I am using a PI 4 to connect to an AVR. I have the latest PI OS Lite installed on the PI. I setup the extra uart ports in config.txt and wired everything up. I am using the tio app as a terminal to see the data shared with the AVR. Everything works when I start up the PI and AVR. However when the CPU temp on the PI is greater or equal to 38 degrees C, the data on the serial port begins to get corrupted. It gets worse as the temp approaches 40 degrees C.
I have tried this with two different PI 4's. I get the same result. I also added "core_freq=250" to make sure changing VPU clock speed isn't related. This did not seem to help.
Here's my current /boot/firmware/config.txt
I have tried this with two different PI 4's. I get the same result. I also added "core_freq=250" to make sure changing VPU clock speed isn't related. This did not seem to help.
Here's my current /boot/firmware/config.txt
Code:
# For more options and information see# http://rptl.io/configtxt# Some settings may impact device functionality. See link above for details# Uncomment some or all of these to enable the optional hardware interfaces#dtparam=i2c_arm=on#dtparam=i2s=on#dtparam=spi=on# Enable audio (loads snd_bcm2835)dtparam=audio=on# Additional overlays and parameters are documented# /boot/firmware/overlays/README# Automatically load overlays for detected camerascamera_auto_detect=1# Automatically load overlays for detected DSI displaysdisplay_auto_detect=1# Automatically load initramfs files, if foundauto_initramfs=1# Enable DRM VC4 V3D driverdtoverlay=vc4-kms-v3dmax_framebuffers=2# Don't have the firmware create an initial video= setting in cmdline.txt.# Use the kernel's default instead.disable_fw_kms_setup=1# Run in 64-bit modearm_64bit=1# Disable compensation for displays with overscandisable_overscan=1# Run as fast as firmware / board allowsarm_boost=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][all]core_freq=250dtoverlay=disable-btenable_uart=1dtoverlay=uart2dtoverlay=uart3dtoverlay=uart4Statistics: Posted by d1g1t4l_g33k — Mon Mar 25, 2024 6:07 pm