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NRF52832 connect with LCD 16x2

Hi all! I have some problems about NRF52832 interface with LCD 16x2 (

*** Proplem: I can put anything in character table of datasheet but i can't create any customer character by writing to CGRAM "LCDBuildChar()". Sometime it can't put something but it's not my intention. Someone can help me? PLS This is my code: main.c LCD.c LCD.h Delay.c Delay.h