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Espressif IoT Development Framework for ESP32-XX
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Neil Kolban e14d65d704 Update to ESP_ERROR_CHECK 
See request from ESP_Angus here:
https://esp32.com/viewtopic.php?f=18&t=1179

Merges #339 https://github.com/espressif/esp-idf/pull/339
 		2017-03-03 14:59:15 +11:00
components Update to ESP_ERROR_CHECK 2017-03-03 14:59:15 +11:00
docs docs: Fix typo in build-system.rst 2017-03-03 14:59:15 +11:00
examples examples/ethernet: Same sense of meaning SW_STRAP 2017-03-03 14:59:15 +11:00
make Merge branch 'feature/enable_qio_directly' into 'master' 2017-03-03 11:25:52 +08:00
tools Merge branch 'feature/docs_partition_ota_flash' into 'master' 2017-03-03 11:27:01 +08:00
.gitignore docs: use custom roles to generate GitHub links 2017-01-20 17:22:47 +08:00
.gitlab-ci.yml Build system: Add new BATCH_BUILD flag to disable interactive parts of the build 2017-02-22 11:59:37 +11:00
.gitmodules Update esptool.py to v2.0-beta1 2017-01-10 14:04:54 +11:00
CONTRIBUTING.rst docs: use custom roles to generate GitHub links 2017-01-20 17:22:47 +08:00
Kconfig build system: fix setting C**FLAGS from project makefile 2016-10-20 17:17:54 +08:00
LICENSE Initial public version 2016-08-17 23:08:22 +08:00
README.md README: Add some tips on using menuconfig 2017-02-15 09:42:46 +11:00
add_path.sh Add espcoredump to the add_path shell helper 2017-02-12 22:48:41 +00:00

README.md

Espressif IoT Development Framework

alt text

ESP-IDF is the official development framework for the ESP32 chip.

Developing With the ESP-IDF

Setting Up ESP-IDF

See setup guides for detailed instructions to set up the ESP-IDF:

Finding a Project

As well as the esp-idf-template project mentioned in the setup guide, ESP-IDF comes with some example projects in the examples directory.

Once you've found the project you want to work with, change to its directory and you can configure and build it.

Configuring the Project

make menuconfig

  • Opens a text-based configuration menu for the project.
  • Use up & down arrow keys to navigate the menu.
  • Use Enter key to go into a submenu, Escape key to go out or to exit.
  • Type ? to see a help screen. Enter key exits the help screen.
  • Use Space key, or Y and N keys to enable (Yes) and disable (No) configuration items with checkboxes "[*]"
  • Pressing ? while highlighting a configuration item displays help about that item.
  • Type / to search the configuration items.

Once done configuring, press Escape multiple times to exit and say "Yes" to save the new configuration when prompted.

Compiling the Project

make all

... will compile app, bootloader and generate a partition table based on the config.

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

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.

You don't need to run make all before running make flash, make flash will automatically rebuild anything which needs it.

Viewing Serial Output

The make monitor target will use the already-installed miniterm (a part of pyserial) to display serial output from the ESP32 on the terminal console.

Exit miniterm by typing Ctrl-].

To flash and monitor output in one pass, you can run:

make flash monitor

Compiling & Flashing Just 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.

(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.)

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:

make -j5 flash monitor

The Partition Table

Once you've compiled your project, the "build" directory will contain a binary file with a name like "my_app.bin". This is an ESP32 image binary that can be loaded by the bootloader.

A single ESP32's flash can contain multiple apps, as well as many different kinds of data (calibration data, filesystems, parameter storage, etc). For this reason a partition table is flashed to offset 0x4000 in the flash.

Each entry in the partition table has a name (label), type (app, data, or something else), subtype and the offset in flash where the partition is loaded.

The simplest way to use the partition table is to make menuconfig and choose one of the simple predefined partition tables:

  • "Single factory app, no OTA"
  • "Factory app, two OTA definitions"

In both cases the factory app is flashed at offset 0x10000. If you make partition_table then it will print a summary of the partition table.

For more details about partition tables and how to create custom variations, view the docs/partition-tables.rst file.

Erasing Flash

The make flash target does not erase the entire flash contents. However it is sometimes useful to set the device back to a totally erased state, particularly when making partition table changes or OTA app updates. To erase the entire flash, run make erase_flash.

This can be combined with other targets, ie make erase_flash flash will erase everything and then re-flash the new app, bootloader and partition table.

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