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by DRAgon715205
Thu Mar 19, 2020 12:54 pm
Forum: Device Tree
Topic: raspberry pi 4B PWM audio do not work
Replies: 7
Views: 493

Re: raspberry pi 4B PWM audio do not work

thank you very much
by DRAgon715205
Thu Mar 19, 2020 12:39 pm
Forum: Device Tree
Topic: raspberry pi 4B PWM audio do not work
Replies: 7
Views: 493

Re: raspberry pi 4B PWM audio do not work

So now I can not solve this problem?

I need wait update ?
by DRAgon715205
Thu Mar 19, 2020 12:35 pm
Forum: General discussion
Topic: PWM pins on the Pi 4
Replies: 6
Views: 6623

Re: PWM pins on the Pi 4

Dear : raspberry pi 4B PWM audio do not work I use lastest 2020-02-05-raspbian-buster-full . I add Code: Select all dtoverlay=pwm this code at config.txt but GPIO18 do not have audio output but can hear sound form earphone jack at raspberry pi 4B, the same iamge and sd card, GPIO18 have audio output...
by DRAgon715205
Thu Mar 19, 2020 12:06 pm
Forum: Device Tree
Topic: raspberry pi 4B PWM audio do not work
Replies: 7
Views: 493

raspberry pi 4B PWM audio do not work

Dear : I use lastest 2020-02-05-raspbian-buster-full . I add dtoverlay=pwm this code at config.txt but GPIO18 do not have audio output but can hear sound form earphone jack at raspberry pi 4B, the same iamge and sd card, GPIO18 have audio output at raspberry pi 3B So what can I do to enable pwm audi...
by DRAgon715205
Sun Jun 30, 2019 12:34 pm
Forum: Troubleshooting
Topic: raspberry pi 4 PI4 7" DPI display can not display full-screen
Replies: 14
Views: 1321

raspberry pi 4 PI4 7" DPI display can not display full-screen

I get my raspberry pi 4 , But with old configuration , the LCD can display OK at PI3 and display without full-screen at PI4

Do I need to add some codes at PI4 to make the DPI LCD display full-screen ?
by DRAgon715205
Tue May 21, 2019 1:03 pm
Forum: Gaming
Topic: recalbox 6.0-DragonBlaze /recalbox 4.1 gpio buttons do not work at raspberry pi zero but work at pi3
Replies: 1
Views: 1175

recalbox 6.0-DragonBlaze /recalbox 4.1 gpio buttons do not work at raspberry pi zero but work at pi3

I have try mk_arcade_joystick_rpi at the newest recalbox 4.1 I active the GPIO buttons by this code nano /recalbox/share/system/recalbox.conf controllers.gpio.enabled=1 controllers.gpio.args=map=5 gpio=5,6,16,13,26,19,21,20,14,12,15,23,3 this work at pi3/3B+ but do not work at zero/zero W anyone hav...
by DRAgon715205
Sat Mar 02, 2019 4:48 am
Forum: Troubleshooting
Topic: how to config DSI at config.txt to make RGB LCD to DSI work
Replies: 0
Views: 213

how to config DSI at config.txt to make RGB LCD to DSI work

I have a general 5 inch 800x480 RGB lcd , then use a convert chip, convert RGB to DSI, then connect to raspberry pi DSI port but the LCD do not display I have tried ust STM32 to drive the DSI port, the RGB LCD can display OK But at raspberry pi do not display wether I need add some Configuration cod...
by DRAgon715205
Fri Mar 01, 2019 9:45 am
Forum: Compute Module
Topic: wiringPi problems with CM3+
Replies: 14
Views: 2107

Re: wiringPi problems with CM3+

but which is A+ not CM3 +

and do not the same error , which is error model:14 , my is error model 16

as which method,

I need make which changes ? , to change A+ to CM3+ ?
by DRAgon715205
Fri Mar 01, 2019 4:45 am
Forum: Compute Module
Topic: wiringPi problems with CM3+
Replies: 14
Views: 2107

Re: wiringPi problems with CM3+

hello

I have got the 2.48 version wiringpi

the same wiringpi program can work at CM3(GPIO I2C SPI all work well)
But work error at CM3+ (same gpio do not run and I2C SPI PWM do not work with the same Progame)

please tell me how can I solve this problem ??
by DRAgon715205
Tue Sep 26, 2017 10:42 am
Forum: Compute Module
Topic: raspberry pi computer 3 CM3 JSB HOST for using what?
Replies: 3
Views: 1183

raspberry pi computer 3 CM3 JSB HOST for using what?

Dear

I get a CM3 and buy a official RPI CMIO V3 board

I see a USB HOST(J14) at the RPI CMIO V3 board

But after I have seen the official information about the CM3, I just know how to use JSB SLAVE(J15).

