Addressing multiple PORTs using one Variable

[richard]

try this 16 led strip on RC7

' PIC 16F690 @20MHz
#CONFIG
    __config _FCMEN_OFF &_IESO_OFF &_CPD_OFF &_WDT_OFF &_HS_OSC &_BOR_OFF &_CP_OFF &_PWRTE_OFF &_MCLRE_OFF
#ENDCONFIG
CLEAR
TRISC = %00000000


DEFINE OSC 20
pinsel  var byte 
RED  var byte 
GREEN  var byte
BLUE var byte
px      var byte 
bt      var byte 
pc      var byte 
pinsel   = 128








MAIN:
GREEN=128


asm
        MOVLW 16
        MOVWF _pc
_nxRby        
        MOVF  _GREEN,W
        movwf _px
        MOVLW 8
        movwf _bt
        RLF _px,F
_nxRbt  movf _pinsel,W
        IORWF PORTC ,F
        BTFSS STATUS,C
        GOTO XXR
        NOP
        NOP
        NOP
        
XXR     CLRF PORTC  
        NOP
        RLF _px,F
        DECFSZ _bt,F
        GOTO _nxRbt
        MOVF  _RED,W
        movwf _px
        MOVLW 8
        movwf _bt
        RLF _px,F
_nxGbt  movf _pinsel,W
        IORWF PORTC,F
        BTFSS STATUS,C
        GOTO XXG
        NOP
        NOP
        NOP
        
XXG     CLRF PORTC  
        NOP
        RLF _px,F
        DECFSZ _bt,F
        GOTO _nxGbt
        MOVF  _BLUE,W
        movwf _px
        MOVLW 8
        movwf _bt
        RLF _px,F
_nxBbt  movf _pinsel,W
        IORWF PORTC  ,F
        BTFSS STATUS,C
        GOTO XXB
        NOP
        NOP
        NOP
        
XXB     CLRF PORTC  
        NOP
        RLF _px,F
        DECFSZ _bt,F
        GOTO _nxBbt
        DECFSZ _pc,F
        GOTO _nxRby
        
   
endasm  
 PAUSE 100




GOTO MAIN

[flotulopex]

Here's the link for the video again.



Sorry, I'm not the YouTube expert so I hope it works now

[flotulopex]

try this 16 led strip on RC7

Thank a lot Richard. I'll give it a try

[richard]

I take it that's a fail. I'm not surprised, the simulator indicated that @20mHz a pic16f690 cannot to a conditional branch quickly enough for a "LOW" pulse for a ws2812

[Ioannis]

Now, that is a surprise to me. This is a simple task for a simulator to calculate. It knows clock rate, instruction cycle, why does it fail to make simple calculations?

Ioannis

[richard]

Now, that is a surprise to me. This is a simple task for a simulator to calculate. It knows clock rate, instruction cycle, why does it fail to make simple calculations?

the simulator correctly indicated that the code will not work right from the start, the TOH is just out of spec

the code provided was to hopefully prove the outcome one way or the other in real life.
i assume it failed since roger never replied and then went on to ask pic18 questions

[flotulopex]

I finally made the proto with 5 µC: 1 master and 4 slaves....

Anyway, thanks a lot to all for your help

[flotulopex]

And this is how it looks like for now.