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art
Joined: 21 May 2015
Posts: 181
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| ADC problem |
 Posted: Tue Sep 15, 2015 1:28 am |
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Hi, i'm having trouble with ADC. Suppose when i used pic18f4550 it can be used for 10 bit ADC. But it only display 8bit. What is wrong with my code?
| Code: | #include <18F4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,error)
void main()
{
int i;
float min, value, max;
setup_port_a(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(0);
do {
min=1023;
max=0;
for(i=0; i<=1; ++i)
{
delay_ms(5);
value = Read_ADC();
If( value<=min);
min=value*5/1023;
If( value>=min);
max=value;
}
printf(" Voltage : %2.3f V NO: %3.0f ", min, max);
}while(TRUE);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Sep 15, 2015 1:45 am |
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Download the CCS manual for your compiler:
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Look in the section called "ADC". It's on page 48 in the Adobe reader.
(numbered page 38).
It says:
| Quote: |
#DEVICE ADC=xx
Configures the read_adc return size. For example, using a PIC with a
10 bit A/D you can use 8 or 10 for xx- 8 will return the most significant
byte, 10 will return the full A/D reading of 10 bits.
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The default is 8 bits. So you need to put in a #device statement right
after the #include for your PIC.
Also, this is going to fail to compile:
| Quote: | | #use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,error) |
Consult the CCS manual and fix it. |
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art
Joined: 21 May 2015
Posts: 181
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| Posted: Tue Sep 15, 2015 1:51 am |
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Thank you very much, problem solve.  |
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