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1b7da60f8fd26f9efee0b44cd45fd72fa312fd28
drivers/ws2812/ws2812-asm_xtensa.go
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Ayke van Laethem 1b7da60f8f ws2812: convert Xtensa assembly to C inline assembly
2022-05-21 16:45:32 +02:00

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//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"
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"\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"
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"\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 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"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\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"
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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 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 s32i %[maskClear], %[portClear] // [1] T1H -> T1L transition\n"
"\t nop\n"
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"\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)
}
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