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contiki/platform/avr-ravenlcd/lcd.c
adamdunkels 0a961b2ada Contiki port for the Atmel AVR Raven board
2008-10-14 09:40:30 +00:00

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/*
* Copyright (c) 2008 Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* \brief
* This file provides Raven LCD support.
*
* \author
* Mike Vidales mavida404@gmail.com
*
*/
#include "lcd.h"
/**
* \addtogroup lcd
* \{
*/
typedef enum {
LCD_DUTY_STATIC = 0,
LCD_DUTY_HALF = 1,
LCD_DUTY_THIRD = 2,
LCD_DUTY_QUART = 3
} lcd_duty_t;
typedef enum {
LCD_PM_0_12 = 0x0,
LCD_PM_0_14 = 0x1,
LCD_PM_0_16 = 0x2,
LCD_PM_0_18 = 0x3,
LCD_PM_0_20 = 0x4,
LCD_PM_0_22 = 0x5,
LCD_PM_0_23 = 0x6,
LCD_PM_0_24 = 0x7,
LCD_PM_0_26 = 0x8,
LCD_PM_0_28 = 0x9,
LCD_PM_0_30 = 0xA,
LCD_PM_0_32 = 0xB,
LCD_PM_0_34 = 0xC,
LCD_PM_0_36 = 0xD,
LCD_PM_0_38 = 0xE,
LCD_PM_0_39 = 0xF
} lcd_pm_t;
#if defined( DOXYGEN )
static const seg_map[];
static const LCD_character_table[];
static const seg_inf[];
static const lcd_symbol_chart[LCD_SYMBOL_COUNT];
#else /* !DOXYGEN */
/** \name Mapping of segments for different characters */
/** \{ */
static const unsigned char seg_map[] PROGMEM = {
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F , /* 0 */
NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C , /* 1 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B| NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E| NUM_LCD_SYMBOL_G, /* 2 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D| NUM_LCD_SYMBOL_G, /* 3 */
NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C| NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* 4 */
NUM_LCD_SYMBOL_A| NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D| NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* 5 */
NUM_LCD_SYMBOL_A| NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* 6 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C , /* 7 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* 8 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D| NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* 9 */
NUM_LCD_SYMBOL_A|NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C| NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* A */
NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* B */
NUM_LCD_SYMBOL_A| NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F , /* C */
NUM_LCD_SYMBOL_B|NUM_LCD_SYMBOL_C|NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E| NUM_LCD_SYMBOL_G, /* D */
NUM_LCD_SYMBOL_A| NUM_LCD_SYMBOL_D|NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* E */
NUM_LCD_SYMBOL_A| NUM_LCD_SYMBOL_E|NUM_LCD_SYMBOL_F|NUM_LCD_SYMBOL_G, /* F */
0, /* ' ' (space) */
NUM_LCD_SYMBOL_G /* - (minus) */
};
/** \} */
/* Look-up tables for 14-segment characters */
static const unsigned int LCD_character_table[] PROGMEM = /* Character definitions table. */
{
0x0000, /* '*' (?) */
0x2830, /* '+' */
0x0000, /* ',' (Not defined) */
0x0810, /* '-' */
0x0200, /* '.' */
0x0240, /* '/' */
0x93C5, /* '0' */
0x80C0, /* '1' */
0x1994, /* '2' */
0x9894, /* '3' */
0x8891, /* '4' */
0x9815, /* '5' */
0x9915, /* '6' */
0x8084, /* '7' */
0x9995, /* '8' */
0x9895, /* '9' */
0x0000, /* ':' (Not defined) */
