Diff: DAC/DMA/dac_dma.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC/DMA/dac_dma.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,198 @@
+/***********************************************************************//**
+ * @file		dac_dma.c
+ * @purpose		This example describes how to use DAC conversion and
+ * 			  	using DMA to transfer data
+ * @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 "lpc17xx_gpdma.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup DAC_DMA	DMA
+ * @ingroup DAC_Examples
+ * @{
+ */
+
+/************************** PRIVATE MACROS *************************/
+/** DMA size of transfer */
+#define DMA_SIZE		1
+
+/************************** PRIVATE VARIABLES *************************/
+// Terminal Counter flag for Channel 0
+__IO uint32_t Channel0_TC;
+
+// Error Counter flag for Channel 0
+__IO uint32_t Channel0_Err;
+
+GPDMA_Channel_CFG_Type GPDMACfg;
+
+/************************** PRIVATE FUNCTION *************************/
+void DMA_IRQHandler (void);
+
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief		GPDMA interrupt handler sub-routine
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void DMA_IRQHandler (void)
+{
+	// check GPDMA interrupt on channel 0
+	if (GPDMA_IntGetStatus(GPDMA_STAT_INT, 0)){
+		// Check counter terminal status
+		if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 0)){
+			GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0);
+			Channel0_TC++;
+		}
+		// Check error terminal status
+		if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)){
+			GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0);
+			Channel0_Err++;
+		}
+	}
+}
+
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main DAC program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	PINSEL_CFG_Type PinCfg;
+	DAC_CONVERTER_CFG_Type DAC_ConverterConfigStruct;
+	uint32_t dac_value =0;
+	uint32_t i;
+	/*
+	 * 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);
+
+	/* GPDMA block section -------------------------------------------- */
+
+	/* Disable GPDMA interrupt */
+	NVIC_DisableIRQ(DMA_IRQn);
+
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01));
+
+	DAC_ConverterConfigStruct.CNT_ENA =SET;
+	DAC_ConverterConfigStruct.DMA_ENA = SET;
+	DAC_Init(LPC_DAC);
+	/* set time out for DAC*/
+	DAC_SetDMATimeOut(LPC_DAC,0xFFFF);
+	DAC_ConfigDAConverterControl(LPC_DAC, &DAC_ConverterConfigStruct);
+
+	/* Initialize GPDMA controller */
+	GPDMA_Init();
+
+	// Setup GPDMA channel --------------------------------
+	// channel 0
+	GPDMACfg.ChannelNum = 0;
+	// Source memory
+	GPDMACfg.SrcMemAddr = (uint32_t)(&dac_value);
+	// Destination memory - unused
+	GPDMACfg.DstMemAddr = 0;
+	// Transfer size
+	GPDMACfg.TransferSize = DMA_SIZE;
+	// Transfer width - unused
+	GPDMACfg.TransferWidth = 0;
+	// Transfer type
+	GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
+	// Source connection - unused
+	GPDMACfg.SrcConn = 0;
+	// Destination connection
+	GPDMACfg.DstConn = GPDMA_CONN_DAC;
+	// Linker List Item - unused
+	GPDMACfg.DMALLI = 0;
+	// Setup channel with given parameter
+	GPDMA_Setup(&GPDMACfg);
+
+	/* Reset terminal counter */
+	Channel0_TC = 0;
+	/* Reset Error counter */
+	Channel0_Err = 0;
+
+	/* Enable GPDMA interrupt */
+	NVIC_EnableIRQ(DMA_IRQn);
+
+	/* Wait for GPDMA processing complete */
+	while (1) {
+
+		// Enable GPDMA channel 0
+		GPDMA_ChannelCmd(0, ENABLE);
+
+		while ((Channel0_TC == 0) );
+
+		// Disable GPDMA channel 0
+		GPDMA_ChannelCmd(0, DISABLE);
+
+		dac_value ++;
+		if (dac_value == 0x3FF) dac_value =0;
+		//delay
+		for(i=0;i<100000;i++);
+
+		/* Reset terminal counter */
+		Channel0_TC = 0;
+
+		// Re-setup channel
+		GPDMA_Setup(&GPDMACfg);
+	}
+
+	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
+
+/*
+ * @}
+ */