Diff: mmSPI.cpp

Revision:

24:d3b8c68f41f2

Parent:

23:dbd89a56716d

Child:

26:26a8f31a31b8

--- a/mmSPI.cpp	Tue Aug 20 14:25:47 2013 +0000
+++ b/mmSPI.cpp	Tue Aug 20 14:38:50 2013 +0000
@@ -126,8 +126,7 @@
     {     
       int dLoop;                                // loop index.
       
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00; 
+      clear_transmit_vector();                  // clear transmit vector.
       
       pcSend[7] = 0x02;                         // mbed sends a command.
       
@@ -137,19 +136,14 @@
  
       transceive_vector();                      // transmit command.
  
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00; 
+      clear_transmit_vector();                  // clear transmit vector.
     }
 //----------------------------------------------//------------------------------
                                                 // returns the content of
                                                 // a CPU register.
     char mmSPI::read_register(char cRegister)
     { 
-      int dLoop;      
-
-      
-                                                // send all 0.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;    
+      clear_transmit_vector();                  // clear transmit vector.
                    
       transceive_vector();                      // snap & scan-out reg contents.
       
@@ -158,17 +152,11 @@
 //----------------------------------------------//------------------------------
     void mmSPI::write_memory(char cHData, char cLdata, char cAddress)
     {
-      int dLoop;                                // loop index.
-    
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;   
-      
-                                                // R3 <- address.
-                                                // R2 <- high-data.
-                                                // R1 <- low-data.
-      write_register(0x03,cAddress); 
-      write_register(0x02,cHData);
-      write_register(0x01,cLdata);
+      clear_transmit_vector();                  // clear transmit vector.
+                    
+      write_register(0x03,cAddress);            // R3 <- address.
+      write_register(0x02,cHData);              // R2 <- high-data.
+      write_register(0x01,cLdata);              // R1 <- low-data.
   
       pcSend[7] = 0x00;                         // write-enable high.
       pcSend[1] = 0x02;
@@ -179,26 +167,20 @@
       pcSend[1] = 0x00;
       pcSend[0] = 0x00;
       transceive_vector();   
-      
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00; 
-      
+                           
+      clear_transmit_vector();                  // clear transmit vector. 
     }
 //----------------------------------------------//------------------------------
                                                 // fetch a word from main memory.
     unsigned int mmSPI::read_memory(char cAddress)
-    {
-      int          dLoop;                       // loop index.   
+    { 
       unsigned int udMemoryContent;             // return variable.
       char         cHData;                      // returned data-high.
       char         cLData;                      // returned data-low.
-    
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;  
+                               
+      clear_transmit_vector();                  // clear transmit vector.
             
-      
-                                                // R3 <- address.
-      write_register(0x03,cAddress);
+      write_register(0x03,cAddress);            // R3 <= address.
       
       pcSend[7] = 0x02;                         // mbed sends command.
       pcSend[1] = 0xC8;                         // R2 <- MM[R3]
@@ -210,19 +192,23 @@
       pcSend[0] = 0x00;
       transceive_vector();                      // send command.      
            
-                                                // obtain MM content.
-      cHData = read_register(0x02);  
-      cLData = read_register(0x01);    
+      cHData = read_register(0x02);             // obtain MM high-data-byte.
+      cLData = read_register(0x01);             // obtain MM low-data-byte.
     
                                                 
       udMemoryContent = (cHData << 8) + cLData; // build the memory word.
-      
-                                                // clear transmit vector.
-      for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+                         
+      clear_transmit_vector();                  // clear transmit vector.
     
       return udMemoryContent;                   // return the memory word.
     }
 //----------------------------------------------//------------------------------
+    void mmSPI::clear_transmit_vector(void)     // fill transmit buffer with 0.
+    {
+      int dLoop;
+      for (dLoop = 0; dLoop < dNumBytes; dLoop++) pcSend[dLoop] = 0x00;
+    }
+//----------------------------------------------//------------------------------
 
 
 
@@ -236,5 +222,3 @@
 
 
 
-
-