(root)/C-OSD/trunk/max7456_software_spi.c - Rev 344
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/****************************************************************************
* Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje *
* admiralcascade@gmail.com *
* Project-URL: http://www.mylifesucks.de/oss/c-osd/ *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
****************************************************************************/
#include "max7456_software_spi.h"
/* ##########################################################################
* MAX7456 SPI & Display stuff
* ##########################################################################*/
/**
* Send a byte through SPI
*/
void spi_send(uint8_t byte) {
for (int8_t i = 7; i >= 0; i--) {
if (((byte >> i) & 1)) {
MAX_SDIN_HIGH
} else {
MAX_SDIN_LOW
}
MAX_SCLK_HIGH
MAX_SCLK_LOW
}
}
/**
* Send <byte> to <address> of MAX7456
*/
void spi_send_byte(uint8_t address, uint8_t byte) {
// start sending
MAX_CS_LOW
spi_send(address);
spi_send(byte);
// end sending
MAX_CS_HIGH
}
/**
* write a <character> to <address> of MAX7456 display memory
*/
void write_char(uint16_t address, char character) {
spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH
spi_send_byte(0x06, (address & 0x00FF)); // DMAL
spi_send_byte(0x07, character); // DMDI
}
/**
* write a character <attribute> to <address> of MAX7456 display memory
*/
void write_char_att(uint16_t address, char attribute) {
// the only important part is that the DMAH[1] is set
// so we add 2 which binary is the 2nd lowest byte
spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH
spi_send_byte(0x06, (address & 0x00FF)); // DMAL
spi_send_byte(0x07, attribute); // DMDI
}
/**
* write a <character> at <x>/<y> to MAX7456 display memory
*/
void write_char_xy(uint8_t x, uint8_t y, char character) {
uint16_t address = y * 30 + x;
write_char(address, character);
}
/**
* write a character <attribute> at <x>/<y> to MAX7456 display memory
*/
void write_char_att_xy(uint8_t x, uint8_t y, char attribute) {
uint16_t address = y * 30 + x;
write_char_att(address, attribute);
}
/**
* clear display by writing blank characters all over it
*/
void clear(void) {
uint16_t memory_address = 0;
for (unsigned int a = 0; a < 480; a++) {
write_char(memory_address++, 0);
}
}
/**
* write an ascii <character> to <address> of MAX7456 display memory
*/
void write_ascii_char(uint16_t address, char c) {
if (c == 32) c = 0; // remap space
else if (c > 48 && c <= 57) c -= 48; // remap numbers
else if (c == '0') c = 10; // remap zero
else if (c >= 65 && c <= 90) c -= 54; // remap big letters
else if (c >= 97 && c <= 122) c -= 60; // remap small letters
else if (c == '(') c = 63; // remap
else if (c == ')') c = 64; // remap
else if (c == '.') c = 65; // remap
else if (c == '?') c = 66; // remap
else if (c == ';') c = 67; // remap
else if (c == ':') c = 68; // remap
else if (c == ',') c = 69; // remap
else if (c == '\'') c = 70; // remap
else if (c == '/') c = 71; // remap
else if (c == '"') c = 72; // remap
else if (c == '-') c = 73; // remap minus
else if (c == '<') c = 74; // remap
else if (c == '>') c = 75; // remap
else if (c == '@') c = 76; // remap
write_char(address, c);
}
/**
* write an ascii <string> at <x>/<y> to MAX7456 display memory
*/
void write_ascii_string(uint8_t x, uint8_t y, char *string) {
while (*string) {
write_ascii_char(((x++)+(y * 30)), *string);
string++;
}
}
/**
* Write only the last three digits of a <number> at <x>/<y> to MAX7456
