UART Echo Low Latency Interrupt

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example demonstrate the UART low latency API and user managed interrupt service routine. This example receives 8 characters and echos back the same. The application ends when the user types 8 characters.

Initially the application sets a buffer to receive data and enables the RX interrupt. When RX ISR is triggered the ISR reads the data from UART FIFO and write to the RX buffer and sets the RX buffer count.

In the main context, the application checks if RX buffer has any data and if so reads the data from it and copy it to TX buffer and initiate the UART TX (echo).

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263x-cc, am263x-lp
Example folder	examples/drivers/uart/uart_echo_low_latency_interrupt

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
• Please select the UART port used for console as mentioned in Setup UART Terminal

See Also

UART

Sample Output

Shown below is a sample output when the application is run, Please note that application prints in both CCS and UART console. In UART console you need to type 8 characters.

CCS Console:

[UART] Echo Low Latency interrupt mode example started ...
All tests have passed!!

UART Console:

This is uart low latency test in interrupt mode, Receives 8 characters then echo's back and exits..
12345678
All tests have passed!!