案例_第9章 基于NI Multisim 14的单片机仿真.zip

#include "pic.h" #define bitset(var,bitno) ((var) |= 1 << (bitno)) #define bitclr(var,bitno) ((var) &= ~(1 << (bitno)) // Commands to control LCD Graphical Display const int CMD_SET_CURSOR = 0x21; //SET CURSOR const int CMD_TXHOME = 0x40; //SET TXT HM ADD const int CMD_TXAREA = 0x41; //SET TXT AREA const int CMD_GRHOME = 0x42; //SET GR HM ADD const int CMD_GRAREA = 0x43; //SET GR AREA const int CMD_OFFSET = 0x22; //SET OFFSET ADD const int CMD_ADPSET = 0x24; //SET ADD PTR const int CMD_SETDATA_INC = 0x0C0; //WRITE DATA AND INCREASE ADP const int CMD_AWRON = 0x0B0; //SET AUTO WRITE MODE const int CMD_AWROFF = 0x0B2; //RESET AUTO WRITE MODE const int TEXT_NUM = 35; // Text data "Graphical LCD T6963C for Multisim" const char textTable[35] = { 0x27, 0x52, 0x41, 0x50, 0x48, 0x49, 0x43, 0x41, 0x4c, 0x00, \ 0x2C, 0x23, 0x24, 0x00, 0x34, 0x16, 0x19, 0x16, 0x13, 0x23, \ 0x00, 0x00, 0x00, 0x46, 0x4f, 0x52, 0x00, 0x2d, 0x55, 0x4c, \ 0x54, 0x49, 0x53, 0x49, 0x4d }; // Set Port B as output pins void SetPortBOutput(void) { PORTB = 0x00; bitset(STATUS, RP0); TRISB = 0X00; bitclr(STATUS, RP0); } void SendCommand(char cmd) { SetPortBOutput(); PORTB = cmd; PORTA = 0x0B; // Send write command ready to LCD (1011) bitset(PORTA, 2); } void SendDataByte(char databyte) { SetPortBOutput(); PORTB = databyte; PORTA = 0X0A; // Write data ready (1010) bitset(PORTA, 2); } void SendData(char highbyte, char lowbyte) { SendDataByte(lowbyte); SendDataByte(highbyte); } void init(void) { bitclr(STATUS, RP0); // Select Bank 0 PORTA = 0x00; PORTB = 0x00; bitset(STATUS, RP0); // Select Bank 1 OPTION_REG = 0x80; // Disable weak pull up resistors TRISA = 0x00; // Set Port A pins to output mode TRISA = 0x00; // Set Port B pins to output mode bitclr(STATUS, RP0); // Select Bank 0 PORTA = 0x0F; // No commands ready // Select display mode to graph + text, cursor off SendCommand( 0x9C ); // Set graphic mode home address to 0x0000 SendData(0,0); SendCommand(CMD_GRHOME); // Set text mode home address to 0x2941 SendData(0x29, 0x41); SendCommand(CMD_TXHOME); // Set character mode to use OR, use internal CG SendCommand(0x80); } // Write data in "textTable" array to be displayed // on Graphical LCD display to LCD's internal RAM. void DisplayLCDText(void) { int nIndex = 0; SendData(0x29, 0x7D); SendCommand(CMD_ADPSET); SendCommand(CMD_AWRON); for( nIndex = 0; nIndex<TEXT_NUM; nIndex++ ) { SendDataByte(textTable[nIndex]); } SendCommand(CMD_AWROFF); } // Move text right starting at the start address on the LCD // specified by startAddrHigh and startAddrLow a number // of steps specified by numSteps. void MoveTextRight(int startAddrHigh, int startAddrLow, int numSteps) { int nIndex = 0; for( nIndex = 0; nIndex<numSteps; nIndex++ ) { SendData(startAddrHigh, startAddrLow); SendCommand(CMD_TXHOME); startAddrLow--; } } // Move text left starting at the start address on the LCD // specified by startAddrHigh and startAddrLow a number // of steps specified by numSteps. void MoveTextLeft(int startAddrHigh, int startAddrLow, int numSteps) { int nIndex = 0; for( nIndex=0; nIndex<numSteps; nIndex++ ) { SendData(startAddrHigh, startAddrLow); SendCommand(CMD_TXHOME); startAddrLow++; } } void main() { init(); DisplayLCDText(); while( 1 ) { MoveTextRight(0x29, 0x41, 20); MoveTextLeft(0x29, 0x2D, 20); } }