Diff: main.cpp

Revision:

0:284d0767f08c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri May 01 12:39:13 2015 +0000
@@ -0,0 +1,76 @@
+/** Beispiel SD Card I/O
+*/
+#include "mbed.h"
+#include "SDFileSystem.h"
+
+// Standard SD Card Slot auf FRDM-K64F Board
+SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); // MOSI, MISO, SCK, CS
+
+// File I/O
+FILE *fp;
+
+// Sensor
+AnalogIn poti( A0 );
+char filename[] = "/sd/poti.txt";
+
+/**
+ * Sensordaten schreiben, bzw. in Datei anfuegen
+ * @param name Name Sensor
+ * @param value Sensorwert
+ * @return -1 bei Fehler
+ */
+int writeSensorData( char name[], float value )
+{
+    // Datei oeffen und anfuegen, Alternative "w" fuer neu schreiben.
+    fp = fopen( name, "a" );
+    
+    // Fehler?
+    if (fp == NULL)
+        return  ( -1 );
+
+    fprintf( fp, "%f\n", value );
+    printf( "write %s: %f\n", name, value );
+    fclose ( fp );
+    return  ( 0 );
+}
+
+/**
+ * Sensordaten lesen
+ * @param name Name Sensor
+ * @return -1 bei Fehler
+ */
+int readSensorData( char name[] )
+{
+    fp = fopen( name, "r");
+    
+    // Fehler?
+    if (fp == NULL)
+        return  ( -1 );
+        
+    float value;        
+    while   ( fscanf( fp, "%f", &value ) > 0 )
+        printf( "read - %s: %f\n", name, value );
+        
+    fclose ( fp );
+    return  ( 0 );
+}
+
+/** Hauptprogramm */
+int main()
+{
+    printf("SD Card I/O \n");
+    while   ( 1 )
+    {
+        // 10 x Sensordaten schreiben
+        for ( int i = 0; i < 10; i++ )
+        {
+            writeSensorData( filename, poti.read() );
+            wait ( 1.0f );
+        }
+        
+        // Sensordaten lesen
+        readSensorData( filename );
+        wait ( 1.0f );
+        remove( filename );
+    }
+}