Added real-time clock functions to the cx16 library.

2019-12-27 18:07:37 -05:00
parent f067c4530f
commit b56ba8f073
6 changed files with 229 additions and 48 deletions
--- a/libsrc/cx16/tmcommon.s
+++ b/libsrc/cx16/tmcommon.s
@@ -0,0 +1,40 @@
+;
+; 2019-12-27, Greg King
+;
+; Common stuff for the clock routines
+;
+
+        .export         TM, load_jiffy
+
+        .importzp       sreg
+
+
+;----------------------------------------------------------------------------
+; Load .EAX with the approximate number of nanoseconds
+; in one jiffy (1/60th of a second).
+
+.proc   load_jiffy
+
+        lda     #<(17 * 1000 * 1000 / $10000)
+        ldx     #>(17 * 1000 * 1000 / $10000)
+        sta     sreg
+        stx     sreg+1
+        lda     #<(17 * 1000 * 1000)
+        ldx     #>(17 * 1000 * 1000)
+        rts
+
+.endproc
+
+;----------------------------------------------------------------------------
+; TM struct with "is daylight-saving time" set to "unknown"
+.data
+
+TM:     .word   0               ; tm_sec
+        .word   0               ; tm_min
+        .word   0               ; tm_hour
+        .word   0               ; tm_mday
+        .word   0               ; tm_mon
+        .word   0               ; tm_year
+        .word   0               ; tm_wday
+        .word   0               ; tm_yday
+        .word   .loword(-1)     ; tm_isdst