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Add information on targetting the Pico W. Fixes #895 (#896)

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* Add information on targetting the Pico W

Based on comments in https://github.com/raspberrypi/pico-sdk/issues/895 which pointed here:
https://datasheets.raspberrypi.com/picow/connecting-to-the-internet-with-pico-w.pdf

I didn't add the pdf link as there are no links to other pdfs.

* Rewording

* stray comma

Co-authored-by: Graham Sanderson <graham.sanderson@gmail.com>
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David Greaves 2022-11-30 19:08:04 +00:00 committed by GitHub
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README.md
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@ -159,7 +159,6 @@ instructions for other platforms, and just in general, we recommend you see [Ras
Note this example uses the default UART for _stdout_; Note this example uses the default UART for _stdout_;
if you want to use the default USB see the [hello-usb](https://github.com/raspberrypi/pico-examples/tree/master/hello_world/usb) example. if you want to use the default USB see the [hello-usb](https://github.com/raspberrypi/pico-examples/tree/master/hello_world/usb) example.
1. Setup a CMake build directory. 1. Setup a CMake build directory.
For example, if not using an IDE: For example, if not using an IDE:
``` ```
@ -168,6 +167,16 @@ instructions for other platforms, and just in general, we recommend you see [Ras
$ cmake .. $ cmake ..
``` ```
When building for a board other than the Raspberry Pi Pico, you should pass `-DPICO_BOARD=board_name` to the `cmake` command above, e.g. `cmake -DPICO_BOARD=pico_w ..`
to configure the SDK and build options accordingly for that particular board.
Doing so sets up various compiler defines (e.g. default pin numbers for UART and other hardware) and in certain
cases also enables the use of additional libraries (e.g. wireless support when building for `PICO_BOARD=pico_w`) which cannot
be built without a board which provides the requisite functionality.
For a list of boards defined in the SDK itself, look in [this directory](src/boards/include/boards) which has a
header for each named board.
1. Make your target from the build directory you created. 1. Make your target from the build directory you created.
```sh ```sh
$ make hello_world $ make hello_world