Chipcon entry in ASM.

[goodfet] / firmware / apps / chipcon / chipcon.c

diff --git a/firmware/apps/chipcon/chipcon.c b/firmware/apps/chipcon/chipcon.c
index 21c8b16..ce0a9ff 100644 (file)
--- a/firmware/apps/chipcon/chipcon.c
+++ b/firmware/apps/chipcon/chipcon.c
@@ -37,7 +37,8 @@
 //This could be more accurate.
 //Does it ever need to be?
 #define CCSPEED 3
-#define CCDELAY(x) delay(x)
+//#define CCDELAY(x) delay(x)
+#define CCDELAY(x) 
 
 #define SETMOSI P5OUT|=MOSI
 #define CLRMOSI P5OUT&=~MOSI
@@ -52,34 +53,51 @@
 void ccsetup(){
   P5OUT|=MOSI+SCK+RST;
   P5DIR|=MOSI+SCK+RST;
-  //P5DIR&=~MISO;  //MOSI is MISO
-  
   //P5REN=0xFF;
-  
 }
 
+
+/* 33 cycle critical region
+0000000e <ccdebuginit>:
+   e:  f2 d0 0d 00     bis.b   #13,    &0x0031 ;5 cycles
+  12:  31 00 
+  14:  f2 c2 31 00     bic.b   #8,     &0x0031 ;4 cycles
+  18:  d2 c3 31 00     bic.b   #1,     &0x0031 ;4
+  1c:  f2 e2 31 00     xor.b   #8,     &0x0031 ;4
+  20:  f2 e2 31 00     xor.b   #8,     &0x0031 ;4
+  24:  f2 e2 31 00     xor.b   #8,     &0x0031 ;4
+  28:  f2 e2 31 00     xor.b   #8,     &0x0031 ;4
+  2c:  d2 d3 31 00     bis.b   #1,     &0x0031 ;4
+  30:  30 41           ret                     
+*/
+
+/*
 //! Initialize the debugger
 void ccdebuginit(){
-  delay(30); //So the beginning is ready for glitching.
+  //Port output BUT NOT DIRECTION is set at start.
+  P5OUT|=MOSI+SCK+RST;
+  
+  //delay(30); //So the beginning is ready for glitching.
   
   //Two positive debug clock pulses while !RST is low.
   //Take RST low, pulse twice, then high.
   P5OUT&=~SCK;
   P5OUT&=~RST;
   
-  //pulse twice
-  CCDELAY(CCSPEED);
-  P5OUT|=SCK;  //up
-  CCDELAY(CCSPEED);
-  P5OUT&=~SCK; //down
-  CCDELAY(CCSPEED);
-  P5OUT|=SCK;  //up
-  CCDELAY(CCSPEED);
-  P5OUT&=~SCK; //down
+  //Two rising edges.
+  P5OUT^=SCK; //up
+  P5OUT^=SCK; //down
+  P5OUT^=SCK; //up
+  P5OUT^=SCK; //Unnecessary.
+  
   
   //Raise !RST.
   P5OUT|=RST;
 }
+*/
+
+//! Initialize the debugger.
+void ccdebuginit(); 
 
 //! Read and write a CC bit.
 unsigned char cctrans8(unsigned char byte){
@@ -150,14 +168,12 @@ void cchandle(unsigned char app,
     if(cmddata[0]&0x4)
       ccread(1);
     txdata(app,verb,1);
-    
     break;
   case WRITE: //Write a command with no reply.
     cccmd(len);
     txdata(app,verb,0);
     break;
   case START://enter debugger
-    ccsetup();
     ccdebuginit();
     txdata(app,verb,0);
     break;