[ASM/AXE | SNIPPET] Get time and Get date from the 84+ RTC
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  • [ASM/AXE | SNIPPET] Get time and Get date from the 84+ RTC
  • 21 Jan 2015 11:23:44 am
  • Last edited by Muessigb on 21 Jan 2015 03:15:03 pm; edited 7 times in total
Time
This code snippet copies the time into L1;
Order: Seconds, Minutes, Hours

Assembly:

Code:
#include    "ti83plus.inc"
    bcall($515B) ; TI-OS getTime function (stores on the floating point stack)
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen),de ; Load the contents of DE into {L1}
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen + 1),de ; Load the contents of DE into {L1}
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen + 2),de ; Load the contents of DE into {L1}


Axe:

Code:
Asm(EF5B51EF9043EFEF4AED53EC86EF9043EFEF4AED53ED86EF9043EFEF4AED53EE86)



Date
This code snippet copies the time into L1;
Order: Day, Month, (Year?)

Assembly:

Code:
#include    "ti83plus.inc"
    bcall($514F) ; TI-OS getDate function (stores on the floating point stack)
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen),de ; Load the contents of DE into {L1}
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen + 1),de ; Load the contents of DE into {L1}
    bcall(_PopRealO1) ; Pop a real from the FPS to OP1
    bcall(_ConvOP1) ; Convert OP1 to DE registers (and A LSB)
    ld (saveSScreen + 2),de ; Load the contents of DE into {L1}


Axe:

Code:
Asm(EF4F51EF9043EFEF4AED53EC86EF9043EFEF4AED53ED86EF9043EFEF4AED53EE86)



Licence
Name me in the credits or the readme if you want. I'd be happy if you do so, but its really optional. The code is without any warranty. Use it at your own risk.
You use ports 45h through 48h to read the current value of the clock, ports 41h through 44h to set the current value of the clock, and port 40h to turn the clock on and off. With these porst, you can get the clock value to within an accuracy of one second. If you need a more precise timer, you should consider looking at the crystal timers, but note that the TI-83 Plus does not offer these ports.
If you want a routine that just gets the string of data of the current time, I might look at this: http://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:515E. Of course, reading from the ports works as well, but this might simplify things...
  
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[ASM/AXE | SNIPPET] Get time and Get date from the 84+ RTC
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