Diff: main.cpp

Revision:

0:070af2829ea6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 13 07:19:31 2019 +0000
@@ -0,0 +1,77 @@
+#include "mbed.h"
+#include "SDFileSystem.h"
+ 
+//Create an SDFileSystem object
+SDFileSystem sd(PB_15, PB_14, PB_13, PB_12, "sd"); //mosi, miso, sclk, cs
+Serial pc       (USBTX, USBRX); 
+Timer t;
+
+int main()
+{
+    pc.baud(115200);
+    pc.printf("starting..\n");
+    
+    //Mount the filesystem
+    sd.mount();
+ 
+    //Perform a write test
+    pc.printf("\nWriting to SD card...\n");
+    FILE *fp = fopen("/sd/cobawaktu.csv", "w");
+    if (fp != NULL) {
+
+        // t.start();
+        // fprintf(fp, "We're, writing, to, an, SD, card!,yayyy!!.");
+        // t.stop();
+        // pc.printf("The time taken for writing was %f seconds\n\n", t.read());
+
+        float i = 0.001;
+        int j=1;
+        t.start();
+        while (t.read()<=0.001){
+            fprintf(fp, "%.3f,",i);
+            if ((j%10)==0) fprintf(fp, "\n");
+            i+=0.001;
+            j++;
+        }
+        t.stop();
+        fprintf(fp, "!\n");
+        pc.printf("The time taken was %f seconds\n\n", t.read());
+
+        //i = 0;
+//        t.start();
+//        while (t.read()<=0.0001){
+//            fprintf(fp, "%d,",100+i);
+//            if ((i%10)==0) fprintf(fp, "\n");
+//            i++;
+//        }
+//        t.stop();
+//        fprintf(fp, ".\n");
+//        pc.printf("The time taken was %f seconds\n\n", t.read());
+        fclose(fp);
+    }
+
+    pc.printf("Reading from SD card...\n");
+    fp = fopen("/sd/cobawaktu.csv", "r");
+    if (fp != NULL) {
+        char c = fgetc(fp);
+        // if (c == 'W')
+        //     pc.printf("success!\n\n");
+        // else
+        //     pc.printf("incorrect char (%c)!\n", c);
+        
+        // t.start();
+        while(c!='!'){
+            pc.printf("%c",c);
+            c=fgetc(fp);
+        }
+        t.stop();
+        pc.printf("\nThe time taken for reading was %f seconds\n\n", t.read());
+        
+        fclose(fp);
+    } else {
+        pc.printf("failed!\n");
+    }
+ 
+    //Unmount the filesystem
+    sd.unmount();
+}
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