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ws2812: add support for 160MHz cortex-m processors

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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>
This commit is contained in:
deadprogram
2026-05-06 18:41:29 +02:00
committed by Ron Evans
parent 62663c1832
commit f459992f3c
3 changed files with 385 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ws2812/ws2812-asm_cortexm.go
+381
View File
@@ -1281,6 +1281,377 @@ void ws2812_writeByte150(char c, uint32_t *portSet, uint32_t *portClear, uint32_
[portClear]"m"(*portClear)); [portClear]"m"(*portClear));
} }
__attribute__((always_inline))
void ws2812_writeByte160(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
// T0H: 56 - 58 cycles or 350.0ns - 362.5ns
// T1H: 168 - 170 cycles or 1050.0ns - 1062.5ns
// TLD: 184 - 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"
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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 str %[maskClear], %[portClear] @ [2] T1H -> T1L transition\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));
}
__attribute__((always_inline)) __attribute__((always_inline))
void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) { void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings: // Timings:
@@ -2192,6 +2563,16 @@ func (d Device) writeByte150(c byte) {
interrupt.Restore(mask) interrupt.Restore(mask)
} }
func (d Device) writeByte160(c byte) {
portSet, maskSet := d.Pin.PortMaskSet()
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte160(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)
}
func (d Device) writeByte168(c byte) { func (d Device) writeByte168(c byte) {
portSet, maskSet := d.Pin.PortMaskSet() portSet, maskSet := d.Pin.PortMaskSet()
portClear, maskClear := d.Pin.PortMaskClear() portClear, maskClear := d.Pin.PortMaskClear()
ws2812/ws2812.go
+1 -1
View File
@@ -4,7 +4,7 @@
// On RP2040/RP2350 it uses PIO for hardware-timed control. // On RP2040/RP2350 it uses PIO for hardware-timed control.
package ws2812 // import "tinygo.org/x/drivers/ws2812" package ws2812 // import "tinygo.org/x/drivers/ws2812"
//go:generate go run gen-ws2812.go -arch=cortexm 16 48 64 120 125 150 168 200 //go:generate go run gen-ws2812.go -arch=cortexm 16 48 64 120 125 150 160 168 200
//go:generate go run gen-ws2812.go -arch=tinygoriscv 160 320 //go:generate go run gen-ws2812.go -arch=tinygoriscv 160 320
import ( import (
ws2812/ws2812_cortexm.go
+3
View File
@@ -34,6 +34,9 @@ func (d Device) WriteByte(c byte) error {
case 150_000_000: // 150MHz, e.g. rp2350 case 150_000_000: // 150MHz, e.g. rp2350
d.writeByte150(c) d.writeByte150(c)
return nil return nil
case 160_000_000: // 160MHz, e.g. stm32u585
d.writeByte160(c)
return nil
case 168_000_000: // 168MHz, e.g. stm32f405 case 168_000_000: // 168MHz, e.g. stm32f405
d.writeByte168(c) d.writeByte168(c)
return nil return nil