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deadprogram
f459992f3c
This adds hardware timing support for driving WS2812 LEDs on Cortex-M microcontrollers running at 160MHz (such as the STM32U585). - Updated `go:generate` directive to include 160MHz. - Generated the corresponding `ws2812_writeByte160` assembly routine. - Added a switch case in `WriteByte` to handle generic 160MHz processors. Signed-off-by: deadprogram <ron@hybridgroup.com>
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
//go:build cortexm
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package ws2812
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// This file implements the WS2812 protocol for various Cortex-M
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// microcontrollers. It is intended to work with various variants: M0, M0+, M3,
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// and M4. Because machine.CPUFrequency() is usually a constant, the value will
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// usually be constant-propagated and the switch below will be a direct
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// (inlinable function) - thus there is usually no code size penalty over build
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// tags per CPU speed.
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import (
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"machine"
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)
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// Send a single byte using the WS2812 protocol.
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func (d Device) WriteByte(c byte) error {
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switch machine.CPUFrequency() {
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case 16_000_000: // 16MHz
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d.writeByte16(c)
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return nil
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case 48_000_000: // 48MHz
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d.writeByte48(c)
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return nil
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case 64_000_000: // 64MHz
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d.writeByte64(c)
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return nil
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case 120_000_000: // 120MHz
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d.writeByte120(c)
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return nil
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case 125_000_000: // 125 MHz e.g. rp2040 originally
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d.writeByte125(c)
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return nil
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case 150_000_000: // 150MHz, e.g. rp2350
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d.writeByte150(c)
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return nil
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case 160_000_000: // 160MHz, e.g. stm32u585
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d.writeByte160(c)
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return nil
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case 168_000_000: // 168MHz, e.g. stm32f405
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d.writeByte168(c)
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return nil
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case 200_000_000: // 200MHz, e.g. rp2040 starting with TinyGo v0.37
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d.writeByte200(c)
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return nil
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default:
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return errUnknownClockSpeed
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}
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}
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