Whadda WPI304N, Руководство пользователя

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85. // print the buffer length. This will change depending on when
86. // data is actually written to the SD card file:
87. Serial . print ( "Unsaved data buffer length (in bytes): " ) ;
88. Serial . println ( buffer. length ()) ;
89. // note the time that the last line was added to the string
90. lastMillis = now ;
91. }
92.
93. // check if the SD card is available to write data without blocking
94. // and if the buffered data is enough for the full chunk size
95. unsigned int chunkSize = txtFile. availableForWrite () ;
96. if ( chunkSize && buffer. length () >= chunkSize ) {
97. // write to file and blink LED
98. digitalWrite ( LED_BUILTIN , HIGH ) ;
99. txtFile. write ( buffer. c_str () , chunkSize ) ;
100. digitalWrite ( LED_BUILTIN , LOW ) ;
101.
102. // remove written data from buffer
103. buffer. remove ( 0 , chunkSize ) ;
104. }
105. }