I still do not how to use USB HOST(J14) for what

somebody konw how to use it ?
by DRAgon715205
Thu Mar 09, 2017 9:35 am
Forum: Compute Module
Topic: raspberry pi computer 3 CM3 drive 7 inch official touch scre
Replies: 2
Views: 1123

raspberry pi computer 3 CM3 drive 7 inch official touch scre

How can The raspberry pi computer 3/CM3 drive 7 inch official touch screen


How driver two 7 inch official touch screen by CM3 port DISP0 and DISP1
by DRAgon715205
Wed Mar 08, 2017 7:44 am
Forum: Troubleshooting
Topic: 2017-03-02-raspbian-jessie tfp401 HDMI LCD display bug
Replies: 1
Views: 623

Re: 2017-03-02-raspbian-jessie tfp401 HDMI LCD display bug

all HDMI LCD drived by a chip tfp401 like waveshare7inch HDMI LCD (B) and 7inch HDMI LCD (C) have same problem
by DRAgon715205
Wed Mar 08, 2017 7:42 am
Forum: Troubleshooting
Topic: 2017-03-02-raspbian-jessie tfp401 HDMI LCD display bug
Replies: 1
Views: 623

2017-03-02-raspbian-jessie tfp401 HDMI LCD display bug

I use a 5 inch HDMI LCD at 2017-03-02-raspbian-jessie

The 5 inch HDMI LCD drived by a chip tfp401 can work well at a old raspbian OS

But at the lastest raspbian OS have some Color lines at the left of the LCD
And the display is not very clearly
How can I solve the problem?
display12-.jpg
display12-.jpg (9.54 KiB) Viewed 623 times
by DRAgon715205
Tue Mar 07, 2017 10:50 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspbian 2017-03-02 bug fbtft touch calibrate X/Y Inverted
Replies: 3
Views: 2499

Re: Raspbian 2017-03-02 bug fbtft touch calibrate X/Y Invert

I have understand why It become that The following is coming from swkim01 ------------------------------------------------------------------------------------------------------- That is because now x server uses libinput to handle input devices instead of evdev. As to coordination transformation mat...
by DRAgon715205
Tue Mar 07, 2017 10:16 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspbian 2017-03-02 bug fbtft touch calibrate X/Y Inverted
Replies: 3
Views: 2499

Raspbian 2017-03-02 bug fbtft touch calibrate X/Y Inverted

The lastest raspbian OS have updated to 2017-03-02-raspbian-jessie But I have some questiones at fbtft Device Tree (fbtft old driver can display ok but touch Inverted ) my LCD with touch chip xpt2046 1 The calibration file “/etc/X11/xorg.conf.d/99-calibration.conf” is not working Now. if you change ...
by DRAgon715205
Mon Mar 06, 2017 9:42 am
Forum: Troubleshooting
Topic: raspberry pi 99-calibration.conf not work Touch revers
Replies: 0
Views: 451

raspberry pi 99-calibration.conf not work Touch revers

The lastest raspbian OS have updated to 2017-03-02-raspbian-jessie But the touch can not work well ,I use waveshare 3.5inch LCD with ads7846/xpt2046 The file 99-calibration.conf can not work well, seem the file have stopped to work but it can work well at old version Raspbian the Touch reverse, touc...
by DRAgon715205
Mon Mar 06, 2017 8:38 am
Forum: Compute Module
Topic: raspberry pi CM3 Failed to run camera app
Replies: 1
Views: 597

Re: raspberry pi CM3 Failed to run camera app

The problem have been solved by using the lastest raspbian OS 2017-03-02-raspbian-jessie
by DRAgon715205
Sat Mar 04, 2017 8:55 am
Forum: Compute Module
Topic: raspberry pi CM3 Failed to run camera app
Replies: 1
Views: 597

raspberry pi CM3 Failed to run camera app

I have bought a raspberry pi computer 3 (CM3) and two RPI camera I do as the following weblink https://www.raspberrypi.org/documentation/hardware/computemodule/cmio-camera.md I drive CAM0 with using the following code raspivid -t 0 -cs 0 All OK. But when I want to use CAM1 , use the following code r...
by DRAgon715205
Mon Feb 27, 2017 5:56 pm
Forum: Troubleshooting
Topic: raspberry pi computer 3 CM3 can not enter serial Teminal
Replies: 1
Views: 431

raspberry pi computer 3 CM3 can not enter serial Teminal

I have a raspberry pi 3 model B and a CM3

Use same raspbian OS and same configure

But PI3 can enter the serial Teminal CM3 can not

I connect UART to CM3 GPIO14 GPIO15
by DRAgon715205
Thu Feb 09, 2017 4:34 am
Forum: Beginners
Topic: computer Module 3 can not boot
Replies: 1
Views: 493

computer Module 3 can not boot

I have bought a raspberry pi computer Module 3 and official mother board I download the raspbian OS from the official weblink and burn the raspbian image to my SD card But when I power the mother board, the yellow LED and red LED always are lighted And the HDMI do not have any output please tell me ...
by DRAgon715205
Wed Aug 31, 2016 4:38 am
Forum: Graphics, sound and multimedia
Topic: Why ili9486 LCD need 74HC4094 to make spi to parallel
Replies: 1
Views: 1645

Why ili9486 LCD need 74HC4094 to make spi to parallel

Why ili9486 LCD need 74HC4094 to make spi interface to parallel interface LCD but HX8357D LCD just need spi [1]. Why ili9486 LCD need 74HC4094 to make spi interface to parallel interface LCD? like this: https://github.com/notro/fbtft/wiki/SPI-interface-circuit#test-script --The 3.5inch ili9486 LCD l...

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