Hi,
This patch add a new file to the DS2408 LCD_H/ directory: redefchar
It allows to redefine up to 8 chars corresponding to the ASCII codes 0
to 7. Once the chars are redefined, they can be displayed with screen*
functions.
The format of the entry follows:
- each character definition is 17 bytes long (several characters can be
defined at one time by concatenating their definition)
- first char is the index of the redefined character: '0' -> '7' (human
form) or '\0' -> '\10' (binary form)
- 16 others define the 8 lines of each character, a pair of hexadecimal
digit for each char between "00" and "1F" (or "1f", but see the note at
the end). When a bit is set the corresponding pixel is on. For example:
18421 <- bits columns
..... => "00"
..#.. => "04"
.#.#. => "0A" (because 8 + 2)
#...# => "11"
#...# => "11"
.#.#. => "0A" (because 8 + 2)
..#.. => "04"
..... => "00"
So to define this character on ascii code '\1', we will use the string:
"100040A11110A0400"
Other examples:
- an empty square on char '\6': "61F1111111111111F"
##### => "1F"
#...# => "11"
#...# => "11"
#...# => "11"
#...# => "11"
#...# => "11"
#...# => "11"
##### => "1F"
- a hourglass on char '\3' : "31F1F0E04040E1F1F"
##### => "1F"
##### => "1F"
.###. => "0E"
..#.. => "04"
..#.. => "04"
.###. => "0E"
##### => "1F"
##### => "1F"
- both in one write : "61F1111111111111F31F1F0E04040E1F1F"
Note that if redefined chars are already displayed on the LCD,
redefining them again will change all of them on the display. This
behavior is hard-coded in the LCD.
Note that one can redefine the character '\0' but it is not always easy
to manipulate it and/or to display it due to libraries or interfaces
constraints (like null terminated string handling)...
Lastly, this code use the function hex_digit() in ow_bae.c. This
function does not work well for lower case hexadecimal digits, except if
you apply the "ow_bae.c patch" I posted this morning.
Best regards,
Max.
--- owfs-2.8p14/module/owlib/src/c/ow_2408.c.orig 2012-01-09
23:02:05.000000000 +0100
+++ owfs-2.8p14/module/owlib/src/c/ow_2408.c 2012-03-11 12:11:16.000000000
+0100
@@ -86,6 +86,7 @@
WRITE_FUNCTION(FS_Hscreenyx);
WRITE_FUNCTION(FS_Hmessage);
WRITE_FUNCTION(FS_Honoff);
+WRITE_FUNCTION(FS_Hredefchar);
#define PROPERTY_LENGTH_LCD_MESSAGE 128
@@ -113,6 +114,7 @@
{"LCD_H/screenyx", PROPERTY_LENGTH_LCD_MESSAGE, NON_AGGREGATE,
ft_ascii, fc_stable, NO_READ_FUNCTION, FS_Hscreenyx, VISIBLE,
NO_FILETYPE_DATA,},
{"LCD_H/message", PROPERTY_LENGTH_LCD_MESSAGE, NON_AGGREGATE, ft_ascii,
fc_stable, NO_READ_FUNCTION, FS_Hmessage, VISIBLE, NO_FILETYPE_DATA,},
{"LCD_H/onoff", PROPERTY_LENGTH_UNSIGNED, NON_AGGREGATE, ft_unsigned,
fc_stable, NO_READ_FUNCTION, FS_Honoff, VISIBLE, NO_FILETYPE_DATA,},
+ {"LCD_H/redefchar", PROPERTY_LENGTH_LCD_MESSAGE, NON_AGGREGATE,
ft_ascii, fc_stable, NO_READ_FUNCTION, FS_Hredefchar, VISIBLE,
NO_FILETYPE_DATA,},
};
DeviceEntryExtended(29, DS2408, DEV_alarm | DEV_resume | DEV_ovdr,
NO_GENERIC_READ, NO_GENERIC_WRITE);
@@ -583,6 +585,63 @@
return 0;
}
+// (xL1..L8)+
+// x = character index from '0' to '7' OR from '\0' to '\10'
+// Ln = hexa double digit for each line from "00" to "1f"
+extern int hex_digit(BYTE c); // from ow_bae.c
+static ZERO_OR_ERROR FS_Hredefchar(struct one_wire_query *owq)
+{
+ struct parsedname *pn = PN(owq);
+ char *buf = OWQ_buffer(owq);
+ size_t size = OWQ_size(owq);
+ BYTE data[size * 2]; // worst case
+ size_t i, j, k;
+ int num;
+
+ RETURN_ERROR_IF_BAD( OW_Hinit(pn) ) ;
+
+ if (size < 17) {
+ return -EINVAL;
+ }
+
+ i = j = 0;
+ do {
+ if (*buf < '0' || *buf > '7') {
+ if (*buf <= 7) {
+ num = buf[i++]; // binary
+ } else {
+ LEVEL_DEBUG("Can only redefine chars from 0 to
7");
+ return -EINVAL ;
+ }
+ } else {
+ num = buf[i++] - '0';
+ }
+
+ num *= 8;
+ num += 0x40;
+
+ data[j++] = (num & 0xF0);
+ data[j++] = (num << 4) & 0xF0;
+
+ // The eigth definition lines (2 hex digits / line)
+ for (k = i + 16; i < k; i += 2) {
+ num = hex_digit(buf[i]) * 16 + hex_digit(buf[i + 1]);
+ if (num < 0 || num > 0x1f) {
+ LEVEL_DEBUG("A redef char line must be a
hexadecimal integer < 0x1f");
+ return -EINVAL ;
+ }
+
+ data[j++] = (num & 0xF0) | 0x08;
+ data[j++] = ((num << 4) & 0xF0) | 0x08;
+ }
+
+ size -= 17;
+ }
+ while (size >= 17);
+
+ return GB_to_Z_OR_E( OW_w_pios(data, j, pn) ) ;
+}
+
/* Read 6 bytes --
0x88 PIO logic State
0x89 PIO output Latch state
------------------------------------------------------------------------------
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