Stellaris launchpad 6 PWM channel example

if we assume that you actually want to do something w/these PWM signals - should not you first survey your board - and determine if 6 PWM type GPIO are routed to the edge connectors? 

If not - you can create a somewhat less robust PWM - via the use of the more prevalent Timers - configured into PWM mode.  We've found these to be hugely adequate - although they are not full-fledged PWM Generators - and "sync'ing" is not likely to be as precise.  Believe your odds of finding 6 Timer pins so routed - exceeds that of your PWM pins...

There are code examples w/in the "Examples" folder included w/in StellarisWare.  SW-DRL-UG has code as well. 

While the desire to jump into "deep water" beckons - often getting a single PWM signal to behave properly is a better goal.  You thus have a simple model - which proves to be far easier to extend than getting all 6 channels - up/running - from scratch...

Unfortunately you'll be waiting for a while.  The LM4F120H5QR chip on the launchpad doesn't have PWM generators so you'll need to approximate it like cb1 said and use timers configured in PWM mode.

Hi,

look at this example here: http://www.multiwii.com/forum/viewtopic.php?f=22&t=2376&start=30#p27336

Should be good for 8 PWM channels with 24-bit resolution each.

aBUGSworstnightmare

Greetings our esteemed Bug:

Do realize that neither PWM Generators on LX4F120 (lunchpad) - nor your link - exist - based upon my (moments ago) twice click upon your link!

Request from poster (vendor employee) was to use his "purchased" board - as LX4F120 is so crippled (not a single PWM Generator present) he is reduced to timer generated PWM - as suggested by this reporter in immediate, follow-up post to OP...

Suspect that any "appeal" of lunchpad (i.e. price) would relegate "add on/external - 8 channel, 24 bit res. PWM" to, "never-never land." 

Note that many/most NRND M3's are loitered w/full-fledged PWM Generators - pity that cripple was "selected" for M4 launch/lunch-pad...  (but price was right...)

Here's the link again: http://www.multiwii.com/forum/viewtopic.php?f=22&t=2376&start=30#p27336

You need to scroll down the page a little bit to find the code snippet.

P.S. also fixed the link above.

Update: upon 3rd try - just now - famed link now does appear.  (have not reviewed for content...)

And - once again - link is "dead" w/in No. America.  Do you not agree that 24 bit, 8 Ch device is "bit much" for such ap?

Hi cb1,

strange! Here's what I get when clicking the link:

Don't know what's going on there!

Nevertheless: Anybody interested in this PWM code needs to go to http://www.multiwii.com/forum/ --> scroll down the page and click on BOARDS in the 32bit section of the forum --> choose page 4 of the thread named Stellaris Cortex M4F (preorder for september, 4.99$)

Yep! I'm with you: 24-bit resolution on 8 channels is a 'bit much'; but: It seems to be possible (although I haven't tested it yet myself). 

One should use a scope to verify it.

P.S. A 11bit or 12bit PWM resolution is enough when 'dealing' with digital sevos i.e.