0x0000, /* ';' (Not defined) */
0x0000, /* '<' (Not defined) */
0x0000, /* '=' (Not defined) */
0x0202, /* '>' */
0x0000, /* '?' (Not defined) */
0x8E53, /* '@' (redefined as '%') */
0x8995, /* 'A' (+ 'a') */
0xB8A4, /* 'B' (+ 'b') */
0x1105, /* 'C' (+ 'c') */
0xB0A4, /* 'D' (+ 'd') */
0x1915, /* 'E' (+ 'e') */
0x0915, /* 'F' (+ 'f') */
0x9905, /* 'G' (+ 'g') */
0x8991, /* 'H' (+ 'h') */
0x2020, /* 'I' (+ 'i') */
0x9180, /* 'J' (+ 'j') */
0x0551, /* 'K' (+ 'k') */
0x1101, /* 'L' (+ 'l') */
0x81C3, /* 'M' (+ 'm') */
0x8583, /* 'N' (+ 'n') */
0x9185, /* 'O' (+ 'o') */
0x0995, /* 'P' (+ 'p') */
0x9585, /* 'Q' (+ 'q') */
0x0D95, /* 'R' (+ 'r') */
0x1406, /* 'S' (+ 's') */
0x2024, /* 'T' (+ 't') */
0x9181, /* 'U' (+ 'u') */
0x0341, /* 'V' (+ 'v') */
0x8781, /* 'W' (+ 'w') */
0x0642, /* 'X' (+ 'x') */
0x2042, /* 'Y' (+ 'y') */
0x1244, /* 'Z' (+ 'z') */
0x0000, /* '[' (Not defined) */
0x0000, /* '\' (Not defined) */
0x0000, /* ']' (Not defined) */
0x0000, /* '^' (Not defined) */
0x0000, /* '_' (Not defined) */
0x0004, /* A */
0x0080, /* B */
0x8000, /* C */
0x1000, /* D */
0x0100, /* E */
0x0001, /* F */
0x0002, /* G */
0x0020, /* H */
0x0040, /* J */
0x0800, /* K */
0x0400, /* L */
0x2000, /* M */
0x0200, /* N */
0x0010, /* O */
0x0000,
0x0000,
0x0000
};
/** \brief Seven segment reference guide in flash. */
static const unsigned char seg_inf[] PROGMEM = {
2<<5|19, /* A */
1<<5|19, /* B */
1<<5|9, /* C */
2<<5|4, /* D */
2<<5|9, /* E */
2<<5|14, /* F */
1<<5|14 /* G */
};
/** \brief LCD symbol chart located in flash. */
static const lcd_symbol_t lcd_symbol_chart[LCD_SYMBOL_COUNT] PROGMEM= {
/* Raven */
LCD_SYMBOL_RAVEN ,
/* Audio */
LCD_SYMBOL_BELL ,
LCD_SYMBOL_TONE ,
LCD_SYMBOL_MIC ,
LCD_SYMBOL_SPEAKER ,
/* Status */
LCD_SYMBOL_KEY ,
LCD_SYMBOL_ATT ,
/* Time */
LCD_SYMBOL_SUN ,
LCD_SYMBOL_MOON ,
LCD_SYMBOL_AM ,
LCD_SYMBOL_PM ,
/* Radio comus */
LCD_SYMBOL_RX ,
LCD_SYMBOL_TX ,
LCD_SYMBOL_IP ,
LCD_SYMBOL_PAN ,
LCD_SYMBOL_ZLINK ,
LCD_SYMBOL_ZIGBEE ,
/* Antenna status */
LCD_SYMBOL_ANT_FOOT,
LCD_SYMBOL_ANT_SIG1,
LCD_SYMBOL_ANT_SIG2,
LCD_SYMBOL_ANT_SIG3,
LCD_SYMBOL_ANT_DIS ,
/* Battery status */
LCD_SYMBOL_BAT_CONT,
LCD_SYMBOL_BAT_CAP1,
LCD_SYMBOL_BAT_CAP2,
LCD_SYMBOL_BAT_CAP3,
/* Envelope status */
LCD_SYMBOL_ENV_OP ,
LCD_SYMBOL_ENV_CL ,
LCD_SYMBOL_ENV_MAIN,
/* Temperature */
LCD_SYMBOL_C ,
LCD_SYMBOL_F ,
/* Numeric */
LCD_SYMBOL_MINUS ,
LCD_SYMBOL_DOT ,
LCD_SYMBOL_COL
};
#endif /* !DOXYGEN */
/** LCD text buffer */
static unsigned char lcd_text[20];
/** Textd buffer read pointer for text field in LCD display. When ptr>0 characters in front will be cleared (space) */
static int lcd_text_rd_ptr = 0;
/** Text pointer for writing new chars to text buffer */
static int lcd_text_wr_ptr = 0;
static bool lcd_scroll_enable;
static int lcd_scroll_prescale;
static int lcd_scroll_prescale_value;
static int lcd_num_print(uint16_t numb, bool negative, lcd_padding_t padding);
static void lcd_nmb_print_dig(uint8_t val, int dig);
static int lcd_text_sl(void);
static int lcd_text_put(const char* s, int pos);
static int lcd_char_put(unsigned char c, int pos);
/*---------------------------------------------------------------------------*/
/**
* \brief This function will initialize the proper settings for the LCD driver.
