Instructions

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3.6.3 Operating the Example

When installation is complete, both COM ports are available. On a Windows PC, Device Manager runs

(see Figure 33) (see Section 3.7 for how to open Device Manager).

Figure 33. Device Manager After Both Ports are Enumerated

The UART backchannel's port name is "MSP Application UART1". The USB CDC interface for the

simpleUsbBackchannel application is "F5529LP simpleUsbBackchannel". The CDC interface's port only

appears when the simpleUsbBackchannel application is running, whereas the backchannel's port is

present anytime the F5529 LaunchPad is physically connected.

The COM port numbers associated with each are shown in the Device Manager. Open two instances of a

terminal application, like Hyperterminal or Docklight, and associate one with the backchannel and the

other with the CDC interface. Make sure that the terminal settings in each terminal application disable flow

control and have baud rate set to 28.8 kbps.

When both ports are open, enter data into one of the terminal applications. The data should appear in the

other terminal application. The same should work in reverse.

3.6.4 Backchannel UART Library: bcUart.c, bcUart.h

This example includes a simple library for the backchannel UART, which can be copied into any project to

use the backchannel. It can also be modified as needed. Copy bcUart.c and bcUart.h into the target

project, and include the bcUart.h file from any files that access it.

The library is preconfigured to use SMCLK as the clock source, and for the speed of SMCLK to be 8 MHz.

The baudrate is preconfigured for 28.8 kbps with no hardware flow control.

SMCLK is generally a good choice for the backchannel UART in a given application, but the clock speeds

may change. Instructions for this are located in bcUart.h.

SLAU533A–September 2013–Revised January 2014 MSP430F5529 LaunchPad™ Development Tool (MSP

‑

EXP430F5529LP)

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