1bcd90d45d
system_* APIs cleanup This changeset is mostly about cleaning up `system_*` APIs and moving them from libcore. It has dragged a few more changes along, however. - `system_deep_sleep` deprecated, new name is `esp_deep_sleep` - `system_efuse_read_mac` deprecated, new name is `esp_efuse_read_mac` - `system_read/write_rtc_mem` removed (reason: we use linker to place code/data into RTC memory now) - `system_get_sdk_version` deprecated. Returns "master" for now. Support for compile-time and runtime version detection will be done in a separate MR. - `system_get_time` and variations have been deprecated. `gettimeofday` should be used instead. - `system_restart` deprecated, new name is `esp_restart`. Rewritten code to work correctly from any of the cores. - `system_restore` deprecated, `esp_wifi_restore` should be used instead. - `system_get_rst_info` removed (it wasn't in a header file) - RTC library has been updated to latest version - Logging output from `libfoo.a` goes through `foo_printf` function now, where `foo ` is any of the library names. For libraries other than rtc and phy, this is a temporary measure, until we finish switching to esp_log library and clean up all uses of printf/ets_printf. - ESP-IDF build will fail if any of the libraries have printf/ets_printf reference. - Added `esp_random` function which gets values from HW RNG. I have added code which makes sure the value is not polled too often (allows at least 16 APB cycles). Also added a header file for HW RNG (just one register). - Moved random number generation functions used by wpa library into wpa_supplicant component. See merge request !234 |
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| docs | ||
| examples | ||
| make | ||
| tools | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitmodules | ||
| add_path.sh | ||
| CONTRIBUTING.rst | ||
| Kconfig | ||
| LICENSE | ||
| README.md | ||
Using Espressif IoT Development Framework with the ESP32
Setting Up ESP-IDF
In the docs directory you will find per-platform setup guides:
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 your project
make menuconfig
Compiling your project
make all
... will compile app, bootloader and generate a partition table based on the config.
Flashing your 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.
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.
(There's no downside to reflashing the bootloader and partition table each time, if they haven't changed.)
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.
Resources
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The docs directory of the esp-idf repository contains source of esp-idf documentation.
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The esp32.com forum is a place to ask questions and find community resources.
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Check the Issues section on github if you find a bug or have a feature request. Please check existing Issues before opening a new one.
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If you're interested in contributing to esp-idf, please check the Contributions Guide.