b
[    6.196052] [drm:keidei20_command [keidei]] cmd=ee, par=02 01 02 01
[    6.196074] [drm:keidei20_write [keidei]] 00ee:11 / 00ee:1b
[    6.196140] [drm:keidei20_write [keidei]] 0002:15 / 0002:1f
[    6.196170] [drm:keidei20_write [keidei]] 0001:15 / 0001:1f
[    6.196198] [drm:keidei20_write [keidei]] 0002:15 / 0002:1f
[    6.196227] [drm:keidei20_write [keidei]] 0001:15 / 0001:1f
[    6.196256] [drm:keidei20_command [keidei]] cmd=ed, par=00 00 9a 9a 9b 9b 00 00 00 00 ae ae 01 a2 00
[    6.196271] [drm:keidei20_write [keidei]] 00ed:11 / 00ed:1b
[    6.196299] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196337] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196367] [drm:keidei20_write [keidei]] 009a:15 / 009a:1f
[    6.196397] [drm:keidei20_write [keidei]] 009a:15 / 009a:1f
[    6.196427] [drm:keidei20_write [keidei]] 009b:15 / 009b:1f
[    6.196455] [drm:keidei20_write [keidei]] 009b:15 / 009b:1f
[    6.196484] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196533] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196564] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196595] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196626] [drm:keidei20_write [keidei]] 00ae:15 / 00ae:1f
[    6.196656] [drm:keidei20_write [keidei]] 00ae:15 / 00ae:1f
[    6.196687] [drm:keidei20_write [keidei]] 0001:15 / 0001:1f
[    6.196717] [drm:keidei20_write [keidei]] 00a2:15 / 00a2:1f
[    6.196747] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196777] [drm:keidei20_command [keidei]] cmd=b4, par=00
[    6.196793] [drm:keidei20_write [keidei]] 00b4:11 / 00b4:1b
[    6.196822] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196853] [drm:keidei20_command [keidei]] cmd=c0, par=10 3b 00 02 11
[    6.196869] [drm:keidei20_write [keidei]] 00c0:11 / 00c0:1b
[    6.196902] [drm:keidei20_write [keidei]] 0010:15 / 0010:1f
[    6.196935] [drm:keidei20_write [keidei]] 003b:15 / 003b:1f
[    6.196966] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.196998] [drm:keidei20_write [keidei]] 0002:15 / 0002:1f
[    6.197032] [drm:keidei20_write [keidei]] 0011:15 / 0011:1f
[    6.197067] [drm:keidei20_command [keidei]] cmd=c1, par=10
[    6.197083] [drm:keidei20_write [keidei]] 00c1:11 / 00c1:1b
[    6.197117] [drm:keidei20_write [keidei]] 0010:15 / 0010:1f
[    6.197150] [drm:keidei20_command [keidei]] cmd=c8, par=00 46 12 20 0c 00 56 12 67 02 00 0c
[    6.197166] [drm:keidei20_write [keidei]] 00c8:11 / 00c8:1b
[    6.197199] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.197230] [drm:keidei20_write [keidei]] 0046:15 / 0046:1f
[    6.197258] [drm:keidei20_write [keidei]] 0012:15 / 0012:1f
[    6.197288] [drm:keidei20_write [keidei]] 0020:15 / 0020:1f
[    6.197319] [drm:keidei20_write [keidei]] 000c:15 / 000c:1f
[    6.197349] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.197380] [drm:keidei20_write [keidei]] 0056:15 / 0056:1f
[    6.197410] [drm:keidei20_write [keidei]] 0012:15 / 0012:1f
[    6.197440] [drm:keidei20_write [keidei]] 0067:15 / 0067:1f
[    6.197470] [drm:keidei20_write [keidei]] 0002:15 / 0002:1f
[    6.197501] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.197531] [drm:keidei20_write [keidei]] 000c:15 / 000c:1f
[    6.197561] [drm:keidei20_command [keidei]] cmd=d0, par=44 42 06
[    6.197576] [drm:keidei20_write [keidei]] 00d0:11 / 00d0:1b
[    6.197605] [drm:keidei20_write [keidei]] 0044:15 / 0044:1f
[    6.197633] [drm:keidei20_write [keidei]] 0042:15 / 0042:1f
[    6.197661] [drm:keidei20_write [keidei]] 0006:15 / 0006:1f
[    6.197689] [drm:keidei20_command [keidei]] cmd=d1, par=43 16
[    6.197704] [drm:keidei20_write [keidei]] 00d1:11 / 00d1:1b
[    6.197737] [drm:keidei20_write [keidei]] 0043:15 / 0043:1f
[    6.197768] [drm:keidei20_write [keidei]] 0016:15 / 0016:1f
[    6.197798] [drm:keidei20_command [keidei]] cmd=d2, par=04 22
[    6.197814] [drm:keidei20_write [keidei]] 00d2:11 / 00d2:1b
[    6.197844] [drm:keidei20_write [keidei]] 0004:15 / 0004:1f
