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244 lines
12 KiB
ReStructuredText
ESP32-PICO-KIT V4 / V4.1 Getting Started Guide
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==============================================
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:link_to_translation:`zh_CN:[中文]`
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This guide shows how to get started with the ESP32-PICO-KIT V4/V4.1 mini development board. For the description of other ESP32-PICO-KIT versions, please check :doc:`../../hw-reference/index`.
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This particular description covers ESP32-PICO-KIT V4 and V4.1. The difference is the upgraded USB-UART bridge from CP2102 in V4 with up to 1 Mbps transfer rates to CP2102N in V4.1 with up to 3 Mbps transfer rates.
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What You Need
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-------------
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* :ref:`ESP32-PICO-KIT mini development board <get-started-pico-kit-v4-board-front>`
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* USB 2.0 A to Micro B cable
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* Computer running Windows, Linux, or macOS
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You can skip the introduction sections and go directly to Section `Start Application Development`_.
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Overview
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--------
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ESP32-PICO-KIT is an ESP32-based mini development board produced by `Espressif <https://espressif.com>`_.
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The core of this board is ESP32-PICO-D4 - a System-in-Package (SiP) module with complete Wi-Fi and Bluetooth functionalities. Compared to other ESP32 modules, ESP32-PICO-D4 integrates the following peripheral components in one single package, which otherwise would need to be installed separately:
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- 40 MHz crystal oscillator
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- 4 MB flash
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- Filter capacitors
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- RF matching links
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This setup reduces the costs of additional external components as well as the cost of assembly and testing and also increases the overall usability of the product.
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The development board features a USB-UART Bridge circuit which allows developers to connect the board to a computer's USB port for flashing and debugging.
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All the IO signals and system power on ESP32-PICO-D4 are led out to two rows of 20 x 0.1" header pads on both sides of the development board for easy access. For compatibility with Dupont wires, 2 x 17 header pads are populated with two rows of male pin headers. The remaining 2 x 3 header pads beside the antenna are not populated. These pads may be populated later by the user if required.
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.. note::
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1. There are two versions of ESP32-PICO-KIT boards, respectively with male headers and female headers. In this guide, the male header version is taken as an example.
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2. The 2 x 3 pads not populated with pin headers are connected to the flash memory embedded in the ESP32-PICO-D4 SiP module. For more details, see module's datasheet in `Related Documents`_.
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Functionality Overview
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----------------------
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The block diagram below shows the main components of ESP32-PICO-KIT and their interconnections.
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.. figure:: ../../../_static/esp32-pico-kit-v4-functional-block-diagram.png
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:align: center
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:alt: ESP32-PICO-KIT functional block diagram
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:figclass: align-center
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ESP32-PICO-KIT block diagram
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Functional Description
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----------------------
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The following figure and the table below describe the key components, interfaces, and controls of the ESP32-PICO-KIT board.
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.. _get-started-pico-kit-v4-board-front:
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.. figure:: ../../../_static/esp32-pico-kit-v4.1-f-layout.jpeg
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:align: center
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:alt: ESP32-PICO-KIT board layout (with female headers)
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:figclass: align-center
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ESP32-PICO-KIT board layout (with female headers)
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Below is the description of the items identified in the figure starting from the top left corner and going clockwise.
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.. list-table::
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:widths: 25 75
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:header-rows: 1
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* - Key Component
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- Description
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* - ESP32-PICO-D4
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- Standard ESP32-PICO-D4 module soldered to the ESP32-PICO-KIT board. The complete ESP32 system on a chip (ESP32 SoC) has been integrated into the SiP module, requiring only an external antenna with LC matching network, decoupling capacitors, and a pull-up resistor for EN signals to function properly.
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* - LDO
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- 5V-to-3.3V Low dropout voltage regulator (LDO).
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* - USB-UART bridge
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- Single-chip USB-UART bridge: CP2102 in V4 provides up to 1 Mbps transfer rates and CP2102N in V4.1 offers up to 3 Mbps transfers rates.
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* - Micro USB Port
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- USB interface. Power supply for the board as well as the communication interface between a computer and the board.
