Diff: ADC/DMA/adc_dma_test.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADC/DMA/adc_dma_test.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,272 @@
+/***********************************************************************//**
+ * @file		adc_dma_test.c
+ * @purpose		This example describes how to use ADC conversions and
+ * 			  	transfer converted data by using DMA.
+ * @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_adc.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "lpc17xx_nvic.h"
+#include "lpc17xx_gpdma.h"
+#include "debug_frmwrk.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup ADC_DMA	DMA
+ * @ingroup ADC_Examples
+ * @{
+ */
+/************************** PRIVATE DEFINITIONS *************************/
+#define MCB_LPC_1768
+//#define IAR_LPC_1768
+
+#ifdef MCB_LPC_1768
+#define _ADC_INT		ADC_ADINTEN2
+#define _ADC_CHANNEL	ADC_CHANNEL_2
+#elif defined(IAR_LPC_1768)
+#define _ADC_INT		ADC_ADINTEN5
+#define _ADC_CHANNEL	ADC_CHANNEL_5
+#endif
+
+/** DMA size of transfer */
+#define DMA_SIZE		1
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t  menu1[] =
+		"********************************************************************************\n\r"
+		"Hello NXP Semiconductors \n\r"
+		" ADC demo \n\r"
+		"\t - MCU: LPC17xx \n\r"
+		"\t - Core: ARM CORTEX-M3 \n\r"
+		"\t - Communicate via: UART0 - 115200bps \n\r"
+		" DMA testing : ADC peripheral to memory\n\r"
+		" Use ADC with 12-bit resolution rate of 200KHz\n\r"
+		" Value ADC channel is displayed by UART, this value is taken from destination memory value of DMA function \n\r"
+		" Turn the potentiometer to see how ADC value changes\n\r"
+		"********************************************************************************\n\r";
+#ifdef MCB_LPC_1768
+uint8_t menu2[] = "ADC value on channel 2: ";
+#elif defined(IAR_LPC_1768)
+uint8_t menu2[] = "ADC value on channel 5: ";
+#endif
+
+/* Terminal Counter flag for Channel 0 */
+__IO uint32_t Channel0_TC;
+
+/* Error Counter flag for Channel 0 */
+__IO uint32_t Channel0_Err;
+
+/************************** PRIVATE FUNCTION *************************/
+void DMA_IRQHandler (void);
+
+void print_menu(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)){
+			// Clear terminate counter Interrupt pending
+			GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0);
+				Channel0_TC++;
+		}
+		// Check error terminal status
+		if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)){
+			// Clear error counter Interrupt pending
+			GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0);
+			Channel0_Err++;
+		}
+	}
+}
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		Print menu
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG(menu1);
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main ADC program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	PINSEL_CFG_Type PinCfg;
+	GPDMA_Channel_CFG_Type GPDMACfg;
+	uint32_t adc_value, tmp;
+
+	/* Initialize ADC ----------------------------------------------------*/
+
+	/* Because the potentiometer on different boards (MCB & IAR) connect
+	 * with different ADC channel, so we have to configure correct ADC channel
+	 * on each board respectively.
+	 * If you want to check other ADC channels, you have to wire this ADC pin directly
+	 * to potentiometer pin (please see schematic doc for more reference)
+	 */
+#ifdef MCB_LPC_1768
+	/* If using MCB1700 v.1 board
+	 * select P0.25 as AD0.2
+	 */
+	PinCfg.Funcnum = 1;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Pinnum = 25;
+	PinCfg.Portnum = 0;
+	PINSEL_ConfigPin(&PinCfg);
+#elif defined(IAR_LPC_1768)
+	/* If using IAR LPC1768 KS v.A board:
+	 * select P1.31 as AD0.5
+	 */
+	PinCfg.Funcnum = 3;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Pinnum = 31;
+	PinCfg.Portnum = 1;
+	PINSEL_ConfigPin(&PinCfg);
+#endif
+
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+
+	// print welcome screen
+	print_menu();
+
+	/*  Configuration for ADC :
+	 *  Select: ADC channel 2 (if using MCB1700 board)
+	 *  	    ADC channel 5 (if using IAR-LPC1768 board)
+	 * 	ADC conversion rate = 200KHz
+	 */
+	ADC_Init(LPC_ADC, 200000);
+	ADC_IntConfig(LPC_ADC,_ADC_INT,SET);
+	ADC_ChannelCmd(LPC_ADC,_ADC_CHANNEL,SET);
+
+	/* GPDMA block section -------------------------------------------- */
+	/* Disable GPDMA interrupt */
+	NVIC_DisableIRQ(DMA_IRQn);
+	/* preemption = 1, sub-priority = 1 */
+	NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01));
+
+	/* Initialize GPDMA controller */
+	GPDMA_Init();
+
+	// Setup GPDMA channel --------------------------------
+	// channel 0
+	GPDMACfg.ChannelNum = 0;
+	// Source memory - unused
+	GPDMACfg.SrcMemAddr = 0;
+	// Destination memory
+	GPDMACfg.DstMemAddr = (uint32_t) &adc_value;
+	// Transfer size
+	GPDMACfg.TransferSize = DMA_SIZE;
+	// Transfer width - unused
+	GPDMACfg.TransferWidth = 0;
+	// Transfer type
+	GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_P2M;
+	// Source connection
+	GPDMACfg.SrcConn = GPDMA_CONN_ADC;
+	// Destination connection - unused
+	GPDMACfg.DstConn = 0;
+	// Linker List Item - unused
+	GPDMACfg.DMALLI = 0;
+	GPDMA_Setup(&GPDMACfg);
+
+	/* Reset terminal counter */
+	Channel0_TC = 0;
+	/* Reset Error counter */
+	Channel0_Err = 0;
+
+	/* Enable GPDMA interrupt */
+	NVIC_EnableIRQ(DMA_IRQn);
+
+	while (1) {
+
+		// Enable GPDMA channel 0
+		GPDMA_ChannelCmd(0, ENABLE);
+
+		ADC_StartCmd(LPC_ADC,ADC_START_NOW);
+		/* Wait for GPDMA processing complete */;
+		while ((Channel0_TC == 0) );
+
+		// Disable GPDMA channel 0
+		GPDMA_ChannelCmd(0, DISABLE);
+
+		//Display the result of conversion on the UART0
+		_DBG(menu2);
+		_DBD32(ADC_DR_RESULT(adc_value));
+		_DBG_("");
+
+		// Wait for a while
+		for(tmp = 0; tmp < 1000000; tmp++);
+
+		/* GPDMA Re-setup */
+		GPDMA_Setup(&GPDMACfg);
+
+		/* Reset terminal counter */
+		Channel0_TC = 0;
+		/* Reset Error counter */
+		Channel0_Err = 0;
+	}
+	ADC_DeInit(LPC_ADC);
+	return 1;
+}
+
+/* Support required entry point for other toolchain */
+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
+
+/*
+ * @}
+ */