Author Topic: 84+/SE System Clock? (Read 7067 times)

FloppusMaximus · « **Reply #15 on:** January 29, 2011, 12:08:22 am »

Well, if you're only interested in the time of day (not the date), that's relatively easy. Doing it in pure Axe, using only 16-bit math, would be interesting and difficult, but the boot code provides an undocumented routine that you can use to divide a 32-bit number by a 16-bit number. Something like this (untested):

Code: [Select]

Asm(
217884  ; ld hl, OP1
014904  ; ld bc, $0449
0D      ; dec c
EDA2    ; ini
20FB    ; jr nz, $ - 5
113C00  ; ld de, 60
EFB180  ; B_CALL Div32ByDE
)
{e8486}→S ; number of seconds
Asm(
113C00  ; ld de, 60
EFB180  ; B_CALL Div32ByDE
)
{e8486}→M ; number of minutes
Asm(
111800  ; ld de, 24
EFB180  ; B_CALL Div32ByDE
)
{e8486}→H ; number of hours

would obtain the hours, minutes, and seconds since midnight; I'll let somebody else figure out how to turn that into a string.

ferox · « **Reply #16 on:** January 31, 2011, 12:31:18 am »

Quote from: Broseph Radson on January 28, 2011, 12:02:43 pm

Im trying to do something like the Basic GetTimeStr(12)

i do know a BASIC syntax for this:

Code: [Select]

getTime->L1

this stores the hours into L1(1) mins into L1(2) and secs into L1(3)
btw, it only knows 24 hours, no AM or PM display

calcdude84se · « **Reply #17 on:** February 01, 2011, 08:40:33 pm »

Sadly, he's looking for Axe code. That'd work for BASIC, though

Floppus, nice! Didn't know about that bcall

thepenguin77 · « **Reply #18 on:** February 01, 2011, 08:54:07 pm »

Quote from: ferox on January 31, 2011, 12:31:18 am

i do know a BASIC syntax for this:

Code: [Select]
getTime->L1

And just like almost every basic command, it has a bcall counter part. bcall(_getTime) puts seconds, minutes, and hours all on the floating point stack. The method of retrieval can vary, but there are two distinct strategies. Pop and grab each one through op1, or pop them consecutively into op1 2 and 3.

So, method 1:

Code: [Select]

EF5B51 EF9043 grab OP1 seconds EF9043 grab OP1 minutes EF9043 grab OP1 hours

And method 2:

Code: [Select]

EF5B51 EF9043 EF8D43 EF8A43 OP1 = secs OP2 = minutes OP3 = hours

Just remember that those answers are TI floating point. So you'll have to convert them.

calcdude84se · « **Reply #19 on:** February 01, 2011, 09:00:09 pm »

Axe has float{ for that (converting from TI FP), so your method will work too

Author Topic: 84+/SE System Clock? (Read 7067 times)

FloppusMaximus

Re: 84+/SE System Clock?

ferox

Re: 84+/SE System Clock?

calcdude84se

Re: 84+/SE System Clock?

thepenguin77

Re: 84+/SE System Clock?

calcdude84se

Re: 84+/SE System Clock?