updates.

[goodfet] / firmware / lib / command.c

diff --git a/firmware/lib/command.c b/firmware/lib/command.c
index 8d9eac1..8b83d47 100644 (file)
--- a/firmware/lib/command.c
+++ b/firmware/lib/command.c
@@ -1,23 +1,21 @@
 /*! \file command.c
   \author Travis Goodspeed
-  \brief These functions manage command interpretation.
+  \brief These functions manage command interpretation and timing.
 */
 
 #include "command.h"
 #include "platform.h"
 #include <string.h>
 
-unsigned char cmddata[256];
+unsigned char cmddata[CMDDATALEN];
 unsigned char silent=0;
 
 //! Transmit a string.
 void txstring(unsigned char app,
              unsigned char verb,
              const char *str){
-  unsigned char len=strlen(str);
-  serial_tx(app);
-  serial_tx(verb);
-  serial_tx(len);
+  unsigned long len=strlen(str);
+  txhead(app,verb,len);
   while(len--)
     serial_tx(*(str++));
 }
@@ -32,19 +30,42 @@ 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 int len){
+           unsigned long len){
   serial_tx(app);
   serial_tx(verb);
-  serial_tx(len);
+  //serial_tx(len); //old protocol
+  txword(len);
 }
 
 //! Transmit data.
 void txdata(unsigned char app,
            unsigned char verb,
-           unsigned int len){
+           unsigned long len){
   unsigned int i=0;
   if(silent)
     return;
@@ -54,6 +75,41 @@ void txdata(unsigned char app,
   }
 }
 
+//! Receive a long.
+unsigned long rxlong(){
+  unsigned long toret=0;
+  toret=serial_rx();
+  toret|=(((long)serial_rx())<<8);
+  toret|=(((long)serial_rx())<<16);
+  toret|=(((long)serial_rx())<<24);
+  return toret;
+}
+//! Receive a word.
+unsigned int rxword(){
+  unsigned long toret=0;
+  toret=serial_rx();
+  toret|=(((long)serial_rx())<<8);
+  return toret;
+}
+//! Transmit a long.
+void txlong(unsigned long l){
+  serial_tx(l&0xFF);
+  l>>=8;
+  serial_tx(l&0xFF);
+  l>>=8;
+  serial_tx(l&0xFF);
+  l>>=8;
+  serial_tx(l&0xFF);
+  l>>=8;
+}
+//! Transmit a word.
+void txword(unsigned int l){
+  serial_tx(l&0xFF);
+  l>>=8;
+  serial_tx(l&0xFF);
+  l>>=8;
+}
+
 //Be very careful changing delay().
 //It was chosen poorly by trial and error.
 
@@ -72,3 +128,57 @@ 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()
+{
+  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 */
+}
+
+//! Delay for specified number of milliseconds (given 16 MHz clock)
+void delay_ms( unsigned int ms )
+{
+  // 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
+}
+
+//! Delay for specified number of microseconds (given 16 MHz clock)
+void delay_us( unsigned int us )
+{
+  // 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
+}
+
+//! Delay for specified number of clock ticks (16 MHz clock implies 62.5 ns per tick).
+void delay_ticks( unsigned int num_ticks )
+{
+  TBCTL |= 0x20; // Start timer
+  while (TBR < num_ticks)
+    asm( "nop" );
+  TBCTL = 0x0204; // Reset Timer B, till next time
+}