Lcd.c: Rozdiel medzi revíziami
Z SensorWiki
Riadok 1: | Riadok 1: | ||
<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) | ||
Riadok 69: | Riadok 68: | ||
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 |
} | } | ||
Riadok 88: | Riadok 87: | ||
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 |
} | } | ||
Riadok 135: | Riadok 134: | ||
/* ------------------------------------------------------- */ | /* ------------------------------------------------------- */ | ||
− | 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); | |
− | + | }*/ | |
− | } | ||
Riadok 163: | Riadok 166: | ||
_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;
}
*/