setting values and percentages

[Scampy]

Bit of a fudge, but it works well enough

'*******************************************************************************
' Set Brightness levels for each channel


brightness:

B_max = (4095/100)*maxbright

Lcdout $FE,2
LCDOUT $FE,$80,"Set Max Brightness"
IF H_butt = 0 THEN GOSUB up
IF M_butt = 0 THEN GOSUB down

If maxbright  = 100 then
LCDOUT $FE,$C0,"Channel 1 "
LCDOut $FE,$D4,#maxbright,"%"
endif

If maxbright  =0 or maxbright <10 then
LCDOUT$FE,$C0,"Channel 1 "
LCDOut $FE,$D4,dec1 maxbright,"% "
endif

if maxbright >=10 and maxbright <100 then
LCDOUT$FE,$C0,"Channel 1 "
LCDOut $FE,$D4,dec2 maxbright,"%   "
endif
     
If S_butt = 0 then
    pause 100 
    goto brightness2
endif 
goto brightness



brightness2: 
 
W_max = (4095/100)*maxbright

Lcdout $FE,2
LCDOUT $FE,$80,"Set Max Brightness"
IF H_butt = 0 THEN GOSUB up
IF M_butt = 0 THEN GOSUB down

If maxbright  = 100 then
LCDOUT $FE,$C0,"Channel 2 "
LCDOut $FE,$D4,#maxbright,"%"
endif

If maxbright  =0 or maxbright <10 then
LCDOUT$FE,$C0,"Channel 2 "
LCDOut $FE,$D4,dec1 maxbright,"% "
endif

if maxbright >=10 and maxbright <100 then
LCDOUT$FE,$C0,"Channel 2 "
LCDOut $FE,$D4,dec2 maxbright,"%   "
endif

pause 200
If S_butt = 0 then
    pause 100 
    LCDOUT $FE,1   
    goto mainmenu
endif
goto brightness2

up:
    maxbright = maxbright + 1
    IF maxbright >= 100 THEN maxbright = 100
    pause 250
RETURN
down:
    maxbright = maxbright - 1
    IF maxbright <= 0 THEN maxbright = 0
    pause 250
RETURN

Again, the lack of floating point maths in PBP means the calculations are not exact, but this way every 1% increment equals a block of 41 steps on the PCA chip, so 50% brightness = 2050 but that's close enough to the 2047 is should be and to be honest I doubt if the human eye could distinguish the difference

[HenrikOlsson]

Hi,
If it works it works.
If you want it a little better PWMValue = Percentage */ 10483 will give you 2047 at 50%.

/Henrik.

[Scampy]

So using my variables B_max = (4095/100)*maxbright would that be

B_max = maxbright */10483

Nope - that don't work

[HenrikOlsson]

If B_Max is the value you send to the PWM controller (0-4095) and maxbright is the percentage value (0-100) as entered by the user then yes.
Actually, at 100% it'll give you 4094 so make that B_max = maxbright */10484 instead.

/Henrik.

[Scampy]

If B_Max is the value you send to the PWM controller (0-4095) and maxbright is the percentage value (0-100) as entered by the user then yes.
Actually, at 100% it'll give you 4094 so make that B_max = maxbright */10484 instead.

/Henrik.

Yes - B_max and W_max are the values that are sent to the PCA chip (0 - 4095). And maxbright has a value between 0 and 100 as you assumed. But using that line of code the values for B_max and W_max do not change from the pre-programmed default of 4095 after the menu option is used to change the max brightness level

[HenrikOlsson]

Hi,
Strange..... I tested the following code

HSEROUT["Program start",13]
For i = 0 to 5
    Lookup2 i,[1, 10, 25, 50, 75, 100], maxbright
    B_max = maxbright */ 10484
    HSEROUT ["Maxbright: ", DEC3 maxbright, "     B_Max: ", DEC4 B_max, 13]
NEXT

And got the following results:

Program start
Maxbright: 001     B_Max: 0040
Maxbright: 010     B_Max: 0409
Maxbright: 025     B_Max: 1023
Maxbright: 050     B_Max: 2047
Maxbright: 075     B_Max: 3071
Maxbright: 100     B_Max: 4095

Seems to work fine here....

/Henrik.

[EarlyBird2]

the values for B_max and W_max do not change from the pre-programmed default of 4095 after the menu option is used to change the max brightness level

Is the default of 4095 inside the main loop and resetting B_max and W_max after the menu option returns to the main loop.

[Scampy]

Don't know what happened to my post last night, but I found out why it was doing that - It was one of those oversights caused through hours of programming without a break. The menu option saved all the changes when exiting from the menu to the main program, so unless this action was performed all the changes were lost if you remained in the menu section as the diagnostics option reads the values stored in memory and thus read the defaults and over wrote them. This was changed so each section of the menu now writes the new values to memory when exiting the option and reverting back to the menu screen, so switching between menu options and then the diagnostics means that the changes made in any of the other menu sections are read back in.

One thing I would like to know is what the */ function means