81 lines
2.1 KiB
Plaintext
Executable File
81 lines
2.1 KiB
Plaintext
Executable File
/*
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* This example reads a simple CSV, comma-separated values, file.
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* Each line of the file has three values, a long and two floats.
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*/
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#include <SdFat.h>
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// SD chip select pin
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const uint8_t chipSelect = SS_PIN;
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// file system object
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SdFat sd;
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// create Serial stream
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ArduinoOutStream cout(Serial);
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char fileName[] = "3V_FILE.CSV";
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//------------------------------------------------------------------------------
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// store error strings in flash to save RAM
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#define error(s) sd.errorHalt_P(PSTR(s))
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//------------------------------------------------------------------------------
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// read and print CSV test file
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void readFile() {
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long lg;
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float f1, f2;
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char c1, c2;
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// open input file
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ifstream sdin(fileName);
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// check for open error
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if (!sdin.is_open()) error("open");
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// read until input fails
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while (sdin >> lg >> c1 >> f1 >> c2 >> f2) {
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// error in line if not commas
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if (c1 != ',' || c2 != ',') error("comma");
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// print in six character wide columns
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cout << setw(6) << lg << setw(6) << f1 << setw(6) << f2 << endl;
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}
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// Error in an input line if file is not at EOF.
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if (!sdin.eof()) error("readFile");
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}
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//------------------------------------------------------------------------------
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// write test file
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void writeFile() {
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// create or open and truncate output file
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ofstream sdout(fileName);
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// write file from string stored in flash
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sdout << pstr(
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"1,2.3,4.5\n"
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"6,7.8,9.0\n"
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"9,8.7,6.5\n"
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"-4,-3.2,-1\n") << flush;
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// check for any errors
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if (!sdout) error("writeFile");
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// file is closed by destructor when it goes out of scope.
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}
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//------------------------------------------------------------------------------
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void setup() {
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Serial.begin(9600);
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// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
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// breadboards. use SPI_FULL_SPEED for better performance
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if (!sd.init(SPI_HALF_SPEED, chipSelect)) sd.initErrorHalt();
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// create test file
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writeFile();
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// read and print test
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readFile();
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cout << "Done" << endl;
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}
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void loop() {}
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