[    6.197875] [drm:keidei20_write [keidei]] 0022:15 / 0022:1f
[    6.197904] [drm:keidei20_command [keidei]] cmd=d3, par=04 12
[    6.197920] [drm:keidei20_write [keidei]] 00d3:11 / 00d3:1b
[    6.197950] [drm:keidei20_write [keidei]] 0004:15 / 0004:1f
[    6.197981] [drm:keidei20_write [keidei]] 0012:15 / 0012:1f
[    6.198010] [drm:keidei20_command [keidei]] cmd=d4, par=07 12
[    6.198025] [drm:keidei20_write [keidei]] 00d4:11 / 00d4:1b
[    6.198056] [drm:keidei20_write [keidei]] 0007:15 / 0007:1f
[    6.198086] [drm:keidei20_write [keidei]] 0012:15 / 0012:1f
[    6.198116] [drm:keidei20_command [keidei]] cmd=e9, par=00
[    6.198132] [drm:keidei20_write [keidei]] 00e9:11 / 00e9:1b
[    6.198162] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.198191] [drm:keidei20_command [keidei]] cmd=c5, par=08
[    6.198207] [drm:keidei20_write [keidei]] 00c5:11 / 00c5:1b
[    6.198237] [drm:keidei20_write [keidei]] 0008:15 / 0008:1f
[    6.198266] [drm:keidei20_command [keidei]] cmd=36, par=6a
[    6.198282] [drm:keidei20_write [keidei]] 0036:11 / 0036:1b
[    6.198312] [drm:keidei20_write [keidei]] 006a:15 / 006a:1f
[    6.198342] [drm:keidei20_command [keidei]] cmd=3a, par=55
[    6.198357] [drm:keidei20_write [keidei]] 003a:11 / 003a:1b
[    6.198388] [drm:keidei20_write [keidei]] 0055:15 / 0055:1f
[    6.198418] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 3f
[    6.198433] [drm:keidei20_write [keidei]] 002a:11 / 002a:1b
[    6.198464] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.198494] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.198524] [drm:keidei20_write [keidei]] 0001:15 / 0001:1f
[    6.198555] [drm:keidei20_write [keidei]] 003f:15 / 003f:1f
[    6.198584] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 e0
[    6.198600] [drm:keidei20_write [keidei]] 002b:11 / 002b:1b
[    6.198630] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.198660] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.198691] [drm:keidei20_write [keidei]] 0001:15 / 0001:1f
[    6.198721] [drm:keidei20_write [keidei]] 00e0:15 / 00e0:1f
[    6.336043] [drm:keidei20_command [keidei]] cmd=21
[    6.336067] [drm:keidei20_write [keidei]] 0021:11 / 0021:1b
[    6.336130] [drm:keidei20_command [keidei]] cmd=35, par=00
[    6.336146] [drm:keidei20_write [keidei]] 0035:11 / 0035:1b
[    6.336181] [drm:keidei20_write [keidei]] 0000:15 / 0000:1f
[    6.336489] [drm:drm_minor_register [drm]]
[    6.336760] [drm:drm_minor_register [drm]]
[    6.337002] [drm:drm_minor_register [drm]]
[    6.337652] [drm:drm_minor_register [drm]] new minor registered 0
[    6.338265] [drm:drm_sysfs_connector_add [drm]] adding "Virtual-1" to sysfs
[    6.338511] [drm:drm_sysfs_hotplug_event [drm]] generating hotplug event
[    6.338865] [drm:drm_mode_object_reference [drm]] OBJ ID: 25 (1)
[    6.339023] [drm:drm_setup_crtcs [drm_kms_helper]]
[    6.339141] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:25:Virtual-1]
[    6.339273] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:25:Virtual-1] probed modes :
[    6.339541] [drm:drm_mode_debug_printmodeline [drm]] Modeline 29:"480x320" 0 1 480 480 480 480 320 320 320 320 0x48 0x0
[    6.339691] [drm:drm_setup_crtcs [drm_kms_helper]] connector 25 enabled? yes
[    6.339807] [drm:drm_setup_crtcs [drm_kms_helper]] looking for cmdline mode on connector 25
[    6.339920] [drm:drm_setup_crtcs [drm_kms_helper]] looking for preferred mode on connector 25 0
[    6.340040] [drm:drm_setup_crtcs [drm_kms_helper]] found mode 480x320
[    6.340154] [drm:drm_setup_crtcs [drm_kms_helper]] picking CRTCs for 480x320 config
[    6.340345] [drm:drm_setup_crtcs [drm_kms_helper]] desired mode 480x320 set on crtc 27 (0,0)
[    6.340640] [drm:drm_mode_object_reference [drm]] OBJ ID: 25 (2)
[    6.340775] [drm:drm_fbdev_cma_create [drm_kms_helper]] surface width(480), height(320) and bpp(16)
[    6.357070] keidei spi0.0: fb1:  frame buffer device
[    6.416085] [drm:keidei_probe [keidei]] Initialized keidei:spi0.0 @32MHz on minor 0

