/* 2013/11/26 By M.kikuchi
   ATTiny13A 1.2MHz     PWM LOG_type VR
   PB0 �D OC0A          PB2 �F input 1=LOGtype 0=Normal
   PB1 �E OC0B UN USE   PB3 �A
   PB4 �B ADC2 ADC in   Config H=1F  L=6A
   ROM    256 bytes     Last   11/26
*/

char LOG_addata[]={
     0,1,1,2,2,3,4,5,7,9,
     11,13,16,20,25,32,40,50,62,75,
     96,119,148,183,228,255
};

char ADCR (char ACH){             // 8bit out
     ADMUX  |= ACH;               // set of ch
     ADCSRA.ADIF=0;               // Flag clear
     ADCSRA.ADSC=1;               // start
     while (ADCSRA.ADIF==0);
     return ADCH;
}

void main() {
     char temp;
//
     DDRB =0b00000011;             // Set OC0A,OC0B
     PORTB=0b00000100;             // Pull UP for SW
     DIDR0=0b00011000;             // �BPB4=ADC2D �APB3=ADC3D Digital disable
     TCCR0A=0b10000001;            // 非反転　8bit位相
//    TCCR0A=0b10000011;            // 高速 (2倍速の時 約600Hz)
     TCCR0B=0b00000010;            // 1/8  293Hz 3.4mSec:1/1-0.42mSec
     OCR0A =0x63;                  // 比較register 39%
     ADCSRA.ADEN=1;                // ADC Power ON
     ADCSRA |=0b00000011;          // 1/8 cloak
     ADMUX   =0b00100000;          // Vcc:use ADCH: PB4=10
 //
    while (1){
       temp = ADCR(2);             // ADC to PWM
       if (PINB2_bit == 1){
           temp /= 10;
           OCR0A = LOG_addata[temp];
         }
       else
         OCR0A = temp;
       Delay_ms(50);
    };
}