uart_edma_rb_transfer#
Overview#
The uart_edma ring buffer example shows how to use uart driver with EDMA:
In this example, one uart instance connect to PC through uart, the board will send back all characters that PC send to the board. And data from PC will be firstly stored to a ring buffer using EDMA methord, and than application will read the ring buffer in a certain time, such as 10ms. While data has already be stored in the ring buffer, routine will send them back.
And the ring buffer is achieved based on the DMA’s source address modulo feature, the base address should be aligned to a 0-modulo-boundary.
Supported Boards#
FRDM-KE17Z512
Hardware requirements
Micro USB cable
FRDM-KE17Z512 board
Personal Computer
USB to Com converter
Board settings
J4-10 connect to TxD of the USB to Com converter. J4-12 connect to RxD of the USB to Com converter. J3-14 connect to GND of the USB to Com converter
Prepare the Demo
Connect a USB cable between the host PC and the MCU-LINK USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
UART EDMA example
Send back received data
Echo every 8 characters