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lxdream.org :: lxdream/test/timer.c
lxdream 0.9.1
released Jun 29
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filename test/timer.c
changeset 225:e5cea6125580
next262:bc96e0b79308
author nkeynes
date Wed Sep 20 09:52:32 2006 +0000 (14 years ago)
permissions -rw-r--r--
last change Commit start of SH4 test cases
view annotate diff log raw
     1 #include "../lib.h"
     2 #define TMU_CHANNEL 2
     4 #define TOCR 0xFFD80000  /* Output control register */
     5 #define TSTR 0xFFD80004  /* Start register */
     6 #define TCOR(c) (0xFFD80008 + (c*12))  /* Constant register */
     7 #define TCNT(c) (0xFFD8000C + (c*12))  /* Count register */
     8 #define TCR(c)  (0xFFD80010 + (c*12))  /* Control register */
    10 /**
    11  * Initialize the on-chip timer controller. We snag TMU channel 2 in its
    12  * highest resolution mode, and start it counting down from max_int. 
    13  */
    14 void timer_start() {
    15     unsigned int val = long_read(TSTR);
    16     long_write( TSTR, val & (~(1<<TMU_CHANNEL)) ); /* Stop counter */
    17     long_write( TCOR(TMU_CHANNEL), 0xFFFFFFFF );
    18     long_write( TCNT(TMU_CHANNEL), 0xFFFFFFFF );
    19     long_write( TCR(TMU_CHANNEL), 0x00000000 );
    20     long_write( TSTR, val | (1<<TMU_CHANNEL) );
    21 }
    23 /**
    24  * Report the current value of TMU2.
    25  */
    26 long timer_gettime() {
    27     return long_read(TCNT(TMU_CHANNEL));
    28 }
    30 /**
    31  * Stop TMU2 and report the current value.
    32  */
    33 long timer_stop() {
    34     long_write( TSTR, long_read(TSTR) & (~(1<<TMU_CHANNEL)) );
    35     return long_read( TCNT(TMU_CHANNEL) );
    36 }
    39 /**
    40  * Convert the supplied timer value to a number of micro seconds since the timer
    41  * was started.
    42  */
    43 long timer_to_microsecs( long value ) {
    44     return value;
    45 }
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