Mike Moore / mmSPI-2

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Dependents:   Embedded_RTOS_Project

Fork of mmSPI by Mike Moore

Files at this revision

API Documentation at this revision

Revision 7:b3e8b537d5c2, committed 2013-08-14

Comitter:
gatedClock
Date:
Wed Aug 14 15:34:10 2013 +0000
Parent:
6:b480fc4e87e5
Child:
8:e2d8bbc3e659
Commit message:
void mmSPI::transceive_vector(char *cReceive, char *cSend, char cNumBytes)

Changed in this revision

mmSPI.cpp Show annotated file Show diff for this revision Revisions of this file
mmSPI.h Show annotated file Show diff for this revision Revisions of this file 
--- a/mmSPI.cpp	Wed Aug 14 15:19:24 2013 +0000
+++ b/mmSPI.cpp	Wed Aug 14 15:34:10 2013 +0000
@@ -43,10 +43,11 @@
 //  we're not going for speed, so lets go for good setup / hold.
 
                                                 // send/receive a byte over SPI.
+                                                // MSB out/in first.
     void mmSPI::transceive_byte(char *cReceive, char *cSend)
     {
       *cReceive = 0;                            // clear receive byte.                                    
-      for (cLoop01 = 7; cLoop01 >= 0; cLoop01++)// loop for 8 bits in the byte.
+      for (cLoop01 = 7; cLoop01 >= 0; cLoop01--)// loop for 8 bits in the byte.
       {
         *pSCLK = 0;                             // SPI clock negedge.
         wait(fSPIquarterP);                     // until middle of clock low.
@@ -59,6 +60,15 @@
       }
     }
 //----------------------------------------------//------------------------------
+                                                // transceive a character array.
+                                                // limit is 256 characters.
+                                                // MSB out/in first.
+    void mmSPI::transceive_vector(char *cReceive, char *cSend, char cNumBytes)
+    {    
+      for (cLoop02 = (cNumBytes - 1); cLoop02 >= 0; cLoop02--)
+      transceive_byte(&(cReceive[cLoop02]), &(cSend[cLoop02]));
+    }
+//----------------------------------------------//------------------------------
 
 
 
@@ -68,3 +78,15 @@
 
 
 
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--- a/mmSPI.h	Wed Aug 14 15:19:24 2013 +0000
+++ b/mmSPI.h	Wed Aug 14 15:34:10 2013 +0000
@@ -31,6 +31,9 @@
 
                                                 // byte transceive.
         void transceive_byte(char *cReceive, char *cSend);
+        
+                                                // byte-array transceive.
+        void transceive_vector(char *cReceive, char *cSend, char cNumBytes);
       private:
       
       DigitalOut * pMOSI;                       // SPI pin.
@@ -39,6 +42,7 @@
       float        fSPIfreq;                    // SPI clock   frequency.
       float        fSPIquarterP;                // SPI quarter period.
       char         cLoop01;                     // loop index.
+      char         cLoop02;                     // loop index.