LP5864: minimum setup for Test

Hello,

I'm currently trying to light up a LED (L0-CS0) (150060AS75000 from wurth)  with the LP5864 to validate a circuit.
But i currently get no results.

I did try to find some example code for C, but could not find any. 

I'm trying to run it in mode 1, VIO_EN is connected to 3v3 and Vsync is connected to a microcontroller and VCC & VLED =3V3

currently I'm doing the flowing:

• reading Dev_config3 to validate the i2c connection.
• write and read 0x01 to Chip_en.
• write and read 0x20 to Dev_initial.
• write and read 0x4D to Dev_config3.
• write and read 0xFF to DC0 (dev.adr:0xA9 mem.adr:0x00)
• write and read 0x7F to pwm_bri0(dev.adr:0xAA mem.adr:0x00)

when measuring SW0 and CS0 I get the following result:

could you help my with this problem?