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Seba
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| Help please. If i set 1 bit of port E 3 pins go high.... |
 Posted: Wed Dec 14, 2005 11:35 pm |
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Hi,
i am having a problem with a device i built and have a major deadline for soon.
The code is very simple, basically i have 20 output ports, on a 18F8627 connected to external devices (LEDs) and they are turned on by a lookup table.
I was testing the device but the first 4 LEDs are connected to pins 4-7 of PORT E. I am able to turn on the one connected to E7, but every time i set any of E4, E5 or E6 they all go high together.
I am setting the whole port together, rather than individual pins with the following instruction:
output_e(frames[FE][whichFrame]) ;
I have similar instructions for LEDs connected to PORT J and D and they work perfectly.
Appreciate any help
Thanks in advance.
Sebastian |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Dec 15, 2005 12:28 am |
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Disable the External Memory Bus. It's enabled by default upon reset.
Add the code shown in bold, below:
| Quote: | #include <18F8627.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#byte MEMCON = 0xF9C
#bit EBDIS_BIT = MEMCON.7
void main()
{
EBDIS_BIT = 1; // Disable external memory bus
while(1);
} |
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