stdio over USB-C

[fhoedemakers]

I want to use the usb port for printing debug statements over printf by adding pico_enable_stdio_usb(PicoSystem_InfoNes 1) to my CMakeLists.txt

But It seems that connecting the PicoSystem via USB-C to a Raspberry Pi does not create a character device file /dev/ttyACM0, so i can't connect using minicom

Below the /var/log/messages when connecting a Raspberry Pi Pico via USB to a Raspberry Pi. It creates ttyACM0

Aug 19 11:22:23 rpi400 kernel: [ 2774.904957] usb 1-1.3.3: new full-speed USB device number 9 using xhci_hcd
Aug 19 11:22:23 rpi400 kernel: [ 2775.036425] usb 1-1.3.3: New USB device found, idVendor=2e8a, idProduct=000a, bcdDevice= 1.00
Aug 19 11:22:23 rpi400 kernel: [ 2775.036463] usb 1-1.3.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3Aug 19 11:22:23 rpi400 kernel: [ 2775.036480] usb 1-1.3.3: Product: Pico
Aug 19 11:22:23 rpi400 kernel: [ 2775.036494] usb 1-1.3.3: Manufacturer: Raspberry Pi
Aug 19 11:22:23 rpi400 kernel: [ 2775.036507] usb 1-1.3.3: SerialNumber: E6614864D3123934
Aug 19 11:22:23 rpi400 mtp-probe: checking bus 1, device 9: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3/1-1.3.3"
Aug 19 11:22:23 rpi400 mtp-probe: bus: 1, device: 9 was not an MTP device
Aug 19 11:22:23 rpi400 kernel: [ 2775.105653] cdc_acm 1-1.3.3:1.0: ttyACM0: USB ACM device
Aug 19 11:22:23 rpi400 kernel: [ 2775.105822] usbcore: registered new interface driver cdc_acm
Aug 19 11:22:23 rpi400 kernel: [ 2775.105835] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
Aug 19 11:22:23 rpi400 mtp-probe: checking bus 1, device 9: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3/1-1.3.3"
Aug 19 11:22:23 rpi400 mtp-probe: bus: 1, device: 9 was not an MTP device

Below the output when connecting the PicoSystem, does not create a character device:

Aug 19 11:25:05 rpi400 kernel: [ 2937.230889] usb 1-1.3.4: new full-speed USB device number 11 using xhci_hcd
Aug 19 11:25:05 rpi400 kernel: [ 2937.362189] usb 1-1.3.4: New USB device found, idVendor=2e8a, idProduct=000a, bcdDevice= 1.00
Aug 19 11:25:05 rpi400 kernel: [ 2937.362207] usb 1-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 19 11:25:05 rpi400 kernel: [ 2937.362213] usb 1-1.3.4: Product: Pico
Aug 19 11:25:05 rpi400 kernel: [ 2937.362218] usb 1-1.3.4: Manufacturer: Raspberry Pi
Aug 19 11:25:05 rpi400 kernel: [ 2937.362222] usb 1-1.3.4: SerialNumber: E461184767453621
Aug 19 11:25:05 rpi400 mtp-probe: checking bus 1, device 11: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3/1-1.3.4"
Aug 19 11:25:05 rpi400 mtp-probe: bus: 1, device: 11 was not an MTP device
Aug 19 11:25:05 rpi400 mtp-probe: checking bus 1, device 11: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.3/1-1.3.4"
Aug 19 11:25:05 rpi400 mtp-probe: bus: 1, device: 11 was not an MTP device