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ws2812: convert Xtensa assembly to C inline assembly

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This commit is contained in:
Ayke van Laethem
2022-05-21 16:45:32 +02:00
parent e4951091f4
commit 1b7da60f8f
4 changed files with 635 additions and 340 deletions
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ws2812/ws2812-asm_xtensa.go
+602
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@@ -0,0 +1,602 @@
//go:build xtensa
// +build xtensa
package ws2812
// Warning: autogenerated file. Instead of modifying this file, change
// gen-ws2812.go and run "go generate".
import "runtime/interrupt"
/*
#include <stdint.h>
__attribute__((always_inline))
void ws2812_writeByte80(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
// T0H: 28 - 28 cycles or 350.0ns - 350.0ns
// T1H: 84 - 84 cycles or 1050.0ns - 1050.0ns
// TLD: 92 - cycles or 1150.0ns -
uint32_t value = (uint32_t)c;
char i = 8;
__asm__ __volatile__(
"1: // send_bit\n"
"\t s32i %[maskSet], %[portSet] // [1] T0H and T1H 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 slli %[value], %[value], 1 // [1] shift value to the left by 1\n"
"\t bbsi %[value], 8, 2f // [1] branch to skip_store if bit 8 is set\n"
"\t s32i %[maskClear], %[portClear] // [1] 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"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t s32i %[maskClear], %[portClear] // [1] 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"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t addi %[i], %[i], -1 // [1]\n"
"\t bnez %[i], 1b // [1] send_bit, T1H and T1L end here\n"
: [value]"+r"(value),
[i]"+r"(i)
: [maskSet]"r"(maskSet),
[portSet]"m"(*portSet),
[maskClear]"r"(maskClear),
[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 - 56 cycles or 350.0ns - 350.0ns
// T1H: 168 - 168 cycles or 1050.0ns - 1050.0ns
// TLD: 184 - cycles or 1150.0ns -
uint32_t value = (uint32_t)c;
char i = 8;
__asm__ __volatile__(
"1: // send_bit\n"
"\t s32i %[maskSet], %[portSet] // [1] T0H and T1H 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"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t slli %[value], %[value], 1 // [1] shift value to the left by 1\n"
"\t bbsi %[value], 8, 2f // [1] branch to skip_store if bit 8 is set\n"
"\t s32i %[maskClear], %[portClear] // [1] 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"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t s32i %[maskClear], %[portClear] // [1] T1H -> T1L transition\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t addi %[i], %[i], -1 // [1]\n"
"\t bnez %[i], 1b // [1] send_bit, T1H and T1L end here\n"
: [value]"+r"(value),
[i]"+r"(i)
: [maskSet]"r"(maskSet),
[portSet]"m"(*portSet),
[maskClear]"r"(maskClear),
[portClear]"m"(*portClear));
}
*/
import "C"
func (d Device) writeByte80(c byte) {
portSet, maskSet := d.Pin.PortMaskSet()
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte80(C.char(c), portSet, portClear, maskSet, maskClear)
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), portSet, portClear, maskSet, maskClear)
interrupt.Restore(mask)
}