Diff: main.cpp

Revision:

0:8f297fe0c66a

Child:

1:c39cfc31349d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 12 13:55:01 2016 +0000
@@ -0,0 +1,103 @@
+#include "mbed.h"
+#include "SDFileSystemDMA.h"
+#define MOSI        D4
+#define MISO        D5
+#define SCLK        D3
+#define CS          D10
+//#define CD          D9      // detect SD card insertion. Do open always. 
+//#define CD_TYPE     SDFileSystem::SWITCH_POS_NC     // always instertion state
+//#define SPI_CLOCK_HZ    ( 12 * 1000000 ) 
+Timer timer;
+
+SDFileSystem sd( MOSI, MISO, SCLK, CS, "sd");  
+//SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
+ DigitalIn button(USER_BUTTON, PullUp);
+
+char buffer[512];
+#define X_MEGA_BYTE     ((1)*1024*1024) /* 1Mbyte */
+#define FILE_NAME   "GPATH"
+
+int base_test() {
+    
+    printf("Hello World!\n");   
+    while(button);
+
+    mkdir("/sd/mydirx", 0777);
+    
+    FILE *fp = fopen("/sd/mydirx/sdtest.txt", "w");
+    if(fp == NULL) {
+        error("Could not open file for write\n");
+    }
+    fprintf(fp, "Hello fun SD Card World!");
+    fclose(fp); 
+ 
+    printf("Goodbye World!\n");
+        return 0;
+}
+
+void writeTest()
+{
+    //Test write performance by creating a 1MB file
+    printf("Testing %dByte buffer: write performance...", sizeof(buffer));
+    FileHandle* file = sd.open(FILE_NAME, O_WRONLY | O_CREAT | O_TRUNC);
+    if (file != NULL) {
+        timer.start();
+        for (uint32_t i = 0; i < (X_MEGA_BYTE / 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: %d KB/s\n", (  1024 * 1000000 ) / timer.read_us() );
+        }
+        timer.reset();
+    } else {
+        printf("failed to create file!\n");
+    }
+}
+
+
+void readTest()
+{
+    //Test read performance by reading the 1MB file created by writeTest()
+    printf("Testing %dByte buffer: read performance...", sizeof(buffer));
+    FileHandle* file = sd.open(FILE_NAME, O_RDONLY);
+    if (file != NULL) {
+        timer.start();
+        int iterations = 0;
+        while (file->read(buffer, sizeof(buffer)) == sizeof(buffer))
+            iterations++;
+        timer.stop();
+        if (iterations != (X_MEGA_BYTE / sizeof(buffer))){
+            printf("read error!\n");
+                }
+        else if (file->close()){
+            printf("failed to close file!\n");
+                }
+       // else if (sd.remove(FILE_NAME))
+       //     printf("failed to delete file!\n");
+        else{
+            printf("done!\n\tResult: %d KB/s\n",  (  1024 * 1000000 ) / timer.read_us());
+        }
+        timer.reset();
+    } else {
+        printf("failed to open file!\n");
+    }
+}
+
+int main(){
+    /* UART Baudrate is 9600bps*/
+    while(1){
+        printf("\nStart SD card accsess test! -- Press button");
+        printf("\nWriting is very slow, wait several minuts.\n");   
+        while(button);
+        writeTest();
+        readTest();
+    }
+}