Good morning Vietnam!! I'm new of mbed world my first MCU programming was been PIC16F84A. I've a problem with this software: //test di intefacciamento con LCD HD44780 senza libreria #include "mbed.h" BusOut LCD_Data(p21, p22, p23, p24, p25, p26, p27, p28); DigitalOut E(p20); DigitalOut RS(p17); DigitalOut RW(p19); DigitalOut A(p29); DigitalOut K(p30); DigitalOut OK(LED1); AnalogOut contrast(p18); int main () { char text1[4] = {'C','I','A','O'}; char text2[9] = {'V','I','T','T','O','R','I','O','!'}; char init[5] = {1, 60, 12, 6, 2}; //inizializzazione LCD contrast = 2.5; A = 1; K = 0; RW = 0;//scrittura RS = 0;//comando for(int k = 0; k <= 4; k++) { LCD_Data = init[k]; E = 1; wait(0.5); E = 0; } //scrittura LCD_Data = 5;//indirizzo prima riga E = 1; wait(0.5); E = 0; RS = 1;//dato for(int i = 0; i <= 3; i++) { LCD_Data = text1[i]; E = 1; wait(0.5); E = 0; } RS = 0; LCD_Data = 67; E = 1; wait(0.5); E = 0; RS = 1; for(int j = 0; j <= 8; j++) { LCD_Data = text2[j]; E = 1; wait(0.5); E = 0; } OK = 1; } I want interface a HD44780 is my software right? P.S.: i'm sorry for my bad english

Thank you very much i've solved my problems