Lcd.c: Rozdiel medzi revíziami
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<source lang="c"> | <source lang="c"> | ||
#include "lcd.h" | |||
// ************************************************************************** | // ************************************************************************** | ||
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// Following two lines are a must when using BOOTLOADER: | // Following two lines are a must when using BOOTLOADER: | ||
UCSR0B = 0x00; // Disable RxD and TxD for UART0 | //UCSR0B = 0x00; // Disable RxD and TxD for UART0 | ||
// Disable ALL interrupts (Global) | // Disable ALL interrupts (Global) | ||
SREG = SREG & 0x7F; // same as cli(); without Interrupts.h | SREG = SREG & 0x7F; // same as cli(); without Interrupts.h | ||
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// initialize LCD control & data | // initialize LCD control & data | ||
// lines to output | // lines to output | ||
PORTC = 0b00000000; // pull-up on unused input | |||
DDRC = 0b11111111; // set ctrl & data as outputs | |||
PORTB = 0b00000000; // pull-up on unused input | |||
DDRB = 0b11111111; | |||
_delay_ms(50); // - wait 15ms or more | _delay_ms(50); // - wait 15ms or more | ||
// ------------------- | // ------------------- | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_RS); // set RS to "control" | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write" | ||
// 4 bit write | // 4 bit write | ||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
PORTC = (PORTC | 0x03) & 0xF3; // output data, high 4 bits | |||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
// ------------------- | // ------------------- | ||
_delay_ms(5); // - wait 4.1ms | _delay_ms(5); // - wait 4.1ms | ||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
// ------------------- | // ------------------- | ||
_delay_ms(1); // - wait 0.1ms | _delay_ms(1); // - wait 0.1ms | ||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
// ------------------- | // ------------------- | ||
_delay_ms(1); // - wait 0.1ms | _delay_ms(1); // - wait 0.1ms | ||
// ------------------- | // ------------------- | ||
PORTC = (PORTC | 0x02) & 0xF2; // output data, high 4 bits | |||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
// ------------------- | // ------------------- | ||
lcdControlWrite(0x28); // 0x28 - function set (2 rows, 5x8 font) | lcdControlWrite(0x28); // 0x28 - function set (2 rows, 5x8 font) | ||
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while(lcdBusy()) /* wait here */ ; // wait until LCD not busy or timeout | while(lcdBusy()) /* wait here */ ; // wait until LCD not busy or timeout | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_RS); // set RS to "control" | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write" | ||
PORTC = (PORTC&0xF0)|(c_data>>4); // output data, high 4 bits | |||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
PORTC = (PORTC&0xF0) | (c_data&0x0F); // output data, low 4 bits | |||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
} | } | ||
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while(lcdBusy()) /* wait */ ; // wait until LCD not busy or timeout | while(lcdBusy()) /* wait */ ; // wait until LCD not busy or timeout | ||
SETBIT( | SETBIT(PORTB, LCD_CTRL_RS); // set RS to "data" | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write" | ||
PORTC = (PORTC&0xF0)|(w_data>>4); // output data, high 4 bits | |||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
PORTC = (PORTC&0xF0) | (w_data&0x0F); // output data, low 4 bits | |||
SETBIT( | SETBIT(PORTB, LCD_CTRL_E); // set "E" line | ||
LCD_DELAY; // wait | LCD_DELAY; // wait | ||
CLEARBIT( | CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line | ||
} | } | ||
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/* ------------------------------------------------------- */ | /* ------------------------------------------------------- */ | ||
unsigned char ReadButtons() | /*unsigned char ReadButtons() | ||
{ | { | ||
DDRD = 0b00001110; | DDRD = 0b00001110; // make LCD bus inputs | ||
unsigned char state = 0xFF; // assume nothing pressed | |||
for(int scan = 1; scan<=10; scan++) | |||
{ | |||
state = state & ((PIND&0xF0)>>4); // make sure button held | |||
_delay_ms(5); // debounce 10 x 5 ms | |||
} | |||
DDRD = 0b11111110; // return bus to outputs | DDRD = 0b11111110; // return bus to outputs | ||
return(state); | |||
}*/ | |||
} | |||
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_delay_ms(1); | _delay_ms(1); | ||
return 0; | return 0; | ||
/* | |||
unsigned char pom; | |||
t_out_LCD=4; // pockam cca 4ms | |||
// wait until LCD busy bit goes to zero | |||
// do a read from control register | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control" | |||
LCD_DATA_PORT |= 0xF0; // set pull-ups to on (4bit) | |||
LCD_DATA_DDR &= 0x0F; // set data I/O lines to input (4bit) | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
