Propeller Manual

Table Of Contents

3: Assembly Language Reference

Propeller Manual v1.1 · Page 239

Here's an example Propeller object. Its Spin code in the PUB block, Main, launches another

cog to run the

DAT block's Propeller Assembly routine, T Toggle.

CON

_clkmode = xtal1 + pll16x

_xinfreq = 5_000_000

PUB Main

{Launch cog to toggle P16 endlessly}

cognew(@Toggle, 0) 'Launch new cog

DAT

{Toggle P16}

org 0 'Begin at Cog RAM addr 0

Toggle mov dira, Pin 'Set Pin to output

mov Time, cnt 'Calculate delay time

add Time, #9 'Set minimum delay here

:loop waitcnt Time, Delay 'Wait

xor outa, Pin 'Toggle Pin

jmp #:loop 'Loop endlessly

Pin long |< 16 'Pin number

Delay long 6_000_000 'Clock cycles to delay

Time res 1 'System Counter Workspace

When the Main method's COGNEW command is executed, a new cog begins filling its Cog RAM

with 496 consecutive longs from Main Memory, starting with the instruction at the address of

Toggle. Afterwards, the new cog initializes its special purpose registers and begins executing

the code starting at Cog RAM register 0.

Both assembly and data may be intermixed within this

DAT block but care should be taken to

arrange it such that all critical elements are loaded into the cog in the proper order for

execution. It is recommended to write it in the following order: 1) assembly code, 2)

initialized symbolic data (i.e.:

LONGs), 3) reserved symbolic memory (i.e.: RESs). This causes

the cog to load up the assembly code first, followed immediately by initialized data, and any