From 5bb086e0e8a535d5ae79a62af62e11512be1ffca Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Thu, 31 Jan 2013 00:47:14 -0300
Subject: [PATCH] ubb-la/: display sample rate and sample interval in the GUI

---
 ubb-la/gui.c    | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 ubb-la/gui.h    |  2 +-
 ubb-la/try.c    |  5 +++--
 ubb-la/ubb-la.c |  7 ++++---
 4 files changed, 55 insertions(+), 7 deletions(-)

diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index 990fafa..d8d538e 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -35,6 +35,7 @@
 #define XRES	320	/* canvas width */
 #define YRES	240	/* canvas height */
 
+#define	TEXT_RGBA	0xffffffff	/* general text */
 #define	MAP_BUF_RGBA	0x808080ff	/* buffer in the map */
 #define	MAP_VIEW_RGBA	0xffffffff	/* current view in the map */
 #define	LEVEL_RGBA	0xffff00ff	/* constant level or single change */
@@ -55,6 +56,11 @@
 
 #define	MAX_ZOOM	3
 
+#define	FREQ_X		0
+#define	FREQ_Y		220
+#define	INTERVAL_X	0
+#define	INTERVAL_Y	230
+
 #define	REPEAT_DELAY_MS		300
 #define	REPEAT_INTERVAL_MS	30
 
@@ -297,6 +303,45 @@ static void show_buffer(const uint8_t *buf, int skip, int nibbles,
 }
 
 
+/* ----- Display the sample frequency -------------------------------------- */
+
+
+static void si_text(int x, int y, double v, const char *unit)
+{
+	const char *pfx;
+
+	if (v >= 1e6) {
+		v /= 1e6;
+		pfx = "M";
+	} else if (v >= 1e3) {
+		v /= 1e3;
+		pfx = "k";
+	} else if (v >= 1) {
+		pfx = " ";
+	} else if (v >= 1e-3) {
+		v *= 1e3;
+		pfx = "m";
+	} else if (v >= 1e-6) {
+		v *= 1e6;
+		pfx = "u";
+	} else {
+		v *= 1e9;
+		pfx = "n";
+	}
+	if (v >= 10)
+		textf(x, y, TEXT_RGBA, "%3d%s%s", (int) (v+0.5), pfx, unit);
+	else
+		textf(x, y, TEXT_RGBA, "%3.1f%s%s", v, pfx, unit);
+}
+
+
+static void show_freq(double freq)
+{
+	si_text(FREQ_X, FREQ_Y, freq, "Sa/s");
+	si_text(INTERVAL_X, INTERVAL_Y, 1/freq, "s/Sa");
+}
+
+
 /* ----- Main event loop --------------------------------------------------- */
 
 
@@ -306,7 +351,7 @@ static int pos_step(int zoom)
 }
 
 
-void gui(const uint8_t *buf, int skip, int nibbles)
+void gui(const uint8_t *buf, int skip, int nibbles, double freq)
 {
 	SDL_Event event;
 	int pos = (skip+nibbles) >> 1;
@@ -322,6 +367,7 @@ void gui(const uint8_t *buf, int skip, int nibbles)
 		for (i = 0; i != 4; i++)
 			textf(0, ch_y(i, 1), LABEL_RGBA, "CH%d", i);
 		show_buffer(buf, skip, nibbles, CH_XOFF, XRES, zoom, pos);
+		show_freq(freq);
 		update();
 
 		while (1) {
diff --git a/ubb-la/gui.h b/ubb-la/gui.h
index f3b552a..af977e0 100644
--- a/ubb-la/gui.h
+++ b/ubb-la/gui.h
@@ -18,6 +18,6 @@
 
 
 void gui_init(void);
-void gui(const uint8_t *buf, int skip, int nibbles);
+void gui(const uint8_t *buf, int skip, int nibbles, double freq);
 
 #endif /* !GUI_H */
diff --git a/ubb-la/try.c b/ubb-la/try.c
index dca868e..131a192 100644
--- a/ubb-la/try.c
+++ b/ubb-la/try.c
@@ -1,9 +1,10 @@
 #include <stdint.h>
+#include <stdlib.h>
 
 #include "gui.h"
 
 
-int main(void)
+int main(int argc, char **argv)
 {
 	static uint8_t buf[4000];
 	int i;
@@ -11,6 +12,6 @@ int main(void)
 	for (i = 0; i != 8000; i++)
 		buf[i >> 1] |= (i & 0xf) << 4*(~i & 1);
 	gui_init();
-	gui(buf, 0, 8000);
+	gui(buf, 0, 8000, argv[1] ? atof(argv[1]) : 1e6);
 	return 0;
 }
diff --git a/ubb-la/ubb-la.c b/ubb-la/ubb-la.c
index 286a787..6090f29 100644
--- a/ubb-la/ubb-la.c
+++ b/ubb-la/ubb-la.c
@@ -268,7 +268,8 @@ static void print_samples(FILE *file, uint8_t *buf, int skip, int nibbles)
 /* ----- Capture ----------------------------------------------------------- */
 
 
-static int do_buf(int nibbles, uint32_t trigger, uint32_t mask, int use_gui)
+static int do_buf(int nibbles, uint32_t trigger, uint32_t mask,
+    const struct mmcclk *clk, int use_gui)
 {
 	uint8_t *buf = physmem_malloc(4096);
 	struct physmem_vec vec;
@@ -291,7 +292,7 @@ static int do_buf(int nibbles, uint32_t trigger, uint32_t mask, int use_gui)
 		return 0;
 
 	if (use_gui)
-		gui(buf, INITIAL_SKIP, nibbles);
+		gui(buf, INITIAL_SKIP, nibbles, clk->bus_clk_hz);
 	else
 		print_samples(stdout, buf, INITIAL_SKIP, nibbles);
 
@@ -459,7 +460,7 @@ int main(int argc, char **argv)
 		gui_init();
 
 	if (!multi) {
-		res = !do_buf(8128, trigger, mask, use_gui);
+		res = !do_buf(8128, trigger, mask, &clk, use_gui);
 	} else {
 		frequency(&fast_clk, 84e6, 1);
 		do_bufs(multi, 8128, &clk, &fast_clk);