(root)/C-OSD/trunk/max7456_software_spi.c - Rev 2536
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/****************************************************************************
* Copyright (C) 2009-2016 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 "main.h"
#include <avr/io.h>
#include <util/delay.h>
#include <avr/pgmspace.h>
#include <string.h>
#include <stdlib.h>
#include "max7456_software_spi.h"
#include "usart0.h"
char conv_array
[7]; // general array for number -> char conversation
int int_pow
(int a
, int b
) {
if (b
<= 0) return 1;
int res
= 1;
while (b
-- > 0) res
*= a
;
return res
;
}
/* ##########################################################################
* 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 :)
*/
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
#ifdef SERIALDEBUGDRAW
uint8_t c
= address
+ byte
;
usart0_puts
("#3");
usart0_putc
(address
);
usart0_putc
(byte
);
usart0_putc
(c
);
usart0_puts
("\n");
#endif
}
/**
* write a <character> to <address> of MAX7456 display memory
*/
void write_char
(uint16_t address
, char character
) {
spi_send_byte
(MAX7456_DMAH
, (address
& 0xFF00) >> 8);
spi_send_byte
(MAX7456_DMAL
, (address
& 0x00FF));
spi_send_byte
(MAX7456_DMDI
, character
);
}
/**
* 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
(MAX7456_DMM
, 0b01000100);
// clearing takes 20us according to maxim so lets wait longer
_delay_us
(21);
}
#if (ALLCHARSDEBUG|(WRITECHARS != -1))
/**
* 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;
}
}
}
/**
* let the MAX7456 learn a new character at <number>
* with <data>.
*/
void learn_char
(uint8_t number
, unsigned char* data
) {
// select character to write
spi_send_byte
(MAX7456_CMAH
, number
);
for (uint8_t i
= 0; i
< 54; i
++) {
// select 4pixel byte of char
spi_send_byte
(MAX7456_CMAL
, i
);
// write 4pixel byte of char
spi_send_byte
(MAX7456_CMDI
, data
[i
]);
}
// write to the NVM array from the shadow RAM
spi_send_byte
(MAX7456_CMM
, 0b10100000);
// according to maxim writing to nvram takes about 12ms, lets wait longer
_delay_ms
(120);
}
#endif
#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
(MAX7456_DMAH
, ((address
& 0xFF00) >> 8) | 2);
spi_send_byte
(MAX7456_DMAL
, (address
& 0x00FF));
spi_send_byte
(MAX7456_DMDI
, attribute
);
}
/**
* 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
);
}
/**
* 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
= 73; // remap minus
else if (c
== ';') c
= 67; // remap
else if (c
== ':') c
= 68; // remap
else if (c
== ',') c
= 69; // remap
else if (c
== '?') c
= 66; // remap
else if (c
== '\\') c
= 70; // remap
else if (c
== '_') c
= 0xE3; // remap
else if (c
== '/') c
= 71; // remap
else if (c
== '"') c
= 72; // remap
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> with lenght <len> at <x>/<y> to MAX7456 display memory
*/
void write_ascii_string_len
(uint8_t x
, uint8_t y
, char *string
, uint8_t len
) {
while (len
--) {
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 a unsigned <number> at <x>/<y> to MAX7456 display memory
* <length> represents the length to rightbound the number
* <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 length
, uint8_t pad
) {
if (number
>= int_pow
(10, length
)) {
number
= int_pow
(10, length
) - 1;
}
itoa(number
, conv_array
, 10);
for (uint8_t i
= 0; i
< length
- strlen(conv_array
); i
++) {
if (pad
) write_char
((x
++)+(y
* 30), 10);
else write_ascii_char
((x
++)+(y
* 30), 0);
}
write_ascii_string
(x
, y
, conv_array
);
}
/**
* Write a signed <number> at <x>/<y> to MAX7456 display memory
* <length> represents the length to rightbound the number
* <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 length
, uint8_t pad
) {
if (number
<= -int_pow
(10, length
)) {
number
= -int_pow
(10, length
) + 1;
} else if (number
>= int_pow
(10, length
)) {
number
= int_pow
(10, length
) - 1;
}
itoa(number
, conv_array
, 10);
if (strlen(conv_array
) < length
) {
for (uint8_t i
= 0; i
< length
- strlen(conv_array
); i
++) {
if (pad
) write_char
((x
++)+(y
* 30), 10);
else write_ascii_char
((x
++)+(y
* 30), 0);
}
}
write_ascii_string
(x
, y
, conv_array
);
}
/**
* Write a unsigned <number> at <x>/<y> to MAX7456 display memory as /10th of value
* <length> represents the length to rightbound the number
* <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 length
, uint8_t pad
) {
if (number
>= int_pow
(10, length
)) {
number
= int_pow
(10, length
) - 1;
}
itoa(number
, conv_array
, 10);
uint8_t len
= strlen(conv_array
);
for (uint8_t i
= 0; i
< length
- len
; i
++) {
if (pad
) write_char
((x
++)+(y
* 30), 10); // zero
else write_char
((x
++)+(y
* 30), 0); // blank
}
char rest
= conv_array
[len
- 1];
conv_array
[len
- 1] = 0;
if (len
== 1) {
write_char
((x
- 1)+(y
* 30), 10); // zero
} else if (len
== 2 && conv_array
[0] == '-') {
write_char
((x
- 1)+(y
* 30), 0x49); // minus
write_char
((x
)+(y
* 30), 10); // zero
} else {
write_ascii_string
(x
, y
, conv_array
);
}
x
+= len
- 1;
write_char
((x
++)+(y
* 30), 65); // decimal point
write_ascii_char
((x
++)+(y
* 30), rest
); // after dot
}
/**
* Write a signed <number> at <x>/<y> to MAX7456 display memory as /10th of value
* <length> represents the length to rightbound the number
* <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 length
, uint8_t pad
) {
if (number
>= int_pow
(10, length
)) {
number
= int_pow
(10, length
) - 1;
}
itoa(number
, conv_array
, 10);
uint8_t len
= strlen(conv_array
);
for (uint8_t i
= 0; i
< length
- len
; i
++) {
if (pad
) write_char
((x
++)+(y
* 30), 10); // zero
else write_char
((x
++)+(y
* 30), 0); // blank
}
char rest
= conv_array
[len
- 1];
conv_array
[len
- 1] = 0;
if (len
== 1) {
write_char
((x
- 1)+(y
* 30), 10); // zero
} else if (len
== 2 && conv_array
[0] == '-') {
write_char
((x
- 1)+(y
* 30), 0x49); // minus
write_char
((x
)+(y
* 30), 10); // zero
} else {
write_ascii_string
(x
, y
, conv_array
);
}
x
+= len
- 1;
write_char
((x
++)+(y
* 30), 65); // decimal point
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
, 3, 0);
write_char_xy
(x
+ 3, y
, 68);
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), 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), 4, 1);
position
= position
- ((uint16_t)(position
/ (int32_t)1000) * (int32_t)1000);
write_ndigit_number_u
(x
+ 8, y
, (uint16_t)position
, 3, 1);
write_char_xy
(x
+ 11, y
, 0xD0); // degree symbol
}
#endif