diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/idp/timer/timerisr.S')
| -rw-r--r-- | c/src/lib/libbsp/m68k/idp/timer/timerisr.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/idp/timer/timerisr.S b/c/src/lib/libbsp/m68k/idp/timer/timerisr.S new file mode 100644 index 0000000000..74461f3714 --- /dev/null +++ b/c/src/lib/libbsp/m68k/idp/timer/timerisr.S @@ -0,0 +1,38 @@ +/* timer_isr() + * + * This routine provides the ISR for the MC68230 timer on the Motorola + * IDP board. The timer is set up to generate an interrupt at maximum + * intervals. + * + * Code modified by Doug McBride, Colorado Space Grant College + * countdown should be loaded automatically + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include "asm.h" + +BEGIN_CODE + +.set TSR, 0x00c0106B | base address of PIT register "TSR" + + PUBLIC (timerisr) +SYM (timerisr): + movb #1,TSR | acknowledge interrupt + addql #1, SYM (Ttimer_val) | increment timer value + rte + +END_CODE +END |