ADC setpu in CCS c Code. How to do it?

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jayanth.devarayanadurga

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I want to know how to setup adc ports in CCS C Compiler. I am using PIC16F887 MCU for the project. I will be using all the analog pins for adc and I will be using the Vref- and Vref+ pins for reference voltage. vref- will be connected to ground and vref+ will be given +2V.

I need an example for setup_adc_ports() function. What should be the arguments for the function? Should I define Vref somewhere else in the code?

I also want to disable the comparators on PORTA.
 

setup_adc_ports(sAN0|sAN1|sAN2|sAN3|sAN4|sAN5|sAN6|sAN7|sAN8|sAN9|sAN10|sAN11|sAN12|sAN13|VREF_VREF);
setup_adc(ADC_CLOCK_DIV_8);
I also want to disable the comparators on PORTA.
Click to expand...
setup_comparator(NC_NC_NC_NC);
 

I tried that but it doesn't work. I gave 1.5V which is max value of LM35 output to AN0 and gave +2V to Vref+ pin and 0V to Vref- pin. for 2V it has to give 1023 raw adc value and for 1.5V it should give 767.25 raw adc value but it is not giving the right value.

Edit: I am getting 1023 raw adc value if I give 0V to Vref- and +2V to Vref+ and 1.5V to AN0
 
Last edited:

hello!!
which version of ccs c compiler do u use ?
-if you dont know how to code it, you should be able to chose analogical channels from the Wizard .
this is a simple example : setup_adc_ports(AN0_AN1_AN2_AN3_AN4); which means there are five adc channels .
-setup_adc_ports(AN0_AN1_AN2_AN4_AN5_AN6_AN7_VSS_); == VRef=A3
 

@DR.boy

My CCS C is v4.140. The latest vis 4.141

I will try setup_adc_ports(AN0_AN1_AN4_AN5_AN6_AN7_VSS_VDD); Will this take AN2 ad Vref- and AN3 as Vref+ ??

No. setup_adc_ports(AN0_AN1_AN2_AN4_AN5_AN6_AN7_VSS_); doesn't compile. It gives error.
 

hi
sorry for delay , i went and i back

try this
setup_adc_ports(AN0_AN1_AN4_AN5_AN6_AN7_VREF_VREF);

- - - Updated - - -


good luck !
 
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