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120 lines
2.6 KiB
C++
120 lines
2.6 KiB
C++
/*
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* This example reads a simple CSV, comma-separated values, file.
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* Each line of the file has a label and three values, a long and two floats.
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*/
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#include <SPI.h>
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#include "SdFat.h"
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// SD chip select pin
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const uint8_t chipSelect = SS;
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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[] = "testfile.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(F(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 = 0;
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float f1, f2;
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char text[10];
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char c1, c2, c3; // space for commas.
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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()) {
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error("open");
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}
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// read until input fails
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while (1) {
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// Get text field.
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sdin.get(text, sizeof(text), ',');
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// Assume EOF if fail.
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if (sdin.fail()) {
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break;
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}
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// Get commas and numbers.
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sdin >> c1 >> lg >> c2 >> f1 >> c3 >> f2;
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// Skip CR/LF.
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sdin.skipWhite();
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if (sdin.fail()) {
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error("bad input");
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}
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// error in line if not commas
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if (c1 != ',' || c2 != ',' || c3 != ',') {
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error("comma");
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}
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// print in six character wide columns
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cout << text << 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()) {
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error("readFile");
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}
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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 << F(
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"Line 1,1,2.3,4.5\n"
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"Line 2,6,7.8,9.0\n"
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"Line 3,9,8.7,6.5\n"
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"Line 4,-4,-3.2,-1\n") << flush;
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// check for any errors
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if (!sdout) {
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error("writeFile");
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}
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sdout.close();
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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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// Wait for USB Serial
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while (!Serial) {
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SysCall::yield();
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}
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cout << F("Type any character to start\n");
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while (!Serial.available()) {
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SysCall::yield();
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}
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// Initialize at the highest speed supported by the board that is
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// not over 50 MHz. Try a lower speed if SPI errors occur.
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if (!sd.begin(chipSelect, SD_SCK_MHZ(50))) {
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sd.initErrorHalt();
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}
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// create test file
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writeFile();
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cout << endl;
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// read and print test
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readFile();
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cout << "\nDone!" << endl;
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}
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void loop() {} |