Digilent Pmod ESP32 Referentiehandleiding - Pagina 5

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AT Command (Slave) Mode

The Pmod ESP32 is delivered to users in slave mode. In slave mode, the top row of

pins are mapped to their UART functionality. It is important that switches SW1.1 and

SW1.2 are both in the "off" position when power is applied to the device. Once power

has been applied, the value of SW1.2 is arbitrary. However, SW1.1 must remain in the

"off" position during the duration of operation in slave mode.

In slave mode, commands of a specific format (referred to as AT commands hereafter)

are passed to the Pmod via the UART port on the top row of pins. The UART port on

the Pmod is initially set to function at 115200 baud with 8 data bits, 1 stop bit, and no

parity or hardware flow control. The settings of the UART port can be modified by using

specific AT commands later.

AT commands must always be followed by a carriage return and newline character, in

that order. For example, the AT command "AT" would be typed into the serial terminal

as "AT<CR><LF>", where CR stands for carriage return and LF stands for line feed or

newline. If the carriage return or line feed are not included at the end of the command,

the Pmod will not respond to the command. The Pmod is initially set to echo back any

UART data it receives to the sender. Upon boot, when in slave mode, the Pmod will

send the word "ready" over the UART port.

A very sparse table of some AT commands is shown below. For the full list of supported

AT commands, please visit the official AT Command Set documentation, which is

provided by Espressif.

Carriage return and line feed bytes are omitted for clarity.

Command

Behavior

Verifies that

the device is

in AT mode

and working

AT+RST

Resets the

device

AT+GMR

Checks

version info

Example

AT+RST

AT+GMR

Response

<At Version Info>, <SDK version info>,