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* - 5V Power On LED
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- This red LED turns on when power is supplied to the board. For details, see the schematics in `Related Documents`_.
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* - I/O
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- All the pins on ESP32-PICO-D4 are broken out to pin headers. You can program ESP32 to enable multiple functions, such as PWM, ADC, DAC, I2C, I2S, SPI, etc. For details, please see Section `Pin Descriptions`_.
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* - BOOT Button
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- Download button. Holding down **Boot** and then pressing **EN** initiates Firmware Download mode for downloading firmware through the serial port.
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* - EN Button
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- Reset button.
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Power Supply Options
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--------------------
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There are three mutually exclusive ways to provide power to the board:
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* Micro USB port, default power supply
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* 5V / GND header pins
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* 3V3 / GND header pins
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.. warning::
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The power supply must be provided using **one and only one of the options above**, otherwise the board and/or the power supply source can be damaged.
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Pin Descriptions
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----------------
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The two tables below provide the **Name** and **Function** of I/O header pins on both sides of the board, see :ref:`get-started-pico-kit-v4-board-front`. The pin numbering and header names are the same as in the schematic given in `Related Documents`_.
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Header J2
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"""""""""
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====== ================= ====== ======================================================
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No. Name Type Function
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====== ================= ====== ======================================================
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1 FLASH_SD1 (FSD1) I/O | GPIO8, SD_DATA1, SPID, HS1_DATA1 :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U2CTS
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2 FLASH_SD3 (FSD3) I/O | GPIO7, SD_DATA0, SPIQ, HS1_DATA0 :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U2RTS
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3 FLASH_CLK (FCLK) I/O | GPIO6, SD_CLK, SPICLK, HS1_CLK :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U1CTS
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4 IO21 I/O | GPIO21, VSPIHD, EMAC_TX_EN
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5 IO22 I/O | GPIO22, VSPIWP, U0RTS, EMAC_TXD1
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6 IO19 I/O | GPIO19, VSPIQ, U0CTS, EMAC_TXD0
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7 IO23 I/O | GPIO23, VSPID, HS1_STROBE
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8 IO18 I/O | GPIO18, VSPICLK, HS1_DATA7
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9 IO5 I/O | GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK
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10 IO10 I/O | GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD
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11 IO9 I/O | GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD
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12 RXD0 I/O | GPIO3, U0RXD :ref:`(See 3) <get-started-pico-kit-v4-pin-notes>` , CLK_OUT2
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13 TXD0 I/O | GPIO1, U0TXD :ref:`(See 3) <get-started-pico-kit-v4-pin-notes>` , CLK_OUT3, EMAC_RXD2
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14 IO35 I | ADC1_CH7, RTC_GPIO5
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15 IO34 I | ADC1_CH6, RTC_GPIO4
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16 IO38 I | GPIO38, ADC1_CH2, RTC_GPIO2
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17 IO37 I | GPIO37, ADC1_CH1, RTC_GPIO1
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18 EN I | CHIP_PU
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19 GND P | Ground
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20 VDD33 (3V3) P | 3.3V power supply
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====== ================= ====== ======================================================
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Header J3
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"""""""""
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====== ================= ====== ======================================================
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No. Name Type Function
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====== ================= ====== ======================================================
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1 FLASH_CS (FCS) I/O | GPIO16, HS1_DATA4 :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U2RXD, EMAC_CLK_OUT
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2 FLASH_SD0 (FSD0) I/O | GPIO17, HS1_DATA5 :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U2TXD, EMAC_CLK_OUT_180
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3 FLASH_SD2 (FSD2) I/O | GPIO11, SD_CMD, SPICS0, HS1_CMD :ref:`(See 1) <get-started-pico-kit-v4-pin-notes>` , U1RTS
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4 SENSOR_VP (FSVP) I | GPIO36, ADC1_CH0, RTC_GPIO0
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5 SENSOR_VN (FSVN) I | GPIO39, ADC1_CH3, RTC_GPIO3
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6 IO25 I/O | GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
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7 IO26 I/O | GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
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8 IO32 I/O | 32K_XP :ref:`(See 2a) <get-started-pico-kit-v4-pin-notes>` , ADC1_CH4, TOUCH9, RTC_GPIO9
