StateMachine ASM Change Pin

[DoofyAss]

How can I change pin?

this.asm = new ASM({ sideset: 1 })

this.sm = new StateMachine(
StateMachine.getAvailableId(), this.asm, {

	freq: 8000000,
	pullThreshold: 24,
	autopull: true,
	sidesetBase: this.pin,
	fifoJoin: PIO.FIFO_JOIN_TX,
	outShiftDir: PIO.SHIFT_LEFT,
})

How does work this.sm.setPins()?

[communix]

this.sm.setPins() function is the same as pio_sm_set_pins_with_mask() function of Raspberrypi-pico API. Please refer this function.

void pio_sm_set_pins_with_mask (PIO pio, uint sm, uint32_t pin_values, uint32_t pin_mask)

Use a state machine to set a value on multiple pins for the PIO instance.

[DoofyAss]

Is it possible set multiple pins for multiple led strips?
I was trying change pins after create a sm object.

this.sm.setPins(1 | 2)

did not produce results.

[communix]

this.sm.setPins(1 | 2 ) is the same as this.sm.setPins( 3, 0xFFFFFFFF) because the default value of the pin_mask is 0xFFFFFFFF.
So I think this command can set multiple pins. Could you please try this.sm.setPins(1 | 2, 1 | 2 ) ?

[DoofyAss]

this.sm.setPins(1 | 2, 1 | 2 )

Not working 🥺

[DoofyAss]

strip.js

const { PIO, ASM, StateMachine } = require('rp2')



const clamp = (value, min, max) => Math.min(Math.max(value, min), max)



class Strip {



	constructor(option) {

		this.pin = option.pin
		this.num = option.num
		this.b = option.brightness * 0.01 || 1.0

		this.buffer = new Uint32Array(this.num)
		this.buffer.fill(0)



		this.asm = new ASM({ sideset: 1 })

		this.asm
		.label("bitloop").out("x", 1).side(0).delay(2)
		.jmp("!x", "do_zero").side(1).delay(1)
		.label("do_one").jmp("bitloop").side(1).delay(4)
		.label("do_zero").nop().side(0).delay(4)


		this.sm = new StateMachine(
		StateMachine.getAvailableId(),
		this.asm, {

			freq: 8000000,
			pullThreshold: 24,
			autopull: true,
			sidesetBase: this.pin,
			fifoJoin: PIO.FIFO_JOIN_TX,
			outShiftDir: PIO.SHIFT_LEFT,
		})

		this.sm.active(true)
		this.sm.put(this.buffer)
	}



	color(dec) {

		let hex = this.buffer[i]
		return [ hex >> 24 & 255, hex >> 16 & 255, hex >> 8 & 255 ]
	}



	decimal(r, g, b, a) {

		let A = a == undefined ? this.b : a * 0.01
		A = clamp(A, 0.0, 1.0)

		r = clamp(r, 0, 255)
		g = clamp(g, 0, 255)
		b = clamp(b, 0, 255)

		let G = parseInt(g * A) << 24
		let R = parseInt(r * A) << 16
		let B = parseInt(b * A) << 8

		return G | R | B
	}



	clear() { this.buffer.fill(0) }

	show() { this.sm.put(this.buffer) }

	brightness(p) { this.b = p * 0.01 }



	rgb(i, r, g, b, a) { this.buffer[i] = this.decimal(r, g, b, a) }

}



module.exports = { Strip }

index.js

const { Strip } = require('./module/strip')

const strip = new Strip({ pin: 0, num: 5, brightness: 5 })

strip.pin = 1
strip.sm.setPins(1, 1)


for (let i=0; i<strip.num; i++)
strip.rgb(i, 255, 255, 255)

strip.show()

[DoofyAss]

I had to use a multiplexer, but I would like to know if it is possible to change the pin after create a StateMachine

[communix]

@DoofyAss Sorry I don't fully understand PIO operation. I think it's better for you to ask it Raspberry Pi Forum.