Diff: 09_Files_SD/SD_Speed_Test.cpp

Revision:

2:17a5c34b3a79

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/09_Files_SD/SD_Speed_Test.cpp	Tue Jul 09 02:23:18 2019 +0000
@@ -0,0 +1,146 @@
+/* https://os.mbed.com/users/neilt6/code/SDFileSystem/
+ *
+ * Mounts an SD card, creates a buffer of random data, then writes and reads
+ * back that data. Finishes with a report of the size of the buffer file
+ * and read / write speeds.
+ *
+ * SDFileSystem library requires MBED Release 165, dated Feb 20, 2019. Updates will break it.
+ * If having difficulty, import the link above as independant program.
+ */
+
+#ifdef COMPILE_SD_Speed_Test
+
+#include "SDFileSystem.h"
+
+Timer timer;
+DigitalIn button(D7, PullUp);
+// MOSI, MISO, CLK, CS, "name", detect
+SDFileSystem sd(PB_5, PB_4, PB_3, PA_11, "sd", PA_8, SDFileSystem::SWITCH_NEG_NC, 25000000);
+char buffer[4096];
+
+void writeTest()
+{
+    //Test write performance by creating a 1MB file
+    printf("Testing %iB write performance...", sizeof(buffer));
+    FileHandle* file = sd.open("Test File.bin", O_WRONLY | O_CREAT | O_TRUNC);
+    if (file != NULL) {
+        timer.start();
+        for (int i = 0; i < (1048576 / sizeof(buffer)); i++) {
+            if (file->write(buffer, sizeof(buffer)) != sizeof(buffer)) {
+                timer.stop();
+                printf("write error!\n");
+                timer.reset();
+                return;
+            }
+        }
+        timer.stop();
+        if (file->close())
+            printf("failed to close file!\n");
+        else
+            printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
+        timer.reset();
+    } else {
+        printf("failed to create file!\n");
+    }
+}
+
+void readTest()
+{
+    //Test read performance by reading the 1MB file created by writeTest()
+    printf("Testing %iB read performance...", sizeof(buffer));
+    FileHandle* file = sd.open("Test File.bin", O_RDONLY);
+    if (file != NULL) {
+        timer.start();
+        int iterations = 0;
+        while (file->read(buffer, sizeof(buffer)) == sizeof(buffer))
+            iterations++;
+        timer.stop();
+        if (iterations != (1048576 / sizeof(buffer)))
+            printf("read error!\n");
+        else if (file->close())
+            printf("failed to close file!\n");
+        else if (sd.remove("Test File.bin"))
+            printf("failed to delete file!\n");
+        else
+            printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
+        timer.reset();
+    } else {
+        printf("failed to open file!\n");
+    }
+}
+
+int main()
+{
+    printf("SD Card Tester...\n");
+    //Configure CRC, large frames, and write validation
+    sd.crc(true);
+    sd.large_frames(true);
+    sd.write_validation(true);
+
+    printf("Filling buffer with random data for write test...\n");
+    //Fill the buffer with random data for the write test
+    srand(time(NULL));
+    for (int i = 0; i < sizeof(buffer); i++)
+        buffer[i] = rand();
+    printf("Done. Press button to test\n");
+
+    while(1) {
+        //Simple button debouncing
+        wait(0.5);
+
+        //Print the start message
+        printf("\nStarting Tests: ");
+
+        //Wait for the button to be pressed
+        while(button);
+
+        //Make sure a card is present
+        if (!sd.card_present()) {
+            printf("\nNo card present!\n");
+            continue;
+        }
+
+        //Try to mount the SD card
+        printf("\nMounting SD card...");
+        if (sd.mount() != 0) {
+            printf("failed!\n");
+            continue;
+        }
+        printf("success!\n");
+
+        //Display the card type
+        printf("\tCard type: ");
+        SDFileSystem::CardType cardType = sd.card_type();
+        if (cardType == SDFileSystem::CARD_NONE)
+            printf("None\n");
+        else if (cardType == SDFileSystem::CARD_MMC)
+            printf("MMC\n");
+        else if (cardType == SDFileSystem::CARD_SD)
+            printf("SD\n");
+        else if (cardType == SDFileSystem::CARD_SDHC)
+            printf("SDHC\n");
+        else
+            printf("Unknown\n");
+
+        //Display the card capacity
+        printf("\tSectors: %u\n", sd.disk_sectors());
+        printf("\tCapacity: %.1fMB\n", sd.disk_sectors() / 2048.0);
+
+        /*//Format the card
+        printf("Formatting SD card...");
+        if (sd.format() != 0) {
+            printf("failed!\n");
+            continue;
+        }
+        printf("success!\n");*/
+
+        //Perform a read/write test
+        writeTest();
+        readTest();
+
+        //Unmount the SD card
+        sd.unmount();
+    }
+}
+
+#endif
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