Add blocks to set a buffer variable to use in the SPI block

[greg-norris]

Hello sorry about the delay in getting you the code sample, we talked about Thursday. Where we need blocks added to set a buffer, that is required for the spi blocks to work. You'll notice the code that doesn't have a block in the sample below.

This is the program we are running:
https://makecode.com/_6rCV0i1cbW8Y

We would like use the SPI bus and BrainPad pins to control the LED strips and make various projects.

[pelikhan]

Could you give more details about the missing functionality? Maybe in C++?

[greg-norris]

The work around for the missing block, was to add this code on the JavaScript.

let dummy: Buffer = null
let data: Buffer = null
data = pins.createBuffer(4);
dummy = pins.createBuffer(4);

The program:
https://makecode.com/_6rCV0i1cbW8Y

[pelikhan]

Buffer is currently not supported in blocks. Do you expect the user to set the entire buffer or is this some internal function? If internal, simply author this in JavaScript