/************************************* | "LCDtest6.c" | LCD command/data transmittal | program for ATMEL (Temic)T80C51 | microcontroller ====================================== | Tests initialization of a 2x16 | LCD 44780-based display module, 8 bit | dat/cont. sent, 2 control bits: | RS = control/data = 0/1 = P3.2 | E = enable = P3.4 | R/W* = P3.3 | P1 = output | (P3 = output) | IE = interrupts disabled |-------------------------------------- | 8/4/04 Marty McLeod | IDE: Keil uVision2 Eval V7 ---------------------------------------*/ #include unsigned int i; unsigned int j; //Function prototypes here void DELAY(void); void NOP(void); //Begin main of program void main(void) { //Initialize 8051 SFRs: IE = 0; //Disable interrupts P1 = 0x00; //Set port 1 to OUTPUT P3 = 0x00; //Set port 3, all bits, to OUTPUT // PSW = 0x00; //Clear program status word PS while(1) { /********************************************/ //Attempt to do partial initialization: DELAY(); DELAY(); //Command: for 8 bit, 2 lines P3_2 = 0; //RS = control P3_4 = 1; //E = true then post command, then wait... P1 = 0x38; //8 bit, 2 lines DELAY(); //wait P3_4 = 0; //Toggle E low // DELAY(); DELAY(); //Command: clear P3_2 = 0; //RS = control P3_4 = 1; //E = true then post command, then wait... P1 = 0x01; //Display on, cursor off DELAY(); //wait P3_4 = 0; //Toggle E low // DELAY(); DELAY(); //Command: on P3_2 = 0; //RS = control P3_4 = 1; //E = true then post command, then wait... P1 = 0x0C; //Display on, cursor off DELAY(); //wait P3_4 = 0; //Toggle E low }//while(1) end }//main(void) /****************************/ /* Functions defined below */ void DELAY(void) { for(i = 0; i < 3000; ++i) { NOP(); } } void NOP(void) { j = 0; } /**** END OF FILE ****/