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/*
* Atmel Mega8 based ODIN chipset
* Lookup table generator
*
* Copyright (c) 2009 Michael Buesch <mb@bu3sch.de>
*
* 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, or (at your option) any later version.
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#undef M_PI
#define M_PI 3.14159265358979323846264338327
#define COMPILE_YEAR ((((__DATE__[7] - '0') * 10 + \
(__DATE__[8] - '0')) * 10 + \
(__DATE__[9] - '0')) * 10 + \
(__DATE__[10] - '0'))
#define COMPILE_MONTH ((__DATE__[2] == 'n' ? (__DATE__[1] == 'a' ? 0 : 5) \
: __DATE__[2] == 'b' ? 1 \
: __DATE__[2] == 'r' ? (__DATE__[0] == 'M' ? 2 : 3) \
: __DATE__[2] == 'y' ? 4 \
: __DATE__[2] == 'l' ? 6 \
: __DATE__[2] == 'g' ? 7 \
: __DATE__[2] == 'p' ? 8 \
: __DATE__[2] == 't' ? 9 \
: __DATE__[2] == 'v' ? 10 : 11) + 1)
#define COMPILE_DAY ((__DATE__[4] == ' ' ? 0 : __DATE__[4] - '0') * 10 + \
(__DATE__[5] - '0'))
static int gen_lmd_tab(unsigned int nr_steps)
{
double pos;
double s;
unsigned int lmd1, lmd2, polarity;
unsigned int count;
int row, col;
unsigned char *buf;
buf = malloc(nr_steps * 2 * 2);
if (!buf) {
fprintf(stderr, "Out of memory.\n");
return 1;
}
/* Generate the lookup table. */
/* sin() takes radians as arg. pi rad == 180deg */
for (count = 0; count < nr_steps * 2; count++) {
pos = M_PI / (nr_steps * 2) * count;
polarity = 0;
s = sin(pos);
s = s * 0xF;
lmd1 = (unsigned int)round(s) & 0xF;
polarity |= 1;
s = cos(pos);
if (s < 0)
s = -s;
else
polarity |= 2;
s = s * 0xF;
lmd2 = (unsigned int)round(s) & 0xF;
lmd2 <<= 4;
buf[count * 2] = lmd1 | lmd2;
buf[count * 2 + 1] = polarity;
}
/* Print a diagram. */
for (row = 15; row >= -15; row--) {
printf("; %3d | ", row);
for (col = 0; col < nr_steps * 2; col++) {
char c = ' ';
int l1, l2;
unsigned char polarity;
l1 = buf[col * 2] & 0xF;
l2 = buf[col * 2] >> 4;
polarity = buf[col * 2 + 1];
if (!(polarity & 1))
l1 = -l1;
if (!(polarity & 2))
l2 = -l2;
if (l1 == row)
c = '&';
if (l2 == row)
c = '$';
putchar(c);
}
putchar('\n');
}
printf("; L-");
for (col = 0; col < nr_steps * 2; col++)
putchar('-');
printf("\n; ");
for (col = 0; col < nr_steps * 2; col += 4)
printf("%-4u", col);
putchar('\n');
/* Print the lookup table. */
printf("steptable:\n");
for (count = 0; count < nr_steps * 2; count++) {
unsigned int a, b;
int l1, l2;
a = buf[count * 2];
b = buf[count * 2 + 1];
l1 = a & 0xF;
if (!(b & 1))
l1 = -l1;
l2 = a >> 4;
if (!(b & 2))
l2 = -l2;
printf(".db 0x%02X, 0x%02X ; LMD1 = %3d, LMD2 = %3d\n",
a, b, l1, l2);
}
printf("\n");
free(buf);
return 0;
}
int main(int argc, char **argv)
{
unsigned long nr_steps;
unsigned int i;
char buf[32];
if (argc != 2) {
fprintf(stderr, "Usage: %s NR_OF_STEPS\n", argv[0]);
return 1;
}
nr_steps = strtoul(argv[1], NULL, 10);
if (nr_steps < 1 || nr_steps > 60) {
fprintf(stderr, "Please select a step count between 1 and 60\n");
return 1;
}
printf("; THIS FILE IS GENERATED. DO NOT EDIT.\n");
printf("\n");
printf(".equ NR_STEPS = %lu\n", nr_steps);
snprintf(buf, sizeof(buf), "%02lu", nr_steps);
printf(".equ NR_STEPS_ASCII_0 = %u ; ASCII %c\n",
(unsigned int)buf[0], (unsigned int)buf[0]);
printf(".equ NR_STEPS_ASCII_1 = %u ; ASCII %c\n",
(unsigned int)buf[1], (unsigned int)buf[1]);
snprintf(buf, sizeof(buf), "%04u.%02u.%02u",
COMPILE_YEAR, COMPILE_MONTH, COMPILE_DAY);
for (i = 0; i < 10; i++) {
printf(".equ BDATE%u = %u ; ASCII %c\n",
i, (unsigned int)buf[i], (unsigned int)buf[i]);
}
printf(".cseg\n");
printf("\n");
return gen_lmd_tab(nr_steps);
}
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