RaspberryPi Zero / Zero W and UART plugin
Posted: Tue Jul 27, 2021 12:01 pm
Hello, I have problems with RaspberryPi Zero / Zero W and the UART plugin on ttyAMA0.
I use the QLC+ Buster Image.
Sometimes everything works wonderfully but after the next reboot not anymore.
I have an oscilloscope connected to the TX pin from the RPi, the baud rate then fluctuates when the DMX output stalls.
To rule out that it is due to ttyS0 / BT /miniUART I have also configured an RPi Zero without BT/WLAN with a fresh Buster image. Again, the problem often appears after a reboot.
Does anyone have an idea?
my cmdline.txt
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my config.txt
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I use the QLC+ Buster Image.
Sometimes everything works wonderfully but after the next reboot not anymore.
I have an oscilloscope connected to the TX pin from the RPi, the baud rate then fluctuates when the DMX output stalls.
To rule out that it is due to ttyS0 / BT /miniUART I have also configured an RPi Zero without BT/WLAN with a fresh Buster image. Again, the problem often appears after a reboot.
Does anyone have an idea?
my cmdline.txt
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Code: Select all
dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=76fe5b12-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet
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Code: Select all
# 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 this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=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 the lirc-rpi module
#dtoverlay=lirc-rpi
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
[all]
dtoverlay=vc4-fkms-v3d
# QLC+ workaround for headless case
hdmi_force_hotplug=1
enable_uart=1
init_uart_clock=16000000