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ubb-patgen/: UBB-based pattern generator (WIP)
For now, it only knows to synthesize the clock and to output it.
This commit is contained in:
Werner Almesberger
parent
7c1f06530d
commit
52ce1947c5
34
ubb-patgen/Makefile
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34
ubb-patgen/Makefile
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#
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# ubb-patgen/Makefile - Build the UBB pattern generator
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#
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# Written 2013 by Werner Almesberger
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# Copyright 2013 Werner Almesberger
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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CC = mipsel-openwrt-linux-gcc
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CFLAGS = -g -Wall -O9 -I../libubb/include
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LDFLAGS =
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LDLIBS = -L../libubb -lubb -lm
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MAIN = ubb-patgen
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OBJS = ubb-patgen.o
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.PHONY: all static clean spotless
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all: $(MAIN)
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static:
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$(MAKE) LDFLAGS=-static
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$(MAIN): $(OBJS)
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clean:
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rm -f $(OBJS)
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spotless: clean
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rm -f $(MAIN)
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265
ubb-patgen/ubb-patgen.c
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265
ubb-patgen/ubb-patgen.c
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/*
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* ubb-patgen.c - UBB pattern generator
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*
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* Written 2013 by Werner Almesberger
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* Copyright 2013 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include <ubb/ubb.h>
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#include <ubb/mmcclk.h>
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/* ----- List available bus clock frequencies ------------------------------ */
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static int cmp(const void *a, const void *b)
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{
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const struct mmcclk *ma = a, *mb = b;
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if (ma->bus_clk_hz < mb->bus_clk_hz)
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return -1;
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if (ma->bus_clk_hz > mb->bus_clk_hz)
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return 1;
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return mb->clkdiv-ma->clkdiv;
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}
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static struct mmcclk *frequencies(int *n)
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{
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struct mmcclk mmc;
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struct mmcclk *clks = malloc(sizeof(struct mmcclk));
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int n_clks = 1;
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if (!clks) {
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perror("malloc");
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exit(1);
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}
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mmcclk_first(&mmc, 0);
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clks[0] = mmc;
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while (mmcclk_next(&mmc)) {
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clks = realloc(clks, sizeof(struct mmcclk)*(n_clks+1));
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if (!clks) {
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perror("realloc");
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exit(1);
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}
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clks[n_clks] = mmc;
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n_clks++;
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}
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qsort(clks, n_clks, sizeof(*clks), cmp);
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*n = n_clks;
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return clks;
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}
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static void print_freq(FILE *file, double f)
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{
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const char *prefix = "";
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if (f >= 1000000) {
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f /= 1000000;
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prefix = "M";
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} else if (f >= 1000) {
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f /= 1000;
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prefix = "k";
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}
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fprintf(file, "%g %sHz", f, prefix);
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}
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static void show_frequencies(void)
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{
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const struct mmcclk *clks;
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int n, i;
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clks = frequencies(&n);
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for (i = 0; i != n; i++) {
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printf("clkdiv = %u, clkrt = %u, bus_clk = ",
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clks[i].clkdiv, clks[i].clkrt);
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print_freq(stdout, clks[i].bus_clk_hz);
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putchar('\n');
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}
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free((void *) clks);
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}
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static int select_freq(struct mmcclk *res, int hz, int rel)
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{
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const struct mmcclk *clks, *p, *best = NULL;
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double d, best_d = 0;
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int n;
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clks = frequencies(&n);
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for (p = clks; p != clks+n; p++) {
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if (rel > 0 && p->bus_clk_hz < hz)
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continue;
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if (rel < 0 && p->bus_clk_hz > hz)
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continue;
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d = fabs(p->bus_clk_hz-hz);
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if (!best || d < best_d) {
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best = p;
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best_d = d;
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}
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}
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if (!best)
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return 0;
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*res = *best;
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free((void *) clks);
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return 1;
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}
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/* ----- Command-line processing ------------------------------------------- */
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static int frequency(const char *s, int *hz, int *rel)
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{
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char *end;
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double f;
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f = strtod(s, &end);
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switch (*end) {
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case 'M':
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case 'm':
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*hz = f*1000000;
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end++;
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break;
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case 'K':
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case 'k':
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*hz = f*1000;
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end++;
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break;
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default:
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*hz = f;
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break;
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}
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if ((end[0] == 'H' || end[0] == 'h') &&
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(end[1] == 'Z' || end[1] == 'z'))
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end += 2;
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switch (*end) {
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case '+':
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*rel = 1;
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end++;
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break;
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case '-':
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*rel = -1;
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end++;
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break;
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default:
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*rel = 0;
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break;
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}
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return !*end;
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s\n"
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"usage: %s [-b freq_hz] [-c] [-q] active_s\n\n"
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" -b freq_hz set bus clock to the specified frequency (default: 1 MHz)\n"
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" -c output bus clock on CLK\n"
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" -q quiet. Don't report clock differences.\n\n"
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" active_s keep running that many seconds after setting the clock\n\n"
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"Frequency: the frequency in Hz, optionally followed by \"M\" or \"k\",\n"
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" optionally followed by \"Hz\", optionally followed by \"+\" or \"-\".\n"
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" \"+\" selects a frequency >= the specified one, \"-\" one <=.\n"
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" Without +/-, the closest available frequency is selected.\n"
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, name, name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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struct mmcclk clk;
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int bus_hz = 1000000, clkout = 0, rel = 0;
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int quiet = 0;
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double active_s;
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struct timespec active_ns;
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char *end;
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int c;
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while ((c = getopt(argc, argv, "b:cq")) != EOF)
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switch (c) {
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case 'b':
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if (!frequency(optarg, &bus_hz, &rel))
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usage(*argv);
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break;
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case 'c':
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clkout = 1;
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break;
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case 'q':
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quiet = 1;
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break;
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default:
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usage(*argv);
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}
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switch (argc-optind) {
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case 0:
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if (clkout || quiet)
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usage(*argv);
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ubb_open(UBB_ALL);
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show_frequencies();
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return 1;
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case 1:
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active_s = strtod(argv[optind], &end);
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if (*end)
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usage(*argv);
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active_ns.tv_sec = (int) active_s;
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active_ns.tv_nsec = (active_s-(int) active_s)*1e9;
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break;
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default:
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usage(*argv);
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}
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ubb_open(UBB_ALL);
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if (!select_freq(&clk, bus_hz, rel)) {
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fprintf(stderr, "no suitable frequency found\n");
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exit(1);
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}
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if (clk.bus_clk_hz != bus_hz && !quiet) {
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double err;
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fprintf(stderr, "bus clk = ");
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print_freq(stderr, clk.bus_clk_hz);
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err = (clk.bus_clk_hz-bus_hz)/bus_hz;
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if (err <= -0.0001 || err >= 0.0001)
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fprintf(stderr, " (%+.2g%%)\n", err*100);
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else
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fprintf(stderr, " (%+d ppm)\n", (int) (err*1000000));
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}
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if (clkout)
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PDFUNS = UBB_CLK;
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mmcclk_start(&clk);
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if (nanosleep(&active_ns, NULL))
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perror("nanosleep");
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mmcclk_stop();
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ubb_close(0);
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return 0;
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}
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