User manual

mikroPascal PRO for dsPIC30/33 and PIC24

MikroElektronika

379

Manchester Code Library

The mikroPascal PRO for dsPIC30/33 and PIC24 provides a library for handling Manchester coded signals. The

Manchester code is a code in which data and clock signals are combined to form a single self-synchronizing data

stream; each encoded bit contains a transition at the midpoint of a bit period, the direction of transition determines

whether the bit is 0 or 1; the second half is the true bit value and the rst half is the complement of the true bit value

(as shown in the gure below).

Important:

- The Manchester receive routines are blocking calls (Man_Receive_Init and Man_Synchro). This means that

MCU will wait until the task has been performed (e.g. byte is received, synchronization achieved, etc).

- Manchester code library implements time-based activities, so interrupts need to be disabled when using it.

The following variables must be dened in all

projects using Manchester Code Library:

Description: Example:

var MANRXPIN : sbit; sfr; external;

Receive line.

var MANRXPIN : sbit at RF0_bit;

var MANTXPIN : sbit; sfr; external;

Transmit line.

var MANTXPIN : sbit at LATF1_bit;

var MANRXPIN_Direction : sbit; sfr;

external;

Direction of the Receive pin.

var MANRXPIN_Direction : sbit at

TRISF0_bit;

var MANTXPIN_Direction : sbit; sfr;

external;

Direction of the Transmit

pin.

var MANTXPIN_Direction : sbit at

TRISF1_bit;

External dependencies of Manchester Code Library