# clear log
$ sudo dmesg -C

# one second of console output will flood the log with the detailed logging in keidei20_write()
# so remove it when it looks ok
$ con2fbmap 1 1 && sleep 1 && con2fbmap 1 0
$ dmesg | wc -l
2046

# no need to reboot or reinstall modules to test a driver change if the depending modules are loaded
# but 'make install' is necessary to load the correct version on boot
$ cd tinydrm/
$ make
$ sudo rmmod keidei
$ sudo insmod keidei.ko

Links:
https://github.com/notro/tinydrm/wiki/b ... spberry-Pi
https://github.com/notro/tinydrm/blob/master/keidei.c
https://github.com/notro/tinydrm/blob/master/README.md


I see some mention of i2c here, does some versions of the display use i2c?

[saper_2]

Hi notro

fbtft never was a good fit for these keidei displays, but it's successor tinydrm has a much better modularity.

Oh, I've never heard about it, need to check it

I don't have a keidei displays myself, and I certainly don't want one, but the hacker/maker spirit shown in this thread has spurred me to make it very easy to write a keidei driver that can support multiple versions of the display.

Hahaha, u're right - you certainly don't want the spi one
Anyway, I don't see them so much now, there is much more small tft displays with spi interface with proper(compatible) fbtft spi interface (spi to parallel )

AS far as I remember, kedei don't change the I/F (3 or 4 in chain SIPO registers) , but for better pcb routing they changed in each version signals locations at shift registers outputs, or they doing a strange things to the display signals

I have looked at some code on @saper_2's github repo and put together a keidei skeleton driver. It probably won't work as-is, but I'm quite certain that some people in this thread should be able to make it work.

My code works only for v1 or v2 , for later versions - they made too many changes in hardware , and there is no inits.

For V5 Conjur did great job of: recording init sequence, and writing code for displaying images

I see some mention of i2c here, does some versions of the display use i2c?

No, just some people have problems with i2c interface on sys-images from kedei.

[doublehp]

No, just some people have problems with i2c interface on sys-images from kedei.

In some versions of their ROM, they had removed many critical I2C tools; then, put them back.

They are disabling completely all I2C features on official I2C pins. I have found several workarounds:
viewtopic.php?f=44&t=173272

In short, you can either:
- use a bitbanging daemon like http://abyz.co.uk/rpi/pigpio/pigs.html
or
- use the boot argument /boot/config.txt : dtoverlay=i2c-gpio,i2c_gpio_sda=30,i2c_gpio_scl=31,i2c_gpio_delay_us=5

[FREE WING]

fbtft never was a good fit for these keidei displays, but it's successor tinydrm has a much better modularity.
I don't have a keidei displays myself, and I certainly don't want one, but the hacker/maker spirit shown in this thread has spurred me to make it very easy to write a keidei driver that can support multiple versions of the display.

I have looked at some code on @saper_2's github repo and put together a keidei skeleton driver. It probably won't work as-is, but I'm quite certain that some people in this thread should be able to make it work.

Step-by-step and some more:

Hi notro .

