While kiddo is home from school with a fever, I thought i would give NuttX a go again, living mostly in the Zephyr-world for the past years. Great job starting to implement cmake buildsystem, as keeping out-of-tree build directories greatly reduces the cases where you need to reclone the entire project due to build system errors, especially after a git pull without remembering to do a clean/distclean etc!
Im building from master, couldnt see any relevant changes since 12.8.0. Enabling flow control in the build instantly crashes the build as the function: esp_rxflowcontrol (arch/risc-v/src/common/espressif/esp_serial.c) is trying to call the function esp_lowputc_set_iflow which isnt included in the build. It seem to exist in: arch/risc-v/src/esp32c3-legacy/esp32c3_lowputc.c Is the entine ESP32 lineup being merged to a ton of hal/hal_ll files instead of the old pure implementation? Anyways, flowcontrol seem to be setup in esp_setup (esp_serial.c) so just using that code in esp_rxflowcontrol should fix this issue. I setup UART1 in RS485 mode: dl0 and dl1 enabled + enable rs485 mode. CTS blocks transmission as intended if CTS isnt pulled to GND. But RTS signal is just pulling the pin high for a few microseconds before going low again, right before transmitting the message. [image: image.png] The issue is seen when echoing to the serialport from nsh as when opening the serial device in a application and transmitting data. Is this a misconfiguration or a known issue?
