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README.md
Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
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UART Asynchronous Example with Separate Receive and Transfer Tasks
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This example demonstrates how two asynchronous tasks can use the same UART interface for communication. One can use this example to develop more complex applications for serial communication.
The example starts two FreeRTOS tasks:
- The first task periodically transmits
Hello world
via the UART. - The second task task listens, receives and prints data from the UART.
How to use example
Hardware Required
The example can be run on any commonly available development board, that is based on the Espressif SoC. You will need a USB cable to connect the development board to a computer, and a simple one-wire cable for shorting two pins of the board.
Setup the Hardware
The RXD_PIN
and TXD_PIN
which are configurable in the code (by default GPIO4
and GPIO5
) need to be shorted in
order to receive back the same data which were sent out.
Configure the project
idf.py menuconfig
Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
idf.py -p PORT flash monitor
(To exit the serial monitor, type Ctrl-]
.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
Example Output
You will receive the following repeating output from the monitoring console:
...
I (3261) TX_TASK: Wrote 11 bytes
I (4261) RX_TASK: Read 11 bytes: 'Hello world'
I (4261) RX_TASK: 0x3ffb821c 48 65 6c 6c 6f 20 77 6f 72 6c 64 |Hello world|
...
Troubleshooting
If you do not see any output from RX_TASK
then check if you have the RXD_PIN
and TXD_PIN
pins shorted on the board.