Very Thank you . You provide tinydrm .
Tentatively, I modified it for KeDei V5.0 module .
The model name is still old (it keidei20, not keidei50) . It is incomplete to release (for Pull request) .
But I confirmed that it works with V 5.0 !

I forked and make branch feature/kedei_35_v50 .
https://github.com/FREEWING-JP/tinydrm/ ... dei_35_v50
https://github.com/FREEWING-JP/tinydrm/ ... 35_lcd_v50

Thank you .

[notro]

That's cool FREE WING, it didn't take you long to make it work!

It would have been interesting to know the speed of these displays, how many frames per second they can do: https://github.com/notro/tinydrm/wiki/D ... t#modetest

[FREE WING]

That's cool FREE WING, it didn't take you long to make it work!

It would have been interesting to know the speed of these displays, how many frames per second they can do: https://github.com/notro/tinydrm/wiki/D ... t#modetest

Hi notro . Thank you !

I tested .
Result: freq: 0.50Hz
* Oh ! KeDei is very slow .
(drm.debug parameter is none .)

Code: Select all

$ ./tests/modetest/modetest -M "keidei_v20" -c
failed to open device 'keidei_v20': No such file or directory

$ ./tests/modetest/modetest -M "keidei" -c
Connectors:
id      encoder status          name            size (mm)       modes   encoders
25      28      connected       Virtual-1       0x0             1       28
  modes:
        name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  480x320 0 480 480 480 480 320 320 320 320 1 flags: ; type: preferred, driver
  props:
        2 DPMS:
                flags: enum
                enums: On=0 Standby=1 Suspend=2 Off=3
                value: 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16 -v
setting mode 480x320-0Hz@RG16 on connectors 25, crtc 27
freq: 0.50Hz

When drm.debug=0xf
SPI freq. is 32MHz .
Buffer transfer is Full size .
Hmm... What is bottleneck ? -> It may be linux/spi/spidev.h overhead .

Code: Select all

[   87.891552] keidei spi0.1: fb1:  frame buffer device
[   87.934529] [drm:keidei_probe [keidei]] Initialized keidei:spi0.1 @32MHz on minor 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16
[  282.506163] [drm:keidei_enable [keidei]]
[  282.508313] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 df
[  282.508328] [drm:keidei20_write8 [keidei]] 2a /  15:11 / 15:1b
[  282.508410] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508518] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508559] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  282.508601] [drm:keidei20_write8 [keidei]] df /  6f:35 / 6f:3f
[  282.508640] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 3f
[  282.508654] [drm:keidei20_write8 [keidei]] 2b /  15:31 / 15:3b
[  282.508693] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508732] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  282.508771] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  282.508810] [drm:keidei20_write8 [keidei]] 3f /  1f:35 / 1f:3f
[  282.508850] [drm:keidei20_command [keidei]] cmd=2c, len=307200
[  282.508863] [drm:keidei20_write8 [keidei]] 2c /  16:11 / 16:1b
[  284.480753] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 df
[  284.480760] [drm:keidei20_write8 [keidei]] 2a /  15:11 / 15:1b
[  284.480803] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  284.480823] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  284.480879] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  284.480899] [drm:keidei20_write8 [keidei]] df /  6f:35 / 6f:3f
[  284.480918] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 3f
[  284.480925] [drm:keidei20_write8 [keidei]] 2b /  15:31 / 15:3b
[  284.480944] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  284.480963] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  284.480981] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  284.481001] [drm:keidei20_write8 [keidei]] 3f /  1f:35 / 1f:3f
[  284.481019] [drm:keidei20_command [keidei]] cmd=2c, len=307200
[  284.481026] [drm:keidei20_write8 [keidei]] 2c /  16:11 / 16:1b
[  286.395632] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 df
[  286.395642] [drm:keidei20_write8 [keidei]] 2a /  15:11 / 15:1b
[  286.395685] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  286.395710] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  286.395745] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  286.395765] [drm:keidei20_write8 [keidei]] df /  6f:35 / 6f:3f
[  286.395784] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 3f
[  286.395791] [drm:keidei20_write8 [keidei]] 2b /  15:31 / 15:3b
[  286.395811] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  286.395833] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  286.395855] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  286.395875] [drm:keidei20_write8 [keidei]] 3f /  1f:35 / 1f:3f
[  286.395894] [drm:keidei20_command [keidei]] cmd=2c, len=307200
[  286.395901] [drm:keidei20_write8 [keidei]] 2c /  16:11 / 16:1b
[  288.304499] [drm:keidei_disable [keidei]]
[  288.308391] [drm:keidei20_command [keidei]] cmd=2a, par=00 00 01 df
[  288.308401] [drm:keidei20_write8 [keidei]] 2a /  15:11 / 15:1b
[  288.308448] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  288.308509] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  288.308530] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  288.308552] [drm:keidei20_write8 [keidei]] df /  6f:35 / 6f:3f
[  288.308571] [drm:keidei20_command [keidei]] cmd=2b, par=00 00 01 3f
[  288.308578] [drm:keidei20_write8 [keidei]] 2b /  15:31 / 15:3b
[  288.308598] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  288.308619] [drm:keidei20_write8 [keidei]] 00 /  00:15 / 00:1f
[  288.308641] [drm:keidei20_write8 [keidei]] 01 /  00:35 / 00:3f
[  288.308660] [drm:keidei20_write8 [keidei]] 3f /  1f:35 / 1f:3f
[  288.308679] [drm:keidei20_command [keidei]] cmd=2c, len=307200
[  288.308686] [drm:keidei20_write8 [keidei]] 2c /  16:11 / 16:1b

