Diff: DAC/Speaker/dac_speaker.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC/Speaker/dac_speaker.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,107 @@
+/***********************************************************************//**
+ * @file		dac_speaker.c
+ * @purpose		This example used to test DAC peripheral through speaker
+ * @version		2.0
+ * @date		21. May. 2010
+ * @author		NXP MCU SW Application Team
+ *---------------------------------------------------------------------
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ **********************************************************************/
+#include "lpc17xx_dac.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "debug_frmwrk.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup DAC_Speaker	Speaker
+ * @ingroup DAC_Examples
+ * @{
+ */
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main DAC program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	PINSEL_CFG_Type PinCfg;
+	uint32_t time;
+	float rate =0;
+
+	/*
+	 * Init DAC pin connect
+	 * AOUT on P0.26
+	 */
+	PinCfg.Funcnum = 2;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Pinnum = 26;
+	PinCfg.Portnum = 0;
+	PINSEL_ConfigPin(&PinCfg);
+
+	/* init DAC structure to default
+	 * Maximum	current is 700 uA
+	 * First value to AOUT is 0
+	 */
+	DAC_Init(LPC_DAC);
+
+	// main loop
+	while (1)
+	{
+		for(time = 1; time < 0x3FF; time++)
+		{
+			DAC_UpdateValue ( LPC_DAC,(uint32_t)(time*rate));
+		}
+
+		rate += 0.001;
+
+		if(rate >= 1)
+		{
+			rate = 0;
+		}
+	}
+
+	return 1;
+}
+/* With ARM and GHS toolsets, the entry point is main() - this will
+   allow the linker to generate wrapper code to setup stacks, allocate
+   heap area, and initialize and copy code and data segments. For GNU
+   toolsets, the entry point is through __start() in the crt0_gnu.asm
+   file, and that startup code will setup stacks and data */
+int main(void)
+{
+    return c_entry();
+}
+
+#ifdef  DEBUG
+/*******************************************************************************
+* @brief		Reports the name of the source file and the source line number
+* 				where the CHECK_PARAM error has occurred.
+* @param[in]	file Pointer to the source file name
+* @param[in]    line assert_param error line source number
+* @return		None
+*******************************************************************************/
+void check_failed(uint8_t *file, uint32_t line)
+{
+	/* User can add his own implementation to report the file name and line number,
+	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+	/* Infinite loop */
+	while(1);
+}
+#endif
+
+/*
+ * @}
+ */