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https://github.com/tinygo-org/drivers.git
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Ayke van Laethem
b3af3f594e
Previously, a new implementation had to be written for each processor
speed. This is tedious and error-prone, therefore I've rewritten all of
the assembly code using a tool that will calculate exactly how many NOP
instructions are required.
I've also switched from build tags to a switch statement over all
processor speeds.
All in all, this means that:
- Chips with a supported CPU performance will automatically be
supported (no build tags necessary).
- Adding a new chip is as easy as adding the MHz count to the
generator script and to the switch statement.
Right now this is only for the Cortex-M, but it's certainly feasible to
extend this to other architectures such as the AVR.
43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
// Package ws2812 implements a driver for WS2812 and SK6812 RGB LED strips.
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package ws2812 // import "tinygo.org/x/drivers/ws2812"
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//go:generate go run gen-ws2812-arm.go
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import (
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"errors"
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"image/color"
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"machine"
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)
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var errUnknownClockSpeed = errors.New("ws2812: unknown CPU clock speed")
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// Device wraps a pin object for an easy driver interface.
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type Device struct {
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Pin machine.Pin
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}
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// New returns a new WS2812 driver. It does not touch the pin object: you have
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// to configure it as an output pin before calling New.
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func New(pin machine.Pin) Device {
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return Device{pin}
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}
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// Write the raw bitstring out using the WS2812 protocol.
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func (d Device) Write(buf []byte) (n int, err error) {
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for _, c := range buf {
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d.WriteByte(c)
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}
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return len(buf), nil
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}
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// Write the given color slice out using the WS2812 protocol.
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// Colors are sent out in the usual GRB format.
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func (d Device) WriteColors(buf []color.RGBA) error {
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for _, color := range buf {
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d.WriteByte(color.G) // green
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d.WriteByte(color.R) // red
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d.WriteByte(color.B) // blue
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}
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return nil
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}
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