/* analog input method */
#define SINGLE_END 0x00
#define DIFFERENTIAL 0x08

/* channel mode */
#define MULTI 0x04
#define SINGLE 0x00

/* clock mode */
#define EXTERNAL_CLOCK 0x02
#define INTERNAL_CLOCK 0x00

/* stop mode */
#define SOFTWARE_COMMAND 0x00
#define CLOCK 0x01

#define BUF_CLR   0x05
#define DRE       0x02

#define MULTI_CHANNEL_MODE

//#define CH 0 /* channel # for convert (single channel mode)
//                maximum chanel # for convert (multi channel mode)
//	     */
#define CH 2 /* channel # for convert (single channel mode)
                maximum chanel # for convert (multi channel mode)
	     */
#define V_MAX 5.
#define V_MIN -5.
//#define V_MAX 2.
//#define V_MIN -2.
#define V_OFFSET ((V_MAX+V_MIN)/2.)

#define SAMPLING_CLOCK 10000 /* nsec */
		
#define ADC_BASE_ADDR 0xdf80
#define DAC_BASE_ADDR 0xdf40

int init_adc(void);
void cleanup_adc(void);
int init_dac(void);
void cleanup_dac(void);
int ad_conv(double *);
int ad_conv_raw(int *);
int da_conv(double, unsigned char);
int da_conv_pic(double, unsigned char);