GADC implementation with demo program

Also includes driver for AT91SAM7 cpu

1 files changed, 176 insertions, 0 deletions

diff --git a/demos/modules/gadc/main.c b/demos/modules/gadc/main.c
new file mode 100644
index 00000000..07802521
--- /dev/null
+++ b/demos/modules/gadc/main.c
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+/*
+    ChibiOS/GFX - Copyright (C) 2012, 2013
+                 Joel Bodenmann aka Tectu <joel@unormal.org>
+
+    This file is part of ChibiOS/GFX.
+
+    ChibiOS/GFX 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 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/GFX 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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * This demo demonstrates the use of the GADC module using it read both a microphone,
+ * an analogue dial wheel and a temperature sensor.
+ * The microphone gets read at high frequency to display a very simple oscilloscope.
+ * The dial and temperature gets read at a low frequency to just print when
+ * it changes value.
+ *
+ * It also demonstrates how to write your own custom GWIN window type.
+ */
+#include "ch.h"
+#include "hal.h"
+#include "chprintf.h"
+
+#include "gfx.h"
+
+/* Include our custom gwin oscilloscope */
+#include "gwinosc.h"
+
+/*
+ * Match these to your hardware
+ * If you don't have a DIAL device or a TEMP device - just don't define it.
+ */
+#define MY_MIC_DEVICE		GADC_PHYSDEV_MICROPHONE
+#define MY_DIAL_DEVICE		GADC_PHYSDEV_DIAL
+#define MY_TEMP_DEVICE		GADC_PHYSDEV_TEMPERATURE
+#define MY_DIAL_JITTER		1
+#define MY_TEMP_JITTER		3
+
+/* Specify our timing parameters */
+#define	MY_MIC_FREQUENCY	4000			/* 4khz */
+#define MY_LS_DELAY			200				/* 200ms (5 times per second) for the dial and temperature */
+
+/* The desired size for our scope window */
+#define SCOPE_CX			64
+#define SCOPE_CY			64
+
+/* Data */
+static GScopeObject			gScopeWindow;
+static GConsoleObject		gTextWindow;
+static GTimer				lsTimer;
+
+#ifdef MY_DIAL_DEVICE
+	static adcsample_t			dialvalue;
+	static adcsample_t			lastdial = -(MY_DIAL_JITTER+1);
+
+	/**
+	 * We have got a dial reading - handle it
+	 */
+	static void GotDialReading(adcsample_t *buffer, void *param) {
+		(void) buffer;
+
+		/* Buffer should always point to "dialvalue" anyway */
+
+		/* Remove jitter from the value */
+		if ((dialvalue > lastdial && dialvalue - lastdial > MY_DIAL_JITTER)
+				|| (lastdial > dialvalue && lastdial - dialvalue > MY_DIAL_JITTER)) {
+
+			/* Write the value */
+			chprintf((BaseSequentialStream *)param, "DIAL: %u\n", dialvalue);
+
+			/* Save for next time */
+			lastdial = dialvalue;
+		}
+	}
+#endif
+
+#ifdef MY_TEMP_DEVICE
+	static adcsample_t			tempvalue;
+	static adcsample_t			lasttemp = -(MY_TEMP_JITTER+1);
+
+	/**
+	 * We have got a temperature reading - handle it
+	 */
+	static void GotTempReading(adcsample_t *buffer, void *param) {
+		(void) buffer;
+
+		/* Buffer should always point to "tempvalue" anyway */
+
+		/* Remove jitter from the value */
+		if ((tempvalue > lasttemp && tempvalue - lasttemp > MY_TEMP_JITTER)
+				|| (lasttemp > tempvalue && lasttemp - tempvalue > MY_TEMP_JITTER)) {
+
+			/* Write the value */
+			chprintf((BaseSequentialStream *)param, "TEMP: %u\n", tempvalue);
+
+			/* Save for next time */
+			lasttemp = tempvalue;
+		}
+	}
+#endif
+
+#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
+	/**
+	 * Start a read of the dial and temperature
+	 */
+	static void LowSpeedTimer(void *param) {
+		/* We are not checking for an error here - but who cares, this is just a demo */
+		#ifdef MY_DIAL_DEVICE
+			gadcLowSpeedStart(MY_DIAL_DEVICE, &dialvalue, GotDialReading, param);
+		#endif
+		#ifdef MY_TEMP_DEVICE
+			gadcLowSpeedStart(MY_TEMP_DEVICE, &tempvalue, GotTempReading, param);
+		#endif
+	}
+#endif
+
+/*
+ * Application entry point.
+ */
+int main(void) {
+	GHandle					ghScope;
+	coord_t					swidth, sheight;
+	#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
+		GHandle					ghText;
+		BaseSequentialStream	*gsText;
+		font_t					font;
+	#endif
+
+	halInit();
+	chSysInit();
+	gdispInit();
+	gdispClear(Black);
+
+	/* Get the screen dimensions */
+	swidth = gdispGetWidth();
+	sheight = gdispGetHeight();
+
+	#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
+		/* Set up the console window we use for dial readings */
+		font = gdispOpenFont("UI2");
+		ghText = gwinCreateConsole(&gTextWindow, 0, 0, swidth-SCOPE_CX, sheight, font);
+		gwinSetBgColor(ghText, Black);
+		gwinSetColor(ghText, Yellow);
+		gwinClear(ghText);
+		gsText = gwinGetConsoleStream(ghText);
+
+		/* Start our timer for reading the dial */
+		gtimerInit(&lsTimer);
+		gtimerStart(&lsTimer, LowSpeedTimer, gsText, TRUE, MY_LS_DELAY);
+	#endif
+
+	/* Set up the scope window in the top right on the screen */
+	ghScope = gwinCreateScope(&gScopeWindow, swidth-SCOPE_CX, 0, SCOPE_CX, SCOPE_CY, MY_MIC_DEVICE, MY_MIC_FREQUENCY);
+	gwinSetBgColor(ghScope, White);
+	gwinSetColor(ghScope, Red);
+	gwinClear(ghScope);
+
+	/* Just keep displaying the scope traces */
+	while (TRUE) {
+		/**
+		 * The function below internally performs a wait thus giving the timer thread a
+		 * chance to run.
+		 */
+		gwinWaitForScopeTrace(ghScope);
+	}
+}