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README: Add version-specific links

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Make it clearer how the README fits in with the docs.
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ESP-IDF is the official development framework for the [ESP32](https://espressif.com/en/products/hardware/esp32/overview) chip.
# Developing With the ESP-IDF
# Developing With ESP-IDF
## Setting Up ESP-IDF
See setup guides for detailed instructions to set up the ESP-IDF:
* [Windows Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/windows-setup.html)
* [Mac OS Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/macos-setup.html)
* [Linux Setup Guide](https://esp-idf.readthedocs.io/en/latest/get-started/linux-setup.html)
* [Getting Started Guide for the stable ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/)
* [Getting Started Guide for the latest (master branch) ESP-IDF version](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/)
## Finding a Project
As well as the [esp-idf-template](https://github.com/espressif/esp-idf-template) project mentioned in the setup guide, ESP-IDF comes with some example projects in the [examples](examples) directory.
As well as the [esp-idf-template](https://github.com/espressif/esp-idf-template) project mentioned in Getting Started, ESP-IDF comes with some example projects in the [examples](examples) directory.
Once you've found the project you want to work with, change to its directory and you can configure and build it.
To start your own project based on an example, copy the example project directory outside of the ESP-IDF directory.
# Quick Reference
See the Getting Started guide links above for a detailed setup guide. This is a quick reference for common commands when working with ESP-IDF projects:
## Configuring the Project
`make menuconfig`
@ -36,15 +41,17 @@ Once done configuring, press Escape multiple times to exit and say "Yes" to save
## Compiling the Project
`make all`
`make -j4 all`
... will compile app, bootloader and generate a partition table based on the config.
NOTE: The `-j4` option causes `make` to run 4 parallel jobs. This is much faster than the default single job. The recommended number to pass to this option is `-j(number of CPUs + 1)`.
## Flashing the Project
When `make all` finishes, it will print a command line to use esptool.py to flash the chip. However you can also do this from make by running:
`make flash`
`make -j4 flash`
This will flash the entire project (app, bootloader and partition table) to a new chip. The settings for serial port flashing can be configured with `make menuconfig`.
@ -56,24 +63,24 @@ The `make monitor` target uses the [idf_monitor tool](https://esp-idf.readthedoc
Exit the monitor by typing Ctrl-].
To flash and monitor output in one pass, you can run:
To build, flash and monitor output in one pass, you can run:
`make flash monitor`
`make -j4 flash monitor`
## Compiling & Flashing Just the App
## Compiling & Flashing Only the App
After the initial flash, you may just want to build and flash just your app, not the bootloader and partition table:
* `make app` - build just the app.
* `make app-flash` - flash just the app.
`make app-flash` will automatically rebuild the app if it needs it.
`make app-flash` will automatically rebuild the app if any source files have changed.
(In normal development there's no downside to reflashing the bootloader and partition table each time, if they haven't changed.)
## Parallel Builds
ESP-IDF supports compiling multiple files in parallel, so all of the above commands can be run as `make -jN` where `N` is the number of parallel make processes to run (generally N should be equal to or one more than the number of CPU cores in your system.)
ESP-IDF supports compiling multiple files in parallel, so all of the above commands can be run as `make -jN` where `N` is the number of parallel make processes to run (generally N should be equal to the number of CPU cores in your system, plus one.)
Multiple make functions can be combined into one. For example: to build the app & bootloader using 5 jobs in parallel, then flash everything, and then display serial output from the ESP32 run: