X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Flib%2Fcommand.c;h=8f9501a61841cf2ea0a4c0110f9b92eeb256fd53;hp=d984fca791feb33f357e38223acde6d73d0bd090;hb=757884d51cc6b119a3b1773873c446926b26011d;hpb=f4a6b415e762bcdc560f3ea655851d16f483ea5a

diff --git a/firmware/lib/command.c b/firmware/lib/command.c
index d984fca..8f9501a 100644
--- a/firmware/lib/command.c
+++ b/firmware/lib/command.c
@@ -30,13 +30,35 @@ void debugstr(const char *str){
   txstring(0xFF,0xFF,str);
 }
 
+//! brief Debug a hex word string.
+void debughex(u16 v) {
+  debugbytes((void *)&v, 2);
+}
+
+//! brief Debug a hex word string.
+void debughex32(u32 v) {
+  debugbytes((void *)&v, 4);
+}
+
+/*! \brief Transmit debug bytes.
+  
+  Transmits bytes for debugging.
+*/
+void debugbytes(const char *bytes, unsigned int len){
+  u16 i;
+  txhead(0xFF,0xFE,len);
+  for(i=0;i<len;i++)
+    serial_tx(bytes[i]);
+}
+
+
 //! Transmit a header.
 void txhead(unsigned char app,
 	    unsigned char verb,
 	    unsigned long len){
   serial_tx(app);
   serial_tx(verb);
-  //serial_tx(len);
+  //serial_tx(len); //old protocol
   txword(len);
 }
 
@@ -106,3 +128,57 @@ void msdelay(unsigned int ms){
   }
   //Using TimerA might be cleaner.
 }
+
+
+/* To better satisfy the somewhat odd timing requirements for
+   dsPIC33F/PIC24H ICSP programming, and for better control of GoodFET
+   timing more generally, here are a few delay routines that use Timer A.
+
+   Note that I wrote these referring only to the MSP430x2xx family
+   manual. Beware on MSP430x1xx chips. Further note that, assuming
+   some minor errors will be made, I try to err on the side of
+   delaying slightly longer than requested. */
+void prep_timer()
+{
+  BCSCTL2 = 0x00; /* In particular, use DCOCLK as SMCLK source with
+		     divider 1. Hence, Timer A ticks with system
+		     clock at 16 MHz. */
+
+  TACTL = 0x0204; /* Driven by SMCLK; disable Timer A interrupts;
+		     reset timer in case it was previously in use */
+}
+
+//! Delay for specified number of milliseconds (given 16 MHz clock)
+void delay_ms( unsigned int ms )
+{
+  // 16000 ticks = 1 ms
+  TACTL |= 0x20; // Start timer!
+  while (ms--) {
+    while (TAR < 16000)
+      asm( "nop" );
+    TACTL = 0x0224;
+  }
+  TACTL = 0x0204; // Reset Timer A, till next time
+}
+
+//! Delay for specified number of microseconds (given 16 MHz clock)
+void delay_us( unsigned int us )
+{
+  // 16 ticks = 1 us
+  TACTL |= 0x20; // Start timer!
+  while (us--) {
+    while (TAR < 16)
+      asm( "nop" );
+    TACTL = 0x0224;
+  }
+  TACTL = 0x0204; // Reset Timer A, till next time
+}
+
+//! Delay for specified number of clock ticks (16 MHz clock implies 62.5 ns per tick).
+void delay_ticks( unsigned int num_ticks )
+{
+  TACTL |= 0x20; // Start timer
+  while (TAR < num_ticks)
+    asm( "nop" );
+  TACTL = 0x0204; // Reset Timer A, till next time
+}