-> mapping to an 1/x like behaviour

diff --git a/beginners/oneoverx.c b/beginners/oneoverx.c
new file mode 100644 (file)
index 0000000..8962bec
--- /dev/null
+++ b/beginners/oneoverx.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+int main(int argc,char **argv) {
+
+       int i;
+
+       double c,a,o,f;
+
+       a=atof(argv[1]);
+       c=(1.0-sqrt(1+4*a))/2.0; // -!
+       o=a/(1-c);
+
+       printf("; f(x) = a / (x+o)  +  c  (a:%f o:%f c:%f)\n",a,o,c);
+
+       for(i=255;i>=0;i--) {
+               f=a/(1.0*i/255+o)+c;
+               printf("; %d - %d\n",255-i,255-i+1);
+               printf(".db 0x%0x, ",(int)(f*255));
+               i-=1;
+               f=a/(1.0*i/255+o)+c;
+               printf("0x%0x\n",(int)(f*255));
+       }
+
+       return 0;
+}
+

diff --git a/beginners/rgb_moritz.asm b/beginners/rgb_moritz.asm
index bc3a72a..c3b3984 100644 (file)
--- a/beginners/rgb_moritz.asm
+++ b/beginners/rgb_moritz.asm
@@ -21,6 +21,9 @@
 .def rgb_level = r21
 .def rgb_dir = r22
 .def rgb_upd_cnt = r23
+.def r_map = r24
+.def g_map = r25
+.def b_map = r26
 .equ pin_red = 0x01
 .equ pin_green = 0x02
 .equ pin_blue = 0x04
@@ -107,6 +110,23 @@ mov green,tmp
 ldi tmp,mid
 mov blue,tmp
 
+; initial mapping intensities of intensities
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,red
+adc ZH,zero
+lpm r_map,Z
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,green
+adc ZH,zero
+lpm g_map,Z
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,blue
+adc ZH,zero
+lpm b_map,Z
+
 ; rgb propagation init
 ldi rgb_dir,0x04
 
@@ -180,6 +200,23 @@ sbrc rgb_dir,2
 sub blue,two
 add blue,one
 
+; update mapping
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,red
+adc ZH,zero
+lpm r_map,Z
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,green
+adc ZH,zero
+lpm g_map,Z
+ldi ZL,low(INTENSITIES*2)
+ldi ZH,high(INTENSITIES*2)
+add ZL,blue
+adc ZH,zero
+lpm b_map,Z
+
 ; power on the leds
 POWER_LEDS:
 mov rgb_level,zero
@@ -189,19 +226,19 @@ add rgb_upd_cnt,one
 
 CHECK_RED:
 
-cp count,red
+cp count,r_map
 brne CHECK_GREEN
 ori rgb_level,pin_red
 
 CHECK_GREEN:
 
-cp count,green
+cp count,g_map
 brne CHECK_BLUE
 ori rgb_level,pin_green
 
 CHECK_BLUE:
 
