Hi Richard, Probably it is a MacOS issue.
I just confirmed it still working fine on Linux (Ubuntu 23.04). These are the step-by-step process: --------------------------------------------------------------------------------------- $ git clone -b 1.1.2 https://github.com/raspberrypi/pico-sdk.git $ sudo mkdir /opt/pico $ sudo mv pico-sdk /opt/pico/ $ make distclean $ export PICO_SDK_PATH=/opt/pico/pico-sdk $ ./tools/configure.sh raspberrypi-pico:nsh $ make -j $ ls -l nuttx.uf2 -rw-rw-r-- 1 alan alan 254464 jul 21 14:41 nuttx.uf2 Press and hold BOOTSEL button, then plug the USB cable Copy nuttx.uf2 to Rasp Pico Disk volume Plug a 3.3V USB/Serial adapter this way: USB/Serial RaspPico -------------+------------ GND | GND RXD | GP0 TXD | GP1 Configure minicom or other serial console tool to use 115200 @ 8n1 (disable HW Flow Control) Remove the cable and connect again Press enter and you will see the NuttShell: nsh> uname -a NuttX 12.2.1 4e24230d4a Jul 21 2023 14:41:45 arm raspberrypi-pico nsh> free total used free largest nused nfree Umem: 264364 8796 255568 255568 38 1 nsh> --------------------------------------------------------------------------------------- BR, Alan On 7/20/23, Richard Fox <nu...@richfox.org> wrote: > Hi, > > I'm new to NuttX and to the pico-sdk, (and RTOSs in general). I have an > Adafruit Feather RP2040 that I was using to experiment with NuttX and I > haven't been able to get either the nsh or usbnsh apps to work, (and I > haven't really tried anything else). > > I have the Feather RP2040 connected to my Mac using an Adafruit #954 USB > to TTL serial cable (pre 2014). I have the device wired so that the > serial cable is connected to GND, Green TX to rp2040:GPIO1, white RX to > rp2040:GPIO0. > > Using this configuration, I have successfully built installed, and > tested the pico-sdk "pico-examples/build/uart/hello_uart" example that > prints a string via the serial cable to a terminal emulator on the Mac. > This was operating at 115200 baud. > > I've also successfully built and installed the bi-directional example > from the Arduino distribution: Arduino:Built-in Examples:4. > Communications:SerialPassThrough and am able to send to and receive from > the Feather RP2040 through the serial cable and through the > cu.usbmodem101 device that gets created when the controller is attached > to my Mac with a USB cable. Communications were at 9600 baud. > > I have the following environment variables set in my build terminal. > export PICO_SDK_PATH=/opt/pico/pico-sdk > export HOST_PLATFORM=mac > > I can start the build process and it seems to succeed: > > make distclean > ./tools/configure.sh -m adafruit-feather-rp2040:nsh > make -j4 > ... > LN: platform/board to > /Users/rfox/Documents/Computers/rtos/apache-nuttx/nuttxspace/apps/platform/dummy > Register: hello > Register: nsh > Register: getprime > Register: sh > Register: ostest > CPP: > /Users/rfox/Documents/Computers/rtos/apache-nuttx/nuttxspace/nuttx/boards/arm/rp2040/adafruit-feather-rp2040/scripts/adafruit-feather-rp2040-flash.ld-> > > /Users/rfox/Documents/Computers/rtos/apacheLD: nuttx > > > Generating: nuttx.uf2 > tools/rp2040/elf2uf2 nuttx nuttx.uf2; > Done. > > Then I copy the uf2 binary over to the mounted controller volume using > the handy BOOTSEL feature. > After the volume is disconnected and my Mac has harped at me for doing > it wrong, I open a screen to the device: > > screen /dev/cu.usbserial-110 115200 > > Hit return a few times and get no response. > > I've tried rebooting the controller, disconnecting and reconnecting the > serial cable, doing both. Nothing seems to make any difference. I've > tried swapping the RX/TX connections just in case there was a pin > assignment setting different than the pico-sdk and arduino setups but it > didn't make any difference. > > I've tried also using the usbnsh code but there is never a second device > created in /dev/ to connect to. That is, /dev/cu.usbserial* device is > present from the serial cable connection but the "modem" device that > gets created by using the arduino passthrough, for example, > /dev/cu.usbmodem101 does not exist when the usbnsh configured RP2040 is > connected to a USB port. > > I figure that I'm missing some step, perhaps something I need to set > using the optional mkconfig step that I'm skipping over but the solution > eludes me. > > Thanks for any advice, > Rich. > > >