sudo nano /boot/config.txt
dtoverlay=keidei20:speed=16000000
SPI freq. is 16MHz .

Code: Select all

[    5.062074] keidei spi0.1: fb1:  frame buffer device
[    5.123948] [drm:keidei_probe [keidei]] Initialized keidei:spi0.1 @16MHz on minor 0

$ ./tests/modetest/modetest -M "keidei" -s 25:480x320@RG16 -v
setting mode 480x320-0Hz@RG16 on connectors 25, crtc 27
freq: 0.45Hz
freq: 0.45Hz

[notro]

That was indeed very slow.

The only way to speed this up is to send multiple pixels in one spi_write(), but looking at your code, each value is sent with 2 spi_write's, not one as I had suggested.
So if you have to do that to make it work, then we're stuck.
You could try to lower the speed and see if the shift registers would tolerate one value sent as one buffer.
The actual spi transfer speed doesn't matter much when (320 * 240 * 2 * 2) transfers is used to send the framebuffer.

[wbmk]

Hi FREE WING,

Is it possible to modify this for version 6.1.3 of the Kedei LCD? And could you do this? my programming skills are not that great..

Regards, wbmk

[FREE WING]

Hi FREE WING,

Is it possible to modify this for version 6.1.3 of the Kedei LCD? And could you do this? my programming skills are not that great..

Regards, wbmk

I don't have V 6.1.3 of the KeDei . So I don't know how control that .
If same as V 5.0 . You can use this . Try it !
https://github.com/FREEWING-JP/tinydrm/ ... dei_35_v50

How to install
https://github.com/FREEWING-JP/tinydrm/ ... cd_v50.txt

[wbmk]

Hi FREE_WING,

I have tried.. it seems to compile, but it does not display any image..

Maybe i don't understand your install instructions.. do i need to execute everything, or are some lines the expected reply when executed?

Thank, wbmk

[wbmk]

Hi FREE WING,

The installation goes fine until this point..:

sudo dtc -@ -I dts -O dtb -o /boot/overlays/keidei50.dtbo rpi-overlays/keidei50-overlay.dts
Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@0/__overlay__/spidev@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@0/__overlay__/spidev@1 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property

What do i have to do next to solve this? I don't understand the instructions on how to edit cmdline.txt en config.txt files..?

Can you help me? Thanx!

[wbmk]

Some more info from the command-line..

