kopia lustrzana https://github.com/majbthrd/pico-debug
25 wiersze
1.3 KiB
Markdown
25 wiersze
1.3 KiB
Markdown
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## Description
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RP2040 has two ARM Cortex-M0+ cores, and the second core normally remains dormant.
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pico-debug runs on one core in a RP2040 and provides a USB CMSIS-DAP interface to debug the other core. No hardware is added; it is as if there were a virtual debug pod built-in.
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Boot the RP2040 with the BOOTSEL button pressed, copy over pico-debug.uf2, and it immediately reboots as a CMSIS-DAP adapter. pico-debug loads as a RAM only .uf2 image, meaning that it is never written to flash and doesn't replace existing user code.
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*All* 264kBytes of SRAM on the RP2040 is available for running user code; pico-debug shoehorns itself entirely into the 16kBytes of XIP_SRAM (aka flash cache).
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If viewing this on github, a pre-built binary is available for download on the right under "Releases".
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## Caveats whilst using pico-debug
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- the flash cache cannot be used by the user code, as pico-debug is using this memory
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- user code cannot reconfigure the PLL and clocks, as the USB peripheral needs this
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- the USB peripheral is used to provide the debugger, so the user code cannot use it as well
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## License
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TinyUSB and code specific to pico-debug is licensed under the [MIT license](https://opensource.org/licenses/MIT).
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ARM's CMSIS_5 code is licensed under the [Apache 2.0 license](https://opensource.org/licenses/Apache-2.0).
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