atrf-path: added basic graphical output

- gui.h, gui.c: plot sweep results with SDL_gfx
- Makefile: added target-specific variables for SDL and SDL_gfx
- atrf-path.c (main): invoke the GUI if the number of sweeps is zero

tools/atrf-path/Makefile

@@ -14,3 +14,15 @@
 MAIN = atrf-path
 
 include ../Makefile.common
+
+CFLAGS_host += $(shell sdl-config --cflags)
+MACROS_host += -DHAVE_GFX
+LDLIBS_host += $(shell sdl-config --libs) -lSDL_gfx
+OBJS_host = gui.o
+
+CFLAGS_ben_jlime += $(shell sdl-config --cflags)
+MACROS_ben_jlime += -DHAVE_GFX
+LDLIBS_ben_jlime += -lSDL -lSDL_gfx
+OBJS_ben_jlime = gui.o
+
+$(MAIN):	$(OBJS_$(TARGET))

tools/atrf-path/atrf-path.c

@@ -21,6 +21,7 @@
 #include "cwtest.h"
 #include "atrf.h"
 
+#include "gui.h"
 #include "sweep.h"
 
 
@@ -211,7 +212,10 @@ int main(int argc, char **argv)
 		return 1;
 
 	sweep.power = 15-power;
-	do_sweeps(&sweep, sweeps);
+	if (sweeps)	/* @@@ hack */
+		do_sweeps(&sweep, sweeps);
+	else
+		gui(&sweep);
 
 	atrf_reg_write(sweep.tx, REG_TRX_STATE, TRX_CMD_TRX_OFF);
 	atrf_reg_write(sweep.rx, REG_TRX_STATE, TRX_CMD_TRX_OFF);

tools/atrf-path/gui.c

@@ -0,0 +1,112 @@
+/*
+ * atrf-path/gui.c - Graphical output for atrf-path
+ *
+ * Written 2011 by Werner Almesberger
+ * Copyright 2011 Werner Almesberger
+ *
+ * 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.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "SDL.h"
+#include "SDL_gfxPrimitives.h"
+
+#include "at86rf230.h"
+#include "atrf.h"
+#include "misctxrx.h"
+
+#include "sweep.h"
+#include "gui.h"
+
+
+#define	XRES	320
+#define	YRES	240
+
+#define	N_CHAN	16
+
+
+#define	FG_RGBA		0xffffffff	/* measurement color */
+
+#define	CHAN_STEP	20	/* 4 pixels/MHz */
+#define	SIDE_STEP	2
+#define	CHAN_X_OFFSET	10
+#define	Y_MIN		-94
+#define	Y_MAX		-10
+
+
+static void segment(SDL_Surface *s, int *last_x, int *last_y, int x,
+    const struct sample *res, int have_last)
+{
+	int y = YRES-(res->avg-Y_MIN)/(Y_MAX-Y_MIN)*YRES-1;
+
+	if (have_last) {
+		aalineColor(s, *last_x, *last_y, x, y, FG_RGBA);
+}
+	*last_x = x;
+	*last_y = y;
+}
+
+
+static void draw(SDL_Surface *s, const struct sample *res)
+{
+	int last_x, last_y;
+	int x, i;
+
+	x = CHAN_X_OFFSET;
+	for (i = 0; i != N_CHAN; i++) {
+		segment(s, &last_x, &last_y, x, res++, i);
+		x += 2*SIDE_STEP;
+		segment(s, &last_x, &last_y, x, res++, 1);
+		x += CHAN_STEP-2*SIDE_STEP;
+	}
+}
+
+
+static void clear(SDL_Surface *s)
+{
+	SDL_FillRect(s, NULL, SDL_MapRGB(s->format, 0, 0, 0));
+}
+
+
+void gui(const struct sweep *sweep)
+{
+	SDL_Surface *surf;
+	SDL_Event event;
+
+	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+		fprintf(stderr, "SDL_init: %s\n", SDL_GetError());
+		exit(1);
+	}
+	atexit(SDL_Quit);
+
+	surf = SDL_SetVideoMode(XRES, YRES, 0, SDL_SWSURFACE);
+	if (!surf) {
+		fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
+		exit(1);
+	}
+
+	while (1) {
+		struct sample res[N_CHAN*2];
+
+		while (SDL_PollEvent(&event))
+			if (event.type == SDL_KEYDOWN ||
+			    event.type == SDL_QUIT)
+				return;
+		do_sweep(sweep, res);
+
+		SDL_LockSurface(surf);
+
+		clear(surf);
+		draw(surf, res);
+
+		SDL_UnlockSurface(surf);
+		SDL_UpdateRect(surf, 0, 0, 0, 0);
+	}
+}

tools/atrf-path/gui.h

@@ -0,0 +1,27 @@
+/*
+ * atrf-path/gui.h - Graphical output for atrf-path
+ *
+ * Written 2011 by Werner Almesberger
+ * Copyright 2011 Werner Almesberger
+ *
+ * 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.
+ */
+
+#ifndef GUI_H
+#define GUI_H
+
+#include <stdlib.h>
+
+#include "sweep.h"
+
+
+#ifdef HAVE_GFX
+void gui(const struct sweep *sweep);
+#else
+#define gui(sweep) abort()
+#endif
+
+#endif /* !GUI_H */