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LP5018: use iic init LP5018success,but LP5018 output pin not pwm signal output

Part Number: LP5018


i use single lp5018,and set device address 0x28,i use iic to initial the lp5018,config regist as follow:

DEVICE_CONFIG0 reg = 0x40,
DEVICE_CONFIG1 reg = 0x3f,


and i set LED0 brightness = 0xff,

lLED0 OUT0_COLOR = 0xaa,

lLED0 OUT1_COLOR = 0xff,

lLED0 OUT2_COLOR = 0xcc,

i am sure i write all data success to lp5018,but i can ont capture pwn signal from out0color pin 、out1color pin and out2color pin

how can i solve this problem。

I capture iic signal as follow: