Hi.
I am a beginer in pic microcontroller and i need some help. I have a development board from Microchip, PICDEM Mechatronics with a pic16f917 microcontroller.
I use MPLAB IDE v8.70 and HI-TECH ANSI C Compiler.
In code if the current provided from a potentiometer is less than a threshold (2.5 V) the diode D0 must be ON, else OFF.
When i run the code in debug mode i receive the next error :
ADC-W0001: Tad time is less than 1.60us
ADC-W0008: No stimulus file attached to ADRESL for A/D.
I do not understand why i receive this error since the Fosc is 8MHz, AD conversion clock is 16.
So, with this setings i computed the
Tad = 2 microsec.
The code :
#include<pic.h>
__CONFIG(FCMEN_ON & IESO_OFF & CP_OFF & WDTE_OFF & BOREN_OFF & MCLRE_ON & PWRTE_OFF);
#define ZERO0
#define ONE1
unsigned int ADC_result;
unsigned char ADC_channel;
void Clock_Init(void)
{
// Internal Oscillator Frequency Select bits - 8 MHz
OSCCONbits.IRCF2 = ONE;
OSCCONbits.IRCF1 = ONE;
OSCCONbits.IRCF0 = ONE;
// Set the ADC clock frequency Fosc/16 = 500 KHz
ADCON1bits.ADCS2 = ONE;
ADCON1bits.ADCS1 = ZERO;
ADCON1bits.ADCS0 = ONE;
}
void Comparators_Init(void)
{
// Comparators Off
CMCON0bits.CM2 = ONE;
CMCON0bits.CM1 = ONE;
CMCON0bits.CM0 = ONE;
}
void Port_Init(void)
{
// Pin RA3/AN3 is set input
TRISAbits.TRISA3 = ONE;
// Set RA3/AN3 to analog mode
ANSELbits.ANS3 = ONE;
// Set RD7 as an output
TRISD = ZERO;
PORTD = ZERO;
}
void ADC_Init(void)
{
// A/D result left justified
ADCON0bits.ADFM = ZERO;
// +/- Vref.
ADCON0bits.VCFG1 = ZERO;
ADCON0bits.VCFG0 = ZERO;
// Analog channel 3 selected
ADCON0bits.CHS2 = ZERO;
ADCON0bits.CHS1 = ONE;
ADCON0bits.CHS0 = ONE;
// Select ADC Channel
ADC_channel = ADCON0bits.CHS;
// Switch on the adc module
ADCON0bits.ADON = ONE;
}
unsigned int ADCRead(void)
{
// Start conversion
ADCON0bits.GO = ONE;
// Wait for the conversion to finish
while(ADCON0bits.GO == ONE);
ADC_result = (ADRESH<<8) + ADRESL;
// Switch off adc
ADCON0bits.ADON = ZERO;
return ADC_result;
}
void main (void)
{
Clock_Init();
Comparators_Init();
// Init port pins
Port_Init();
// Init ADC
ADC_Init();
// code will run in for loop forever
for( ; ; )
{
// Read Channel 3
ADC_result = ADCRead();
if(ADC_result < 2.5)
{
PORTDbits.RD0 = ONE;
}
else
{
PORTDbits.RD0 = ZERO;
}
}
}
1. You are not setting up the clock selection bits in the configuration register. The default is for an external RC oscillator. see page 185 of the datasheet.
2. The error messages imply you are using a simulator , not the debugger.
