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RIOT/boards/esp32s2-devkit/doc.txt
Gunar Schorcht 2ff7ae5de7 boards/esp32s2-devkit: enable RGB LED support
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/*
* Copyright (C) 2022 Gunar Schorcht
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup boards_esp32s2_devkit ESP32-S2-DevKit Board
* @ingroup boards_esp32s2
* @brief Support for generic ESP32S2 boards
* @author Gunar Schorcht <gunar@schorcht.net>
\section esp32s2_devkit ESP32-S2-DevKit
## Table of Contents {#esp32s2_devkit_toc}
1. [Overview](#esp32s2_devkit_overview)
2. [Hardware](#esp32s2_devkit_hardware)
1. [MCU](#esp32s2_devkit_mcu)
2. [Board Configuration](#esp32s2_devkit_board_configuration)
3. [Board Pinout](#esp32s2_devkit_pinout)
3. [Flashing the Device](#esp32s2_devkit_flashing)
## Overview {#esp32s2_devkit_overview}
The Espressif ESP32-S2-DevKit boards are a couple of boards that use one of
the following modules:
- ESP32-S2-MINI-1x-N4 module (ESP32-S2-DevKitM-1 board)
- ESP32-S2-MINI-1x-N4R2 module (ESP32-S2-DevKitM-1R board)
- ESP32-S2-SOLO-N4 module (ESP32-S2-DevKitC-1 board)
- ESP32-S2-SOLO-N4R2 module (ESP32-S2-DevKitC-1R board)
- ESP32-S2-WROOM module (ESP32-S2-Saola-1 board)
- ESP32-S2-WROVER-N4R2 module (ESP32-S2-Saola-1R board)
\image html "https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/_images/esp32-s2-devkitm-1-v1-annotated-photo.png" "Espressif ESP32-S2-DevKitM-1" width=600px
<br>
Due to the different modules used, the available versions of the
ESP32-S2-DevKit board differ regarding the Flash size, the integrated SPI RAM
and the SPI voltage. To be able to use all these different versions of the
board with a single board definition, used board version can be specified
by the variable `BOARD_VERSION` during compilation, for example:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BOARD=esp32s2-devkit BOARD_VERSION=esp32s2-devkitc-1r make ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following table shows the available board versions, the size of the
Flash and the SPI RAM as well as the value of the variable `BOARD_VERSION`
that is used to specify the board version.
<center>
| Board Version | Flash (Mode) | SPI RAM (Mode) | `BOARD_VERSION`
|:----------------------|:-------------|:---------------|:-----------------
| <b>ESP32-S2-DevKitM-1 | 4 MB (Quad) | - | `esp32s2-devkitm-1` (default)</b>
| ESP32-S2-DevKitM-1U | 4 MB (Quad) | - | `esp32s2-devkitm-1u`
| ESP32-S2-DevKitM-1R | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-devkitm-1r`
| ESP32-S2-DevKitM-1RU | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-devkitm-1ru`
| ESP32-S2-DevKitC-1 | 4 MB (Quad) | - | `esp32s2-devkitc-1`
| ESP32-S2-DevKitC-1U | 4 MB (Quad) | - | `esp32s2-devkitc-1u`
| ESP32-S2-DevKitC-1R | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-devkitc-1r`
| ESP32-S2-DevKitC-1RU | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-devkitc-1ru`
| ESP32-S2-Saola-1M | 4 MB (Quad) | - | `esp32s2-saola-1m`
| ESP32-S2-Saola-1MI | 4 MB (Quad) | - | `esp32s2-saola-1mi`
| ESP32-S2-Saola-1R | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-saola-1r`
| ESP32-S2-Saola-1RI | 4 MB (Quad) | 2 MB (Quad) | `esp32s2-saola-1ri`
</center>
<br>
@note
- If the board version is not specified, <b>ESP32-S2-DevKitM-1 with 4 MByte
Flash</b> is assumed and `BOARD_VERSION` is set to <b>`esp32s2-devkitm-1`</b>
by default.
- Using a board version with embedded SPI RAM (`BOARD_VERSION` is any of
<b>`esp32s2-*-1r*`</b> values) enables the
\ref esp32_spi_ram "esp_spi_ram" feature. The SPI RAM can then be used as
heap by enabling the \ref esp32_spi_ram "esp_spi_ram" pseudomodule.
[Back to table of contents](#esp32s2_devkit_toc)
## Hardware {#esp32s2_devkit_hardware}
This section describes
- the [MCU](#esp32s2_devkit_mcu),
- the default [board configuration](#esp32s2_devkit_board_configuration),
- [optional hardware configurations](#esp32s2_devkit_optional_hardware),
- the [board pinout](#esp32s2_devkit_pinout).
[Back to table of contents](#esp32s2_devkit_toc)
### MCU {#esp32s2_devkit_mcu}
Most features of the board are provided by the ESP32-S2 SoC. For detailed
information about the ESP32-S2 SoC variant (family) and ESP32x SoCs,
see section \ref esp32_mcu_esp32 "ESP32 SoC Series".
