Support for 74C595A Serial to Parallel Register

[Yuki Sato]

This is from GitHub issue

I was wondering if you could add support for the 74HC595A Serial Shift Register.
https://www.onsemi.com/pub/Collateral/MC74HC595A-D.PDF

I currently use these chips to expand the number of outputs available.
Normally only need to use Data/Latch/Clock, but Output Enable also useful to make sure all outputs off when first powered on and setup.

[Yuki Sato]

@kabongsteve It's OK! working perfectly is better. I was wondering why there are difference.

I deployed obniz.js 1.7.1
It include new wired property "enabled". you can opt out final this.io_oe.output(false) with supplying enabled:false. See more detail on document.

if (!this.io_oe && enable == false) is to show more user friendly error message.
Without this, It will throw error because io_oe doesn't exist.
But the error message is not friendly.
So I'm manually handling it.

Thank you.

[Kabong]

thanks,

My comment on Jul 8th stated that I had gotten it working, and had some other suggestions.

But basically its completed and can be closed