* display memory. takes full 16bit numbers as well for stuff
* like compass only taking three characters (values <= 999)
*/
void write_3digit_number_u(uint8_t x, uint8_t y, uint16_t number) {
uint16_t num = 100;
uint8_t started = 0;
while (num > 0) {
uint8_t b = number / num;
if (b > 0 || started || num == 1) {
write_ascii_char((x++)+(y * 30), '0' + b);
started = 1;
} else {
write_ascii_char((x++)+(y * 30), 0);
}
number -= b * num;
num /= 10;
}
}
/**
* Write only the last two digits of a number at <x>/<y> to MAX7456
* display memory. takes full 16bit numbers as well for stuff
* like seconds only taking two characters (values <= 99)
* Since this is used for seconds only and it looks better, there
* is a trading 0 attached
*/
void write_2digit_number_u(uint8_t x, uint8_t y, uint16_t number) {
uint16_t num = 10;
uint8_t started = 0;
while (num > 0) {
uint8_t b = number / num;
if (b > 0 || started || num == 1) {
write_ascii_char((x++)+(y * 30), '0' + b);
started = 1;
} else {
write_ascii_char((x++)+(y * 30), '0');
}
number -= b * num;
num /= 10;
}
}
/**
* write a unsigned number as /10th at <x>/<y> to MAX7456 display memory
*/
void write_number_u_10th(uint8_t x, uint8_t y, uint16_t number) {
uint16_t num = 10000;
uint8_t started = 0;
while (num > 0) {
uint8_t b = number / num;
if (b > 0 || started || num == 1) {
if ((num / 10) == 0) write_char((x++)+(y * 30), 65);
write_ascii_char((x++)+(y * 30), '0' + b);
started = 1;
} else {
write_ascii_char((x++)+(y * 30), 0);
}
number -= b * num;
num /= 10;
}
}
/**
* write a unsigned number at <x>/<y> to MAX7456 display memory
*/
void write_number_u(uint8_t x, uint8_t y, uint16_t number) {
uint16_t num = 10000;
uint8_t started = 0;
while (num > 0) {
uint8_t b = number / num;
if (b > 0 || started || num == 1) {
write_ascii_char((x++)+(y * 30), '0' + b);
started = 1;
} else {
write_ascii_char((x++)+(y * 30), 0);
}
number -= b * num;
num /= 10;
}
}
/**
* write a signed number at <x>/<y> to MAX7456 display memory
*/
void write_number_s(uint8_t x, uint8_t y, int16_t w) {
if (((uint16_t) w) > 32767) {
w = w - 65536;
int16_t num = -10000;
uint8_t started = 0;
while (num < 0) {
uint8_t b = w / num;
if (b > 0 || started || num == 1) {
if (!started) write_char((x - 1)+(y * 30), 0x49);
write_ascii_char((x++)+(y * 30), '0' + b);
started = 1;
} else {
write_ascii_char((x++)+(y * 30), 0);
}
w -= b * num;
num /= 10;
}
} else {
write_char((x)+(y * 30), 0);
write_number_u(x, y, w);
}
}
/**
* write <seconds> as human readable time at <x>/<y> to MAX7456 display mem
*/
void write_time(uint8_t x, uint8_t y, uint16_t seconds) {
uint16_t min = seconds / 60;
seconds -= min * 60;
write_3digit_number_u(x, y, min);
write_char_xy(x + 3, y, 68);
write_2digit_number_u(x + 4, y, seconds);
}
/**
* for testing write all chars to screen
*/
void write_all_chars() {
uint16_t x = 3, y = 2, t = 0;
while (t < 256) {
write_char_xy(x++, y, t++);
if (x > 25) {
y++;
x = 3;
}
}
}
/**
* let the MAX7456 learn a new character at <number>
* with <data>.
*/
void learn_char(uint8_t number, unsigned char* data) {
// select character to write (CMAH)
spi_send_byte(0x09, number);
for (uint8_t i = 0; i < 54; i++) {
// select 4pixel byte of char (CMAL)
spi_send_byte(0x0A, i);
// write 4pixel byte of char (CMDI)
spi_send_byte(0x0B, data[i]);
}
// write to the NVM array from the shadow RAM (CMM)
spi_send_byte(0x08, 0b10100000);
// according to maxim writing to nvram takes about 12ms, lets wait longer
_delay_ms(120);
}