95 lines
3.2 KiB
Plaintext
95 lines
3.2 KiB
Plaintext
README for the Espressif ESP Wrover Kit
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==============================================
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The ESP32 is a dual-core system from Espressif with two Harvard
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architecture Xtensa LX6 CPUs. All embedded memory, external memory and
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peripherals are located on the data bus and/or the instruction bus of
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these CPUs. With some minor exceptions, the address mapping of two CPUs
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is symmetric, meaning they use the same addresses to access the same
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memory. Multiple peripherals in the system can access embedded memory via
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DMA.
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ESP-WROVER-KIT is an ESP32-based development board produced by Espressif.
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ESP-WROVER-KIT features the following integrated components:
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ESP32-WROVER-B module
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LCD screen
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MicroSD card slot
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Its another distinguishing feature is the embedded FTDI FT2232HL chip,
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an advanced multi-interface USB bridge. This chip enables to use JTAG
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for direct debugging of ESP32 through the USB interface without a separate
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JTAG debugger. ESP-WROVER-KIT makes development convenient, easy, and
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cost-effective.
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Most of the ESP32 I/O pins are broken out to the board’s pin headers for easy access.
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Buttons and LEDs
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================
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Buttons
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-------
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There are two buttons labeled Boot and EN. The EN button is not available
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to software. It pulls the chip enable line that doubles as a reset line.
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The BOOT button is connected to IO0. On reset it is used as a strapping
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pin to determine whether the chip boots normally or into the serial
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bootloader. After reset, however, the BOOT button can be used for software
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input.
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LEDs
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----
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There are several on-board LEDs for that indicate the presence of power
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and USB activity.
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There is an RGB LED available for software.
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Configurations
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==============
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nsh
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---
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Basic configuration to run the NuttShell (nsh).
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wapi
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___
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This is a congiuration to test the Wifi driver using WAPI.
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The Wifi passphrase and SSID can be configured from menuconfig, then once
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booted you can check if an IP address was assigned:
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nsh> ifconfig
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If not configured at startup, you can connect to a network with the following:
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wapi psk wlan0 mypassword 1
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wapi essid wlan0 myssid 1
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gpio
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---
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This is a test for the GPIO driver. It includes the 3 LEDs and one,
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arbitrary, GPIO. For this example, GPIO22 was used.
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At the nsh, we can turn LEDs on and off with the following.
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nsh> gpio -o 1 /dev/gpout0
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nsh> gpio -o 0 /dev/gpout1
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We can use the interrupt pin to send a signal when the interrupt fires:
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nsh> gpio -w 14 /dev/gpint3
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The pin is configured to as a rising edge interrupt, so after issuing the
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above command, connect it to 3.3V.
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Using QEMU:
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==========
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First follow the instructions at https://github.com/espressif/qemu/wiki to build QEMU.
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Enable the ESP32_QEMU_IMAGE config found in "Board Selection -> ESP32 binary image for QEMU".
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Download the bootloader and the partition table from https://github.com/espressif/esp-nuttx-bootloader/releases
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and place them in a directory, say ../esp-bins.
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Build and generate the QEMU image: `make ESPTOOL_BINDIR=../esp-bins`
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A new image "esp32_qemu_image.bin" will be created. It can be run as:
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~/PATH_TO_QEMU/qemu/build/xtensa-softmmu/qemu-system-xtensa -nographic \
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-machine esp32 \
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-drive file=esp32_qemu_image.bin,if=mtd,format=raw
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