espressif_tinyusb/examples

Examples

Clone this repo

$ git clone https://github.com/hathach/tinyusb tinyusb
$ cd tinyusb

Fetch submodule MCUs drivers

TinyUSB examples includes external repos aka submodules to provide low-level MCU peripheral's driver to compile with. Therefore we will firstly fetch those mcu driver repo by running this command in the top folder repo

$ git submodule update --init --recursive

It will takes a bit of time due to the number of supported MCUs, luckily we only need to do this once. Or if you only want to test with a specific mcu, you could only update its driver submodule

Build

Here is the list of supported Boards that should work out of the box with provided examples (hopefully). To build example, first change directory to example folder.

$ cd examples/device/cdc_msc

Then compile with make BOARD=[your_board] all, for example

$ make BOARD=feather_nrf52840_express all

Debug Log

Log Level

Should you have an issue running example and/or submitting an bug report. You could enable TinyUSB built-in debug logging with optional LOG=. LOG=1 will only print out error message, LOG=2 print more information with on-going events. LOG=3 or higher is not used yet.

$ make LOG=2 BOARD=feather_nrf52840_express all

Logger

By default log message is printed via on-board UART which is slow and take lots of CPU time comparing to USB speed. If your board support on-board/external debugger, it would be more efficient to use it for logging. There are 2 protocols:

• LOGGER=rtt: use Segger RTT protocol
  • Cons: requires jlink as the debugger.
  • Pros: work with most if not all MCUs
  • Software viewer is JLink RTT Viewer/Client/Logger which is bundled with JLink driver package.
• LOGGER=swo: Use dedicated SWO pin of ARM Cortex SWD debug header.
  • Cons: only work with ARM Cortex MCUs minus M0
  • Pros: should be compatible with more debugger that support SWO.
  • Software viewer should be provided along with your debugger driver.

$ make LOG=2 LOGGER=rtt BOARD=feather_nrf52840_express all
$ make LOG=2 LOGGER=swo BOARD=feather_nrf52840_express all

Flash

flash target will use the default on-board debugger (jlink/cmsisdap/stlink/dfu) to flash the binary, please install those support software in advance. Some board use bootloader/DFU via serial which is required to pass to make command

$ make BOARD=feather_nrf52840_express flash
$ make SERIAL=/dev/ttyACM0 BOARD=feather_nrf52840_express flash

Since jlink can be used with most of the boards, there is also flash-jlink target for your convenience.

$ make BOARD=feather_nrf52840_express flash-jlink

Some board use uf2 bootloader for drag & drop in to mass storage device, uf2 can be generated with uf2 target

$ make BOARD=feather_nrf52840_express all uf2