16F88 problems

[GDetienne]

Hello,

after working with PCW 3.163, I have now the PCW 3.213. The reason of this change, I want to use the 16F88.

I try my two first programs with this Pic but nothing work. Then I use the projet wizard to be sure that I don't make mistake. But it is the same.(I use ICDU-40 to test but without it is the same)

Here the code given by the wizard (I have only write what is on the while {}).

First program : with extern xtal of 4 Mhz.

[PCM programmer]

I think your program is too complicated, as a first test program.
Try the following program. It's for use with an external 4 MHz
crystal. Of course, the crystal will require external capacitors.
A value of 22 pf will work. This program assumes the PIC
is running at +5 volts. Also check that the MCLR pin is connected
to +5 volts through a resistor. I believe CCS recommends 47K
for use with their ICD.

Use your ICD as a programmer only. Don't use it as a debugger
for this first test program.

[GDetienne]

Thanks PCM for your good and quick answer.

Your "very short" program work fine. If I change XT with INTRC_IO it work also without extern Xtal.

Now I try to implement the other set up and fuse to determine what was wrong.

Strange that the projet wizard give bad code.....
Have a nice week end.

[Guest]

PCM programmer,

I used your simple code (using the 16LF88 with PCW 3.215) for the internal RC.
It didn't work.
I add :
OSCCON = 0x6c;
and it's start working.
After some debugging I removed the line :
#device ICD=TRUE
And the internat OSC stop working.
Any idea please?
I use :
#fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, LVP


thanks

[PCM programmer]

I'm not at the company right now, so I only have vs. 3.219 to test
your problem.

1. Does your program have the #fuses statement above the #use delay
statement, like my sample program does ? Example:

[GDetienne]

Dear PCM programmer,

this week end I have start again my projet with 16F88. The same projet work with 16F876.

One test program with LCD and MCLR on port A work.
If I put two LED on port B. No caracters on my LCD.

I search and I send you (on this forum) the results or questions with my code.

Thanks in advance.

[wave_man]

I have begun work with a prototype brush motor controller board based around the 16F88. I am running at 20mHz, very clean clock. The critical "Hello world" milestone is passed.

The next step I am trying to accomplish is the reading of a single analog input port. The reading always comes up 0.0 in the serial window. The pin on the PIC reads 4.99V. Here is my code:

#include <16f88.h>
#device ADC=10
#fuses HS,NOLVP,NOWDT,PUT
#use delay (clock=20000000)
#use rs232 (baud=9600, xmit=PIN_B5, rcv=PIN_B2)
#include <stdlib.h>

main()
{
long reading;
float outp;
set_tris_a(0b00001011); //problem here?
set_tris_b(0b11000100);
setup_adc_ports (sAN1);
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(1); //should this be (0)?
setup_timer_0(RTCC_INTERNAL);

while(TRUE)
{
delay_ms(1000);
reading=read_adc();
outp=reading/1024;
// this is for 10-bit a/d setting
printf("\r\nThe reading is %9.4f ",outp);
//printf("\r\n hello world!");
}
}

If you can help out I would very much appreciate it.

wave_

[PCM programmer]

The problem is that you're dividing two integers. Since the numerator
is always smaller than the denominator, the result is always = 0.

You should change those numbers to floats. Example:

[wave_man]

Oh Jeez...

Type conversion error, what a rookie move. Thanks very much for your help.
I will try this fix out.

wave_man