RC5SEND

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Action

Sends RC5 remote code.

 

 

Syntax

RC5SEND togglebit, address, command

 

 

Uses

TIMER1

 

 

Remarks

Togglebit

Make the toggle bit 0 or 32 to set the toggle bit

Address

The RC5 address

Command

The RC5 command.

 

The resistor must be connected to the OC1A pin. In the example a 2313 micro was used. This micro has pin portB.3 connected to OC1A.

Look in a data sheet for the proper pin when used with a different chip.

 

 

Most audio and video systems are equipped with an infra-red remote control.

The RC5 code is a 14-bit word bi-phase coded signal.

The two first bits are start bits, always having the value 1.

The next bit is a control bit or toggle bit, which is inverted every time a button is pressed on the remote control transmitter.

Five system bits hold the system address so that only the right system responds to the code.

 

Usually, TV sets have the system address 0, VCRs the address 5 and so on. The command sequence is six bits long, allowing up to 64 different commands per address.

 

The bits are transmitted in bi-phase code (also known as Manchester code).

An IR booster circuit is shown below:

 

IRBOOST

 

 

 

See also

CONFIG RC5 , GETRC5 , RC6SEND

 

 

Example

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

'name                     : sendrc5.bas

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

'purpose                  : code based on application note from Ger Langezaal

'micro                    : AT90S2313

'suited for demo          : yes

'commercial addon needed  : no

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

 

$regfile = "2313def.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

 

'   +5V <---[A Led K]---[220 Ohm]---> Pb.3 for 2313.

' RC5SEND is using TIMER1, no interrupts are used

' The resistor must be connected to the OC1(A) pin , in this case PB.3

 

Dim Togbit As Byte , Command As Byte , Address As Byte

 

Command = 12                                               ' power on off

Togbit = 0                                                 ' make it 0 or 32 to set the toggle bit

Address = 0

Do

Waitms 500

Rc5send Togbit , Address , Command

'or use the extended RC5 send code. You can not use both

'make sure that the MS bit is set to 1, so you need to send

'&B10000000 this is the minimal requirement

'&B11000000 this is the normal RC5 mode

'&B10100000 here the toggle bit is set

' Rc5sendext &B11000000 , Address , Command

Loop

End