adutl.c

来自「瑞萨(Renesas)M16C系列芯片的函数库」· C语言 代码 · 共 39 行

#include "adutl.h"	// AD utility header file
#include "sfr62p.h"	// SFR definition of M16C/62P

/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void InitAD(void)
* Function     		: initialize AD
* Paramenter   		: none
* Return 	 		: none
* Function used		: none
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void InitAD(void)
{
	adcon2 = 0x01;                  /* set A-D control register 2       */
                                    /* 00000001                         */
                                    /* |||||||+---sample & hold		    */
                                    /* +++++++----not used              */

    adcon0 = 0x88;                  /* set A-D control register 0       */
                                    /* 10001000                         */
                                    /* |||||+++---AN0                   */
                                    /* |||++------repeat mode           */
                                    /* ||+--------0=S/W trigger         */
                                    /* |+---------0=AD conversion disabled,1=started   */
                                    /* +----------0=fad/4,1=fad/2       */

    adcon1 = 0x28;                  /* set A-D control register 1       */
                                    /* 00101000                         */
                                    /* ||||||++---invalid               */
                                    /* |||||+-----set to 0 when repeat mode is selected   */
                                    /* ||||+------0=8bit,1=10bit        */
                                    /* |||+-------0=fad/2or/4,1=fad     */
                                    /* ||+--------1=Vref connected      */
                                    /* ++---------not used            */
    adst = 1;                     /* AD conversion started                       */
                                    /*       (bit 6 of A-D control register 0)*/
}