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Recent Forum Posts

Re: I/O Pin status during startup

Greetings all,

first of all, thank you so much for all your help.

I tried moving the port settings before the Tris statement like you recommended and it worked!

...
PaulMaker Today, 09:21

Re: I/O Pin status during startup

Hi, Tumbleweed

the funny thing is I had added the port setting lines right before the TRIS statements for a run With MPLAB 8.92 sim ...

...
Acetronics2 Today, 09:12

Re: I/O Pin status during startup

The important part is to set the PORT (or LAT) registers BEFORE setting the TRIS registers to outputs.
Otherwise the pins will be in output mode for a period of time but the outputs aren't specified.
tumbleweed Yesterday, 20:01

Re: I/O Pin status during startup

did you simply try to add :

INIT:

PORTA=%00000000
PORTB=%00000000
PORTC=%00000000
Acetronics2 Yesterday, 15:55

Re: I/O Pin status during startup

before you go to too much trouble try what henrik suggests

clear all output ports before setting the tris registers and lose that delay in between
richard Yesterday, 13:07

Re: I/O Pin status during startup

Hi Richard, thanks for the help.

Regarding the drawing...will try to get it and post here.
In the meantime here are the answers:

The LEDs are connected to ground
PaulMaker Yesterday, 12:17

Re: I/O Pin status during startup

So, looking at your code....effectively it boils down to

TRISA = %00000000 ' This enables 23 of 24 output drivers, pins goes to whatever state PORT/LAT says
TRISB = %00100000
TRISC =...
HenrikOlsson Yesterday, 12:16

Re: I/O Pin status during startup

are the leds connected to gnd or vdd ?
are the leds powered by the same supply?
what size is the led series resistor ?

and what does actually happen compared what you expect to happen

note...
richard Yesterday, 11:28

Re: I/O Pin status during startup

Greetings all,

thank you all for your inputs.

Here is the code:

'****************************************************************'* Name : Led Controller.PBP ...
PaulMaker Yesterday, 10:05

Re: 18f25k22 hserin

Specialy when the GM65 user manual mention TTL logic level, yes the DC supply is 5V, for the USB / UART ports.

but it's not specify 3.3V Tx/Rx output line.

Learning everyday like everyone here.
jackberg1 - 20th January 2025, 04:06

AMICUS

What is Amicus18?

Amicus is a multifunction development system inspired by the popular Arduino board, however, the Amicus board uses a Microchip PIC^® microcontroller instead of an Atmel AVR^tm type.

Comprehensive documentation and a helpful and friendly support environment, make using Amicus18 an easy and enjoyable experience for beginners and seasoned programmers.

Forum Moderator Mackrakit (Dave) very kindly ported the Proton BASIC Compiler code over to PBP3 and modified the original AMicus18 docuemts for PBP3 users.

...

Read More

The Amicus18 Board

Amicus18 is an embedded system platform based on a simple open hardware design for a single-board microcontroller, with embedded I/O support and a standard programming language. A great Partner for PBP3 and Perfect for the PBP3 Experimenter.

AMICUS18 in our on-line shop

...

Read More

Companion Sheild

The entry level shield is labelled The Companion Shield. This is a PCB laid out in the pattern of a solderless breadboard. The holes are single sided, which means that components can easily be removed using solder mop braid, or a solder vacuum tool, if a mistake is made, or components need to be re-used.

The (PBP3) Companion Shield Manual iCan be downloaded from here

See the Companion Shield in our on-line shop
...

Read More

GPS Shield

The Amicus GPS shield contains a multi channel GPS receiver, as well as a 16k byte (128 kbit) serial (I2C) eeprom, and a 3 Volt, 12mm battery socket in order to maintain the receiver's built-in RTC (Real Time Clock).

Available in our on-line store

...

Read More

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