Co je spatne?

[Bolek]

No, uz to tak bude. Mate pravdu. Dik za pomoc.

Jan Matejka wrote:

> A neni to tak, ze se nikdy nestane ze by 256 cyklu cteni AD davalo
> stejny vysledek, krome nejakeho patologickeho stavu (preteceni) 0x3FF,
> ktery jako jediny zobrazite? Ze by Vam to fungovalo spravne tak jste to
> napsal? Zkuste zmensit vyzadovany pocet mereni, treba na 1 nebo 2.
> 
> Jan Matejka
> 
> 
>>-----Original Message-----
>>From: hw-list-bounces@mailman.nethouse.cz 
>>[mailto:hw-list-bounces@mailman.nethouse.cz] On Behalf Of Bolek
>>Sent: Friday, October 01, 2004 6:38 PM
>>To: [HWnews]
>>Subject: Re: Co je spatne?
>>
>>
>>Je to cast funkce, ktera cela vypada ted takhle:
>>
>>uint8_t ReadColumn( uint8_t column)
>>// Reads one column, return index of the key pressed
>>// Returns 0xFF if the reading is not stable or no key is pressed {
>>   // How many reading must be the same before
>>   // the value is accepted. It is used to get rid
>>   // of transitional effect when the key is pressed
>>   uint16_t i, value, prevval;
>>
>>   ADMUX = column+4;
>>
>>   // Get first reading
>>   ADCSRA = admask | adsc;
>>   while (ADCSRA & adsc) ;
>>   ADCSRA = ADCSRA | adif;
>>
>>   prevval = ADCW >> 2;
>>   // Loop
>>   for (i=1; i<256; i++) {
>>       // Start conversion, loop until it is done
>>       ADCSRA = admask | adsc;
>>       while (ADCSRA & adsc) ;
>>       ADCSRA = ADCSRA | adif;
>>       // Read value
>>       value = ADCW >> 2;
>>
>>       if (prevval!=value) return 0xFF;
>>       prevval = value;
>>   }
>>
>>   char buffer[10];
>>   sprintf( buffer, "%x%x", ADMUX, value);
>>   DisplayText( buffer);
>>
>>   if (value>0xE0) return 0xFF;  // No key is pressed, pin is 
>>pulled up 
>>to AUCC
>>   else if (value>0xA0) return 0;
>>   else if (value>0x60) return 1;
>>   else if (value>0x20) return 2;
>>   else return 3;
>>}
>>
>>Ivo Neubauer wrote:
>>
>>
>>>to je jak cast nejake funkce, nebo naky vykousnuti z main ?????
>>>
>>>
>>>
>>
>>----------------------------------------------------------------------
>>
>>>--
>>>
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>>
>>-- 
>>====================================================
>>Ing. Boleslav Vrany
>>
>>Consulting and development in software, electronics,
>>modern optics and mechanical engineering.
>>
>>e-mail: see my web page or use the form there http://www.bolekvrany.cz
>>ICQ: 287 834 668
>>tel: (+420) 732 673 905
>>
>>
>>
> 
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
====================================================
Ing. Boleslav Vrany

Consulting and development in software, electronics,
modern optics and mechanical engineering.

e-mail: see my web page or use the form there
http://www.bolekvrany.cz
ICQ: 287 834 668
tel: (+420) 732 673 905