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

boards/OLIMEX_LPC_P2148/board.mk

@@ -1,5 +1,6 @@
 # List of all the board related files.
-BOARDSRC = ${CHIBIOS}/boards/OLIMEX_LPC_P2148/board.c
+BOARDSRC = ${CHIBIOS}/boards/OLIMEX_LPC_P2148/board.c \
+           ${CHIBIOS}/boards/OLIMEX_LPC_P2148/buzzer.c
 
 # Required include directories
 BOARDINC = ${CHIBIOS}/boards/OLIMEX_LPC_P2148

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);
+}

boards/OLIMEX_LPC_P2148/buzzer.h

@@ -0,0 +1,35 @@
+/*
+    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/>.
+*/
+
+#ifndef _BUZZER_H_
+#define _BUZZER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void buzzInit(void);
+  void buzzPlay(uint32_t freq, systime_t duration);
+  void buzzPlayWait(uint32_t freq, systime_t duration);
+#ifdef __cplusplus
+}
+#endif
+
+extern EventSource BuzzerSilentEventSource;
+
+#endif /* _BUZZER_H_ */