📄 lcd.c
字号:
#include "lcd.h" /* Include LCD driver definitions */
#ifdef lcd4bit
#define OUTNUMBER(character) (character<<lcdDataPins) /* Shift the data */
/* bits until match the 4 consecutive output */
/* pins */
#define PORTMASK (~(0x0F<<lcdDataPins)) /* To locate the 4 */
/* consecutive output pins of the port, which */
/* will transmit the data */
#endif
#define cActive 1
#define cInactive 0
/* Variables used with the main program */
UINT8 timerLCD; /* Variable for delay times */
/* Local variables */
UINT8 LCDInternalStatus = 0; /* Variable for internal status */
UINT8 howmany; /* Temporal variable that have the number of */
/* characters pending to print */
UINT8 *nextchr; /* Pointer to next character to print */
/* Local functions */
void LCDPrintNext(void); /* Function that print the next character and */
/* increment the pointer "nextchr" and */
/* decrement the counter "howmany" */
/*+++++++++++++++++++++++++++++++ LCD Driver ++++++++++++++++++++++++++++++++*/
#ifdef lcdExists
/* Indicate to LCD "read data" through fallflank */
void LCDSend(void) {
lcdE = 1;
lcdE = 0;
}
/* Initialize LCD */
void LCDInit(void) {
static UINT8 Local_LCDStatusInit; /* Used for internal of function status*/
if (LCDInternalStatus == lcdStatusWaitingInit) {
/* Configure Pins to output and data sended */
lcdEDD = 1; /* LCD Enable pin as output */
lcdE = 0; /* LCD Enable pin is clear */
lcdRSDD = 1; /* Data/Instruction pin as output */
lcdRS = 0; /* Data/Instruction is clear */
#ifdef lcd4bit
lcdPortDD |= (0x0F << lcdDataPins); /* LCD port pins as output */
lcdPort &= PORTMASK; /* Taking the 4 pins of the port */
lcdPort |= OUTNUMBER(0x00); /* Nibble sended */
#else
lcdPortDD = 0xFF;
lcdPort = 0x00;
#endif
LCDInternalStatus = lcdStatusInit; /* Internal control identify the */
/* status of initialization for */
/* base time */
Local_LCDStatusInit = 1; /* Internal of function status in step */
/* one */
timerLCD = (UINT8) (gTimeBaseInterruptperms * 45); /* Sets the delay */
/* for of 45ms */
}
else switch (Local_LCDStatusInit) {
case 1: /* Function set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x03);
#else
lcdPort = 0x03;
#endif
LCDSend();
timerLCD = gTimeBaseInterruptperms * 5;
Local_LCDStatusInit = 2;
break;
case 2: /* Function set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x03);
#else
lcdPort = 0x03;
#endif
LCDSend();
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 3;
break;
case 3: /* Function set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x03);
#else
lcdPort = 0x03;
#endif
LCDSend();
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 4;
break;
case 4: /* Function set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x02); /* 4 bit mode */
#else
lcdPort = 0x3C; /* 8 bit mode */
#endif
LCDSend();
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 5;
break;
case 5: /* Function set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x02);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x08); /* 2 line; 5x10 dots */
LCDSend();
#else
lcdPort = 0x38;
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 6;
break;
case 6: /* Display ON/OFF Control */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x00);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x0C); /* Disply on; cursor off; blink off */
LCDSend();
#else
lcdPort = 0x0C;
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 7;
break;
case 7: /* Entry mode set */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x00);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x06); /* Increment mode; Entire shift on */
LCDSend();
#else
lcdPort = 0x06; /* Increment mode; Entire shift on */
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 8;
break;
case 8: /* Clear display */
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x00);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x01);
LCDSend();
#else
lcdPort = 0x01;
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms;
Local_LCDStatusInit = 9;
break;
case 9:
LCDInternalStatus = lcdStatusReady;
Local_LCDStatusInit = 0;
break;
}
}
/* Clear display */
void LCDClear(void) {
lcdRS = 0;
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x00);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(0x01);
LCDSend();
#else
lcdPort = 0x01;
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms * 2;
LCDInternalStatus = lcdStatusWaiting;
}
/* Set the cursor on the second line */
void LCD2L(void) {
LCDCursor(0x40);
}
/* Print the next character and increment the pointer "nextchr" and */
/* decrement the counter "howmany" */
void LCDPrintNext(void) {
if (howmany-- > 0) {
lcdRS = 1;
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(((*nextchr)>>0x04));
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(((*nextchr) & 0x0F));
LCDSend();
#else
lcdPort = (*nextchr);
LCDSend();
#endif
nextchr++;
timerLCD = gTimeBaseInterruptperms;
LCDInternalStatus = lcdStatusPrinting;
}
else {
LCDInternalStatus = lcdStatusReady;
}
}
/* Display a string with a specific length */
void LCDPrint(UINT8 *where, UINT8 length) {
if (LCDInternalStatus == lcdStatusReady) {
if (length > 0) {
howmany = length;
nextchr = where;
LCDPrintNext();
}
else { // ignore
}
}
else {
LCDInternalStatus = lcdStatusError;
}
}
/* This must be called each time that timerLCD is equal to 0 */
void LCDTimeBase(void) {
if (LCDInternalStatus == lcdStatusInit) {
LCDInit();
} else if (LCDInternalStatus == lcdStatusPrinting) {
LCDPrintNext();
} else if (LCDInternalStatus == lcdStatusWaiting) {
LCDInternalStatus = lcdStatusReady;
}
}
/* Return the status of LCD Drive */
UINT8 LCDStatus(void) {
return LCDInternalStatus;
}
/* Sets the cursor in the display ddramAddress */
void LCDCursor(UINT8 ddramAddress) {
if (LCDInternalStatus == lcdStatusReady) {
lcdRS = 0;
ddramAddress |= 0x80;
#ifdef lcd4bit
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(ddramAddress>>4);
LCDSend();
lcdPort &= PORTMASK;
lcdPort |= OUTNUMBER(ddramAddress & 0x0F);
LCDSend();
#else
lcdPort = ddramAddress;
LCDSend();
#endif
timerLCD = gTimeBaseInterruptperms;
LCDInternalStatus = lcdStatusWaiting;
}
else {
LCDInternalStatus = lcdStatusError;
}
}
#endif
/*++++++++++++++++++++++++++++++ END LCD Driver +++++++++++++++++++++++++++++*/⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -