Diff: mmSPI.cpp

Revision:

32:5a5d9525c6c4

Parent:

31:ea7b25e494b5

Child:

33:59e13ec04ea8

Child:

34:d5553509f31a

--- a/mmSPI.cpp	Sun Aug 25 20:12:32 2013 +0000
+++ b/mmSPI.cpp	Mon Aug 26 22:39:44 2013 +0000
@@ -1,22 +1,24 @@
 /*----------------------------------------------//------------------------------
     student   : m-moore
-    class     : external SPI interface
+    email     : gated.clock@gmail.com
+    class     : usb device drivers
     directory : mmSPI
     file      : mmSPI.cpp
+    date      : september 3, 2013.
 ------------------------------------------------//----------------------------*/
     #include "mmSPI.h"
 /*----------------------------------------------//------------------------------
 ------------------------------------------------//----------------------------*/
 //==============================================//==============================
-//  consider resetting the fpga around here, because
-//  the micro may be wiggling these signals before here.
     mmSPI::mmSPI()                              // constructor.
     {
       allocations();                            // object allocations.
       
-      *pSCLK   = 0;                             // initialize.
-      *pCPUclk = 0;                             // initialize.
-    }
+      *pSCLK        = 0;                        // initialize.
+      *pCPUclk      = 0;                        // initialize.
+      ulSPIclkCount = 0;                        // initialize.
+      ulCPUclkCount = 0;                        // initialize.
+    }                                           // constructor.
 //----------------------------------------------//------------------------------    
     mmSPI::~mmSPI()                             // destructor.
     {
@@ -25,22 +27,22 @@
       if (pMISO)   {delete pMISO;   pMISO   = NULL;}
       if (pSCLK)   {delete pSCLK;   pSCLK   = NULL;}
       if (pCPUclk) {delete pCPUclk; pCPUclk = NULL;}
-    } 
+    }                                           // destructor.
 //----------------------------------------------//------------------------------
     void mmSPI::allocations(void)               // object allocations.
     {
-      pMOSI   = new DigitalOut(mmSPI_MOSI);       // SPI MOSI pin object.
+      pMOSI   = new DigitalOut(mmSPI_MOSI);     // SPI MOSI pin object.
       if (!pMOSI) error("\n\r mmSPI::allocations : FATAL malloc error for pMOSI. \n\r"); 
       
-      pMISO   = new DigitalOut(mmSPI_MISO);      // SPI MISO pin object.
+      pMISO   = new DigitalOut(mmSPI_MISO);     // SPI MISO pin object.
       if (!pMISO) error("\n\r mmSPI::allocations : FATAL malloc error for pMISO. \n\r"); 
     
-      pSCLK   = new DigitalOut(mmSPI_SCLK);       // SPI SCLK pin object.
+      pSCLK   = new DigitalOut(mmSPI_SCLK);     // SPI SCLK pin object.
       if (!pSCLK) error("\n\r mmSPI::allocations : FATAL malloc error for pSCLK. \n\r"); 
       
-      pCPUclk = new DigitalOut(mmCPU_CLK);          // SPI SCLK pin object.
+      pCPUclk = new DigitalOut(mmCPU_CLK);      // SPI SCLK pin object.
       if (!pCPUclk) error("\n\r mmSPI::allocations : FATAL malloc error for pCPUclk. \n\r");
-    } 
+    }                                           // allocations.
 //----------------------------------------------//------------------------------    
     void mmSPI::setSPIfrequency(float fFreq)    // set SPI clock frequency.
     {
@@ -54,19 +56,19 @@
     void mmSPI::setSendBuffer(char * pcSendBuffer)
     {
       pcSend = pcSendBuffer;                    // promote to object scope.
-    }
+    }                                           // setSendBuffer.
 //----------------------------------------------//------------------------------    
                                                 // obtain SPI receive buffer pointer.  
     void mmSPI::setReceiveBuffer(char * pcReceiveBuffer)
     {
       pcReceive = pcReceiveBuffer;              // promote to object scope.
-    }    
+    }                                           // setReceiveBuffer.
 //----------------------------------------------//------------------------------
                                                 // obtain number of SPI bytes.
     void mmSPI::setNumberOfBytes(int dNumberOfBytes)
     {
       dNumBytes = dNumberOfBytes;               // promote to object scope.
-    }
+    }                                           // setNumberOfBytes.
 //----------------------------------------------//------------------------------
                                                 // transceive a character array.
                                                 // MSB out/in first.
@@ -95,6 +97,7 @@
         *pCPUclk = 0;  
         wait(fSPIquarterP); 
         wait(fSPIquarterP); 
+        ulCPUclkCount++;
       }                                         // if pre-CPU clock.
       
