CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

IC2 and SPI on Port B

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
vtrx



Joined: 11 Oct 2017
Posts: 141

View user's profile Send private message

IC2 and SPI on Port B
PostPosted: Mon May 18, 2020 6:18 pm     Reply with quote

I'm using simulation on Proteus, a circuit that uses SPI and IC2 communication.
I use B2, B3, B4 and B5 to control an LCD, and B0 and B1 for IC2.
In Proteus the simulation works.
I haven't set up the circuit yet, but because it works on Proteus, will it work on a real circuit?

Code:
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#define EEPROM_SDA  PIN_B0
#define EEPROM_SCL  PIN_B1

#define LCD_DC   PIN_B2  // data/command pin
#define LCD_DAT  PIN_B3  // data in pin (MOSI)
#define LCD_CLK  PIN_B4  // clock pin
#define LCD_CS   PIN_B5  // chip select pin, optional!

#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL, FORCE_HW)

#use SPI(DO = LCD_DAT, CLK = LCD_CLK, MODE = 3, BITS = 8, STREAM = LCD_STREAM)   //LCD USA SPI POR SOFTWARE
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

View user's profile Send private message

PostPosted: Mon May 18, 2020 6:46 pm     Reply with quote

https://www.ccsinfo.com/forum/viewtopic.php?t=47549


The answer to all proteus questions!
_________________
CCS PCM 5.078 & CCS PCH 5.093
temtronic



Joined: 01 Jul 2010
Posts: 9081
Location: Greensville,Ontario

View user's profile Send private message

PostPosted: Mon May 18, 2020 7:52 pm     Reply with quote

I've yet to see a Proteus schematic posted that will actually work in the real World.....1/4 century 'playin with PICs' and still waiting..
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

View user's profile Send private message

PostPosted: Mon May 18, 2020 11:57 pm     Reply with quote

As others have said, 'beware'.

I use Proteus. Now it's simulation of the PIC processor in general is 95%
'right' at best. It does not know about 'oddities' in individual chips,
and does not correctly handle many of the default things (the way
that pins float for example).
With 'care', it is possible to simulate, and get close to real behaviour.
However it is also possible to leave small things unconfigured in the
simulation, that in the real chip would be disastrous, and 'get away' with
these....
Generally, the more complex the peripheral, the worse the simulation
is. It behaves very badly when handling I2C for example.
I have circuits that Proteus says will not work, yet in a real chip they
run fine. I also have ones that Proteus says can work, but in the
real world fail.
The simulation of the PIC in particular seems worse than many other
chips. I suspect this is because of the sheer number of PIC models,
and the way that no two behave exactly the same.
It also ignores important things like interference, smoothing, and
capacitive loading, though figures for these exist in parts of the
simulation.

Relying on Proteus is in 'chocolate fireguard' territory.

I like Proteus as a PCB package. However the 'Isis' simulator is the
cause of more grief, especially among students, whose teachers seem
determined to encourage it's use, than almost any other package in
existence... Sad
vtrx



Joined: 11 Oct 2017
Posts: 141

View user's profile Send private message

PostPosted: Tue May 19, 2020 4:41 am     Reply with quote

Gabriel wrote:
https://www.ccsinfo.com/forum/viewtopic.php?t=47549


The answer to all proteus questions!


Thanks for the answer.
I don't think i asked correctly.
My question is not about Proteus, but if the portb can be used as I / O and at the same time IC2.
temtronic



Joined: 01 Jul 2010
Posts: 9081
Location: Greensville,Ontario

View user's profile Send private message

PostPosted: Tue May 19, 2020 5:47 am     Reply with quote

re:
Quote:
if the portb can be used as I / O and at the same time IC2

short answer Yes,

longer answer,
Which PIC ?

Are you using a hardware I2C peripheral or 'bit bang' I2C ? If the HW I2C, again yes. If SW, maybe, as it depends upon what is actually needed to be done.

Do you mean can the SAME I/O pin be used for BOTH I/O AND I2C ? generally no, but depending on what is attached to the pin...maybe...

'at the same time'. Depending on external devices(what's on the I/O pins) yes but there WILL be a determinable delay between say setting an I/O pin and an I2C operation. That'll be based on PIC clock speed, type of I/O( fast/std) and whatever the program is doing...

We'd need more specific information about the PIC and what it's supposed to do.....to give a better answer.
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

View user's profile Send private message

PostPosted: Tue May 19, 2020 6:16 am     Reply with quote

You only have pin B6 & B7 left.
Provided you use standard IO, and the standard functions to access these,
then 'yes'. However it is possible to write things in ways that won't work.
vtrx



Joined: 11 Oct 2017
Posts: 141

View user's profile Send private message

PostPosted: Tue May 19, 2020 6:29 am     Reply with quote

This is the initial configuration (18F2550)

Quote:
#define EEPROM_SDA PIN_B0
#define EEPROM_SCL PIN_B1

#define LCD_DC PIN_B2 // data/command pin
#define LCD_DAT PIN_B3 // data in pin (MOSI)
#define LCD_CLK PIN_B4 // clock pin
#define LCD_CS PIN_B5 // chip select pin, optional!

#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL, FORCE_HW)

#use SPI(DO = LCD_DAT, CLK = LCD_CLK, MODE = 3, BITS = 8, STREAM = LCD_STREAM) //LCD USA SPI POR SOFTWARE
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group