[参考译文] DLPDLCR2000EVM：Raspberry Pi 3B+启动界面闪烁、但没有桌面显示

https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/1162947/dlpdlcr2000evm-raspberry-pi-3b-splash-screen-flickers-but-no-desktop-display

我尝试将 Raspberry Pi 3B+与 DLPDCLR2000EVM 集成在一起、以在运行时显示静态图像、但无法让投影仪显示 Raspberry Pi OS 的桌面。 在引导过程中，当我执行会更改显示的终端命令时，默认启动屏幕将闪烁，如vlc file.mov。

我使用本教程将组件连接在一起：

https://community.element14.com/products/roadtest/rv/roadtest_reviews/292/dlp_pico_display_pro_3#jive_content_id_Putting_Things_Together

下面是 我对 Raspberry Pi 所做的配置更改：

/boot/config.txt

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[all]

[pi4]
# Run as fast as firmware / board allows
arm_boost=1

[all]

dtoverlay=i2c-gpio,bus=3,i2c_gpio_sda=23,i2c_gpio_scl=24,i2c_gpio_delay_us=2

dtoverlay=dpi18
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
framebuffer_width=864
framebuffer_height=480

enable_dpi_lcd=1

display_default_lcd=1

dpi_group=2
dpi_mode=87

dpi_output_format=458773
hdmi_timings=854 0 14 4 12 480 0 2 3 9 0 0 0 60 0 32000000 3

/etc/rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
printf "My IP address is %s\n" "$_IP"
fi

sudo i2cset -y 3 0x1b 0x0c 0x00 0x00 0x00 0x13 i
sudo i2cset -y 3 0x1b 0x0b 0x00 0x00 0x00 0x00 i

exit 0

测试模式即使是快速连续工作、我也认为没有时序问题。 下面是一个 Python 脚本、我使用它来检查测试模式：

import os
import time

os.system('i2cset -y 3 0x1b 0x0c 0x00 0x00 0x00 0x1b i')
os.system('i2cset -y 3 0x1b 0x0b 0x00 0x00 0x00 0x01 i')

for index in range(1, 14):
PATTERN = "{0:#0{1}x}".format(index, 4)
os.system('i2cset -y 3 0x1b 0x11 0x00 0x00 0x00 ' + PATTERN + ' i')

为什么显示器卡在闪屏上、仅闪烁、不显示 Raspberry Pi OS 桌面？ 所有教程或讨论似乎都能立即工作。