Alternative RC5 receiver

[Jan Lichtenbelt]

I made an alternative RC5 receiver on one of the PortB selected.

Principal:
1) Detect the period time for 1 bit (about 1900 usec)
2) Synchronise on the level change half way each bit
3) Read input status directly after this half-way pulse
4) Wait 3/4 of a period to start at 2)
5) Repeat for 12 bits with:
Toggle (1 bit), Address (5 bits) and Command (6 bits)

Interrupts used:
1) Timer2 (76800 Hz / 13 usec),
but any other timer fits which measure the 900 usec accurate enough
2) Interrupt On Change (IOC) on portB on any change (positive and negative)
In this version port B0, but all other ports can be used
(change the IOC interrupt and inputs of port B0)

Remark:
1. There are no requirements for the chip oscillator frequency
2. Flowcode V6 version fails due to the fact that the rollover (pr2 register) of Time 2 can not be changed (is fixed to 256 and should be 64)

Have fun

Jan Lichtenbelt

PS. With an additional C-code, the Flowcode V6 version works now also

[Benj]

Hi Jan,

Cheers for the post looks like a great project

It looks like the import from v5 to v6 is loosing the timer rollover value in the interrupt properties. I have checked and once you reset the value in the properties the C code being generated seems to be correct. I will see if this is something we can fix for the next release.