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6e449d7f5b
Defaulting to CS pin 4 (for Arduino Ethernet Shield). Holding the SS pin high (for disabling W5100 on the Ethernet Shield).
105 lines
2.5 KiB
Plaintext
Executable File
105 lines
2.5 KiB
Plaintext
Executable File
/*
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* This sketch is a simple write/read benchmark.
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*/
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#include <SdFat.h>
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#include <SdFatUtil.h>
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#define FILE_SIZE_MB 5
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#define FILE_SIZE (1000000UL*FILE_SIZE_MB)
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#define BUF_SIZE 100
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uint8_t buf[BUF_SIZE];
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Sd2Card card;
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SdVolume volume;
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SdFile root;
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SdFile file;
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// store error strings in flash to save RAM
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#define error(s) error_P(PSTR(s))
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void error_P(const char* str)
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{
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PgmPrint("error: ");
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SerialPrintln_P(str);
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if (card.errorCode()) {
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PgmPrint("SD error: ");
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Serial.print(card.errorCode(), HEX);
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Serial.print(',');
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Serial.println(card.errorData(), HEX);
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}
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while(1);
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}
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void setup() {
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Serial.begin(9600);
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PgmPrintln("Type any character to start");
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while (!Serial.available());
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PgmPrint("Free RAM: ");
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Serial.println(FreeRam());
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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 (!card.init(SPI_FULL_SPEED)) error("card.init failed");
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// initialize a FAT volume
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if (!volume.init(&card)) error("volume.init failed!");
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PgmPrint("Type is FAT");
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Serial.println(volume.fatType(), DEC);
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if (!root.openRoot(&volume)) error("openRoot failed");
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// open or create file - truncate existing file.
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if (!file.open(&root, "BENCH.DAT", O_CREAT | O_TRUNC | O_RDWR)) {
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error("open failed");
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}
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// fill buf with known data
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for (uint16_t i = 0; i < (BUF_SIZE-2); i++) {
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buf[i] = 'A' + (i % 26);
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}
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buf[BUF_SIZE-2] = '\r';
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buf[BUF_SIZE-1] = '\n';
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PgmPrint("File size ");
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Serial.print(FILE_SIZE_MB);
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PgmPrintln(" MB");
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PgmPrintln("Starting write test. Please wait up to a minute");
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// do write test
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uint32_t n = FILE_SIZE/sizeof(buf);
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uint32_t t = millis();
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for (uint32_t i = 0; i < n; i++) {
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if (file.write(buf, sizeof(buf)) != sizeof(buf)) {
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error("write failed");
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}
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}
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t = millis() - t;
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file.sync();
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double r = (double)file.fileSize()/t;
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PgmPrint("Write ");
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Serial.print(r);
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PgmPrintln(" KB/sec");
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Serial.println();
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PgmPrintln("Starting read test. Please wait up to a minute");
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// do read test
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file.rewind();
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t = millis();
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for (uint32_t i = 0; i < n; i++) {
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if (file.read(buf, sizeof(buf)) != sizeof(buf)) {
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error("read failed");
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}
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}
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t = millis() - t;
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r = (double)file.fileSize()/t;
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PgmPrint("Read ");
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Serial.print(r);
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PgmPrintln(" KB/sec");
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PgmPrintln("Done");
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}
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void loop() { }
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