ad7877.c

ADSP 与高速AD器件无缝链接的源代码

/*****************************************************************************
 * AD7877.c
 * Frank.liux    2008-12-17
 *****************************************************************************/
#include	"..\include\AD7877.h"
#include	"..\include\AD7877_Register.h"

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//					  Programmed AD7877
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void	AD7877_Init					(void)
{
									/* prepare AD7877;*/				
	/*conversion interval timer 8.194ms ;internal reference; Indicates polarity of signal on STOPACQ pin active high
	first conversion delay1.024 ms;ADC and reference powered up continuously;ADC acquisition time16 μs;
	4 measurements per channel averaged*/
	AD7877_Program		(AD7877_CONTROL_REG2,
						 AD7877_TMR_3+
						 AD7877_POL+

						 AD7877_PM_2+
						 AD7877_ACQ_3+
						 AD7877_AVG_1
						 

						 );		
	/*X+ and Y+  in convert Sequencer*/						 									
	AD7877_Program		(AD7877_SEQUENCER_REG1,
						 AD7877_XPOS_MS+
						 AD7877_YPOS_MS
						);
	/*refer to AD7877 datasheet Page 20 ,it's said that: Control register 1 should be  programmed at last. 
	 Master Mode ;the first read register start at X+ REG;Ratiometric Method */	
	AD7877_Program		(AD7877_CONTROL_REG1,
						 AD7877_MODE_3+
						 X
						 );		

}
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//							The Main Function
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	void	main	( void)
		{
//			Set_PLL		(22,5);	
			//Set_PLL(); would set the Core clock and system clock ,if you do not want to do so ,the defult value will be 
			//CCLK = 250Mhz SCLK = 50Mhz

			Initial_SPI0				();
			AD7877_Init					();
			Initial_AD7877_Interrupt	();

			while(1);
		}