[Back to table of contents](#esp32s2_devkit_toc)
### Board Configuration {#esp32s2_devkit_board_configuration}
ESP32-S2-DevKit boards have no special hardware on board with the exception
of a single pin RGB-LED.
All GPIOs are simply broken out for flexibility. Therefore, the board
configuration is the most flexible one which provides:
- 20 x ADC channels at maximum
- 2 x SPI
- 1 x I2C
- 2 x UART
- 1 RGB-LED
Since almost GPIOs have broken out, GPIOs can be used for different purposes
in different applications. Following GPIOs are used for Flash and SPI RAM and
are not broken out:
- ESP32-S2-DevKitC-1x: GPIO27..GPIO32
- ESP32-S2-DevKitM-1x: GPIO26..GPIO32
- ESP32-S2-Saola-1x: GPIO26..GPIO32
For flexibility, GPIOs can be used in multiple peripheral configurations,
but they can only be used for one peripheral at a time. For example, GPIO9
is used in the ADC channel definition and the definition of the SCL signal
for I2C_DEV(0).
This is possible because GPIOs are only used for a specific peripheral
interface when either
- the corresponding peripheral module is used, e.g. `periph_i2c`, or
- the corresponding init function is called, e.g. `adc_init`.
That is, the purpose for which a GPIO is used depends on which module
or function is used first.
For example, if module `periph_i2c` is not used, the GPIOs listed in I2C
configuration can be used for the other purposes, that is, GPIO9 can be
used as ADC channel.
The following table shows the default board configuration, which is sorted
according to the defined functionality of GPIOs. This configuration can be
overridden by \ref esp32_application_specific_configurations
"application-specific configurations".
<center>
Function | GPIOs | Remarks | Configuration
:---------------|:-------|:--------|:----------------------------------
BUTTON0 | GPIO0 | | |
ADC_LINE(n) | GPIO1 ... GPIO10 | | \ref esp32_adc_channels "ADC Channels"
DAC_LINE(n) | GPIO17, GPIO18 | GPIO18 is connected to RGB-LED | \ref esp32_dac_channels "DAC Channels"
I2C_DEV(0) SCL | GPIO9 | | \ref esp32_i2c_interfaces "I2C Interfaces"
I2C_DEV(0) SDA | GPIO8 | | \ref esp32_i2c_interfaces "I2C Interfaces"
PWM_DEV(0) | GPIO11, GPIO12, GPIO13, GPIO14 | - | \ref esp32_pwm_channels "PWM Channels"
PWM_DEV(1) | GPIO15, GPIO16 | if module `esp_rtc_timer_32k` is not used | \ref esp32_pwm_channels "PWM Channels"
RGB-LED | GPIO18 | supported by driver module `ws281x` | |
SPI_DEV(0) CLK | GPIO12 | SPI2_HOST (FSPI) is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0) MISO | GPIO13 | SPI2_HOST (FSPI) is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0) MOSI | GPIO11 | SPI2_HOST (FSPI) is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0) CS0 | GPIO10 | SPI2_HOST (FSPI) is used | \ref esp32_spi_interfaces "SPI Interfaces"
UART_DEV(0) TxD | GPIO43 | Console (configuration is fixed) | \ref esp32_uart_interfaces "UART interfaces"
UART_DEV(0) RxD | GPIO44 | Console (configuration is fixed) | \ref esp32_uart_interfaces "UART interfaces"
</center>
\n
For detailed information about the peripheral configurations of ESP32-S2
boards, see section \ref esp32_peripherals "Common Peripherals".
[Back to table of contents](#esp32s2_devkit_toc)
### Board Pinout {#esp32s2_devkit_pinout}
The following figures show the pinouts as configured by default board
definition.
@image html https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/_images/esp32-s2-devkitm-1-v1-pin-layout.png "ESP32-S2-DevKitM-1x Pinout" width=900px
@image html https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/_images/esp32-s2-devkitc-1-v1-pinout.png "ESP32-S2-DevKitC-1x Pinout" width=900px
@image html https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/_images/esp32-s2_saola1-pinout.jpg "ESP32-S2-Saola-1x Pinout" width=900px
The corresponding board schematics can be found:
- [ESP32-S2-DevKitM-1x](https://dl.espressif.com/dl/schematics/ESP32-S2-DevKitM-1_V1_Schematics.pdf)
- [ESP32-S2-DevKitC-1x](https://dl.espressif.com/dl/schematics/SCH_ESP32-S2-DEVKITC-1_V1_20210508.pdf)
- [ESP32-S2-Saola-1x](https://dl.espressif.com/dl/schematics/ESP32-S2-SAOLA-1_V1.1_schematics.pdf)
[Back to table of contents](#esp32s2_devkit_toc)
## Flashing the Device {#esp32s2_devkit_flashing}
Flashing RIOT is quite easy. The board has a Micro-USB connector with
reset/boot/flash logic. Just connect the board to your host computer
and type using the programming port:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BOARD=esp32s2-devkit make flash ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For detailed information about ESP32-S2 as well as configuring and compiling
RIOT for ESP32-S2 boards, see \ref esp32_riot.
[Back to table of contents](#esp32s2_devkit_toc)
*/
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