/*! \file command.c
\author Travis Goodspeed
- \brief These functions manage command interpretation.
+ \brief These functions manage command interpretation and timing.
*/
#include "command.h"
//! brief Debug a hex word string.
void debughex(u16 v) {
- unsigned char a[7];
- a[0]='0'; a[1]='x';
-
- a[2]=0xf&(v>>12);
- a[2]+=(a[2]>9)?('a'-10):'0';
-
- a[3]=0xf&(v>>8);
- a[3]+=(a[3]>9)?('a'-10):'0';
-
- a[4]=0xf&(v>>4);
- a[4]+=(a[4]>9)?('a'-10):'0';
-
- a[5]=0xf&(v>>0);
- a[5]+=(a[5]>9)?('a'-10):'0';
-
- a[6]=0;
+ debugbytes((void *)&v, 2);
+}
- txstring(0xFF,0xFF,a);
+//! brief Debug a hex word string.
+void debughex32(u32 v) {
+ debugbytes((void *)&v, 4);
}
/*! \brief Transmit debug bytes.
}
//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 "Function 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