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Jar Design A320 Serial Code
Activate your plugin and the various planes and systems will start to “break”. Turn the plane’s radio on and you will see the planes A, B and C acknowledge the callsign you give them. One note before activating the plugin. Make sure, the baud rate is set correctly, because the plugin deals with this in the decode function. The following video shows, how the a320 decodes the call sign. Of course, the correct baud rate is 9600.
Once you have determined how much data there is in your character, you need to convert it into something your board can understand. In the case of the code in this book, that data is a single character. But in a real world application, a data stream with all sorts of characters is often sent. These characters can come from a serial port that the transmitter is using to send data. A hardware UART (Universal Asynchronous Receiver/Transmitter) is used to turn the serial port into a protocol that the hardware on the board can understand.
In the code for this book, you have already received the proper characters. You have to convert them into numbers (1 through 9) and place that into a character array. The purpose of this is to make the data easier for the processor to interpret. For example, if a character were 1010, it would become an array (10,0,1,1,0), and the character would appear on the input pin as the text 1011. A protocol such as this can make it easier for the transmitter to send data.
When the transmitter sends data out, it is important to make sure that you are actually sampling the proper data. The RX pin on the Arduino is connected to an input buffer on the input pin, and the TX pin is connected to an output buffer on an output pin. The input buffer buffers any data that comes in while the output buffer is sending data out. This enables your Arduino to send data while it is receiving new data. The Arduino IDE monitors the amount of data coming in on the RX pin and triggers a “receive completed” event when it gets a good chunk of data. However, while data is being received, it can send a “receive not completed” event if the data coming in isn’t good enough to trigger a completed event. There is a risk that this will lead to your code either not receiving any data at all or receiving all data together. In our case, if the data that the transmitter is sending to the board is, for example, 1 byte of data, and you are receiving only 1 byte, there is a strong risk that you won’t see any of the data in your array. For this reason, there is a “receive not completed” event. But if you get a “receive not completed” event while you are sending data, it doesn’t mean the transmitter is having a bad connection.