ad_cnf.h

AVR系列单片机的ADC驱动程序库

/*******************************************************************
*                            ADC                                   *
*                                                                  *
*                  by J.Schwedes 2009                              *
********************************************************************/


#ifndef AD_CNF_H
#define AD_CNF_H

/* AD converter options */
/* NOTE: not all features are supported by different Atmel devices */

/* Atoscan mode */
#define AD_USE_AUTOSCAN

/* AD injection */
// #define AD_USE_INJECTION coming soon

/* ADC clock presacaler */
/* define prescaler < 200kHz for 10-bit resolution */
#define AD_PRE_2   1
#define AD_PRE_4   2
#define AD_PRE_8   3
#define AD_PRE_16  4
/* only for some Megas */
#define AD_PRE_32  5
#define AD_PRE_64  6
#define AD_PRE_128 7

#define AD_CLOCK_PRESCALER AD_PRE_64 /* at CPU clock 8Mhz, AD clock is 125kHz */

/* define AD resolution */
#define AD_10BIT 0
#define AD_8BIT  1

#define AD_RESOLUTION AD_10BIT

#define AD_AREF_EXTERN_MEGA        0       /* only for Mega8/16/48/88/168 */
#define AD_AREF_VCC                0       /* only for Tiny25/45/85       */
#define AD_AREF_AVCC               1       /* only for Mega8/16/48/88/168 */
#define AD_AREF_EXTERN_TINY        1       /* only for Tiny25/45/85       */
#define AD_AREF_INTERNAL_1V1_TINY  2       /* only for Tiny25/45/85       */
#define AD_AREF_INTERNAL_1V1_MEGA  3       /* only for Mega48/88/168      */
#define AD_AREF_INTERNAL_2V56      3       /* only for Mega8/16 Tiny25/45/85  */

#define AD_VOLTAGE_REF AD_AREF_INTERNAL_2V56

/* define AD buffer size and indexes */

#define AD_BUFF_SIZE   8

#define AD_BUFF_IDX_0  0
#define AD_BUFF_IDX_1  1
#define AD_BUFF_IDX_2  2
#define AD_BUFF_IDX_3  3
#define AD_BUFF_IDX_4  4
#define AD_BUFF_IDX_5  5
#define AD_BUFF_IDX_6  6
#define AD_BUFF_IDX_7  7


/* IO definitions */

#define ADC_RESULT_8BIT   (u8)(ADC>>8)
#define ADC_RESULT_10BIT  ADC

#ifdef __ATmega8__
#define ADCSRA ADCSR /* make IAR defintion compatible to ATmega8 */
#endif


/* compiler options */

#define __AD_ROM __flash /* constants are accessed  in flash memory */

/* interface function called from OS preemptive task service */
extern void AD_AutoScan_OS_1ms(void);
#endif