Please, help! (18F series)

[otxoasound]

Hello.

It is the first time I post here. I need help. It is the first time I am using a 18F26J53. The program is very simple. I am just trying to blink a led. I am using the internal oscillator with the PLL to get 48 MHz. The program works in Proteus, but not in the real circuit. Here is the code:


#include <18f26j53.h>
#fuses PLL2 //8 MHz internal oscillator divided by 2 to get 4 MHz to PLL.
#fuses PLLEN //Enables PLL.
#fuses NOCPUDIV //I want 48 MHz, so I don´t need to divide it.
#fuses NOPROTECT //Code not protected.
#fuses NOWDT //No Watchdog.
#fuses INTRC_PLL_IO //Internal oscillator with PLL. No CLKOUT in RA6.
#fuses SOSC_DIG //I want to use RC0 an RC1 as digital IO.
#fuses NOCLOCKOUT //No clockout in RA6.
#fuses NOFCMEN //Disables Fail-safe monitoring.
#fuses NOIESO //Disables switching between internal and external osc.
#fuses NODSWDT //Watchdog disabled in sleep mode.
#fuses IOL1WAY //Multiple remappable pin configurations disabled.
#fuses NOWPCFG //Configuration words not protected.
#fuses LS48MHZ //If we use low speed USB (48 MHz/8 = 6 MHz).
#fuses RTCOSC_INT //RTCC uses internal oscillator.
#use delay (clock=48000000)
#byte port_B=0xF81
//--------------------------------------------------------------------------------
void main (void)
{
set_tris_b(0x00);
while(TRUE)
{
port_B=0xFF;
delay_ms(1000);
port_B=0x00;
delay_ms(1000);
}
}


Thank you in advance for you help!!!

[Ttelmah]

Try disabling the ADC.
Normally the port wakes up set up for analog I/O.
So:
(use the code buttons...)

[otxoasound]

Hello.

Thanks for your help. When I simulate the code in MPLAB, the ADCON registers does not change. I add setup_adc(adc_off) too and nothing changes. Also, when I try to write FF to port A, in MPLAB, the register adquires the value EF. I can put FF in port A, only EF.

Thank you again.

[ckielstra]

[otxoasound]

Hello.

Yes, I forgot that port A was a 7 bit port. Thank you. The problem is that it does not work. The leds does not blink (always off). There is a voltage of 0,3 V in the port pins. I noticed that I forgot enable PLL. But it has not solved the problem. The new code (using port B) is:

[ckielstra]

You are not a quick learner, aren't you?
- Ttelmah said to disable the ADC as this is enabled by default. PortB pins 0 to 3 all have analog inputs...
- I asked you to post your compiler version number, you didn't post it.

[Ttelmah]

[otxoasound]

This is for ckielstra: Maybe I am not a quick learner, but you should read before write. In previous posts I wrote that I disabled all analog inputs (turning off the ad converter and disabling all analog inputs) so this is not the problem.
This is for the pollite people (not ckielstra, of course): the compiler version is 4.114

Thanks

[ckielstra]

Maybe I'm not nice (I admit it is not my best day today), but all we have is your posted code and in the last version you didn't disable the analog ports.

I don't have v4.110. Can you post the full list file (*.lst) so we can compare the generated code to a newer compiler version?

[otxoasound]

Hello.

Here is the .lst file:

[Mike Walne]

You're still not disabling analogue, and there is no need in CCS for the TRIS.
Ttelmah showed you both of these with a rewritten code sample in his first response.

Mike

[ckielstra]

I don't have the time now to check everything, but it turns out the CCS compiler adds code for disabling the analog ports by default:

[kaem1189]

Hello,

Have you tried disabling spi, i2c and uart as well as ccp? I see that port B is multiplexed with these features.

[PCM programmer]

I don't have an 18F26J53, but I do have an 18F27J53 and they are in
the same PIC family. This code works. It was tested in hardware with
vs. 4.114.

[Ttelmah]

Yes. The code I posted, worked for me on 4.110, which didn't automatically set the bits for digital I/O. I gave up at that point....

Best Wishes