error: 'SREG' was not declared in this scope

[huster-songtao]

FQBN: esp32:esp32:XIAO_ESP32C3
Using board 'XIAO_ESP32C3' from platform in folder: C:\Users\tao\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.15
Using core 'esp32' from platform in folder: C:\Users\tao\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.15

D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812_io.cpp: In member function 'void SK6812::sendarray_mask(uint8_t*, uint16_t, uint8_t, uint8_t*, uint8_t*)':
D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812_io.cpp:71:13: error: 'SREG' was not declared in this scope
sreg_prev=SREG;
^~~~
In file included from D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812.h:6,
from D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812.cpp:1:
D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812.cpp: In member function 'void SK6812::set_output(uint8_t)':
C:\Users\tao\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.15\cores\esp32/Arduino.h:114:70: error: cannot convert 'volatile uint32_t*' {aka 'volatile long unsigned int*'} to 'const volatile uint8_t*' {aka 'const volatile unsigned char*'} in assignment
#define portOutputRegister(port) ((volatile uint32_t*)GPIO_OUT_REG)
^
D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812.cpp:18:10: note: in expansion of macro 'portOutputRegister'
_port = portOutputRegister(digitalPinToPort(pin));
^~~~~~~~~~~~~~~~~~
C:\Users\tao\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.15\cores\esp32/Arduino.h:116:73: error: cannot convert 'volatile uint32_t*' {aka 'volatile long unsigned int*'} to 'volatile uint8_t*' {aka 'volatile unsigned char*'} in assignment
#define portModeRegister(port) ((volatile uint32_t*)GPIO_ENABLE_REG)
^
D:\Arduino\github\FastLED-RGBW\CRGBW\SK6812.cpp:19:14: note: in expansion of macro 'portModeRegister'
_port_reg = portModeRegister(digitalPinToPort(pin));
^~~~~~~~~~~~~~~~

exit status 1

Compilation error: 'SREG' was not declared in this scope