Unable to get ouput for samples/subsys/logging/logger and samples/philosophers

[nageshshamnur]

Describe the bug
Env details:
Ubuntu 20.04.2 LTS running zephyr project from master and zephyr sdk version: zephyr-sdk-0.12.3
Hardware: Arduino nano 33 ble sense.
I have setup the zephyr environment as explained in the page: https://docs.zephyrproject.org/latest/getting_started/index.html.
I have connected by Arduino nano 33 ble sense board to my ubuntu laptop via USB to mini-USB cable which powers my board and as well as help in flashing it via /dev/ttyACM0 port. I have also connected USB to TTL cable to my board in parallel to USB cable with only TX/RX pins on my arduino nano 33 ble so that i can watch the output on minicom.

To Reproduce
Steps to reproduce the behavior:

1. west build -p auto -b arduino_nano_33_ble samples/subsys/logging/logger

$ west build -p auto -b arduino_nano_33_ble samples/subsys/logging/logger
-- west build: making build dir /home/ohos-bld/zephyrproject/zephyr/build pristine
-- west build: generating a build system
Including boilerplate (Zephyr base): /home/ohos-bld/zephyrproject/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/ohos-bld/zephyrproject/zephyr/samples/subsys/logging/logger
-- Zephyr version: 2.6.0-rc1 (/home/ohos-bld/zephyrproject/zephyr), build: v2.6.0-rc1-336-g457a28bf78a4
-- Found Python3: /usr/bin/python3.8 (found suitable exact version "3.8.5") found components: Interpreter 
-- Found west (found suitable version "0.10.1", minimum required is "0.7.1")
-- Board: arduino_nano_33_ble
-- Cache files will be written to: /home/ohos-bld/.cache/zephyr
-- ZEPHYR_TOOLCHAIN_VARIANT not set, trying to locate Zephyr SDK
-- Using toolchain: zephyr 0.12.3 (/home/ohos-bld/zephyr-sdk-0.12.3)
-- Found dtc: /home/ohos-bld/zephyr-sdk-0.12.3/sysroots/x86_64-pokysdk-linux/usr/bin/dtc (found suitable version "1.5.0", minimum required is "1.4.6")
-- Found BOARD.dts: /home/ohos-bld/zephyrproject/zephyr/boards/arm/arduino_nano_33_ble/arduino_nano_33_ble.dts
-- Generated zephyr.dts: /home/ohos-bld/zephyrproject/zephyr/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: /home/ohos-bld/zephyrproject/zephyr/build/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: /home/ohos-bld/zephyrproject/zephyr/build/zephyr/include/generated/device_extern.h
Parsing /home/ohos-bld/zephyrproject/zephyr/samples/subsys/logging/logger/Kconfig
Loaded configuration '/home/ohos-bld/zephyrproject/zephyr/boards/arm/arduino_nano_33_ble/arduino_nano_33_ble_defconfig'
Merged configuration '/home/ohos-bld/zephyrproject/zephyr/samples/subsys/logging/logger/prj.conf'
Configuration saved to '/home/ohos-bld/zephyrproject/zephyr/build/zephyr/.config'
Kconfig header saved to '/home/ohos-bld/zephyrproject/zephyr/build/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- The ASM compiler identification is GNU
-- Found assembler: /home/ohos-bld/zephyr-sdk-0.12.3/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc
CMake Deprecation Warning at /home/ohos-bld/zephyrproject/modules/lib/civetweb/CMakeLists.txt:2 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Configuring done
CMake Warning (dev) at ../../../../cmake/linker/ld/target.cmake:33 (add_custom_command):
  Policy CMP0116 is not set: Ninja generators transform DEPFILEs from
  add_custom_command().  Run "cmake --help-policy CMP0116" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.
Call Stack (most recent call first):
  ../../../../CMakeLists.txt:1253 (configure_linker_script)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at ../../../../cmake/linker/ld/target.cmake:33 (add_custom_command):
  Policy CMP0116 is not set: Ninja generators transform DEPFILEs from
  add_custom_command().  Run "cmake --help-policy CMP0116" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.
Call Stack (most recent call first):
  ../../../../CMakeLists.txt:1198 (configure_linker_script)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Generating done
-- Build files have been written to: /home/ohos-bld/zephyrproject/zephyr/build
-- west build: building application
[1/146] Preparing syscall dependency handling

[139/146] Linking C executable zephyr/zephyr_prebuilt.elf

[146/146] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:       24760 B       960 KB      2.52%
            SRAM:        8928 B       256 KB      3.41%
        IDT_LIST:          0 GB         2 KB      0.00%

2. west flash --bossac="/home/ohos-bld/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac"

$ west flash --bossac="/home/ohos-bld/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac"
-- west flash: rebuilding
ninja: no work to do.
-- west flash: using runner bossac
Erase flash

Done in 0.002 seconds
Write 24760 bytes to flash (7 pages)
[==============================] 100% (7/7 pages)
Done in 1.082 seconds
Verify 24760 bytes of flash
[==============================] 100% (7/7 pages)
Verify successful
Done in 0.038 seconds
Set boot flash true

3. In another shell connect minicom sudo minicom -s with configuration as baud_rate=115200 partiy=None stopbits=1 but NO prints are visible on serial port /dev/ttyUSB0.
   $ sudo minicom -s

Welcome to minicom 2.7.1                                                                                                               
                                                                                                                                       
OPTIONS: I18n                                                                                                                          
Compiled on Dec 23 2019, 02:06:26.                                                                                                     
Port /dev/ttyUSB0, 18:59:12                                                                                                            
                                                                                                                                       
Press CTRL-A Z for help on special keys                                                                                                

Expected behavior
console display should be visible on minicom.

Impact
Unable to proceed with using arduino nano 33 ble board with zephyr

Logs and console output
as explained above

Environment (please complete the following information):

• OS: Ubuntu 20.04.2 LTS
• Toolchain: Zephyrproject: master and zephyr-sdk: zephyr-sdk-0.12.3
  Hardware: Arduino nano 33 ble sense.
• Commit SHA or Version used: 457a28b for zephyrproject.

Additional context
I have connected by Arduino nano 33 ble sense board to my ubuntu laptop via USB to mini-USB cable which powers my nano board and as well as help in flashing it via /dev/ttyACM0 port. I have also connected USB to TTL cable to my board in parallel to USB cable with only TX/RX pins on my arduino nano 33 ble boad.
flashing on usb port: /dev/ttyACM0
serial console (minicom): /dev/ttyUSB0

i even tried chaning prj.conf as explained in the issue: #26104 that also did not solve my problem.
Thanks!!!

[nageshshamnur]

This issue was happening due to incorrect connection of Rx/Tx pins in USB-TTL cable. Adding the image here for the benefit of all people.
Closing this issue as incorrect one.

[nageshshamnur]

Waiting for PR to be merged which is related to this issue. This is required since CDC_ACM gets disconnected once flashing is done.

[jfischer-no]

This issue was happening due to incorrect connection of Rx/Tx pins in USB-TTL cable. Adding the image here for the benefit of all people.
Closing this issue as incorrect one.

If it is not a bug then it does not need to be open.