83 lines
2.9 KiB
Markdown
83 lines
2.9 KiB
Markdown
# Examples
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## Clone this repo
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```
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$ git clone https://github.com/hathach/tinyusb tinyusb
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$ cd tinyusb
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```
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## Fetch submodule MCUs drivers
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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
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```
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$ git submodule update --init --recursive
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```
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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
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## Build
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[Here is the list of supported Boards](docs/boards.md) that should work out of the box with provided examples (hopefully).
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To build example, first change directory to example folder.
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```
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$ cd examples/device/cdc_msc
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```
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Then compile with `make BOARD=[your_board] all`, for example
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```
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$ make BOARD=feather_nrf52840_express all
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```
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### Debug Log
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### Log Level
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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.
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```
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$ make LOG=2 BOARD=feather_nrf52840_express all
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```
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### Logger
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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:
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- `LOGGER=rtt`: use [Segger RTT protocol](https://www.segger.com/products/debug-probes/j-link/technology/about-real-time-transfer/)
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- Cons: requires jlink as the debugger.
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- Pros: work with most if not all MCUs
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- Software viewer is JLink RTT Viewer/Client/Logger which is bundled with JLink driver package.
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- `LOGGER=swo`: Use dedicated SWO pin of ARM Cortex SWD debug header.
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- Cons: only work with ARM Cortex MCUs minus M0
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- Pros: should be compatible with more debugger that support SWO.
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- Software viewer should be provided along with your debugger driver.
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```
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$ make LOG=2 LOGGER=rtt BOARD=feather_nrf52840_express all
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$ make LOG=2 LOGGER=swo BOARD=feather_nrf52840_express all
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```
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## Flash
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`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
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```
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$ make BOARD=feather_nrf52840_express flash
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$ make SERIAL=/dev/ttyACM0 BOARD=feather_nrf52840_express flash
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```
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Since jlink can be used with most of the boards, there is also `flash-jlink` target for your convenience.
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```
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$ make BOARD=feather_nrf52840_express flash-jlink
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```
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Some board use uf2 bootloader for drag & drop in to mass storage device, uf2 can be generated with `uf2` target
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```
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$ make BOARD=feather_nrf52840_express all uf2
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```
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