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All,
I am trying to read the input from RA7 from the PIC16F917. The problem is that I cannot do so. Does anyone know why? Thanks-N-Advance
INCLUDE "modedefs.bas"
DEFINE OSC 4 'SET OSCILLATOR SPEED TO 4 MHz
OSCCON = %01100111 'Enable internal oscillator
LCDCON=$40 'DISABLES LCD
CMCON0=$07 'DISABLES COMPARITORS
TRISA = %10101111 'Set PORTA IO Ports (0 = output, 1 = input)
MAIN:
PAUSE 1000
SEROUT PORTc.1,N9600,[13,10,"pic_mon = ",#PORTA.7,13,10]
GOTO MAIN
END
What do you have A.7 connected to? What are you expecting?
And the internal OSC may not be good enough for serial. What are you sending to?
This chip has ADCON0, ADCON1, and ANSEL registers, all affect PortA
mackrackit...
What do you have A.7 connected to? I have it connected to a GPIO which outputs 3.3VDC
What are you expecting? Either a logic 1 or 0
And the internal OSC may not be good enough for serial. What are you sending to? I am sending to the com port on the PC, it outputs the message i want.
Well, that isn't going to be near enough voltage to connect into an RS232 port on a PC... A 5v signal is just barely enough, but seems to work in most cases. Either need to bump up to 5v or use a 3v-compatible MAX232-type chip in the middle.Quote:
Originally Posted by freddayz
Internal oscillators are sometimes accurate enough for serial communications, sometimes not. Best bet is to use an external oscillator.Quote:
And the internal OSC may not be good enough for serial. What are you sending to? >>>I am sending to the com port on the PC, it outputs the message i want.
I guess my question is not clear then...
I am trying to program RA7 on the PIC16F917 as an input with no success all I read is 0
As Joe mentioned about the ADC.
Take a look at this:
http://www.picbasic.co.uk/forum/showthread.php?t=561