Diff: main.cpp

Revision:

9:d0a3b4c7b261

Parent:

4:f8a5c8aa895a

Child:

10:c3614ed19126

--- a/main.cpp	Thu Mar 14 14:23:42 2013 +0000
+++ b/main.cpp	Thu Apr 19 13:31:58 2018 +0000
@@ -1,50 +1,73 @@
+/*
+Big green ugly test. Free for use bla bla bla. Do not eat.
+Tested on stm32f746zg
+Results: 814 KB/s, to slow for my project.
+No have idea how i can increase reading speed up to 4MB/s.
+*/
+
 #include "mbed.h"
 #include "USBHostMSD.h"
 
-DigitalOut led(LED1);
+Serial pc(USBTX, USBRX, 115200); // tx, rx, baud rate to avoid terminal glitches
+
+// read block size
+unsigned int bs = 65536;
+// read memory buffer
+char buff[65536];
 
-void msd_task(void const *) {
+// Binary test file, 10MB size
+unsigned long fsize=1024*1024*10;
+// start time, end time, delta time
+unsigned long time1, time2, time3;
+// speed = fsize / time3
+float speed;
+
+
+Timer t;
+
+int main() {
+
+// Mission clock on.
+t.start();
     
     USBHostMSD msd("usb");
-    int i = 0;
-    
-    while(1) {
-        
-        // try to connect a MSD device
+
+        while(1) {
         while(!msd.connect()) {
-            Thread::wait(500);
+            pc.printf("Waiting for USB\r\n");
+            wait_ms(500);
         }
-        
-        // in a loop, append a file
-        // if the device is disconnected, we try to connect it again
-        while(1) {
-            
-            // append a file
-            FILE * fp = fopen("/usb/test1.txt", "a");
+            pc.printf("Flash mounted\r\n");    
+
+            FILE * fp = fopen("/usb/test1.bin", "rb");
         
             if (fp != NULL) {
-                fprintf(fp, "Hello fun SD Card World: %d!\r\n", i++);
-                printf("Goodbye World!\r\n");
-                fclose(fp);
+                pc.printf("File opened, reading...\r\n");
+
+                time1=t.read_ms();
+                pc.printf("Start timer value = %u \r\n",time1);
+
+                    while(!feof(fp))
+                    {
+                        fread(&buff,bs,1,fp);
+                    }
+                
+                time2 = t.read_ms();
+                pc.printf("End timer value = %u\r\n",time2);
+               
+            fclose(fp);
+            pc.printf("File closed\r\n");
+
+            time3 = time2 - time1;
+            speed = fsize / time3; 
+
+            pc.printf ("Time to read file %u speed KB/s = %f \r\n======================\r\n", time3, speed);
+
             } else {
-                printf("FILE == NULL\r\n");
+                pc.printf("FILE == NULL\r\n");
             }
-            
-            Thread::wait(500);
-        
-            // if device disconnected, try to connect again
+                    
             if (!msd.connected())
                 break;
         }
-            
-    }
 }
-
-
-int main() {
-    Thread msdTask(msd_task, NULL, osPriorityNormal, 1024 * 4);
-    while(1) {
-        led=!led;
-        Thread::wait(500);
-    }
-}
\ No newline at end of file