-cp count,blue
+cp count,b_map
 brne SET_PORTS
 ori rgb_level,pin_blue
 
@@ -214,3 +251,7 @@ add count,one
 
 reti
 
+; intensities
+INTENSITIES:
+.include "rgb_moritz_intensities.asm"
+

diff --git a/beginners/rgb_moritz_intensities.asm b/beginners/rgb_moritz_intensities.asm
new file mode 100644 (file)
index 0000000..815cfd4
--- /dev/null
+++ b/beginners/rgb_moritz_intensities.asm
@@ -0,0 +1,257 @@
+; f(x) = a / (x+o)  +  c  (a:0.100000 o:0.091608 c:-0.091608)
+; 0 - 1
+.db 0x0, 0x0
+; 2 - 3
+.db 0x0, 0x0
+; 4 - 5
+.db 0x0, 0x0
+; 6 - 7
+.db 0x0, 0x0
+; 8 - 9
+.db 0x0, 0x0
+; 10 - 11
+.db 0x0, 0x0
+; 12 - 13
+.db 0x1, 0x1
+; 14 - 15
+.db 0x1, 0x1
+; 16 - 17
+.db 0x1, 0x1
+; 18 - 19
+.db 0x1, 0x1
+; 20 - 21
+.db 0x1, 0x1
+; 22 - 23
+.db 0x2, 0x2
+; 24 - 25
+.db 0x2, 0x2
+; 26 - 27
+.db 0x2, 0x2
+; 28 - 29
+.db 0x2, 0x2
+; 30 - 31
+.db 0x2, 0x2
+; 32 - 33
+.db 0x3, 0x3
+; 34 - 35
+.db 0x3, 0x3
+; 36 - 37
+.db 0x3, 0x3
+; 38 - 39
+.db 0x3, 0x3
+; 40 - 41
+.db 0x3, 0x4
+; 42 - 43
+.db 0x4, 0x4
+; 44 - 45
+.db 0x4, 0x4
+; 46 - 47
+.db 0x4, 0x4
+; 48 - 49
+.db 0x4, 0x4
+; 50 - 51
+.db 0x5, 0x5
+; 52 - 53
+.db 0x5, 0x5
+; 54 - 55
+.db 0x5, 0x5
+; 56 - 57
+.db 0x5, 0x6
+; 58 - 59
+.db 0x6, 0x6
+; 60 - 61
+.db 0x6, 0x6
+; 62 - 63
+.db 0x6, 0x6
+; 64 - 65
+.db 0x6, 0x7
+; 66 - 67
+.db 0x7, 0x7
+; 68 - 69
+.db 0x7, 0x7
+; 70 - 71
+.db 0x7, 0x7
+; 72 - 73
+.db 0x8, 0x8
+; 74 - 75
+.db 0x8, 0x8
+; 76 - 77
+.db 0x8, 0x8
+; 78 - 79
+.db 0x9, 0x9
+; 80 - 81
+.db 0x9, 0x9
+; 82 - 83
+.db 0x9, 0x9
+; 84 - 85
+.db 0xa, 0xa
+; 86 - 87
+.db 0xa, 0xa
+; 88 - 89
+.db 0xa, 0xa
+; 90 - 91
+.db 0xb, 0xb
+; 92 - 93
+.db 0xb, 0xb
+; 94 - 95
+.db 0xb, 0xc
+; 96 - 97
+.db 0xc, 0xc
+; 98 - 99
+.db 0xc, 0xc
+; 100 - 101
+.db 0xd, 0xd
+; 102 - 103
+.db 0xd, 0xd
+; 104 - 105
+.db 0xd, 0xe
+; 106 - 107
+.db 0xe, 0xe
+; 108 - 109
+.db 0xe, 0xf
+; 110 - 111
+.db 0xf, 0xf
+; 112 - 113
+.db 0xf, 0xf
+; 114 - 115
+.db 0x10, 0x10
+; 116 - 117
+.db 0x10, 0x10
+; 118 - 119
+.db 0x11, 0x11
+; 120 - 121
+.db 0x11, 0x11
+; 122 - 123
+.db 0x12, 0x12
+; 124 - 125
+.db 0x12, 0x13
+; 126 - 127
+.db 0x13, 0x13
+; 128 - 129
+.db 0x13, 0x14
+; 130 - 131
+.db 0x14, 0x14
+; 132 - 133
+.db 0x15, 0x15
+; 134 - 135
+.db 0x15, 0x15
+; 136 - 137
+.db 0x16, 0x16
+; 138 - 139
+.db 0x16, 0x17
+; 140 - 141
+.db 0x17, 0x17
+; 142 - 143
+.db 0x18, 0x18
+; 144 - 145
+.db 0x19, 0x19
+; 146 - 147
+.db 0x19, 0x1a
+; 148 - 149
+.db 0x1a, 0x1a
+; 150 - 151
+.db 0x1b, 0x1b
+; 152 - 153
+.db 0x1c, 0x1c
+; 154 - 155
+.db 0x1c, 0x1d
+; 156 - 157
+.db 0x1d, 0x1e
+; 158 - 159
+.db 0x1e, 0x1f
+; 160 - 161
+.db 0x1f, 0x20
+; 162 - 163
+.db 0x20, 0x21
+; 164 - 165
+.db 0x21, 0x22
+; 166 - 167
+.db 0x22, 0x23
+; 168 - 169
+.db 0x23, 0x24
+; 170 - 171
+.db 0x24, 0x25
+; 172 - 173
+.db 0x25, 0x26
+; 174 - 175
+.db 0x26, 0x27
+; 176 - 177
+.db 0x28, 0x28
+; 178 - 179
+.db 0x29, 0x2a
+; 180 - 181
+.db 0x2a, 0x2b
+; 182 - 183
+.db 0x2c, 0x2c
+; 184 - 185
+.db 0x2d, 0x2e
+; 186 - 187
+.db 0x2f, 0x2f
+; 188 - 189
+.db 0x30, 0x31
+; 190 - 191
+.db 0x32, 0x33
+; 192 - 193
+.db 0x33, 0x34
+; 194 - 195
+.db 0x35, 0x36
+; 196 - 197
+.db 0x37, 0x38
+; 198 - 199
+.db 0x39, 0x3a
+; 200 - 201
+.db 0x3b, 0x3c
+; 202 - 203
+.db 0x3d, 0x3e
+; 204 - 205
+.db 0x40, 0x41
+; 206 - 207
+.db 0x42, 0x43
+; 208 - 209
+.db 0x45, 0x46
+; 210 - 211
+.db 0x47, 0x49
+; 212 - 213
+.db 0x4a, 0x4c
+; 214 - 215
+.db 0x4d, 0x4f
+; 216 - 217
+.db 0x50, 0x52
+; 218 - 219
+.db 0x54, 0x56
+; 220 - 221
+.db 0x58, 0x5a
+; 222 - 223
+.db 0x5c, 0x5e
+; 224 - 225
+.db 0x60, 0x62
+; 226 - 227
+.db 0x64, 0x67
+; 228 - 229
+.db 0x69, 0x6c
+; 230 - 231
+.db 0x6f, 0x71
+; 232 - 233
+.db 0x74, 0x77
+; 234 - 235
+.db 0x7b, 0x7e
+; 236 - 237
+.db 0x82, 0x85
+; 238 - 239
+.db 0x89, 0x8d
+; 240 - 241
+.db 0x92, 0x96
+; 242 - 243
+.db 0x9b, 0xa0
+; 244 - 245
+.db 0xa5, 0xab
+; 246 - 247
+.db 0xb1, 0xb7
+; 248 - 249
+.db 0xbe, 0xc6
+; 250 - 251
+.db 0xcd, 0xd6
+; 252 - 253
+.db 0xdf, 0xe9
+; 254 - 255
+.db 0xf3, 0xff