[En-Nut-Discussion] Analog Input

[Daniel]

Andre Riesberg schrieb:
> Daniel wrote:
>
>   
>> Hi all,
>>
>> Sadly I have to bother you again with ADC issues. I am not able to get a 
>> signal on the ADC inputs. I've uploaded an image of the simple circuit 
>> I'm using: (http://www.darthziu.de/Bilder/Circuit.jpg).
>>
>> I bridged Pin 1&2 on the ADC connector as Harald wrote on 2009/09/02.
>>
>> Code is as follows (as the example at NutWiki):
>>
>> int main(void)
>> {
>>    // UART registrieren
>>    u_long baud = 115200;
>>    NutRegisterDevice(&DEV_UART, 0, 0);
>>    freopen(DEV_DEBUG_NAME, "w", stdout);
>>    _ioctl(_fileno(stdout), UART_SETSPEED, &baud);
>>
>>    puts("\nADC example");
>>
>>    ADCInit();
>>    uint16_t adc_value = 0;
>>   
>>    for (;;) {
>>       
>>    ADCStartConversion();   
>>
>>        while (ADCRead(&adc_value))
>>        {
>>            NutThreadYield();
>>        }
>>
>>       printf("Value: %u\n", adc_value);
>>               NutSleep(1000);
>>    }
>>   
>>    return 0;
>> }
>>
>> Get always the same values on the ADC (eg. ADC0==255, ADC7==1023), even 
>> if I play with the poti. With an external voltage meter I get different 
>> voltages as expected.
>>
>> Where is my error? I'm getting insane here. Just tried with 2 Ethernuts, 
>> every ADC Pin and nearly every ADC software configuration.
>>
>> Thanks in advance
>> Daniel
>> _______________________________________________
>> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
>>
>>
>>  
>>
>>     
> Hallo Daniel,
>
> I  missed the previous discussions. What kind of board do you use? CPU type?
>
> Greetings
> Andre
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
>
>   
It's an Ethernut 1.3 H.

Daniel