*
* This ATmega3290p can directly support an LCD through register mapping.
*
* \return 0
*/
int
lcd_init(void)
{
/*
* Configuring LCD with Extern clock (TOSC, 32.768kHz)
* 32786 Hz 32786 Hz
* frame_rate = ------------------ = ------------- = 32 Hz
* 8 * .prescl * .div 8 * 16 * 8
*/
lcd_config_t lcd_config ;
lcd_config.blanking = LCD_BLANKING_OFF;
lcd_config.buffer = LCD_BUFFER_ON;
lcd_config.wave = LCD_WAVE_LOW_POWER;
lcd_config.clock = LCD_CLOCK_EXTERN;
lcd_config.bias = LCD_BIAS_HALF;
lcd_config.prescl = LCD_PRESCL_16;
lcd_config.div = LCD_DIV_8;
lcd_config.drive = LCD_DRIVE_450;
lcd_config.contrast = LCD_CONTRAST_3_30;
/* Enable module */
PRR &= ~(1 << PRLCD);
/* Configure and enable LCD controller */
LCDCRB = lcd_config.lcdcrb|(LCD_PM_0_39<<LCDPM0)|(LCD_DUTY_QUART<<LCDMUX0); /* Add port mask/mux */
LCDFRR = lcd_config.lcdfrr;
LCDCCR = lcd_config.lcdccr;
LCDCRA = lcd_config.lcdcra|(1<<LCDEN)|(1<<LCDIE); /* Add interrupt- and LCD- enable */
/* clear screen */
lcd_symbol_clr_all();
/* Calculate scrolling value */
lcd_scroll_prescale_value = LCD_CLCK_FRQ/128;
lcd_scroll_prescale_value >>= (lcd_config.prescl == 0) ? 4 : (5+lcd_config.prescl);
lcd_scroll_prescale_value /= (lcd_config.div+1);
lcd_scroll_prescale_value = (lcd_scroll_prescale_value==0) ? 1 : lcd_scroll_prescale_value;
lcd_scroll_prescale = lcd_scroll_prescale_value;
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will disable the LCD operation.
*/
void
lcd_deinit(void)
{
while (!(LCDCRA & (1<<LCDIF)))
;
/*
* Set LCD Blanking and clear interrupt flag
* by writing a logical one to the flag.
*/
LCDCRA = (1<<LCDEN)|(1<<LCDIF)|(1<<LCDBL);
/* Wait until LCD Blanking is effective. */
while ( !(LCDCRA & (1<<LCDIF)) )
;
/* Disable LCD */
LCDCRA = (0<<LCDEN) | (0<<LCDIE);
/* power LCD down */
PRR |= (1 << PRLCD);
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will convert the incoming decimal number to BCD.
*
* \param inNumber Decimal number to convert
*
* \return newByte The converted deicmal number as byte.
*/
uint8_t
itobcd(uint8_t inNumber)
{
int newByte;
newByte = 0;
while (inNumber >= 10){
inNumber -= 10;
newByte++;
}
newByte = newByte << 4;
newByte = (newByte | inNumber);
return newByte;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a HEX value on the LCD that represents the input
* parameter.
