diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/dmv152/timer/timer.c')
-rw-r--r-- | c/src/lib/libbsp/m68k/dmv152/timer/timer.c | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/c/src/lib/libbsp/m68k/dmv152/timer/timer.c b/c/src/lib/libbsp/m68k/dmv152/timer/timer.c deleted file mode 100644 index 2e91a671df..0000000000 --- a/c/src/lib/libbsp/m68k/dmv152/timer/timer.c +++ /dev/null @@ -1,105 +0,0 @@ -/* timer.c - * - * NOTE: These routines will not work if the optimizer is enabled - * for some compilers. The multiple writes to the Z8036 - * may be optimized away. - * - * It is important that the timer start/stop overhead be - * determined when porting or modifying this code. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - - -#include <rtems.h> -#include <bsp.h> - -int Ttimer_val; -rtems_boolean Timer_driver_Find_average_overhead; - -rtems_isr timerisr(); - -void Timer_initialize() -{ - rtems_unsigned8 data; - - (void) set_vector( timerisr, TIMER_VECTOR, 0 ); /* install ISR */ - - Ttimer_val = 0; /* clear timer ISR count */ - Z8x36_READ ( TIMER, MASTER_INTR, data ); - Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) ); - - Z8x36_WRITE( TIMER, MASTER_CFG, 0xd4 ); - Z8x36_READ ( TIMER, MASTER_INTR, data ); - Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x7E) ); - Z8x36_WRITE( TIMER, CT1_TIME_CONST_MSB, 0x00 ); - Z8x36_WRITE( TIMER, CT1_TIME_CONST_LSB, 0x00 ); - Z8x36_WRITE( TIMER, CT1_MODE_SPEC, 0x87 ); - Z8x36_WRITE( TIMER, CNT_TMR_VECTOR, TIMER_VECTOR ); - Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x20 ); - Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x26 ); - Z8x36_READ ( TIMER, MASTER_INTR, data ); - Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0xDA) | 0x80 ); - - Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 ); - - /* - * ACC_IC54 - interrupt 5 will be vectored and mapped to level 6 - */ - - data = (*(rtems_unsigned8 *)0x0D00000B); - (*(rtems_unsigned8 *)0x0D00000B) = (data & 0x0F) | 0x60; - -} - -#define AVG_OVERHEAD 9 /* It typically takes 3.65 microseconds */ - /* (9 countdowns) to start/stop the timer. */ -#define LEAST_VALID 10 /* Don't trust a value lower than this */ - -int Read_timer() -{ - rtems_unsigned8 data; - rtems_unsigned8 msb, lsb; - rtems_unsigned32 remaining, total; - - Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xce ); /* read the counter value */ - Z8x36_READ( TIMER, CT1_CUR_CNT_MSB, msb ); - Z8x36_READ( TIMER, CT1_CUR_CNT_LSB, lsb ); - - remaining = 0x10000 - ((msb << 8) + lsb); - total = (Ttimer_val * 0x10000) + remaining; - - Z8x36_READ ( TIMER, MASTER_INTR, data ); - Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) ); - - /* do not restore old vector */ - if ( Timer_driver_Find_average_overhead == 1 ) - return total; /* in countdown units */ - - if ( total < LEAST_VALID ) - return 0; /* below timer resolution */ - - /* Clocked at 2.4615 Mhz */ - - return (int)(((float)(total-AVG_OVERHEAD)) / 2.4615 * 2.0); -} - -rtems_status_code Empty_function( void ) -{ - return RTEMS_SUCCESSFUL; -} - -void Set_find_average_overhead( - rtems_boolean find_flag -) -{ - Timer_driver_Find_average_overhead = find_flag; -} |