/*
 * Copyright (C) 2018 Gunar Schorcht
 * Copyright (C) 2020 Google LLC
 *
 * 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_esp32_esp-ethernet-kit-v1_1 v1.1 Board
 * @ingroup     boards_esp32_esp-ethernet-kit
 * @brief       Support for for Espressif ESP32-Ethernet-Kit v1.1
 * @author      Gunar Schorcht <gunar@schorcht.net>
 * @author      Erik Ekman <eekman@google.com>

## <a name="toc"> Table of Contents </a>

1. [Overview](#overview)
2. [Hardware](#hardware)
    1. [Board Configuration](#board_configuration)
    2. [Board Pinout](#pinout)
3. [Other Documentation Resources](#other-resources)

## <a name="overview"> Overview </a> &nbsp;&nbsp; [[TOC](#toc)]

The Espressif [ESP32-Ethernet-Kit](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-ethernet-kit-v1.1.html) is a development board that uses the ESP32-WROVER-B module. Most important features of the board are

- 100 Mbps Ethernet via IP101G PHY
- USB bridge with JTAG interface

Furthermore, some GPIOs are broken out for extension. The USB bridge based on FDI FT2232HL provides a JTAG interface for OCD debugging through the USB interface.
For flashing and debugging the board, see \ref boards_esp32_esp-ethernet-kit common board documentation.

## <a name="hardware"> Hardware </a> &nbsp;&nbsp; [[TOC](#toc)]

This section describes

- the default [board configuration](#board_configuration),
- the [board pinout](#pinout).

### <a name="board_configuration"> Board Configuration </a> &nbsp;&nbsp; [[TOC](#toc)]

ESP32-Ethernet-Kit v1.1 has the following on-board components

- 100 Mbps Ethernet via IP101G PHY
- USB bridge with JTAG interface

For detailed information about the configuration of ESP32 boards, see
section Peripherals in \ref esp32_riot.

@note
Only a few GPIOs are broken out and available for external hardware on ESP32-Ethernet-Kit boards. Which GPIOs are available as peripherals depends on used modules.

<center>
\anchor esp32_ethernet_kit_v1_1_table_board_configuration
Function        | GPIOs  | Remarks |Configuration
:---------------|:-------|:--------|:----------------------------------
BTN0            | GPIO0  | not available if `esp_eth` is used | |
ADC             | GPIO34, GPIO35, GPIO36, GPIO39 | | \ref esp32_adc_channels "ADC Channels"
DAC             | - | | \ref esp32_dac_channels "DAC Channels"
PWM_DEV(0)      | GPIO2, GPIO4 | | \ref esp32_pwm_channels "PWM Channels"
I2C_DEV(0):SDA  | GPIO32 | | \ref esp32_i2c_interfaces "I2C Interfaces"
I2C_DEV(0):SCL  | GPIO33 | | \ref esp32_i2c_interfaces "I2C Interfaces"
SPI_DEV(0):CLK  | GPIO14 | HSPI is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0):MISO | GPIO12 | HSPI is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0):MOSI | GPIO13 | HSPI is used | \ref esp32_spi_interfaces "SPI Interfaces"
SPI_DEV(0):CS0  | GPIO15  | HSPI is used | \ref esp32_spi_interfaces "SPI Interfaces"
UART_DEV(0):TxD | GPIO1  | Console (configuration is fixed) | \ref esp32_uart_interfaces "UART interfaces"
UART_DEV(0):RxD | GPIO3  | Console (configuration is fixed) | \ref esp32_uart_interfaces "UART interfaces"
</center>

@note
- SPI_DEV(0) is not available if module `esp_jtag` is used. For the SPI_DEV(0) pins to work properly, the function switches (DIP switches) for the JTAG signals must be set to OFF.

### <a name="pinout"> Board Pinout </a> &nbsp;&nbsp; [[TOC](#toc)]

The board schematic can be found [here](https://dl.espressif.com/dl/schematics/SCH_ESP32-ETHERNET-KIT_A_V1.1_20190711.pdf).

By default, only 4 bidirectional GPIO pins are unused: GPIO2, GPIO4, GPIO32, GPIO33. The suggested configuration is for PWM
and I2C, but they can also be used for SPI or another serial port. By disabling the JTAG interface on the board,
another 4 GPIOs can be made available (GPIO12, GPIO13, GPIO14, GPIO15).

## <a name="other-resources"> Other Documentation Resources </a> &nbsp;&nbsp; [[TOC](#toc)]

There is a comprehensive [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-ethernet-kit-v1.1.html) for the ESP32-Ethernet-Kit with a lot information about hardware configuration.
 */