*
* \param numb Number to display as HEX.
* \param padding This pads the location to place the value on the LCD.
*
* \return lcd_num_print()
*/
int
lcd_num_puthex(uint16_t numb, lcd_padding_t padding)
{
return lcd_num_print(numb, false, padding);
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a DEC value on the LCD that represents the input
* parameter.
*
* \param numb Number to display as DEC.
* \param padding This pads the location to place the value on the LCD.
*
* \return lcd_num_print()
*/
int
lcd_num_putdec(int numb, lcd_padding_t padding)
{
uint16_t bcd;
/* Check for overflow */
if (numb > 9999) {
numb = 9999;
} else if (numb < -9999) {
numb = -9999;
}
/* Convert to BCD */
bcd = itobcd(abs(numb));
/* Print */
return lcd_num_print(bcd, (bool)(numb<0), padding);
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will clear numbers displayed on the LCD.
*
* \return 0
*/
int
lcd_num_clr(void)
{
volatile unsigned char* lcd_data = (volatile unsigned char*)0xEC;
int i,j;
for (i=0;i<4;++i){
for (j=0;j<7;++j){
lcd_data[pgm_read_byte(&seg_inf[j])&0x1F] &= ~((pgm_read_byte(&seg_inf[j])>>5)<<(i*2));
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a string of characters out to the LCD.
*
* \param s First character pointer of string.
*
* \return 0
*/
int
lcd_puts(const char* s)
{
strcpy((char*)lcd_text, s);
lcd_text_wr_ptr = strlen(s);
lcd_text_rd_ptr = 0;
lcd_text_put((char*)&lcd_text[lcd_text_rd_ptr], 1);
lcd_scroll_enable = (lcd_text_wr_ptr > 7) ? true : false;
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a string of characters of a certain length out to the LCD.
*
* \param length Length of string to print.
* \param s First character pointer of string.
*
* \return 0
*/
int
lcd_puta(size_t length, const uint8_t *s)
{
memcpy((void*)lcd_text, (void const*)s, length);
lcd_text_wr_ptr = length;
lcd_text_rd_ptr = 0;
lcd_text_put((char*)&lcd_text[lcd_text_rd_ptr], 1);
lcd_scroll_enable = (lcd_text_wr_ptr > 7) ? true : false;
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a string out to the LCD from Flash.
*
* \param s First character pointer of the string located in Flash
*
* \return 0
*/
int
lcd_puts_P(const char *s)
{
strcpy_P((char*)lcd_text, s);
lcd_text_wr_ptr = strlen_P(s);
lcd_text_rd_ptr = 0;
lcd_text_put((char*)&lcd_text[lcd_text_rd_ptr], 1);
lcd_scroll_enable = (lcd_text_wr_ptr > 7) ? true : false;
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a single character out to the LCD.
*
* \param c Character to display on LCD.
*
* \return 0
*/
int
lcd_putchar(unsigned char c)
{
lcd_text[lcd_text_wr_ptr++] = c;
lcd_text[lcd_text_wr_ptr] = 0;
lcd_text_put((char*)&lcd_text[lcd_text_rd_ptr], 1);
lcd_scroll_enable = (lcd_text_wr_ptr > 7) ? true : false;
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will enable any of the symbols on the Raven LCD.
*
* \param symbol Specific symbol to enable on the LCD.
*/
void
lcd_symbol_set(lcd_symbol_t symbol)
{
unsigned char mem_offset;
unsigned char bit_offset;
volatile unsigned char* lcd_data = (volatile unsigned char*)0xEC;
/* Symbol format = bbbnnnnn where b is bit and n is offset */
bit_offset = (symbol >> 5);
mem_offset = (symbol & 0x1F);
if ( mem_offset >= 20 ){
return; /* Data out of range of the LCD registers */
}
lcd_data = lcd_data + mem_offset; /* Point to the relevant LCDDR */
*lcd_data = *lcd_data | ( 1 << bit_offset);
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will clear any symbol on the Raven LCD.
