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drivers/ws2812/ws2812-asm_esp32c3.go
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deadprogram 1d695a231a ws2812: add support for the ESP32-C3 processor 
This adds support to the WS2812 for the ESP32-C3 processor
which is a RISC-V processor from Espressif.

Signed-off-by: deadprogram <ron@hybridgroup.com>
2026-06-04 19:49:50 +02:00

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//go:build esp32c3
package ws2812
// Warning: autogenerated file. Instead of modifying this file, change
// gen-ws2812.go and run "go generate".
import "runtime/interrupt"
import "unsafe"
/*
#include <stdint.h>
__attribute__((section(".iram1"), noinline))
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 << 23;
char i = 8;
__asm__ __volatile__(
"1: // send_bit\n"
"\t sw %[maskSet], %[portSet] // [1] T0H and T0L start here\n"
"\t nop\n"
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"\t slli %[value], %[value], 1 // [1] shift value left by 1\n"
"\t bltz %[value], 2f // [1/3] skip_store\n"
"\t sw %[maskClear], %[portClear] // [1] T0H -> T0L transition\n"
"\t2: // skip_store\n"
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"\t addi %[i], %[i], -1 // [1]\n"
"\t bnez %[i], 1b // [1/3] send_bit\n"
: [value]"+r"(value),
[i]"+r"(i)
: [maskSet]"r"(maskSet),
[portSet]"m"(*portSet),
[maskClear]"r"(maskClear),
[portClear]"m"(*portClear));
}
*/
import "C"
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)
}
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