pi@RpiTeleCine:~ $ sudo fbi -d /dev/fb1 -T 1 -a cat.jpg
using "Droid Sans Mono-16", pixelsize=21,33 file=/usr/share/fonts/truetype/droid/DroidSansMono.ttf
pi@RpiTeleCine:~ $ sudo vcdbg log msg 2>&1 | grep keidei
pi@RpiTeleCine:~ $ cat /proc/device-tree/soc/spi@7e204000/keidei@0/compatible && echo
cat: /proc/device-tree/soc/spi@7e204000/keidei@0/compatible: Bestand of map bestaat niet
pi@RpiTeleCine:~ $ cat /sys/bus/spi/devices/spi0.0/modalias
cat: /sys/bus/spi/devices/spi0.0/modalias: Bestand of map bestaat niet
pi@RpiTeleCine:~ $ modinfo keidei
filename: /lib/modules/4.10.4-v7+/extra/keidei.ko
license: GPL
author: SOME GUY
description: keidei DRM driver
alias: spi:keidei_v50
alias: spi:keidei_v20
alias: spi:keidei_v10
srcversion: B5A97F289EE4FD67AC8D6C2
alias: of:N*T*Ckeidei,keidei_v50C*
alias: of:N*T*Ckeidei,keidei_v50
alias: of:N*T*Ckeidei,keidei_v20C*
alias: of:N*T*Ckeidei,keidei_v20
alias: of:N*T*Ckeidei,keidei_v10C*
alias: of:N*T*Ckeidei,keidei_v10
depends: tinydrm,drm,mipi-dbi
vermagic: 4.10.4-v7+ SMP mod_unload modversions ARMv7 p2v8
pi@RpiTeleCine:~ $ lsmod | grep keidei
pi@RpiTeleCine:~ $ dmesg | grep keidei
pi@RpiTeleCine:~ $ sudo dmesg -C
pi@RpiTeleCine:~ $ con2fbmap 1 1 && sleep 1 && con2fbmap 1 0
ioctl FBIOPUT_CON2FBMAP: Invalid argument
pi@RpiTeleCine:~ $ dmesg | wc -l
0
pi@RpiTeleCine:~ $

[notro]

pi@RpiTeleCine:~ $ sudo vcdbg log msg 2>&1 | grep keidei

Have you added this to /boot/config.txt:

Code: Select all

dtoverlay=keidei50

This tells the bootloader to load the Device Tree overlay which will add the device.

Some background:
* 'keidei' is a loadable kernel module.
* The 'keidei' module registers a SPI driver
* The DT overlay adds a SPI device that will be bound to the driver, resulting in the probe function being called

pi@RpiTeleCine:~ $ cat /sys/bus/spi/devices/spi0.0/modalias
cat: /sys/bus/spi/devices/spi0.0/modalias: Bestand of map bestaat niet

The DT overlay uses reg=1, so the device will be called spi0.1

[wbmk]

hi notro,

thank you for your reply..

i made a typ0 when editing the config.txt

now, i get a litte further..

this is the responce so far..

pi@RpiTeleCine:~ $ sudo fbi -d /dev/fb1 -T 1 -a cat.jpg
using "Droid Sans Mono-16", pixelsize=21,33 file=/usr/share/fonts/truetype/droid/DroidSansMono.ttf
pi@RpiTeleCine:~ $ sudo vcdbg log msg 2>&1 | grep keidei
002104.515: Loaded overlay 'keidei50'
pi@RpiTeleCine:~ $ cat /proc/device-tree/soc/spi@7e204000/keidei@0/compatible && echo
keidei,keidei_v50
pi@RpiTeleCine:~ $ cat /sys/bus/spi/devices/spi0.0/modalias
cat: /sys/bus/spi/devices/spi0.0/modalias: Bestand of map bestaat niet
pi@RpiTeleCine:~ $ cat /sys/bus/spi/devices/spi0.1/modalias
spi:keidei_v50
pi@RpiTeleCine:~ $ modinfo keidei
filename: /lib/modules/4.10.4-v7+/extra/keidei.ko
license: GPL
author: SOME GUY
description: keidei DRM driver
alias: spi:keidei_v50
alias: spi:keidei_v20
alias: spi:keidei_v10
srcversion: B5A97F289EE4FD67AC8D6C2
alias: of:N*T*Ckeidei,keidei_v50C*
alias: of:N*T*Ckeidei,keidei_v50
alias: of:N*T*Ckeidei,keidei_v20C*
alias: of:N*T*Ckeidei,keidei_v20
alias: of:N*T*Ckeidei,keidei_v10C*
alias: of:N*T*Ckeidei,keidei_v10
depends: tinydrm,drm,mipi-dbi
vermagic: 4.10.4-v7+ SMP mod_unload modversions ARMv7 p2v8
pi@RpiTeleCine:~ $ lsmod | grep keidei
keidei 8618 0
mipi_dbi 10985 1 keidei
tinydrm 13920 2 keidei,mipi_dbi
drm 347095 5 keidei,tinydrm,mipi_dbi,drm_kms_helper
pi@RpiTeleCine:~ $ dmesg | grep keidei
[ 3.677339] keidei: loading out-of-tree module taints kernel.
[ 4.607536] keidei spi0.1: fb1: frame buffer device
pi@RpiTeleCine:~ $ sudo dmesg -C
pi@RpiTeleCine:~ $ con2fbmap 1 1 && sleep 1 && con2fbmap 1 0
pi@RpiTeleCine:~ $ dmesg | wc -l
0
pi@RpiTeleCine:~ $

so, output of the last command is 0.. this does not seem correct... am i doing something wrong??

thanx again sofar..

regards, wbmk

[FREE WING]

Hi FREE_WING,

I have tried.. it seems to compile, but it does not display any image..

