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/*
* Atmel Mega8 based LMD18245 controller
* Lookup table generator
*
* Copyright (c) 2009-2020 Michael Buesch <m@bues.ch>
*
* 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;
unsigned int count;
unsigned char *buf;
buf = malloc(nr_steps * 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 * (double)count) / ((double)nr_steps * 2.0);
s = fabs(sin(pos)) * (double)0xF;
lmd1 = (unsigned int)round(s) & 0xFu;
s = fabs(cos(pos)) * (double)0xF;
lmd2 = (unsigned int)round(s) & 0xFu;
buf[count] = lmd1 | (lmd2 << 4);
}
/* Print the lookup table. */
printf("steptable:\n");
for (count = 0; count < nr_steps * 2; count++) {
if (count % 8 == 0)
printf("%s.db 0x%02X", count ? "\n" : "", buf[count]);
else
printf(", 0x%02X", buf[count]);
}
printf("\n\n");
free(buf);
return 0;
}
int main(int argc, char **argv)
{
unsigned long nr_steps;
int err;
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 < 2 || nr_steps > 60) {
fprintf(stderr, "Please select a step count between 2 and 60\n");
return 1;
}
printf("; THIS FILE IS GENERATED. DO NOT EDIT.\n");
printf("\n\n");
printf(".equ NR_STEPS=%lu\n", nr_steps);
printf("\n");
printf(".cseg\n");
err = gen_lmd_tab(nr_steps);
if (err)
return 1;
printf("; For reference store the build parameters in the binary image\n");
printf(".cseg\n");
printf(".db 0,0,0,0\n");
printf(".db \"NR_STEPS=%lu\"%s\n", nr_steps, ((nr_steps > 9) ? ",0" : ""));
printf(".db 0,0,0,0\n");
printf(".db \"BUILD_DATE=%04u.%02u.%02u\",0\n",
(unsigned int)COMPILE_YEAR,
(unsigned int)COMPILE_MONTH,
(unsigned int)COMPILE_DAY);
printf("\n");
return 0;
}
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