1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/test/timer.c	Tue Dec 19 11:54:47 2006 +0000
     1.3 @@ -0,0 +1,45 @@
     1.4 +#include "../lib.h"
     1.5 +#define TMU_CHANNEL 2
     1.6 +
     1.7 +#define TOCR 0xFFD80000  /* Output control register */
     1.8 +#define TSTR 0xFFD80004  /* Start register */
     1.9 +#define TCOR(c) (0xFFD80008 + (c*12))  /* Constant register */
    1.10 +#define TCNT(c) (0xFFD8000C + (c*12))  /* Count register */
    1.11 +#define TCR(c)  (0xFFD80010 + (c*12))  /* Control register */
    1.12 +
    1.13 +/**
    1.14 + * Initialize the on-chip timer controller. We snag TMU channel 2 in its
    1.15 + * highest resolution mode, and start it counting down from max_int. 
    1.16 + */
    1.17 +void timer_start() {
    1.18 +    unsigned int val = long_read(TSTR);
    1.19 +    long_write( TSTR, val & (~(1<<TMU_CHANNEL)) ); /* Stop counter */
    1.20 +    long_write( TCOR(TMU_CHANNEL), 0xFFFFFFFF );
    1.21 +    long_write( TCNT(TMU_CHANNEL), 0xFFFFFFFF );
    1.22 +    long_write( TCR(TMU_CHANNEL), 0x00000000 );
    1.23 +    long_write( TSTR, val | (1<<TMU_CHANNEL) );
    1.24 +}
    1.25 +
    1.26 +/**
    1.27 + * Report the current value of TMU2.
    1.28 + */
    1.29 +long timer_gettime() {
    1.30 +    return long_read(TCNT(TMU_CHANNEL));
    1.31 +}
    1.32 +
    1.33 +/**
    1.34 + * Stop TMU2 and report the current value.
    1.35 + */
    1.36 +long timer_stop() {
    1.37 +    long_write( TSTR, long_read(TSTR) & (~(1<<TMU_CHANNEL)) );
    1.38 +    return long_read( TCNT(TMU_CHANNEL) );
    1.39 +}
    1.40 +
    1.41 +
    1.42 +/**
    1.43 + * Convert the supplied timer value to a number of micro seconds since the timer
    1.44 + * was started.
    1.45 + */
    1.46 +long timer_to_microsecs( long value ) {
    1.47 +    return value;
    1.48 +}