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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-12-20 11:49:53 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-12-20 11:49:53 +0000 |
| commit | af494b355e7354e2cc3034a0465100876f9c136f (patch) | |
| tree | bd83f4fe99efd38bbcbe618db3b513647bffb39d /boards/OLIMEX_LPC_P2148/buzzer.c | |
| parent | 4e37e938e5c861d758168705e8d681d18d9a6243 (diff) | |
| download | ChibiOS-af494b355e7354e2cc3034a0465100876f9c136f.tar.gz ChibiOS-af494b355e7354e2cc3034a0465100876f9c136f.tar.bz2 ChibiOS-af494b355e7354e2cc3034a0465100876f9c136f.zip | |
Added the buzzer driver to the Olimex LPC-P2148 board generic support.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1446 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'boards/OLIMEX_LPC_P2148/buzzer.c')
| -rw-r--r-- | boards/OLIMEX_LPC_P2148/buzzer.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/boards/OLIMEX_LPC_P2148/buzzer.c b/boards/OLIMEX_LPC_P2148/buzzer.c new file mode 100644 index 000000000..d87a8ddb7 --- /dev/null +++ b/boards/OLIMEX_LPC_P2148/buzzer.c @@ -0,0 +1,112 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT 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/RT 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/>.
+*/
+
+/*
+ * Buzzer driver for Olimex LPC-P2148.
+ * Uses the timer 1 for wave generation and a Virtual Timer for the sound
+ * duration.
+ * The driver also generates an event when the sound is done and the buzzer
+ * goes silent.
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#include "buzzer.h"
+
+EventSource BuzzerSilentEventSource;
+
+#define StartCounter(t) ((t)->TC_EMR = 0xF1, (t)->TC_TCR = 1)
+#define StopCounter(t) ((t)->TC_EMR = 0, (t)->TC_TCR = 2)
+
+/**
+ * @brief Buzzer driver initialization. + */
+void buzzInit(void) {
+
+ chEvtInit(&BuzzerSilentEventSource);
+
+ /*
+ * Switches P0.12 and P0.13 to MAT1.0 and MAT1.1 functions.
+ * Enables Timer1 clock.
+ */
+ PINSEL0 &= 0xF0FFFFFF;
+ PINSEL0 |= 0x0A000000;
+ PCONP = (PCONP & PCALL) | PCTIM1;
+
+ /*
+ * Timer setup.
+ */
+ TC *tc = T1Base;
+ StopCounter(tc);
+ tc->TC_CTCR = 0; /* Clock source is PCLK. */
+ tc->TC_PR = 0; /* Prescaler disabled. */
+ tc->TC_MCR = 2; /* Clear TC on match MR0. */
+}
+
+/**
+ * @brief Stops the sound.
+ * + * @param[in] p pointer to the timer + */
+static void stop(void *p) {
+
+ StopCounter((TC *)p);
+ chEvtBroadcastI(&BuzzerSilentEventSource);
+}
+
+/**
+ * @brief Plays a tone asynchronously.
+ * + * @param[in] freq approximated tone frequency + * @param[in] duration tone duration in systicks + */
+void buzzPlay(uint32_t freq, systime_t duration) {
+ static VirtualTimer bvt;
+ TC *tc = T1Base;
+
+ chSysLock();
+
+ if (chVTIsArmedI(&bvt)) { /* If a sound is already being */
+ chVTResetI(&bvt); /* played then aborts it. */
+ StopCounter(tc);
+ }
+
+ tc->TC_MR0 = tc->TC_MR1 = (PCLK / (freq * 2));
+ StartCounter(tc);
+ chVTSetI(&bvt, duration, stop, tc);
+
+ chSysUnlock();
+}
+
+/**
+ * @brief Plays a tone.
+ *
+ * @param[in] freq approximated tone frequency
+ * @param[in] duration tone duration in systicks
+ */
+void buzzPlayWait(uint32_t freq, systime_t duration) {
+ TC *tc = T1Base;
+
+ StopCounter(tc);
+ tc->TC_MR0 = tc->TC_MR1 = (PCLK / (freq * 2));
+ StartCounter(tc);
+ chThdSleep(duration);
+ StopCounter(tc);
+}
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