X-Git-Url: http://git.rot13.org/?p=goodfet;a=blobdiff_plain;f=firmware%2Flib%2Fcommand.c;h=6388c643b366a82b2f1384c2b0e6b1960098d944;hp=a8265714137218a416f9b6b040dde5f7113046df;hb=f244df1b2d3010548ed2cceabdde44f36089a29a;hpb=4d264916c0263052ba7316d7127de6b4cfe8145c

diff --git a/firmware/lib/command.c b/firmware/lib/command.c
index a826571..6388c64 100644
--- a/firmware/lib/command.c
+++ b/firmware/lib/command.c
@@ -1,6 +1,6 @@
 /*! \file command.c
   \author Travis Goodspeed
-  \brief These functions manage command interpretation.
+  \brief These functions manage command interpretation and timing.
 */
 
 #include "command.h"
@@ -30,6 +30,16 @@ 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.
@@ -56,7 +66,7 @@ void txhead(unsigned char app,
 void txdata(unsigned char app,
 	    unsigned char verb,
 	    unsigned long len){
-  unsigned int i=0;
+  unsigned long i=0;
   if(silent)
     return;
   txhead(app,verb,len);
@@ -118,3 +128,74 @@ void msdelay(unsigned int ms){
   }
   //Using TimerA might be cleaner.
 }
+
+
+/* To better satisfy the somewhat odd timing requirements for
+   PIC33F/24H/24F ICSP programming, and for better control of GoodFET
+   timing more generally, here are a few delay routines that use Timer B.
+
+   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()
+{
+  #ifdef MSP430
+  BCSCTL2 = 0x00; /* In particular, use DCOCLK as SMCLK source with
+		     divider 1. Hence, Timer B ticks with system
+		     clock at 16 MHz. */
+
+  TBCTL = 0x0204; /* Driven by SMCLK; disable Timer B interrupts;
+		     reset timer in case it was previously in use */
+  #else
+  #warning "prep_timer() unimplemented for this platform."
+  #endif
+}
+#if (platform != tilaunchpad)
+//! Delay for specified number of milliseconds (given 16 MHz clock)
+void delay_ms( unsigned int ms )
+{
+  #ifdef MSP430
+  // 16000 ticks = 1 ms
+  TBCTL |= 0x20; // Start timer!
+  while (ms--) {
+    while (TBR < 16000)
+      asm( "nop" );
+    TBCTL = 0x0224;
+  }
+  TBCTL = 0x0204; // Reset Timer B, till next time
+  #else
+  debugstr("delay_ms unimplemented");
+  #endif
+}
+
+//! Delay for specified number of microseconds (given 16 MHz clock)
+void delay_us( unsigned int us )
+{
+  #ifdef MSP430
+  // 16 ticks = 1 us
+  TBCTL |= 0x20; // Start timer!
+  while (us--) {
+    while (TBR < 16)
+      asm( "nop" );
+    TBCTL = 0x0224;
+  }
+  TBCTL = 0x0204; // Reset Timer B, till next time
+  #else
+  debugstr("delay_us unimplemented");
+  #endif
+}
+
+//! Delay for specified number of clock ticks (16 MHz clock implies 62.5 ns per tick).
+void delay_ticks( unsigned int num_ticks )
+{
+  #ifdef MSP430
+  TBCTL |= 0x20; // Start timer
+  while (TBR < num_ticks)
+    asm( "nop" );
+  TBCTL = 0x0204; // Reset Timer B, till next time
+  #else
+  debugstr("delay_ticks unimplemented");
+  #endif
+}
+#endif