pom= LCD_DATA_PIN&0xF0; // input data, high 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
LCD_DELAY; // wait | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
pom|=(LCD_DATA_PIN>>4)&0x0F; // input data, low 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
while ((pom & (1<<LCD_BUSY)) && t_out_LCD ) | |||
{ | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
pom=LCD_DATA_PIN&0xF0; // input data, high 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
LCD_DELAY; // wait | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
pom|=(LCD_DATA_PIN>>4)&0x0F; // input data, low 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
} | |||
// leave data lines in input mode so they can be most easily used for other purposes | |||
if(t_out_LCD) | |||
return 1; // ak vrati 1 timeout OK | |||
else | |||
return 0; // ak vrati 0 timeout notOK | |||
*/ | |||
} | } | ||
/* | |||
unsigned char lcdControlRead(void) | |||
{ | |||
// read the control byte from the display controller | |||
register unsigned char r_data=0; | |||
if(lcdBusyWait()) // wait until LCD not busy or time out | |||
{ | |||
outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0); // set pull-ups to on (4bit) | |||
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control" | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
r_data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
LCD_DELAY; // wait | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
r_data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
// leave data lines in input mode so they can be most easily used for other purposes | |||
} | |||
return r_data; | |||
} | |||
unsigned char lcdDataRead(void) | |||
{ | |||
// read a data byte from the display | |||
register unsigned char r_data =0; | |||
if(lcdBusyWait()) // wait until LCD not busy or time out | |||
{ | |||
outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0); // set pull-ups to on (4bit) | |||
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit) | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "data" | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read" | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
r_data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
LCD_DELAY; // wait | |||
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line | |||
LCD_DELAY; // wait | |||
r_data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits | |||
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line | |||
} | |||
// leave data lines in input mode so they can be most easily used for other purposes | |||
return r_data; | |||
} | |||
*/ | |||
</source> | |||
Aktuálna revízia z 14:43, 24. január 2013
#include "lcd.h"
// **************************************************************************
// *************************** PUBLIC FUNCTIONS *****************************
// **************************************************************************
void lcdInit4(void)
{
// Following two lines are a must when using BOOTLOADER:
//UCSR0B = 0x00; // Disable RxD and TxD for UART0
// Disable ALL interrupts (Global)
SREG = SREG & 0x7F; // same as cli(); without Interrupts.h
// initialize LCD control & data
// lines to output
PORTC = 0b00000000; // pull-up on unused input
DDRC = 0b11111111; // set ctrl & data as outputs
PORTB = 0b00000000; // pull-up on unused input
DDRB = 0b11111111;
_delay_ms(50); // - wait 15ms or more
// -------------------
CLEARBIT(PORTB, LCD_CTRL_RS); // set RS to "control"
CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write"
// 4 bit write
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
PORTC = (PORTC | 0x03) & 0xF3; // output data, high 4 bits
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
// -------------------
_delay_ms(5); // - wait 4.1ms
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
// -------------------
_delay_ms(1); // - wait 0.1ms
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
// -------------------
_delay_ms(1); // - wait 0.1ms
// -------------------
PORTC = (PORTC | 0x02) & 0xF2; // output data, high 4 bits
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
// -------------------
lcdControlWrite(0x28); // 0x28 - function set (2 rows, 5x8 font)
_delay_ms(50);
lcdControlWrite(0x0C); // 0x0C - display ON, cursor OFF
lcdControlWrite(0x01); // 0x01 - clear display
lcdControlWrite(0x06); // 0x06 - shift right
}
// ************************************************************
// ********************** LOCAL FUNCTIONS *********************
// ************************************************************
void lcdControlWrite(unsigned char c_data) // write the CONTROL byte to the display controller
{
while(lcdBusy()) /* wait here */ ; // wait until LCD not busy or timeout
CLEARBIT(PORTB, LCD_CTRL_RS); // set RS to "control"
CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write"
PORTC = (PORTC&0xF0)|(c_data>>4); // output data, high 4 bits
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
PORTC = (PORTC&0xF0) | (c_data&0x0F); // output data, low 4 bits
