198 Two ports USB CDC device

198 : Two ports USB CDC device

Design render
  • Author: Maximo Balestrini
  • Description: USB CDC device with two ports each with a different application
  • GitHub repository
  • Clock: 48000000 Hz

PRELIMINARY INFO

How it works

The design works as Full Speed (12Mbit/s) USB communications device class (or USB CDC class).
Most of the code is based on this repo: https://github.com/ulixxe/usb_cdc

When connected to a pc the device should appear 1 or more serial ports. (COMX on Windows, /dev/ttyACMx on Linux and /dev/cu.usbmodemxxxx on OSX)
Linux requires that the user account belongs to the dialout group to grant permissions for virtual COM access.

Channel 0 application: Input to serial
When the value from one of the inputs change from 0 to 1 or 1 to 0 it sends a character to the port.

pin rise fall
input[0] A a
input[1] B b
input[2] C c
input[3] D d
input[4] E e
input[5] F f
input[6] G g
input[7] H h

How to test

(here goes a simple schematic some instructions)

External hardware

USB cable 1.5k resistor

optional: Buttons for the inputs

IO

#InputOutputBidirectional
0input_0usb_puusp_p
1input_1debug_ledusb_n
2input_2debug_usb_configured
3input_3debug_usb_tx_en
4input_4debug_frame[0]
5input_5debug_frame[1]
6input_6debug_frame[2]
7input_7debug_frame[3]

Chip location

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