Msp430 Serial Code Example
MSP4340 LaunchPad - Simple UART Config and Echo Mar 27, 2016 By justin bauer The Universal asynchronous Receive/Transmit (UART) is a vital communication protocol that is relatively easy to setup and use. Note that this isn’t a limitation of the MSP430 UART interface itself. Rather the UART to USB converter chain is limited and won’t allow baudrates higher than 9600. If you need to transmit at higher baudrates to transfer data faster, you will need to connect the MSP430 through a USB to serial (UART) converter.
In this post I present a broken down version of the LaunchPad's example project which only contains the software UART transmit functionality. Note: the code I present can not receive any UART data. The next post will discuss how to use this code with from Spark Fun (which I just received in the mail) for faster communication. For this post you will need a terminal software. HyperTerminal which comes with Windows will do fine, but I don't like it very much. A Little About UART Basics What is UART?
Universal Asynchronous Receiver/Transmitter; UART is a communication protocol. As I already mentioned this post will only implement the transmitter part. Asynchronous means that the devices which are connected via UART do not need to be synchronized together (aka, share a clock signal).
This is very useful and this is the main benefit of using UART compared to other protocols such as or, the downside of this though is that you sacrifice speed when running asynchronously. The UART connection can be either be full duplex, which means the device can transmit and receive at the same time, or half duplex which means the uC can not send and receive as the same time. The serial port is one implementation of UART and RS-232 was (is) very common.
The problem with a serial port on a computer is that the voltages used to transmit the bits are waaaaaay out of the acceptable input range for a typical microcomputer. Why do they do this?
Salsa afro cuban montunos for piano cd raridade. They do this to make the transmission more resilient to noise and interference when transmitted over longer distances. If you are hooking your device into something like the image above (from Wikipedia), make sure you have level converters!
This is why I like to use USB chips like FTDI's, or the one built into the 5xx. Plus you can achieve faster speeds with those chips than you can with a typical RS-232 interface.
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Last bit of theory for UART. UARTs all have some basic properties which can be changed depending on the application. The main property which can be changed is Baud Rate, we will not discuss the others here since it is beyond the scope of this post. Baud Rate directly corresponds to how fast a bite will be transmitted. The larger the baud rate, the faster a byte is sent. Note: When sending a byte over UART your device needs to send 10 bits total, one start bit and one stop bit in addition to the 8 bit byte. The LaunchPad and Terminal Software The LaunchPad has the hardware built into the emulator to provide a very slow UART connection to the PC for debugging purposes.
It's maximum baud rate is 9600, which I have verified. The drivers that are (hopefully) automatically installed create a virtual COM port (VCP) which a terminal program or any computer application can access.
In my case it is COM9, if you don't know which one it is you can check the. If you want faster communication you have to use a seperate USB device. I typicaly have used FTDI chips and will be using an MSP330F5xx chip in the future. Sorry for all that rambling, here comes the code. Code is also posted. Sorry for the poor comments.