Avr

Avr is the root class (the Controller). Die Property „Device“ must be declared before all others.

Property (write only)
Name Description Value
Avr.Device=Controllername selects controller class 1) Name
Avr.Clock=Constant Clock rate in Hz 2) > 0
Avr.Stack=Constant Stack size in Byte. > 1
Avr.Isr.<InterruptAdr>=Isr-Label Define the Interrupt service routine.3) Address
Avr.CodeStartAddr=Address Start address of the code, e.g. for Bootloader „avr.CodeStartAddr = LARGEBOOTSTART“. This will write the machine code to the specifies address in memory. Address (Word oriented)
Property (read only)
Name Description Type
Result = Avr.StackPointer Current stack pointer position word
Property (read/write)
Name Description Type
Avr.<Portname> Direct access to all ports. byte
Avr.<Portname>.<Bit> Direct access to the bits of the specified port. byte
Method
Name Description
Avr.Interrupts.enable Enable global interrupts ON
Avr.Interrupts.disable Disable global interrupts OFF
Avr.Idle will call Idle-Event if available.

Example

avr.device = atmega32 // Atmega32
avr.clock = 8000000   // 8 Mhz clock rate
avr.stack = 32        // 32 Byte program stack
// Program code

Stack-Size

The required stack size depends on the number of parameters and local variables and cascading level of method calls. Cascaded calls add their number of required byte. A method requires at least 2 byte (Return address). Parametera and declared variables come on top.

Controller-Ports and -Constants

Besides using ojects and functions, you may also access the ports directly (same as in C/Assembler). All controller specific Bit names or properties of the specific port are defined. Luna-IDE will highlight correctly written and existent names. Ports and names of the avr.device-Properties will be updated when loading or saving the source code.

Usage

Generally speaking:

  • Without specifying the class name „Avr“, all ports and constants defined by the manufacturer will be understood as constants
  • When specifying the class name „Avr“, all ports and constants will be interpreted as variables (read and write). Controller constants will be interpreted as normal constants. See the product datasheet or IDE to know what are ports or constants.

Syntax

value = avr.SREG        'default data type is byte
avr.TCNT1.Word = value  'define word access (write)
value = avr.TCNT1.Word  '(read)

See also: ermitteln_von_controllerspezifischen_werten_und_konstanten

Example

avr.device = atmega32 // Atmega32
avr.clock = 8000000   // 8 Mhz clock rate
avr.stack = 32        // 32 Byte program stack
 
dim a as word
dim b as byte
 
avr.TIMSK = 1<<TOIE1 or 1<<OCIE1A      ' Activate Timer 1 and Compare1A
a.LowByte = avr.TCNT1L                 ' Read Low Byte of timer counter
a.HighByte = avr.TCNT1H                ' Read High Byte of timer counter
 
avr.TCNT1H = a.HighByte                ' Write High-Byte of timer counter (when writing, always High byte first!)
avr.TCNT1L = a.LowByte                 ' Write Low-Byte of timer counter
avr.DDRA.PINA0 = 1
b = avr.PORTA.PINA0
avr.Isr.ICP1Addr = myIsr
 
do
loop
 
isr myIsr
 [..]
endisr
1) Avr.Device can also be read and will return as string constant
2) Setting this property does not modify the actual clock rate, instead it defines the value for subsequential read functions
3) InterrupAdr is the hardware interrupt address in the controller's interrupt vector, e.g. ICP1Addr.