8-bit MicrocontrollersのトピックRe: ADC conversion

ADC conversion

ppcco — Wed, 08 Mar 2006 23:20:33 GMT

Hi, I'm sensing light with a photoresistor, the analog input is received via QB8 A/D converter in 10 bit, my program is wrote in C (CW) the question is, how can convert the 10 bit value into decimal value?, the binary value is stored in two different registers, 8 LSB in an register and two MSB in another, someone have a routine write in C to implement? Thanks.

Re: ADC conversion

alex_spotw — Thu, 09 Mar 2006 01:29:02 GMT

Hi:

If you're using Processor Expert, you can use one of the methods provided by the ATD Bean to read the value as 16 bits.

If you're not using PE, you can use code like:
(From PE)
/* 16-bit register (big endian) */
typedef union {
word w;
struct {
byte high,low;
} b;
} TWREG;

word Read_Sample(void)
{
TWREG Sample

Sample.b.high = ATD1RH;
Sample.b.low = ATD1RL;
return Sample.w; // Return as word (16 bit)
}

Regards,

Alex

Re: ADC conversion

FWFan — Fri, 05 Sep 2008 01:17:46 GMT

Hi ppcco,

I'm trying to capture my filter signal with my 8 bit QE128 board too. Do you think I can see your code for your ac signal capture?

Thank you,

FWFan