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
}
void lcdDataWrite(unsigned char w_data) // write a DATA byte to the display
{
while(lcdBusy()) /* wait */ ; // wait until LCD not busy or timeout
SETBIT(PORTB, LCD_CTRL_RS); // set RS to "data"
CLEARBIT(PORTB, LCD_CTRL_RW); // set R/W to "write"
PORTC = (PORTC&0xF0)|(w_data>>4); // output data, high 4 bits
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
PORTC = (PORTC&0xF0) | (w_data&0x0F); // output data, low 4 bits
SETBIT(PORTB, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
CLEARBIT(PORTB, LCD_CTRL_E); // clear "E" line
}
/* ------------------------------------------------------- */
/* Outputs string to a LCD (at current position) */
/* */
/* ------------------------------------------------------- */
void lcdStringWrite(char* String)
{
register uint8_t i=0;
// check to make sure we have a good pointer
if (!String) return;
// print data
while (String[i])
{
lcdDataWrite(String[i]);
i++;
}
}
/* ------------------------------------------------------- */
/* Read and debounce the LCD AppMod buttons */
/* */
/* Returns 0 if nothing is pressed */
/* Returns 1 if button A is pressed */
/* Returns 2 if button B is pressed */
/* Returns 4 if button C is pressed */
/* Returns 8 if button D is pressed */
/* Returns combination if more is pressed (e.g. 6 for B+C)*/
/* */
/* ------------------------------------------------------- */
/*unsigned char ReadButtons()
{
DDRD = 0b00001110; // make LCD bus inputs
unsigned char state = 0xFF; // assume nothing pressed
for(int scan = 1; scan<=10; scan++)
{
state = state & ((PIND&0xF0)>>4); // make sure button held
_delay_ms(5); // debounce 10 x 5 ms
}
DDRD = 0b11111110; // return bus to outputs
return(state);
}*/
/* ------------------------------------------------------- */
/* Test whether LCD is BUSY or READY for next command */
/* */
/* At the moment it is replaced by the fixed time delay */
/* */
/* Return values: 1 - OK */
/* 0 - timeout */
/* ------------------------------------------------------- */
volatile unsigned char t_out_LCD; // timeout displeja (krok 1024 us)
// krok 1ms
unsigned char lcdBusy(void)
{
_delay_ms(1);
return 0;
/*
unsigned char pom;
t_out_LCD=4; // pockam cca 4ms
// wait until LCD busy bit goes to zero
// do a read from control register
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control"
LCD_DATA_PORT |= 0xF0; // set pull-ups to on (4bit)
LCD_DATA_DDR &= 0x0F; // set data I/O lines to input (4bit)
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read"
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
pom= LCD_DATA_PIN&0xF0; // input data, high 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
pom|=(LCD_DATA_PIN>>4)&0x0F; // input data, low 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
while ((pom & (1<<LCD_BUSY)) && t_out_LCD )
{
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
pom=LCD_DATA_PIN&0xF0; // input data, high 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
pom|=(LCD_DATA_PIN>>4)&0x0F; // input data, low 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
}
// leave data lines in input mode so they can be most easily used for other purposes
if(t_out_LCD)
return 1; // ak vrati 1 timeout OK
else
return 0; // ak vrati 0 timeout notOK
*/
}
/*
unsigned char lcdControlRead(void)
{
// read the control byte from the display controller
register unsigned char r_data=0;
if(lcdBusyWait()) // wait until LCD not busy or time out
{
outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0); // set pull-ups to on (4bit)
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit)
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "control"
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read"
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
r_data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
r_data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
// leave data lines in input mode so they can be most easily used for other purposes
}
return r_data;
}
unsigned char lcdDataRead(void)
{
// read a data byte from the display
register unsigned char r_data =0;
if(lcdBusyWait()) // wait until LCD not busy or time out
{
outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0); // set pull-ups to on (4bit)
outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F); // set data I/O lines to input (4bit)
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RS); // set RS to "data"
SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW); // set R/W to "read"
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
r_data = inb(LCD_DATA_PIN)&0xF0; // input data, high 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
LCD_DELAY; // wait
SETBIT(LCD_CTRL_PORT, LCD_CTRL_E); // set "E" line
LCD_DELAY; // wait
r_data |= inb(LCD_DATA_PIN)>>4; // input data, low 4 bits
CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E); // clear "E" line
}
// leave data lines in input mode so they can be most easily used for other purposes
return r_data;
}
*/