*
* \param symbol Specific symbol to clear from the LCD.
*/
void
lcd_symbol_clr(lcd_symbol_t symbol)
{
unsigned char offset;
unsigned char setbit;
volatile unsigned char* lcd_data = (volatile unsigned char*)0xEC;
/* symbol format = bbbnnnnn where b is bit and n is offset */
setbit = (symbol >> 5);
offset = (symbol & 0x1F);
if ( offset >= 20 ){
return; /* data out of range of the LCD registers */
}
lcd_data = lcd_data + offset; /* Point to the relevant LCDDR */
*lcd_data = *lcd_data & ~( 1 << setbit);
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will enable a group of symbols from the lcd_symbol_chart.
*
* \param start Position of table to start from.
* \param count Number of symbols to enable from start position.
*/
void
lcd_symbol_set_group(int start, int count)
{
count = (start + count)>LCD_SYMBOL_COUNT ?
LCD_SYMBOL_COUNT - start :
count;
int i;
for(i=start; i<start+count; ++i){
lcd_symbol_set(pgm_read_byte(&lcd_symbol_chart[i]));
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will disable a group of symbols from the lcd_symbol_chart.
*
* \param start Position of table to start from.
* \param count Number of symbols to disable from start position.
*/
void
lcd_symbol_clr_group(int start, int count)
{
count = (start + count)>LCD_SYMBOL_COUNT ?
LCD_SYMBOL_COUNT - start :
count;
int i;
for(i=start; i<count; ++i){
lcd_symbol_clr(pgm_read_byte(&lcd_symbol_chart[i]));
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will print a number to the LCD with the following parameters.
*
* \param numb Number to display on LCD.
* \param negative Display negative sign in the next digit field.
* \param padding This pads the location to place the value on the LCD.
*
* \return 0
*/
static int
lcd_num_print(uint16_t numb, bool negative, lcd_padding_t padding)
{
int i;
for (i=0;i<4;/**/) {
/* Get segments for this digit and print it */
lcd_nmb_print_dig(pgm_read_byte(&seg_map[(numb&(0xF<<4*i))>>4*i]), i);
/* If rest of number is zero */
if (++i<4) {
if (numb >> 4*i == 0) {
if (negative == true) { /* print a 'minus' in the next digit field */
lcd_nmb_print_dig(pgm_read_byte(&seg_map[(padding == LCD_NUM_PADDING_ZERO) ? LCD_SEV_SEG_INDEX_0 : LCD_SEV_SEG_INDEX_MINUS]), i++);
if (padding == LCD_NUM_PADDING_ZERO) {
lcd_symbol_set(LCD_SYMBOL_MINUS);
}
} else {
lcd_symbol_clr(LCD_SYMBOL_MINUS);
}
while (i<4){
lcd_nmb_print_dig(pgm_read_byte(&seg_map[(padding == LCD_NUM_PADDING_ZERO) ? LCD_SEV_SEG_INDEX_0 : LCD_SEV_SEG_INDEX_SPACE]), i++);
}
}
} else {
if (negative == true) {
lcd_symbol_set(LCD_SYMBOL_MINUS);
} else {
lcd_symbol_clr(LCD_SYMBOL_MINUS);
}
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will print a number according to the segment map of the LCD.
*
* \param val Number that is to be matched to appropriate segments.
* \param dig Segment to enable
*/
static void
lcd_nmb_print_dig(uint8_t val, int dig)
{
volatile unsigned char* lcd_data = (volatile unsigned char*)0xEC;
int j;
for (j=0;j<7;++j){
if (val & (1<<j)) {
lcd_data[pgm_read_byte(&seg_inf[j])&0x1F] |= (pgm_read_byte(&seg_inf[j])>>5)<<(dig*2);
}
else {
lcd_data[pgm_read_byte(&seg_inf[j])&0x1F] &= ~((pgm_read_byte(&seg_inf[j])>>5)<<(dig*2));
}
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will scroll the test on the LCD.
