============== ESP-WROVER-KIT ============== The `ESP-WROVER-KIT `_ is a development board for the ESP32 SoC from Espressif, based on a ESP32-WROVER-B module. .. list-table:: :align: center * - .. figure:: esp-wrover-kit-v4.1-layout-back.png :align: center ESP-WROVER-KIT board layout - front - .. figure:: esp-wrover-kit-v4.1-layout-front.png :align: center ESP-WROVER-KIT board layout - back Features ======== - ESP32-WROVER-B module - LCD screen - MicroSD card slot Its another distinguishing feature is the embedded FTDI FT2232HL chip, an advanced multi-interface USB bridge. This chip enables to use JTAG for direct debugging of ESP32 through the USB interface without a separate JTAG debugger. ESP-WROVER-KIT makes development convenient, easy, and cost-effective. Most of the ESP32 I/O pins are broken out to the board’s pin headers for easy access. Serial Console ============== UART0 is, by default, the serial console. It connects to the on-board FT2232HL converter and is available on the USB connector USB CON8 (J5). It will show up as /dev/ttyUSB[n] where [n] will probably be 1, since the first interface ([n] == 0) is dedicated to the USB-to-JTAG interface. Buttons and LEDs ================ Buttons ------- There are two buttons labeled Boot and EN. The EN button is not available to software. It pulls the chip enable line that doubles as a reset line. The BOOT button is connected to IO0. On reset it is used as a strapping pin to determine whether the chip boots normally or into the serial bootloader. After reset, however, the BOOT button can be used for software input. LEDs ---- There are several on-board LEDs for that indicate the presence of power and USB activity. There is an RGB LED available for software. Pin Mapping =========== ===== ========================= ========== Pin Signal Notes ===== ========================= ========== 0 RGB LED Red / BOOT Button 2 RGB LED Green 4 RGB LED Blue 5 LCD Backlight 18 LCD Reset 19 LCD Clock 21 LCD D/C 22 LCD CS 23 LCD MOSI 25 LCD MISO ===== ========================= ========== Configurations ============== nsh --- Basic NuttShell configuration (console enabled in UART0, exposed via USB connection by means of FT2232HL converter, at 115200 bps). wapi ---- Enables Wi-Fi support. gpio ---- This is a test for the GPIO driver. It includes the 3 LEDs and one, arbitrary, GPIO. For this example, GPIO22 was used. At the nsh, we can turn LEDs on and off with the following:: nsh> gpio -o 1 /dev/gpio0 nsh> gpio -o 0 /dev/gpio0 We can use the interrupt pin to send a signal when the interrupt fires:: nsh> gpio -w 14 /dev/gpio2 The pin is configured to as a rising edge interrupt, so after issuing the above command, connect it to 3.3V. spiflash -------- This config tests the external SPI that comes with an ESP32 module connected through SPI1. By default a SmartFS file system is selected. Once booted you can use the following commands to mount the file system:: mksmartfs /dev/smart0 mount -t smartfs /dev/smart0 /mnt Note that `mksmartfs` is only needed the first time. nx -- This config adds a set of tests using the graphic examples at `apps/example/nx`. This configuration illustrates the use of the LCD with the lower performance SPI interface. lvgl ---- This is a demonstration of the LVGL graphics library running on the NuttX LCD driver. You can find LVGL here:: https://www.lvgl.io/ https://github.com/lvgl/lvgl This configuration uses the LVGL demonstration at `apps/examples/lvgldemo`. External devices ================= BMP180 ------ When using BMP180 (enabling ``CONFIG_SENSORS_BMP180``), it's expected this device is wired to I2C0 bus.