LCD_main.rar_7920_ST7920_ST7920 lcd.h_st7920 并

#include <AT89X55.H> #include <LCD.h> #include <8255.h> #include <ABSACC.H> void ST7920_Init(void) { _8255_CS=0; PBYTE[_8255_Cortrol]= _8255_Init; _8255_CS=1; ST7920_WriteInstruction(ST7920_FUN_SET); ST7920_WriteInstruction(ST7920_CURSOR_Line); ST7920_WriteInstruction(ST7920_MODE_SET); } /* *********************************************************************************************** * Write Data RAM * * Description: Write Data RAM * * Arguments : Data value written to RAM * * Returns : none * * Notes : 1) *********************************************************************************************** */ void ST7920_WriteData(unsigned char temp) { unsigned char cDate; E12864=0; //E=0 cDate=temp; ST7920_RS=1; //RS=1 _8255_CS=0; PBYTE[_8255_Cortrol]=PC_2_RST; //RW=0 PBYTE[_8255_A]=cDate; //Write date to Lcd _8255_CS=1; E12864=1; //E=1 Delayl(0x1A); } /* *********************************************************************************************** * Write Instruction Register * * Description: Write Instruction Register * * Arguments : Instruction value written to Instruction Register * * Returns : none * * Notes : 1) *********************************************************************************************** */ void ST7920_WriteInstruction(unsigned char temp) { unsigned char cDate; E12864=0; //E=0 cDate=temp; ST7920_RS=0; //RS=0 _8255_CS=0; PBYTE[_8255_Cortrol]=PC_2_RST; //RW=0 PBYTE[_8255_A]=cDate; //Write date to Lcd _8255_CS=1; E12864=1; //E=1 Delayl(0x1A); } void DspTitle(void) { unsigned char Title[] = {"GSM/GPRS通信测试V1.01 2006年05月" "上海第二工业大学电子电气工程学院"}; WriteOneScreen(0x0,64,Title); } /* *********************************************************************************************** * Write Line Data * * Description: Write Data to Line (ST7920) * * Arguments : startAddress is the start address of the Line (80 ~ 9F) * dataNum is the number of data to be written to Line * dataVector is a pointer to the header of the data vector * Returns : none * * Notes : 1) MAY have problem while interrupts are being enabled * 2) data length is UP to 16 bytes * *********************************************************************************************** */ void ST7920_Write_Line (unsigned char startAddress, unsigned char dataNum, unsigned char *dataVector) { ST7920_WriteInstruction(startAddress); while(dataNum > 0) { ST7920_WriteData(*dataVector); dataNum--; dataVector++; } } /* *********************************************************************************************** * Write Full Screen * * Description: Write Full Screen (ST7920) * * Arguments : startAddress is the start address of the start (80 ~ 9F) * dataNum is the number of data to be written to Line (0~64) * dataVector is a pointer to the header of the data vector * * Returns : none * * Notes : 1) data length is UP to 16 bytes *********************************************************************************************** */ void WriteOneScreen(unsigned char startAddress, unsigned char dataNum,unsigned char *dataVector) { unsigned char cLoop; cLoop = startAddress; while(dataNum > 0) { switch(cLoop) { case 0x0: ST7920_WriteInstruction(0x80); break; case 0x10: ST7920_WriteInstruction(0x90); break; case 0x20: ST7920_WriteInstruction(0x88); break; case 0x30: ST7920_WriteInstruction(0x98); break; } cLoop=(cLoop+1)&0x3f; ST7920_WriteData(*dataVector); dataNum--; dataVector++; } } void Delayl(unsigned int time) { while (time > 0)time--; }