INP/de

= (**COPIED FROM ENGLISH PAGE**) === Action

Returns a byte read from a hardware port or any internal or external memory location.

 

 

Syntax

var = INP(address)

 

 

Remarks

var	Numeric variable that receives the value.
address	The address where to read the value from. (0- &HFFFF) For Xmega which supports huge memory, the address is in range from 0-&HFFFFFF.

 

The PEEK() function will read only the lowest 32 memory locations (registers).

The INP() function can read from any memory location since the AVR has a linear memory model.

 

When you want to read from XRAM memory you must enable external memory access in the Compiler Chip Options.

 

 

See also

OUT , PEEK , POKE, SETREG, GETREG

 

 

Example

'-----------------------------------------------------------------------------------------
'name : peek.bas
'copyright : (c) 1995-2005, MCS Electronics
'purpose : demonstrates PEEk, POKE, CPEEK, INP and OUT
'micro : Mega162
'suited for demo : yes
'commercial addon needed : no
'-----------------------------------------------------------------------------------------
 
$regfile = "m162def.dat" ' specify the used micro
$crystal = 4000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 32 ' default use 32 for the hardware stack
$swstack = 10 ' default use 10 for the SW stack
$framesize = 40 ' default use 40 for the frame space
 
Dim I As Integer , B1 As Byte
'dump internal memory
For I = 0 To 31 'only 32 registers in AVR
B1 = Peek(i) 'get byte from internal memory
Print Hex(b1) ; " ";
'Poke I , 1 'write a value into memory
Next
Print 'new line
'be careful when writing into internal memory !!
 
'now dump a part ofthe code-memory(program)
For I = 0 To 255
B1 = Cpeek(i) 'get byte from internal memory
Print Hex(b1) ; " ";
Next
'note that you can not write into codememory!!
 
Out &H8000 , 1 'write 1 into XRAM at address 8000
B1 = Inp(&H8000) 'return value from XRAM
Print B1
End

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