Overview
========
The lpuart_hardware_flow_control Example project is to demonstrate usage of the hardware flow control function.
This example will send data to itself(loopback), and hardware flow control will be enabled in the example.
The CTS(clear-to-send) pin is for transmiter to check if receiver is ready, if the CTS pin is assert, transmiter start
to send data. The RTS(request-to-send) is a pin for receiver to inform the transmiter if receiver is ready to receive
data. So, please connect RTS to CTS pin directly.
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- Keil MDK 5.37
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Hardware requirements
=====================
- Mini/micro USB cable
- EVK-MIMXRT1020 board
- Personal Computer
Board settings
==============
This example will send data to itself(loopback),
and hardware flow control will be enabled in the example.
To make the example work, connections needed to be as follows:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Pin Name Board Location connect to Pin Name Board Location
RX J17-1 TX J17-2
RTS_B J19-1 CTS_B j17-8
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Prepare the Demo
================
1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. 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 demo runs successfully, the log would be seen on the OpenSDA terminal like:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is LPUART hardware flow control example on one board.
This example will send data to itself and will use hardware flow control to avoid the overflow.
Please make sure you make the correct line connection. Basically, the connection is:
LPUART_TX -- LPUART_RX
LPUART_RTS -- LPUART_CTS
Data matched! Transfer successfully.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Note:
To debug in qspiflash, following steps are needed:
1. Select the flash target and compile.
2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.
3. Start debugging in IDE.
- Keil: Click "Download (F8)" to program the image to qspiflash first then clicking "Start/Stop Debug Session (Ctrl+F5)" to start debugging.
