122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/*
|
|
* This sketch is a simple binary write/read benchmark.
|
|
*/
|
|
#include <SdFat.h>
|
|
#include <SdFatUtil.h>
|
|
|
|
// SD chip select pin
|
|
const uint8_t chipSelect = SS;
|
|
|
|
#define FILE_SIZE_MB 5
|
|
#define FILE_SIZE (1000000UL*FILE_SIZE_MB)
|
|
#define BUF_SIZE 100
|
|
|
|
uint8_t buf[BUF_SIZE];
|
|
|
|
// file system
|
|
SdFat sd;
|
|
|
|
// test file
|
|
SdFile file;
|
|
|
|
// Serial output stream
|
|
ArduinoOutStream cout(Serial);
|
|
//------------------------------------------------------------------------------
|
|
// store error strings in flash to save RAM
|
|
#define error(s) sd.errorHalt_P(PSTR(s))
|
|
//------------------------------------------------------------------------------
|
|
void setup() {
|
|
Serial.begin(9600);
|
|
while (!Serial){} // wait for Leonardo
|
|
Serial.println();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
void loop() {
|
|
uint32_t maxLatency;
|
|
uint32_t minLatency;
|
|
uint32_t totalLatency;
|
|
|
|
// discard any input
|
|
while (Serial.read() >= 0) {}
|
|
|
|
// pstr stores strings in flash to save RAM
|
|
cout << pstr("Type any character to start\n");
|
|
while (Serial.read() <= 0) {}
|
|
delay(400); // catch Due reset problem
|
|
|
|
cout << pstr("Free RAM: ") << FreeRam() << endl;
|
|
|
|
// initialize the SD card at SPI_FULL_SPEED for best performance.
|
|
// try SPI_HALF_SPEED if bus errors occur.
|
|
if (!sd.begin(chipSelect, SPI_FULL_SPEED)) sd.initErrorHalt();
|
|
|
|
cout << pstr("Type is FAT") << int(sd.vol()->fatType()) << endl;
|
|
|
|
// open or create file - truncate existing file.
|
|
if (!file.open("BENCH.DAT", O_CREAT | O_TRUNC | O_RDWR)) {
|
|
error("open failed");
|
|
}
|
|
|
|
// fill buf with known data
|
|
for (uint16_t i = 0; i < (BUF_SIZE-2); i++) {
|
|
buf[i] = 'A' + (i % 26);
|
|
}
|
|
buf[BUF_SIZE-2] = '\r';
|
|
buf[BUF_SIZE-1] = '\n';
|
|
|
|
cout << pstr("File size ") << FILE_SIZE_MB << pstr("MB\n");
|
|
cout << pstr("Buffer size ") << BUF_SIZE << pstr(" bytes\n");
|
|
cout << pstr("Starting write test. Please wait up to a minute\n");
|
|
|
|
// do write test
|
|
uint32_t n = FILE_SIZE/sizeof(buf);
|
|
maxLatency = 0;
|
|
minLatency = 9999999;
|
|
totalLatency = 0;
|
|
uint32_t t = millis();
|
|
for (uint32_t i = 0; i < n; i++) {
|
|
uint32_t m = micros();
|
|
if (file.write(buf, sizeof(buf)) != sizeof(buf)) {
|
|
error("write failed");
|
|
}
|
|
m = micros() - m;
|
|
if (maxLatency < m) maxLatency = m;
|
|
if (minLatency > m) minLatency = m;
|
|
totalLatency += m;
|
|
}
|
|
file.sync();
|
|
t = millis() - t;
|
|
double s = file.fileSize();
|
|
cout << pstr("Write ") << s/t << pstr(" KB/sec\n");
|
|
cout << pstr("Maximum latency: ") << maxLatency;
|
|
cout << pstr(" usec, Minimum Latency: ") << minLatency;
|
|
cout << pstr(" usec, Avg Latency: ") << totalLatency/n << pstr(" usec\n\n");
|
|
cout << pstr("Starting read test. Please wait up to a minute\n");
|
|
// do read test
|
|
file.rewind();
|
|
maxLatency = 0;
|
|
minLatency = 9999999;
|
|
totalLatency = 0;
|
|
t = millis();
|
|
for (uint32_t i = 0; i < n; i++) {
|
|
buf[BUF_SIZE-1] = 0;
|
|
uint32_t m = micros();
|
|
if (file.read(buf, sizeof(buf)) != sizeof(buf)) {
|
|
error("read failed");
|
|
}
|
|
m = micros() - m;
|
|
if (maxLatency < m) maxLatency = m;
|
|
if (minLatency > m) minLatency = m;
|
|
totalLatency += m;
|
|
if (buf[BUF_SIZE-1] != '\n') {
|
|
error("data check");
|
|
}
|
|
}
|
|
t = millis() - t;
|
|
cout << pstr("Read ") << s/t << pstr(" KB/sec\n");
|
|
cout << pstr("Maximum latency: ") << maxLatency;
|
|
cout << pstr(" usec, Minimum Latency: ") << minLatency;
|
|
cout << pstr(" usec, Avg Latency: ") << totalLatency/n << pstr(" usec\n\n");
|
|
cout << pstr("Done\n\n");
|
|
file.close();
|
|
} |