Maybe i don't understand your install instructions.. do i need to execute everything, or are some lines the expected reply when executed?

Thank, wbmk

You try this first .
https://github.com/FREEWING-JP/Raspberr ... 35_lcd_v50

If this program work fine and display proper your KeDei V 6.1.3 . You can use tinydrm driver .
If not work . You can't use tinydrm driver this time . Because KeDei V6.13 is different from KeDei V5.0 .

[wbmk]

Hi,

I run the program (first one), and it seems to run fine..

Got this response:
sudo ./kedei_lcd_v50_pi


File Size: 245814
Offset: 54
Width: 319
Height: 256
BPP: 24



File Size: 245814
Offset: 54
Width: 319
Height: 256
BPP: 24



File Size: 245814
Offset: 54
Width: 319
Height: 256
BPP: 24

But there is no image displayed... it's just lit up white....?

[saper_2]

But there is no image displayed... it's just lit up white....?

The answer already has been given:

If this program work fine and display proper your KeDei V 6.1.3 . You can use tinydrm driver .
If not work . You can't use tinydrm driver this time .

So: tinydrm works but your display stay white = your display IS NOT compatible with tinydrm for KeDei SPI display v5.0 and period.

KeDei always incr display revision when change display (hardware wiring/init seq./controller/etc....) - so basically: driver version must match exactly display version and period

[wbmk]

ok, to bad... thanx for the reply though

[saitoh00]

Hello, i have the KeDei 3.5 inch 480x320 TFTLCD VERSION 6.2 2016/6/1, really are too slow, but i see videos of games running in this screen, how i can fix the poor fps in this screen?

[bitbank]

Hello, i have the KeDei 3.5 inch 480x320 TFTLCD VERSION 6.2 2016/6/1, really are too slow, but i see videos of games running in this screen, how i can fix the poor fps in this screen?

Can you provide a link to the videos you're referring to? If it's my video, the game runs well because my game emulator code talks directly to the display and only transmits the changes. Using other game emulators + fbtft/fbcp will always perform poorly because of their generalized solution to copying the entire frame buffer each frame.

Bottom line - that display has too many pixels and too slow an interface to have a fast refresh rate.

[saitoh00]

Hello, i have the KeDei 3.5 inch 480x320 TFTLCD VERSION 6.2 2016/6/1, really are too slow, but i see videos of games running in this screen, how i can fix the poor fps in this screen?

Can you provide a link to the videos you're referring to? If it's my video, the game runs well because my game emulator code talks directly to the display and only transmits the changes. Using other game emulators + fbtft/fbcp will always perform poorly because of their generalized solution to copying the entire frame buffer each frame.

Bottom line - that display has too many pixels and too slow an interface to have a fast refresh rate.

i cant found the videos that i see the other day, what emulator are u saying?

[bitbank]

i cant found the videos that i see the other day, what emulator are u saying?

My main job for 10+ years was writing game emulators for various systems. I wrote mostly coin-op emulators, but as a 'hobby', I also wrote console/handheld game emulators. I'm working on releasing an open-source version of some of this code. It's highly optimized, compact and much easier to modify than the other open-source emulators people use. I've recently added code to send the frames in a more optimal way to SPI-connected LCD displays so that they can get a higher frame rate with a slow interface. This code is not available to the public yet, but you can beta test it if you ask nicely. Here are some videos of it in action:

https://www.youtube.com/channel/UCK8_id ... lYiABg4TBA

[saitoh00]

yeah the videos are yours... i search the youtube visited videos and i see your channel, a master of the emulation.

[iiAlphaWolf]

Hey everything is intresting and stuff, i cant help you but you can help me lol. How the heck did you make the screen even work? I put it on my pi i see backlight but no screen i do all codes they tell me still black screen... wth