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88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
// Demo of fgets function to read lines from a file.
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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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SdFat sd;
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// print stream
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ArduinoOutStream cout(Serial);
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//------------------------------------------------------------------------------
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// store error strings in flash memory
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#define error(s) sd.errorHalt(F(s))
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//------------------------------------------------------------------------------
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void demoFgets() {
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char line[25];
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int n;
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// open test file
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SdFile rdfile("fgets.txt", O_READ);
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// check for open error
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if (!rdfile.isOpen()) {
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error("demoFgets");
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}
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cout << endl << F(
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"Lines with '>' end with a '\\n' character\n"
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"Lines with '#' do not end with a '\\n' character\n"
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"\n");
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// read lines from the file
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while ((n = rdfile.fgets(line, sizeof(line))) > 0) {
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if (line[n - 1] == '\n') {
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cout << '>' << line;
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} else {
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cout << '#' << line << endl;
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}
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}
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}
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//------------------------------------------------------------------------------
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void makeTestFile() {
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// create or open test file
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SdFile wrfile("fgets.txt", O_WRITE | O_CREAT | O_TRUNC);
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// check for open error
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if (!wrfile.isOpen()) {
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error("MakeTestFile");
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}
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// write test file
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wrfile.print(F(
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"Line with CRLF\r\n"
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"Line with only LF\n"
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"Long line that will require an extra read\n"
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"\n" // empty line
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"Line at EOF without NL"
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));
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wrfile.close();
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}
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//------------------------------------------------------------------------------
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void setup(void) {
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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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delay(400); // catch Due reset problem
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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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makeTestFile();
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demoFgets();
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cout << F("\nDone\n");
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}
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void loop(void) {}
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