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9 IO33 I/O | 32K_XN :ref:`(See 2b) <get-started-pico-kit-v4-pin-notes>` , ADC1_CH5, TOUCH8, RTC_GPIO8
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10 IO27 I/O | GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17
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| EMAC_RX_DV
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11 IO14 I/O | ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK,
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| HS2_CLK, SD_CLK, EMAC_TXD2
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12 IO12 I/O | ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI :ref:`(See 4) <get-started-pico-kit-v4-pin-notes>` , HSPIQ,
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| HS2_DATA2, SD_DATA2, EMAC_TXD3
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13 IO13 I/O | ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID,
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| HS2_DATA3, SD_DATA3, EMAC_RX_ER
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14 IO15 I/O | ADC2_CH3, TOUCH3, RTC_GPIO13, MTDO, HSPICS0
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| HS2_CMD, SD_CMD, EMAC_RXD3
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15 IO2 I/O | ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP,
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| HS2_DATA0, SD_DATA0
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16 IO4 I/O | ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD,
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| HS2_DATA1, SD_DATA1, EMAC_TX_ER
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17 IO0 I/O | ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1
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| EMAC_TX_CLK
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18 VDD33 (3V3) P | 3.3V power supply
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19 GND P | Ground
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20 EXT_5V (5V) P | 5V power supply
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====== ================= ====== ======================================================
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.. _get-started-pico-kit-v4-pin-notes:
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.. note::
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1. This pin is connected to the flash pin of ESP32-PICO-D4.
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2. 32.768 kHz crystal oscillator: a) input, b) output.
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3. This pin is connected to the pin of the USB bridge chip on the board.
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4. The operating voltage of ESP32-PICO-KIT’s embedded SPI flash is 3.3 V. Therefore, the strapping pin MTDI should hold bit zero during the module power-on reset. If connected, please make sure that this pin is not held up on reset.
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Pin Layout
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^^^^^^^^^^^
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.. figure:: ../../../_static/esp32-pico-kit-v4-pinout.png
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:align: center
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:scale: 43%
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:alt: ESP32-PICO-KIT (click to enlarge)
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ESP32-PICO-KIT Pin Layout (click to enlarge)
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Start Application Development
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-----------------------------
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Before powering up your ESP32-PICO-KIT, please make sure that the board is in good condition with no obvious signs of damage.
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After that, proceed to :doc:`../../get-started/index`, where Section :ref:`get-started-step-by-step` will quickly help you set up the development environment and then flash an example project onto your board.
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Board Dimensions
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----------------
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The dimensions are 52 x 20.3 x 10 mm (2.1" x 0.8" x 0.4").
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.. figure:: ../../../_static/esp32-pico-kit-v4.1-dimensions-back.jpg
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:align: center
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:alt: ESP32-PICO-KIT dimensions - back (with male headers)
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:figclass: align-center
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ESP32-PICO-KIT dimensions - back (with male headers)
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.. figure:: ../../../_static/esp32-pico-kit-v4-dimensions-side.jpg
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:align: center
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:alt: ESP32-PICO-KIT V4 dimensions - side (with male headers)
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:figclass: align-center
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ESP32-PICO-KIT dimensions - side (with male headers)
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For the board physical construction details, please refer to its Reference Design listed below.
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Related Documents
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-----------------
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* `ESP32-PICO-KIT V4 schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4_schematic.pdf>`_ (PDF)
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* `ESP32-PICO-KIT V4.1 schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4.1_schematic.pdf>`_ (PDF)
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* `ESP32-PICO-KIT Reference Design <https://www.espressif.com/sites/default/files/documentation/esp32-pico-kit_v4.1_20180314_en.zip>`_ containing OrCAD schematic, PCB layout, gerbers and BOM
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* `ESP32-PICO-D4 Datasheet <https://espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf>`_ (PDF)
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* :doc:`../../hw-reference/index`
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.. toctree::
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:hidden:
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get-started-pico-kit-v3
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