69 lines
1.9 KiB
Plaintext
Executable File
69 lines
1.9 KiB
Plaintext
Executable File
/*
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* Calculate the sum and average of a list of floating point numbers
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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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// object for the SD file system
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SdFat sd;
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// define a serial output stream
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ArduinoOutStream cout(Serial);
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//------------------------------------------------------------------------------
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void writeTestFile() {
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// open the output file
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ofstream sdout("AVG_TEST.TXT");
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// write a series of float numbers
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for (int16_t i = -1001; i < 2000; i += 13) {
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sdout << 0.1 * i << endl;
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}
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if (!sdout) sd.errorHalt("sdout failed");
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// file will be closed by destructor when sdout goes out of scope
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}
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//------------------------------------------------------------------------------
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void calcAverage() {
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uint16_t n = 0; // count of input numbers
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double num; // current input number
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double sum = 0; // sum of input numbers
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// open the input file
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ifstream sdin("AVG_TEST.TXT");
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// check for an open failure
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if (!sdin) sd.errorHalt("sdin failed");
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// read and sum the numbers
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while (sdin >> num) {
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n++;
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sum += num;
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}
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// print the results
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cout << "sum of " << n << " numbers = " << sum << endl;
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cout << "average = " << sum/n << endl;
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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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// pstr stores strings in flash to save RAM
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cout << pstr("Type any character to start\n");
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while (Serial.read() < 0) {}
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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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// write the test file
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writeTestFile();
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// read the test file and calculate the average
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calcAverage();
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}
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//------------------------------------------------------------------------------
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void loop() {}
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