WebSVN - Projects - Diff - Rev 514 and 519 - /C-OSD/trunk/max7456_software

 /****************************************************************************
  *   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 <avr/io.h>
 #include <util/delay.h>
 #include <avr/pgmspace.h>
+#include <string.h>
+#include <stdlib.h>
 #include "main.h"
 #include "max7456_software_spi.h"
 /* ##########################################################################
  * MAX7456 SPI & Display stuff
  * ##########################################################################*/
 /**
  * Send a byte through SPI
+ * inline because it increases the codesize currenlty 'only' by 110byte but saves
+ * the context-change on every char and attribute which is at least done twice
+ * (address and data byte), a significant speed-bost we do not want to miss :)
  */
-void spi_send(uint8_t byte) {
+inline 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
+}
 /**
  *  clear display memory
  *  (also sets 8bit mode)
  */
 void clear(void) {
     /*uint16_t memory_address = 0;
     for (unsigned int a = 0; a < 480; a++) {
         write_char(memory_address++, 0);
     }*/
         // clear all display-mem (DMM)
     spi_send_byte(0x04, 0b01000100);
     // clearing takes 12uS according to maxim so lets wait longer
     _delay_us(20);
+}
 /**
  * for testing write all chars to screen
  */
 void write_all_chars() {
     uint16_t x = 3, y = 2, t = 0;
     while (t < 256) {
         write_char(x++ + y*30, t++);
         if (x > 25) {
             y++;
             x = 3;
+        }
+    }
+}
 #if !(ALLCHARSDEBUG|(WRITECHARS != -1))
 /**
  *  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);
+}
 /**
  * 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);
+}
 /**
  *  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 an ascii <string> from progmen at <x>/<y> to MAX7456 display memory
  */
 void write_ascii_string_pgm(uint8_t x, uint8_t y, const char *string) {
         while (pgm_read_byte(string) != 0x00)
                 write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++));
+}
 /**
  *  write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory
  */
 void write_string_pgm_down(uint8_t x, uint8_t y, const char *string, uint8_t length) {
         while (length--)
                 write_char((x+(y++ * 30)), pgm_read_byte(string++));
+}
 /**
- * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
+ * Write a unsigned <number> at <x>/<y> to MAX7456 display memory
- * <num> represents the largest multiple of 10 that will still be displayable as
+ * <length> represents the length to rightbound the number
- * the first digit, so num = 10 will be 0-99 and so on
  * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
  */
-void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
+void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t length, uint8_t pad) {
-                // if number is largar than 99[..]9 we must decrease it
-                while (number >= (num * 10)) {
-                        number -= num * 10;
-                }
-                uint8_t started = 0;
-                while (num > 0) {
+        char s[7];
-                        uint8_t b = number / num;
+        itoa(number, s, 10 );
-                        if (b > 0 || started || num == 1) {
+        for (uint8_t i = 0; i < length - strlen(s); i++) {
-                            write_ascii_char((x++)+(y * 30), '0' + b);
-                            started = 1;
-                        } else {
-                                if (pad) write_ascii_char((x++)+(y * 30), '0');
+                if (pad) write_char((x++)+(y * 30), 10);
-                                else write_ascii_char((x++)+(y * 30), 0);
+                else write_ascii_char((x++)+(y * 30), 0);
-                        }
+        }
-                        number -= b * num;
+        write_ascii_string(x,  y, s);
-                        num /= 10;
-                }
+}
 /**
- * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
+ * Write a signed <number> at <x>/<y> to MAX7456 display memory
- * <num> represents the largest multiple of 10 that will still be displayable as
+ * <length> represents the length to rightbound the number
- * the first digit, so num = 10 will be 0-99 and so on
  * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
  */
-void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
+void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t length, uint8_t pad) {
-    if (((uint16_t) number) > 32767) {
-        number = number - 65536;
-                num *= -1;
+        char s[7];
-                // if number is smaller than -99[..]9 we must increase it
-                while (number <= (num * 10)) {
+        itoa(number, s, 10 );
-                        number -= num * 10;
-                }
-                uint8_t started = 0;
-                while (num < 0) {
-                        uint8_t b = number / num;
+        for (uint8_t i = 0; i < length - strlen(s); i++) {
-                        if (pad) write_ascii_char((x)+(y * 30), '0');
+                if (pad) write_char((x++)+(y * 30), 10);
-                        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);
+                else write_ascii_char((x++)+(y * 30), 0);
-                        }
-                        number -= b * num;
-                        num /= 10;
-                }
+        }
-        } else {
-        write_char((x)+(y * 30), 0);
+        write_ascii_string(x,  y, s);
-        write_ndigit_number_u(x, y, number, num, pad);
-    }
+}
 /**
- * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
+ * Write a unsigned <number> at <x>/<y> to MAX7456 display memory as /10th of value
- * as /10th of the value
- * <num> represents the largest multiple of 10 that will still be displayable as
+ * <length> represents the length to rightbound the number
- * the first digit, so num = 10 will be 0-99 and so on
  * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
  */
-void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
