前提・実現したいことarduinoは初心者です。質問させてください。 arduinoと別のマイコン間で、簡単な調歩同期式の通信がしたいです。 arduino側から、よくある形式の<stx>~~~<etx><sum><CR>のデータを送信して、マイコンから同じ形式のものを受信したいです.
Description
Read Serial Input Basics; example three is tailored to your needs; just replace the start- and the endmarker with the STX and ETX. Parsing is usually simple but we don't know what you exactly receive and what you exactly want to come out. The BCC is obtained by first ignoring the STX, BCC and ETX codes from the string and summing the remaining hexadecimal ASCII codes (aside from the STX, BCC and ETX characters, the code is 12 characters long). Next, take the 2’s complement of the result. Finally, the least significant byte of the 2’s complement is used as the BCC.
The communication starts with a start-of-communication (STX) byte (ASCII 02) and ends with end-of-communication (ETX) byte (ASCII 03). The STX byte is immediately followed by the ten-byte tag ID (unique signature), a checksum, a carriage return (ASCII 13), a linefeed (ASCII 10) and then the ETX byte. ID-12 ID12 Pin Setup. Now the Arduino code is complete. You can upload this code to your Arduino and check the output using the Serial Monitor. Our next step is to write the Java Program that will read from the Arduino and display that data in a chart. I will get the help of the tutorials on Java RxTx for Serial Communication and JFree Chart tutorial to do this.
Prints data to the serial port as human-readable ASCII text. This command can take many forms. Numbers are printed using an ASCII character for each digit. Floats are similarly printed as ASCII digits, defaulting to two decimal places. Bytes are sent as a single character. Characters and strings are sent as is. For example-
Serial.print(78)
gives '78'Serial.print(1.23456)
gives '1.23'Serial.print('N')
gives 'N'Serial.print('Hello world.')
gives 'Hello world.'
An optional second parameter specifies the base (format) to use; permitted values are
BIN(binary, or base 2)
, OCT(octal, or base 8)
, DEC(decimal, or base 10)
, HEX(hexadecimal, or base 16)
. For floating point numbers, this parameter specifies the number of decimal places to use. For example-Serial.print(78, BIN)
gives '1001110'Serial.print(78, OCT)
gives '116'Serial.print(78, DEC)
gives '78'Serial.print(78, HEX)
gives '4E'Serial.print(1.23456, 0)
gives '1'Serial.print(1.23456, 2)
gives '1.23'Serial.print(1.23456, 4)
gives '1.2345'
You can pass flash-memory based strings to
Serial.print()
by wrapping them with F(). For example:To send data without conversion to its representation as characters, use Serial.write().
Syntax
Parameters
Stx Etx Protocol
Serial
: serial port object. See the list of available serial ports for each board on the Serial main page.val
: the value to print. Allowed data types: any data type.Returns
Arduino Serial Stx Etx 2
print()
returns the number of bytes written, though reading that number is optional. Data type: size_t
.