       if (cPreSPI)                              // if pre-SPI pulse.
@@ -103,6 +106,7 @@
         wait(fSPIquarterP); 
         wait(fSPIquarterP); 
         *pSCLK = 0;
+        ulSPIclkCount++;
       }                                         // if pre-SPI pulse.
       
       if (cScan)                                // if cScan.
@@ -113,6 +117,7 @@
         wait(fSPIquarterP); 
       
       
+                                                // main SPI scan loop.
         for (dIndex = (dNumBytes * 8) - 1; dIndex >= 0; dIndex--)
         {
           dMisoByteIndex = dIndex / 8;
@@ -128,7 +133,8 @@
           *pMOSI = ((pcSend[dMosiByteIndex]) >> dMosiBitIndex) & 1;
           wait(fSPIquarterP); 
           wait(fSPIquarterP);
-        }
+          ulSPIclkCount++;
+        }                                       // main SPI scan loop.
       }                                         // if cScan.
       
       if (cPostCPU)                             // if post-CPU pulse.
@@ -138,14 +144,16 @@
         wait(fSPIquarterP);     
         *pCPUclk = 0;  
         wait(fSPIquarterP); 
-        wait(fSPIquarterP);       
+        wait(fSPIquarterP);   
+        ulCPUclkCount++;    
         
         *pSCLK = 1;                             // clear-out the SPI parallel-load enable.        
         wait(fSPIquarterP); 
         wait(fSPIquarterP); 
         *pSCLK = 0;        
+        ulSPIclkCount++;
       }                                         // if post-CPU pulse.
-    }
+    }                                           // transceive_vector.
 //----------------------------------------------//------------------------------
 //  cRegister  ->  CPU_register
 //      0            R0
@@ -172,7 +180,7 @@
       transceive_vector(1,1,1,0);               // transmit command.
  
       clear_transmit_vector();                  // clear transmit vector.
-    }
+    }                                           // write_register.
 //----------------------------------------------//------------------------------
 //  cRegister  ->  CPU_register
 //      0      ->    R0
@@ -194,7 +202,7 @@
       transceive_vector(1,1,1,0);               // snap & scan-out reg contents.
       
       return (pcReceive[6 - cRegister]);        // return the particular reg value.
-    }
+    }                                           // read_register.
 //----------------------------------------------//------------------------------
     void mmSPI::write_memory(char cHData, char cLdata, char cAddress)
     {
@@ -215,7 +223,7 @@
       transceive_vector(1,1,1,0);   
                            
       clear_transmit_vector();                  // clear transmit vector. 
-    }
+    }                                           // write_memory.
 //----------------------------------------------//------------------------------
                                                 // fetch a word from main memory.
     unsigned int mmSPI::read_memory(char cAddress)
@@ -246,7 +254,7 @@
       clear_transmit_vector();                  // clear transmit vector.
     
       return udMemoryContent;                   // return the memory word.
-    }
+    }                                           // read_memory.
 //----------------------------------------------//------------------------------
     void mmSPI::step(void)                      // step the CPU.
     {      
@@ -255,13 +263,17 @@
       transceive_vector(0,0,0,1);               // advance CPU, clear shadow-load.
       pcSend[7] = 0x02;                         // ready to disable CPU mode.
       transceive_vector(0,0,1,0);               // disable CPU mode.
-    }
+    }                                           // step.
 //----------------------------------------------//------------------------------
     void mmSPI::clear_transmit_vector(void)     // fill transmit buffer with 0.
     {
       int dLoop;
       for (dLoop = 0; dLoop < dNumBytes; dLoop++) pcSend[dLoop] = 0x00;
-    }
+    }                                           // clear_transmit_vector.
+//----------------------------------------------//------------------------------
+                                                // getters.
+    unsigned long mmSPI::SPIClockCount() {return ulSPIclkCount;}
+    unsigned long mmSPI::CPUClockCount() {return ulCPUclkCount;}
 //----------------------------------------------//------------------------------
 
 
@@ -271,8 +283,3 @@
 
 
 
-
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