Heres a way of controlling 8 LEDs connected to one PORT, some of this code was from digital-diy.com but I made it so it controlled 8 leds and added more functions, the code might not be very efficient but its works and it would make a great lighting effect if you was to make Led arrays from it.
Code:
Device = 18F4550 // this is what microchip we are using
Clock = 48 // makes the micro work at 12 million instructions per sec (using a 20mhz crystal)
Config PLLDIV = 5, // configure PPL and our OSC settings
CPUDIV = OSC1_PLL2,
USBDIV = 2,
FOSC = HSPLL_HS
Include "RandGen.bas" // this module will give us a random numbers between 0 - 255
// Our Variables
Dim TMR2IE As PIE1.1, // TMR2 interrupt enable
TMR2IF As PIR1.1, // TMR2 overflow flag
TMR2ON As T2CON.2, // Enables TMR2 to begin incrementing
Signal_Pin As PORTD.0 // Signal output to frequency meter (debugging)
Dim one_Pin As PORTB.0, // Out control pins...
two_Pin As PORTB.1,
three_Pin As PORTB.2,
four_Pin As PORTB.3,
five_Pin As PORTB.4,
six_Pin As PORTB.5,
seven_Pin As PORTB.6,
eight_Pin As PORTB.7
Dim one_Duty As Byte, // user pwm control
two_Duty As Byte,
three_Duty As Byte,
four_Duty As Byte,
five_Duty As Byte,
six_Duty As Byte,
seven_Duty As Byte,
eight_Duty As Byte,
all_Duty As Byte,
one_DutyVal As Byte,
two_DutyVal As Byte,
three_DutyVal As Byte,
four_DutyVal As Byte,
five_DutyVal As Byte,
six_DutyVal As Byte,
seven_DutyVal As Byte,
eight_DutyVal As Byte,
all_DutyVal As Byte,
RandomVal As Byte // used to store the random number
Dim uS As Word,
mS As Word
// Our Interrupt Routine
Interrupt TMR2_Interrupt()
High(Signal_Pin) // used for debugging
Save(0) // Back up system variables
If TMR2IF = 1 Then // Check if the interrupt was from TMR2
TMR2IF = 0 // Clear the TMR2 interrupt flag
uS = uS + 50
If uS >= 1000 Then
uS = uS - 1000
Inc(mS)
EndIf
Inc(one_DutyVal)
Inc(two_DutyVal)
Inc(three_DutyVal)
Inc(four_DutyVal)
Inc(five_DutyVal)
Inc(six_DutyVal)
Inc(seven_DutyVal)
Inc(eight_DutyVal)
Inc(all_DutyVal)
If one_DutyVal > one_Duty Or one_Duty = 0 Then
one_Pin = 0
Else
one_Pin = 1
EndIf
If two_DutyVal > two_Duty Or two_Duty = 0 Then
two_Pin = 0
Else
two_Pin = 1
EndIf
If three_DutyVal > three_Duty Or three_Duty = 0 Then
three_Pin = 0
Else
three_Pin = 1
EndIf
If four_DutyVal > four_Duty Or four_Duty = 0 Then
four_Pin = 0
Else
four_Pin = 1
EndIf
If five_DutyVal > five_Duty Or five_Duty = 0 Then
five_Pin = 0
Else
five_Pin = 1
EndIf
If six_DutyVal > six_Duty Or six_Duty = 0 Then
six_Pin = 0
Else
six_Pin = 1
EndIf
If seven_DutyVal > seven_Duty Or seven_Duty = 0 Then
seven_Pin = 0
Else
seven_Pin = 1
EndIf
If eight_DutyVal > eight_Duty Or eight_Duty = 0 Then
eight_Pin = 0
Else
eight_Pin = 1
EndIf
If all_DutyVal > all_Duty Or all_Duty = 0 Then
Toggle (Signal_Pin) // used for debugging or can be
Else
one_Pin = 1
two_Pin = 1
three_Pin = 1
four_Pin = 1
five_Pin = 1
six_Pin = 1
seven_Pin = 1
eight_Pin = 1
EndIf
EndIf
Restore // Restore system variables
Low(Signal_Pin) // used for debugging
End Interrupt
// Our Timer2 setup
Private Sub TMR2_Initialize() // setting up TMR2 for a 15micro-sec interrupt
TMR2ON = 0 // Disable TMR2
TMR2IE = 0 // Turn off TMR2 interrupts
PR2 = 149 // TMR2 Period register PR2
T2CON = %00000001 // T2CON 0:1 = Prescale
// 00 = Prescale is 1:1
// 01 = Prescale is 1:4
// 1x = Prescale is 1:16
// 3:6 = Postscale
// 0000 = 1:1 postscale
// 0001 = 1:2 postscale
// 0010 = 1:3 postscale...
