| 0,0 → 1,305 |
|---|
| /**************************************************************************** |
| * 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); |
| } |