Diff: sample_rate.c

Revision:

0:cb80470434eb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sample_rate.c	Tue Oct 28 12:19:42 2014 +0000
@@ -0,0 +1,72 @@
+/*
+ * @brief Sample rate related timer stuff.
+ *
+ * @note
+ * Copyright (C) Elektor, 2014
+ * All rights reserved.
+ *
+ * @par
+ * This software is supplied "AS IS" without any warranties of any kind,
+ * and Elektor and its licensor disclaim any and all warranties, express
+ * or implied, including all implied warranties of merchantability,
+ * fitness for a particular purpose and non-infringement of intellectual
+ * property rights.  Elektor assumes no responsibility or liability for
+ * the use of the software, conveys no license or rights under any patent,
+ * copyright, mask work right, or any other intellectual property rights in
+ * or to any products. Elektor reserves the right to make changes in the
+ * software without notification. Elektor also makes no representation or
+ * warranty that such application will be suitable for the specified use
+ * without further testing or modification.
+ *
+ * @par
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation is hereby granted, under Elektor's and its licensor's
+ * relevant copyrights in the software, without fee.  This copyright,
+ * permission, and disclaimer notice must appear in all copies of this code.
+ */
+
+#include "board.h"
+#include "sample_rate.h"
+
+/*
+#if SAMPLE_RATE_TIMER_NR == TIMER16_0
+void TIMER16_0_IRQHandler(void)
+#elif SAMPLE_RATE_TIMER_NR == TIMER16_1
+void TIMER16_1_IRQHandler(void)
+#elif SAMPLE_RATE_TIMER_NR == TIMER32_0
+void TIMER32_0_IRQHandler(void)
+#elif SAMPLE_RATE_TIMER_NR == TIMER32_1
+void TIMER32_1_IRQHandler(void)
+#else
+	// Does not exist.
+	#pragma GCC error "Selected SAMPLE_RATE timer does not exist."
+void SampleRate_DummyIRQHandler(void)
+#endif
+{
+	if (Chip_TIMER_MatchPending(SAMPLE_RATE_TIMER,SAMPLE_RATE_FREQUENCY_REGISTER))
+	{
+		Chip_TIMER_ClearMatch(SAMPLE_RATE_TIMER,SAMPLE_RATE_FREQUENCY_REGISTER);
+		Board_LED_Toggle(0);
+	}
+}
+
+
+void SampleRate_Init(uint32_t default_rate, uint32_t samples_per_period)
+{
+	// Setup pin multiplexer.
+	Chip_IOCON_PinMuxSet(LPC_IOCON,SAMPLE_RATE_IOCON,IOCON_DIGMODE_EN|IOCON_MODE_INACT|SAMPLE_RATE_IOCON_FUNC);
+	// Make the pin an output.
+	Chip_GPIO_WriteDirBit(LPC_GPIO_PORT,SAMPLE_RATE_MAT_PORT,SAMPLE_RATE_MAT_PIN,true);
+
+	Chip_TIMER_Init(SAMPLE_RATE_TIMER);
+	Chip_TIMER_Reset(SAMPLE_RATE_TIMER);
+	Chip_TIMER_MatchEnableInt(SAMPLE_RATE_TIMER,SAMPLE_RATE_FREQUENCY_REGISTER);
+	Chip_TIMER_SetMatch(SAMPLE_RATE_TIMER,SAMPLE_RATE_FREQUENCY_REGISTER,Chip_Clock_GetSystemClockRate()/(default_rate*samples_per_period));
+	Chip_TIMER_ResetOnMatchEnable(SAMPLE_RATE_TIMER,SAMPLE_RATE_FREQUENCY_REGISTER);
+	Chip_TIMER_Enable(SAMPLE_RATE_TIMER);
+
+	// Enable timer interrupt.
+	NVIC_ClearPendingIRQ(SAMPLE_RATE_TIMER_IRQ);
+	NVIC_EnableIRQ(SAMPLE_RATE_TIMER_IRQ);
+}
+*/