111 lines
4.2 KiB
Markdown
111 lines
4.2 KiB
Markdown
There are essentially three ways to build your NodeMCU firmware: cloud build service, Docker image, dedicated Linux environment (possibly VM).
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## Tools
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### Cloud Build Service
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<del>NodeMCU "application developers" just need a ready-made firmware. There's a [cloud build service](http://nodemcu-build.com/) with a nice UI and configuration options for them.</del>
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Not available yet.
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### Docker Image
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Occasional NodeMCU firmware hackers don't need full control over the complete tool chain. They might not want to setup a Linux VM with the build environment. Docker to the rescue. Give [Docker NodeMCU build](https://hub.docker.com/r/marcelstoer/nodemcu-build/) a try.
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!!! caution
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Take note that you need to clone the repository including Git submodules just as described below for the Linux environment.
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### Linux Build Environment
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NodeMCU firmware developers commit or contribute to the project on GitHub and might want to build their own full fledged build environment with the complete tool chain.
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Run the following command for a new checkout from scratch. This will fetch the nodemcu repo, checkout the `dev-esp32` branch and finally pull all submodules:
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```
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git clone --branch dev-esp32 --recurse-submodules https://github.com/nodemcu/nodemcu-firmware.git nodemcu-firmware-esp32
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```
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The `make` command initiates the build process, which will start with the configuration menu to set the build options.
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!!! important
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GNU make version 4.0 or higher is required for a successful build. Versions 3.8.2 and below will produce an incomplete firmware image.
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Updating your clone from upstream needs an additional command to update the submodules as well:
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```
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git pull origin dev-esp32
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git submodule init #only if repo was cloned w/o submodules init
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git submodule update --recursive
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```
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Here is a video walk through by John Lauer (ChiliPeppr) of building the firmware in Linux from scratch with a fresh install of Ubuntu 19 so you can see all of the dependencies needed to get your build completed and flashed to your ESP32 device.
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[](https://www.youtube.com/watch?v=x6CGECsioYg "Video walk through for Linux Build Environment")
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## Build Options
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All configuration options are accessed from the file `sdkconfig`. It's advisable to set it up with the interactive `make menuconfig` - on a fresh checkout you're prompted to run through it by default.
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The most notable options are described in the following sections.
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### Select Modules
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Follow the menu path
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```
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Component config --->
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NodeMCU modules --->
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```
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Tick or untick modules as required.
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### UART default bit rate
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Follow the menu path
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```
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Component config --->
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Platform config --->
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UART console default bit rate --->
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```
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### CPU Frequency
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Follow the menu path
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```
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Component config --->
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ESP32-specific --->
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CPU frequency --->
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```
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### Stack Size
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If you experience random crashes then increase the stack size and feed back your observation on the project's issues list.
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Follow the menu path
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```
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Component config --->
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ESP32-specific --->
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Main task stack size --->
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```
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### Flashing Options
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Default settings for flashing the firmware with esptool.py are also configured with menuconfig:
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```
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Serial flasher config --->
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Default serial port
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Default baud rate
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Flash SPI mode --->
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Detect flash size when flashing bootloader --->
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```
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### Partition Table
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IDF's default partition table `Single factory app, no OTA` does not provide enough room for a firmware including large modules like e.g. `http` or `sodium`. To enable full feature sets, NodeMCU uses a custom partition table from `components/platform/partitions.csv` which allocates ~1.5 MB for the firmware image. During first boot, the firmware creates an additional partition for SPIFFS in the remaining flash space.
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For 2MB flash modules an alternative partition table available as `components/platform/partitions-2MB.csv`. It restricts the SPIFFS partition to ~448 kB and can be used with menuconfig:
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```
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Partition Table --->
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Partition Table (Custom partition table CSV)
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(components/platform/partitions-2MB.csv) Custom partition CSV file
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(0x10000) Factory app partition offset
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```
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