Hi there, I’m trying to make my first Arduino project with the Spark Core. I picked making a universal IR remote that Instructables has on their website. I’m trying to compile their IR_RECEIVE.ino which includes using raw pin reading methods. When I’ve changed line 19 to #define IRpin_PIN PIN…

PINB is the arduino’s input pins register using direct port manipulation. you need to rejigger the code for Spark Core… I’m not familiar with accessing Spark Core’s port registers, but I’ll keep an eye on this thread.

It’s not anything obvious that would be in the pinout diagram , right?

digitalRead() is a macro, so it runs slower than using Direct Port Manipulation, you can see the notes in his code: // while (digitalRead(IRpin)) { // this is too slow! while (IRpin_PIN & (1 << IRpin)) { Since the Spark is a faster processor, try using digitalRead() by just changing his code …

There is more here regarding the topic… ways that may work for you. [image] Spark Core Execution Speed I’ve been wondering exactly how fast the Spark Core sketches will run. Since the STM32 is running at 72MHz right? I thought it should be blazing away… I was hoping that it would at le…

While the speed thing is true and digitalRead is plenty fast, there is a port read too. e.g. In the pinout diagram you see D0 equals PB7 so it’s located on GPIOB port bit 7. So when your pins are setup for digital read you could do int portb = GPIOB->IDR; to obtain all 16 bits of port B an pick o…

Thanks guys, super helpful stuff. I’ll try this and report back.

[image] BulldogLowell: digitalRead() is a macro, BTW in Spark world digitalRead() is not a macro but a function. If you want to know why it is so much slower than direct port access you can have a look in the Open Source files

[image] ScruffR: If you want to know why it is so much slower than direct port access Yes, I understood that, thanks. It seems it is not as friendly on Spark, coming from Arduino. Also not a lot of examples here, yet.

[image] BulldogLowell: Yes, I understood that, thanks. It seems it is not as friendly on Spark Sorry, if I came across wrong - I didn't mean to be clever :wink: This comment was mainly meant for @KlooShanko to show where to find some morw background info.

Can I use raw pin reading methods with the Spark Core?

Getting Started

BulldogLowell January 19, 2015, 10:13pm 5

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Can I use raw pin reading methods with the Spark Core?

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