// 1111 = 1:16 postscale
TMR2 = 0 // Reset TMR2 Value
TMR2IE = 1 // Enable TMR2 interrupts
TMR2ON = 1 // Enable TMR2 to increment
Enable(TMR2_Interrupt)
End Sub
// Our Initializations
Low(one_Pin)
Low(two_Pin)
Low(three_Pin)
Low(four_Pin)
Low(five_Pin)
Low(six_Pin)
Low(seven_Pin)
Low(eight_Pin)
one_Duty = 0
two_Duty = 0
three_Duty = 0
four_Duty = 0
five_Duty = 0
six_Duty = 0
seven_Duty = 0
eight_Duty = 0
all_Duty = 0
one_DutyVal = 0
two_DutyVal = 0
three_DutyVal = 0
four_DutyVal = 0
five_DutyVal = 0
six_DutyVal = 0
seven_DutyVal = 0
eight_DutyVal = 0
all_DutyVal = 0
uS = 0
mS = 0
RandGen.Initialize(128) // Initialize the Random Number generator (set to 128 but can be changed)
TMR2_Initialize // Setup and enable TMR2
// Start Of Program...
While True // Create an infinite loop
RandomVal = RandGen.Rand // Grab a random number from 0 to 255
Select RandomVal // Find out what colour to increase/decrease
// Led One
Case 0 To 15
While one_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(one_Duty)
Wend
// Led Two
Case 31 To 46
While two_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(two_Duty)
Wend
// Led Three
Case 62 To 77
While three_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(three_Duty)
Wend
// Led Four
Case 93 To 108
While four_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(four_Duty)
Wend
// Led Five
Case 124 To 139
While five_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(five_Duty)
Wend
// Led Six
Case 155 To 170
While six_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(six_Duty)
Wend
// Led Seven
Case 186 To 202
While seven_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(seven_Duty)
Wend
// Led Eight
Case 218 To 233
While eight_Duty <255> 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(eight_Duty)
Wend
// All Leds
Case 250 To 255 // if we come here then all leds slowly dim (one by one)
If (PORTB.0) = 1 Then
While one_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(one_Duty)
Wend
EndIf
If (PORTB.1) = 1 Then
While two_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(two_Duty)
Wend
EndIf
If (PORTB.2) = 1 Then
While three_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(three_Duty)
Wend
EndIf
If (PORTB.3) = 1 Then
While four_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(four_Duty)
Wend
EndIf
If (PORTB.4) = 1 Then
While five_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(five_Duty)
Wend
EndIf
If (PORTB.5) = 1 Then
While six_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(six_Duty)
Wend
EndIf
If (PORTB.6) = 1 Then
While seven_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(seven_Duty)
Wend
EndIf
If (PORTB.7) = 1 Then
While eight_Duty > 0
mS = 0
Repeat
Until mS = 19 // this it the time it takes for the led to get to full dim
Dec(eight_Duty)
Wend
EndIf
// now we turn on all leds to full brightness and then dim them
DelayMS(100)
While all_Duty <255> 0
mS = 0
Repeat
Until mS = 22 // this it the time it takes for the led to get to full dim
Dec(all_Duty)
Wend
End Select
Wend
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