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2.2.4
Application (or "Backchannel") UART
The backchannel UART allows communication with the USB host that is not part of the target application's
main functionality. This is very useful during development, and also provides a communication channel to
the PC host side. This can be used to create graphical user interfaces (GUIs) and other programs on the
PC that communicate with the LaunchPad development kit.
Figure 6
shows the pathway of the backchannel UART. The backchannel UART is the UART on
eUSCI_A1.
On the host side, a virtual COM port for the application backchannel UART is generated when the
LaunchPad development kit enumerates on the host. You can use any PC application that interfaces with
COM ports, including terminal applications like Hyperterminal or Docklight, to open this port and
communicate with the target application. You need to identify the COM port for the backchannel. On
Windows PCs, Device Manager can assist.
Figure 7. Application Backchannel UART in Device Manager
The backchannel UART is the "MSP Application UART1" port. In this case,
this port can vary from one host PC to the next. After you identify the correct COM port, configure it in
your host application according to its documentation. You can then open the port and begin
communication to it from the host.
On the target MSP430FR2355 side, the backchannel is connected to the eUSCI_A1 module. The eZ-FET
has a configurable baud rate; therefore, it is important that the PC application configures the baud rate to
be the same as what is configured on the eUSCI_A1.
2.2.5
Special Features
2.2.5.1
Smart Analog Combo (SAC)
The MSP430FR2355 MCU LaunchPad development kit features pins to access the SAC on the device.
These pins are accessed on jumpers J7, J8 and J9 where the SAC operational amplifier is connected to
the onboard photodiode circuit. These pins are also connected to the BoosterPack plug-in module header
pins. For applications that use the SAC and a connected BoosterPack plug-in module, be sure to check
for any pin conflicts. The photodiode circuit can be disconnected from the SAC using jumpers J7, J8 and
J9. The user can connect an external analog sensor circuit to the SAC by removing jumpers J7, J8 and J9
and connecting their circuit to the appropriate header pins through the BoosterPack plug-in module
headers or the jumpers near the light sensor circuit. To adjust the sensitivity of the light sensor circuit, the
user can adjust either the software or the hardware. By changing the values of R3 and C6, the user can
change the operational amplifier low-pass filter and sensitivity to the current of the photodiode. The user
can also adjust the calculations performed in the software to adjust the sensitivity of the circuit to their
desired level.
2.2.5.2
Grove Connector
The MSP430FR2355 MCU LaunchPad development kit features an onboard Grove connector for Analog
and Digital Grove modules from
3.3 V, GND, P1.1, and P1.4. Users can take advantage of this connector and begin prototyping with
different Grove sensors and actuators without the need to interface the LaunchPad development kit with a
Grove Base BoosterPack plug-in module.
SLAU680 – May 2018
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Seeed
Studio. The Grove connector consists of 4 pins that are routed to
MSP430FR2355 LaunchPad™ Development Kit (MSP ‑ EXP430FR2355)
Copyright © 2018, Texas Instruments Incorporated
Hardware
Figure 7
shows COM13, but
11
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