SPIIN

SPIIN

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Action

Reads a value from the SPI-bus.

 

 

Syntax

SPIIN var, bytes

 

 

Syntax SPI1

SP1IIN var, bytes  

 

 

Remarks

Var

The variable which receives the value read from the SPI-bus.

Bytes

The number of bytes to read. The maximum is 255.

 

In order to be able to read data from the SPI slave, the master need to send some data first. The master will send the value 0.

SPI is a 16 bit shift register. Thus writing 1 byte will cause 1 byte to be clocked out of the device which the SPIIN will read.

 

 

 

See also

SPIOUT, SPIINIT, CONFIG SPI , SPIMOVE , SPI1

 

 

 

Example

'-----------------------------------------------------------------------------------------

'name                     : spi.bas

'copyright                : (c) 1995-2005, MCS Electronics

'purpose                  : demo :SPI

'micro                    : Mega48

'suited for demo          : yes

'commercial addon needed  : no

'-----------------------------------------------------------------------------------------

 

$regfile = "m48def.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 B As Byte

Dim A(10) As Byte

 

Spiinit

B = 5

Spiout A(1) , B

 

Spiin A(1) , B

 

A(1) = Spimove(a(2))

End