Frank 26080115 / LPC1700CMSIS_Examples

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

DAC/SineWave/dac_sinewave_test.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_sinewave_test.c





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 * @purpose		This example describes how to use DAC to generate a sine wave





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 * 			  	using DMA to transfer data





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 * @version		2.0





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 * @date		04. June. 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_SineWave	SineWave





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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		60





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#define NUM_SINE_SAMPLE	60





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#define SINE_FREQ_IN_HZ	60





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#define PCLK_DAC_IN_MHZ	25 //CCLK divided by 4





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





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GPDMA_Channel_CFG_Type GPDMACfg;





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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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	GPDMA_LLI_Type DMA_LLI_Struct;





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	uint32_t tmp;





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	uint32_t i;





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	uint32_t sin_0_to_90_16_samples[16]={\





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			0,1045,2079,3090,4067,\





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			5000,5877,6691,7431,8090,\





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			8660,9135,9510,9781,9945,10000\





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	};





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	uint32_t dac_sine_lut[NUM_SINE_SAMPLE];





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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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	//Prepare DAC sine look up table





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





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	{





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		if(i<=15)





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		{





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			dac_sine_lut[i] = 512 + 512*sin_0_to_90_16_samples[i]/10000;





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			if(i==15) dac_sine_lut[i]= 1023;





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		}





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		else if(i<=30)





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		{





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			dac_sine_lut[i] = 512 + 512*sin_0_to_90_16_samples[30-i]/10000;





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		}





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		else if(i<=45)





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		{





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			dac_sine_lut[i] = 512 - 512*sin_0_to_90_16_samples[i-30]/10000;





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		}





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		else





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		{





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			dac_sine_lut[i] = 512 - 512*sin_0_to_90_16_samples[60-i]/10000;





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		}





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		dac_sine_lut[i] = (dac_sine_lut[i]<<6);





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	}





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	//Prepare DMA link list item structure





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	DMA_LLI_Struct.SrcAddr= (uint32_t)dac_sine_lut;





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	DMA_LLI_Struct.DstAddr= (uint32_t)&(LPC_DAC->DACR);





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	DMA_LLI_Struct.NextLLI= (uint32_t)&DMA_LLI_Struct;





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	DMA_LLI_Struct.Control= DMA_SIZE





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							| (2<<18) //source width 32 bit





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							| (2<<21) //dest. width 32 bit





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							| (1<<26) //source increment





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							;





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





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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_sine_lut);





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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 = (uint32_t)&DMA_LLI_Struct;





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	// Setup channel with given parameter





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	GPDMA_Setup(&GPDMACfg);





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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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	tmp = (PCLK_DAC_IN_MHZ*1000000)/(SINE_FREQ_IN_HZ*NUM_SINE_SAMPLE);





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	DAC_SetDMATimeOut(LPC_DAC,tmp);





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	DAC_ConfigDAConverterControl(LPC_DAC, &DAC_ConverterConfigStruct);





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	// Enable GPDMA channel 0





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	GPDMA_ChannelCmd(0, ENABLE);





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	while (1);





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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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 */