Frank 26080115 / LPC1700CMSIS_Examples

These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!

DAC/DMA/dac_dma.c@0:bf7b9fba3924, 2011-03-20 (annotated)

Committer:
frank26080115
Date:
Sun Mar 20 05:38:56 2011 +0000
Revision:
0:bf7b9fba3924

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


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/***********************************************************************//**





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 * @file		dac_dma.c





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 * @purpose		This example describes how to use DAC conversion and





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 * 			  	using DMA to transfer data





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 * @version		2.0





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 * @date		21. May. 2010





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 * @author		NXP MCU SW Application Team





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 *---------------------------------------------------------------------





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 * Software that is described herein is for illustrative purposes only





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 * which provides customers with programming information regarding the





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 * products. This software is supplied "AS IS" without any warranties.





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 * NXP Semiconductors assumes no responsibility or liability for the





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 * use of the software, conveys no license or title under any patent,





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 * copyright, or mask work right to the product. NXP Semiconductors





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 * reserves the right to make changes in the software without





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 * notification. NXP Semiconductors also make no representation or





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 * warranty that such application will be suitable for the specified





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 * use without further testing or modification.





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 **********************************************************************/





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#include "lpc17xx_dac.h"





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#include "lpc17xx_libcfg.h"





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#include "lpc17xx_pinsel.h"





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#include "lpc17xx_gpdma.h"





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/* Example group ----------------------------------------------------------- */





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/** @defgroup DAC_DMA	DMA





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 * @ingroup DAC_Examples





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 * @{





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 */





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/************************** PRIVATE MACROS *************************/





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/** DMA size of transfer */





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#define DMA_SIZE		1





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/************************** PRIVATE VARIABLES *************************/





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// Terminal Counter flag for Channel 0





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__IO uint32_t Channel0_TC;





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// Error Counter flag for Channel 0





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__IO uint32_t Channel0_Err;





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GPDMA_Channel_CFG_Type GPDMACfg;





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/************************** PRIVATE FUNCTION *************************/





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void DMA_IRQHandler (void);





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/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/





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/*********************************************************************//**





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 * @brief		GPDMA interrupt handler sub-routine





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 * @param[in]	None





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 * @return 		None





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 **********************************************************************/





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void DMA_IRQHandler (void)





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{





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	// check GPDMA interrupt on channel 0





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	if (GPDMA_IntGetStatus(GPDMA_STAT_INT, 0)){





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		// Check counter terminal status





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		if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 0)){





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			GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0);





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			Channel0_TC++;





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		}





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		// Check error terminal status





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		if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)){





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			GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0);





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			Channel0_Err++;





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		}





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	}





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}





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/*-------------------------MAIN FUNCTION------------------------------*/





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/*********************************************************************//**





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 * @brief		c_entry: Main DAC program body





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 * @param[in]	None





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 * @return 		int





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 **********************************************************************/





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int c_entry(void)





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{





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	PINSEL_CFG_Type PinCfg;





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	DAC_CONVERTER_CFG_Type DAC_ConverterConfigStruct;





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	uint32_t dac_value =0;





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	uint32_t i;





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	/*





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	 * Init DAC pin connect





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	 * AOUT on P0.26





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	 */





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	PinCfg.Funcnum = 2;





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	PinCfg.OpenDrain = 0;





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	PinCfg.Pinmode = 0;





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	PinCfg.Pinnum = 26;





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	PinCfg.Portnum = 0;





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	PINSEL_ConfigPin(&PinCfg);





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	/* GPDMA block section -------------------------------------------- */





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	/* Disable GPDMA interrupt */





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	NVIC_DisableIRQ(DMA_IRQn);





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	/* preemption = 1, sub-priority = 1 */





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	NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01));





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	DAC_ConverterConfigStruct.CNT_ENA =SET;





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	DAC_ConverterConfigStruct.DMA_ENA = SET;





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	DAC_Init(LPC_DAC);





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	/* set time out for DAC*/





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	DAC_SetDMATimeOut(LPC_DAC,0xFFFF);





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	DAC_ConfigDAConverterControl(LPC_DAC, &DAC_ConverterConfigStruct);





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	/* Initialize GPDMA controller */





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	GPDMA_Init();





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	// Setup GPDMA channel --------------------------------





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	// channel 0





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	GPDMACfg.ChannelNum = 0;





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	// Source memory





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	GPDMACfg.SrcMemAddr = (uint32_t)(&dac_value);





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	// Destination memory - unused





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	GPDMACfg.DstMemAddr = 0;





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	// Transfer size





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	GPDMACfg.TransferSize = DMA_SIZE;





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	// Transfer width - unused





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	GPDMACfg.TransferWidth = 0;





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	// Transfer type





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	GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;





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	// Source connection - unused





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	GPDMACfg.SrcConn = 0;





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	// Destination connection





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	GPDMACfg.DstConn = GPDMA_CONN_DAC;





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	// Linker List Item - unused





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	GPDMACfg.DMALLI = 0;





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	// Setup channel with given parameter





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	GPDMA_Setup(&GPDMACfg);





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	/* Reset terminal counter */





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	Channel0_TC = 0;





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	/* Reset Error counter */





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	Channel0_Err = 0;





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	/* Enable GPDMA interrupt */





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	NVIC_EnableIRQ(DMA_IRQn);





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	/* Wait for GPDMA processing complete */





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	while (1) {





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		// Enable GPDMA channel 0





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		GPDMA_ChannelCmd(0, ENABLE);





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		while ((Channel0_TC == 0) );





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		// Disable GPDMA channel 0





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		GPDMA_ChannelCmd(0, DISABLE);





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		dac_value ++;





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		if (dac_value == 0x3FF) dac_value =0;





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		//delay





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		for(i=0;i<100000;i++);





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		/* Reset terminal counter */





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		Channel0_TC = 0;





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		// Re-setup channel





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		GPDMA_Setup(&GPDMACfg);





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	}





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	return 1;





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}





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/* With ARM and GHS toolsets, the entry point is main() - this will





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   allow the linker to generate wrapper code to setup stacks, allocate





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   heap area, and initialize and copy code and data segments. For GNU





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   toolsets, the entry point is through __start() in the crt0_gnu.asm





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   file, and that startup code will setup stacks and data */





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int main(void)





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{





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    return c_entry();





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}





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#ifdef  DEBUG





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/*******************************************************************************





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* @brief		Reports the name of the source file and the source line number





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* 				where the CHECK_PARAM error has occurred.





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* @param[in]	file Pointer to the source file name





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* @param[in]    line assert_param error line source number





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* @return		None





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*******************************************************************************/





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void check_failed(uint8_t *file, uint32_t line)





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{





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	/* User can add his own implementation to report the file name and line number,





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	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */





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	/* Infinite loop */





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	while(1);





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}





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#endif





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/*





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 * @}





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 */