By Shane Avery

ISBN-10: 0071664505

ISBN-13: 9780071664509

ISBN-10: 0071664513

ISBN-13: 9780071664517

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What happens when you change both occurrences of [16] to [17]? How about setting outa to 0 instead of 1? A Blinking LED Admittedly, our first example is an expensive alternative to a simple wire and light, but now you know a way to control the Propeller’s I/O pins! Here’s a more exciting example using the techniques we learned, plus a little more. ✓ Create a new application with the following code. Tip: Press Ctrl+N to start with a fresh edit pane. PUB LED_Blink dira[16] := 1 repeat outa[16] := 1 waitcnt(clkfreq + cnt) outa[16] := 0 waitcnt(clkfreq + cnt) 'Set I/O pin 16 to output direction 'Loop endlessly...

Init statement, is the actual name of our reserved stack space for the LED_Flash method. 2. Init statement, is the actual number of longs we reserved for LED_Flash’s stack space. 3. The Start statement contains valid parameters to our Flash object’s Start method. 4. The waitcnt statement waits long enough for our LED_Flash method to be fully exercised (at least one iteration of its repeat loop). RUNNING THE STACK TEST Now it’s time to run the test. The Stack Length object outputs its result serially on the Propeller’s programming port.

If you want to learn even more, load the Stack Length object itself and read its top comments and its “Theory of Operation” section. We’ll use the Stack Length Demo object as a template for our test. }} if Cog cogstop(Cog~ - 1) 'Did we start a cog? ' If so, stop it SIZING THE STACK 43 PRI LED_Flash(Pin, Duration, Count) {Flash led on PIN for Duration a total of Count times. outa[Pin] waitcnt(Duration + cnt) 'Loop Count * 2 times... spin. Note that we carefully checked and modified the code in the temporary TestStack method so that: 1.

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Programming and Customizing the Multicore Propeller Microcontroller by Shane Avery


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