tinygo-org/drivers
1
0
Fork 0
mirror of https://github.com/tinygo-org/drivers.git synced 2026-07-26 10:38:41 +00:00
Code Issues Packages Projects Releases 10 Wiki Activity

ws2812: add support for 160MHz cortex-m processors

Browse Source 
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));
}
__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"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\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"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t str %[maskClear], %[portClear] @ [2] T1H -> T1L transition\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\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))
void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
@@ -2192,6 +2563,16 @@ func (d Device) writeByte150(c byte) {
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) {
portSet, maskSet := d.Pin.PortMaskSet()
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.
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
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
d.writeByte150(c)
return nil
case 160_000_000: // 160MHz, e.g. stm32u585
d.writeByte160(c)
return nil
case 168_000_000: // 168MHz, e.g. stm32f405
d.writeByte168(c)
return nil