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ws2812: add 200MHz support for the Cortex-M0/rp2040

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This commit is contained in:
Leon Matthews
2025-05-12 09:35:12 +12:00
committed by Ron Evans
parent d41bc0b85f
commit dbc9022f6a
3 changed files with 474 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ws2812/ws2812-asm_cortexm.go
+469
View File
@@ -1320,6 +1320,465 @@ void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_
[maskClear]"r"(maskClear),
[portClear]"m"(*portClear));
}
__attribute__((always_inline))
void ws2812_writeByte200(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
// T0H: 70 - 72 cycles or 350.0ns - 360.0ns
// T1H: 210 - 212 cycles or 1050.0ns - 1060.0ns
// TLD: 230 - cycles or 1150.0ns -
uint32_t value = (uint32_t)c << 24;
char i = 8;
__asm__ __volatile__(
"1: @ send_bit\n"
"\t str %[maskSet], %[portSet] @ [2] T0H and T0L start here\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
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"\t lsls %[value], #1 @ [1]\n"
"\t bcs.n 2f @ [1/3] skip_store\n"
"\t str %[maskClear], %[portClear] @ [2] T0H -> T0L transition\n"
"\t2: @ skip_store\n"
"\t nop\n"
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"\t subs %[i], #1 @ [1]\n"
"\t beq.n 3f @ [1/3] end\n"
"\t b 1b @ [1/3] send_bit\n"
"\t3: @ end\n"
: [value]"+r"(value),
[i]"+r"(i)
: [maskSet]"r"(maskSet),
[portSet]"m"(*portSet),
[maskClear]"r"(maskClear),
[portClear]"m"(*portClear));
}
*/
import "C"
@@ -1382,3 +1841,13 @@ func (d Device) writeByte168(c byte) {
interrupt.Restore(mask)
}
func (d Device) writeByte200(c byte) {
portSet, maskSet := d.Pin.PortMaskSet()
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte200(C.char(c), (*C.uint32_t)(unsafe.Pointer(portSet)), (*C.uint32_t)(unsafe.Pointer(portClear)), C.uint32_t(maskSet), C.uint32_t(maskClear))
interrupt.Restore(mask)
}
ws2812/ws2812.go
+1 -1
View File
@@ -1,7 +1,7 @@
// Package ws2812 implements a driver for WS2812 and SK6812 RGB LED strips.
package ws2812 // import "tinygo.org/x/drivers/ws2812"
//go:generate go run gen-ws2812.go -arch=cortexm 16 48 64 120 125 168
//go:generate go run gen-ws2812.go -arch=cortexm 16 48 64 120 125 168 200
//go:generate go run gen-ws2812.go -arch=tinygoriscv 160 320
import (
ws2812/ws2812_cortexm.go
+4 -1
View File
@@ -28,12 +28,15 @@ func (d Device) WriteByte(c byte) error {
case 120_000_000: // 120MHz
d.writeByte120(c)
return nil
case 125_000_000: // 125 MHz e.g. rp2040
case 125_000_000: // 125 MHz e.g. rp2040 originally
d.writeByte125(c)
return nil
case 168_000_000: // 168MHz, e.g. stm32f405
d.writeByte168(c)
return nil
case 200_000_000: // 200MHz, e.g. rp2040 starting with TinyGo v0.37
d.writeByte200(c)
return nil
default:
return errUnknownClockSpeed
}