91 lines
2.4 KiB
Arduino
91 lines
2.4 KiB
Arduino
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/*
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* This sketch is a simple Print benchmark.
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*/
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#include <SdFat.h>
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#include <SdFatUtil.h>
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// SD chip select pin
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const uint8_t chipSelect = SS;
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// number of lines to print
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#define N_PRINT 20000
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#define PRINT_DOUBLE false
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// file system
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SdFat sd;
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// test file
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SdFile file;
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// Serial output stream
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ArduinoOutStream cout(Serial);
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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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void setup() {
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Serial.begin(9600);
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while (!Serial) {} // wait for Leonardo
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}
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//------------------------------------------------------------------------------
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void loop() {
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uint32_t maxLatency;
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uint32_t minLatency;
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uint32_t totalLatency;
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while (Serial.read() >= 0) {}
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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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delay(400); // catch Due reset problem
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cout << pstr("Free RAM: ") << FreeRam() << endl;
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// initialize the SD card at SPI_FULL_SPEED for best performance.
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// try SPI_HALF_SPEED if bus errors occur.
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if (!sd.begin(chipSelect, SPI_FULL_SPEED)) sd.initErrorHalt();
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cout << pstr("Type is FAT") << int(sd.vol()->fatType()) << endl;
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// open or create file - truncate existing file.
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if (!file.open("BENCH.TXT", O_CREAT | O_TRUNC | O_RDWR)) {
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error("open failed");
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}
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cout << pstr("Starting print test. Please wait.\n");
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// do write test
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maxLatency = 0;
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minLatency = 999999;
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totalLatency = 0;
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uint32_t t = millis();
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for (uint32_t i = 0; i < N_PRINT; i++) {
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uint32_t m = micros();
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#if PRINT_DOUBLE
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file.println((double)0.01*i);
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#else // PRINT_DOUBLE
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file.println(i);
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#endif // PRINT_DOUBLW
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if (file.writeError) {
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error("write failed");
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}
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m = micros() - m;
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if (maxLatency < m) maxLatency = m;
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if (minLatency > m) minLatency = m;
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totalLatency += m;
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}
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file.sync();
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t = millis() - t;
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double s = file.fileSize();
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cout << pstr("Time ") << 0.001*t << pstr(" sec\n");
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cout << pstr("File size ") << 0.001*s << pstr("KB\n");
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cout << pstr("Write ") << s/t << pstr(" KB/sec\n");
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cout << pstr("Maximum latency: ") << maxLatency;
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cout << pstr(" usec, Minimum Latency: ") << minLatency;
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cout << pstr(" usec, Avg Latency: ") << totalLatency/N_PRINT << pstr(" usec\n\n");
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file.close();
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cout << pstr("Done!\n\n");
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}
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