*
* \return 0
*/
static int
lcd_text_sl(void)
{
static int pos = 1;
if (lcd_text[lcd_text_rd_ptr] == 0) {
lcd_text_rd_ptr = 0;
pos = 7;
}
else {
if (pos){
pos--;
}
else {
lcd_text_rd_ptr++;
}
}
lcd_text_put((char*)&lcd_text[lcd_text_rd_ptr], pos);
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put test out to the LCD at a certain location padded with
* spaces.
*
* \param s First character pointer to the string of test to print.
* \param pos Count of spaces entered before printing the text.
*
* \return 0
*/
static int
lcd_text_put(const char* s, int pos)
{
int i;
/* Pad with spaces in front if offset > 0 */
for (i=1; i<pos; i++) {
lcd_char_put(' ', i);
}
/* Print characters, overwrite with spaces at end if necessary */
for ( i=pos; i<=7; ++i) {
if (*s == 0) {
lcd_char_put(' ', i);
}
else {
lcd_char_put( (unsigned char)*s++, i);
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will put a single char out to the LCD by looking up the
* proper segments.
*
* \param c Character to display on the LCD.
* \param pos This will add spaces for positioning the text on the LCD.
*
* \return 0
*/
static int
lcd_char_put(unsigned char c, int pos)
{
unsigned int seg, segMask;
unsigned char i;
unsigned char mask, nibble, nibbleMask;
volatile unsigned char* lcd_data = (volatile unsigned char*)0xEC;
unsigned char lcd_reg;
if (pos > 7){
return EOF;
}
/* Lookup character table for segmet data */
if (((c >= '*') && (c <= 'z')) || (c == ' ')){
if (c >= 'a' ){
c &= ~0x20; /* c is in character_table. Convert to upper if necessarry. */
}
if (c == ' ') {
c = 0x00;
}
else {
c -= '*';
}
if ( c > 0x35 ){
return EOF; /* c points outside array */
}
else{
seg = pgm_read_dword(&LCD_character_table[c]);
}
}
else {
return EOF; /* ASCII code out of range */
}
/* Adjust mask according to digit */
segMask = 0x4008; /* masking out two bits */
i = pos-1; /*i used as pointer offset */
i >>= 1;
lcd_data += i; /* Point to the first relevant LCDDR; i = {0,0,1,1,2,2} */
i = 4; /*i used as loop counter */
do{
nibble = seg & 0x000F;
nibbleMask = segMask & 0x000F;
seg >>= 4;
segMask >>= 4;
if (pos & 0x01) {
mask = 0xF0 | nibbleMask;
}
else {
nibble <<= 4;
mask = 0x0F | ( nibbleMask <<4 );
}
lcd_reg = *lcd_data;
*lcd_data |= (lcd_reg & mask) | nibble; /* Write new bit values */
lcd_reg = *lcd_data;
*lcd_data &= (lcd_reg & mask) | nibble;
lcd_data += 5;
} while ( --i );
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This is the LCD Start of Frame Interrupt Subroutine.
*
* This interrupt fires at the beginning of a new frame.
*/
ISR
(LCD_vect)
{
if (lcd_scroll_enable) {
if (--lcd_scroll_prescale == 0) {
lcd_text_sl();
lcd_scroll_prescale = lcd_scroll_prescale_value;
}
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief Turns the Raven nose LED on.
*/
void
led_on(void)
{
DDRB |= 0x80;
PORTB &= ~0x80;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Turns the Raven nose LED off.
*/
void
led_off(void)
{
DDRB &= ~0x80;
PORTB |= 0x80;
}
/*---------------------------------------------------------------------------*/
/**
* \brief This will add the passed in number to any of the four locations of
* the four digit segment display on the LCD.
*
* \param numb Number to display.
* \param pos Position to display number.
*/
void
lcd_single_print_dig(uint8_t numb, uint8_t pos)
{
lcd_nmb_print_dig(pgm_read_byte(&seg_map[numb]), pos);
}
/** \} */
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