+void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t length, uint8_t pad) {
+        char s[7];
+        itoa(number, s, 10 );
-                // if number is largar than 99[..]9 we must decrease it
+        for (uint8_t i = 0; i < length - strlen(s); i++) {
-                while (number >= (num * 10)) {
+                if (pad) write_char((x++)+(y * 30), 10);
-                        number -= num * 10;
+                else write_ascii_char((x++)+(y * 30), 0);
-                }
+        }
-                uint8_t started = 0;
+        char rest = s[strlen(s)-1];
-                while (num > 0) {
+        s[strlen(s)-1] = 0;
-                        uint8_t b = number / num;
-                        if (b > 0 || started || num == 1) {
-                                if ((num / 10) == 0) {
-                                        if (!started) write_ascii_char((x - 1)+(y * 30), '0');
+        if (number < 10) write_char((x-1)+(y * 30), 10); // zero
-                                        write_char((x++)+(y * 30), 65); // decimal point
-                                }
-                                write_ascii_char((x++)+(y * 30), '0' + b);
+        else write_ascii_string(x,  y, s);
-                            started = 1;
+        x += strlen(s);
-                        } else {
-                                if (pad) write_ascii_char((x++)+(y * 30), '0');
+        write_char((x++)+(y * 30), 65); // decimal point
-                                else write_ascii_char((x++)+(y * 30), ' ');
+        write_ascii_char((x++)+(y * 30), rest); // after dot
-                        }
-                        number -= b * num;
-                        num /= 10;
-                }
+}
 /**
- * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
+ * Write a signed <number> at <x>/<y> to MAX7456 display memory as /10th of value
- * as /10th of the value
- * <num> represents the largest multiple of 10 that will still be displayable as
+ * <length> represents the length to rightbound the number
- * the first digit, so num = 10 will be 0-99 and so on
  * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
  */
-void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
+void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t length, uint8_t pad) {
-    if (((uint16_t) number) > 32767) {
-        number = number - 65536;
-                num *= -1;
+        char s[7];
-                // if number is smaller than -99[..]9 we must increase it
-                while (number <= (num * 10)) {
+        itoa(number, s, 10 );
-                        number -= num * 10;
-                }
-                uint8_t started = 0;
-                while (num < 0) {
-                        uint8_t b = number / num;
+        for (uint8_t i = 0; i < length - strlen(s); i++) {
-                        if (pad) write_ascii_char((x)+(y * 30), '0');
+                if (pad) write_char((x++)+(y * 30), 10);
-                        if (b > 0 || started || num == 1) {
-                                if ((num / 10) == 0) {
-                                        if (!started) {
-                                                write_ascii_char((x - 2)+(y * 30), '-');
-                                                write_ascii_char((x - 1)+(y * 30), '0');
+                else write_char((x++)+(y * 30), 0);
-                                        }
+        }
-                                        write_char((x++)+(y * 30), 65); // decimal point
-                                } else if (!started) {
+        char rest = s[strlen(s)-1];
-                                        write_char((x - 1)+(y * 30), 0x49); // minus
+        s[strlen(s)-1] = 0;
-                                }
-                            write_ascii_char((x++)+(y * 30), '0' + b);
+        if (number < 10) write_char((x)+(y * 30), 10); // zero
-                            started = 1;
-                        } else {
+        else {
-                                write_ascii_char((x++)+(y * 30), 0);
+                write_ascii_string(x,  y, s);
-                        }
-                        number -= b * num;
-                        num /= 10;
-                }
+        }
-        } else {
+        x += strlen(s);
-        write_char((x)+(y * 30), 0);
+        write_char((x++)+(y * 30), 65); // decimal point
-        write_ndigit_number_u_10th(x, y, number, num, pad);
+        write_ascii_char((x++)+(y * 30), rest); // after dot
-    }
+}
 /**
  *  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_ndigit_number_u(x, y, min, 100, 0);
+    write_ndigit_number_u(x, y, min, 3, 0);
     write_char_xy(x + 3, y, 68);
-    write_ndigit_number_u(x + 4, y, seconds, 10, 1);
+    write_ndigit_number_u(x + 4, y, seconds, 2, 1);
+}
 /**
  * wirte a <position> at <x>/<y> assuming it is a gps position for long-/latitude
  */
 void write_gps_pos(uint8_t x, uint8_t y, int32_t position) {
         if (position < 0) {
                 position ^= ~0;
                 position++;
                 write_char_xy(x++, y, 0x49); // minus
         } else {
                 write_char_xy(x++, y, 0); // clear ('+' would be nice, maybe later)
+        }
-        write_ndigit_number_u(x, y, (uint16_t) (position / (int32_t) 10000000), 100, 1);
+        write_ndigit_number_u(x, y, (uint16_t) (position / (int32_t) 10000000), 3, 1);
         write_char_xy(x + 3, y, 65); // decimal point
         position = position - ((position / (int32_t) 10000000) * (int32_t) 10000000);
-        write_ndigit_number_u(x + 4, y, (uint16_t) (position / (int32_t) 1000), 1000, 1);
+        write_ndigit_number_u(x + 4, y, (uint16_t) (position / (int32_t) 1000), 4, 1);
         position = position - ((uint16_t) (position / (int32_t) 1000) * (int32_t) 1000);
-        write_ndigit_number_u(x + 8, y, (uint16_t) position, 100, 1);
+        write_ndigit_number_u(x + 8, y, (uint16_t) position, 3, 1);
         write_char_xy(x + 11, y, 0xD0); // degree symbol
+}
 #endif

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(root)/C-OSD/trunk/max7456_software_spi.c - Rev 514 → 519