# the value returned from EXTRA M?
button_flag_byte = 127

# bit masks
mask_at   = 0x03 # 00000011
mask_home = 0x0C # 00001100
mask_js   = 0x30 # 00110000
mask_zero = 0xC0 # 11000000

# get the button states from button_flag_byte 
btn_at   = button_flag_byte & mask_at
btn_home = (button_flag_byte & mask_home) >> 2
btn_js   = (button_flag_byte & mask_js) >> 4
btn_zero = (button_flag_byte & mask_zero) >> 6

# show the results in decimal and binary
print(f"{button_flag_byte = } (binary {button_flag_byte :08b})")
print(f"{btn_at = } (binary {btn_at:02b})")
print(f"{btn_home = } (binary {btn_home:02b})")
print(f"{btn_js = } (binary {btn_js:02b})")
print(f"{btn_zero = } (binary {btn_zero:02b})")

# console output:
# button_flag_byte = 127 (binary 01111111)
# btn_at = 3 (binary 11)
# btn_home = 3 (binary 11)
# btn_js = 3 (binary 11)
# btn_zero = 1 (binary 01)