How to use PIC controller to control the 184 input signal to PC interfacing?

[Help]

Hai....

Can you help me answer the PIC uconrtoller in C program??

i have 23 Buffer (74HC244) and 2 of CD4514 16-non-inverting decoders, how to use PIC controller to control the 184 input signal to PC interfacing??

Thy...

 

[Lepidoptera_ece]

atmega max7301

Can you post your schematics for us to asses your problem, by the way what PIC microcontroller are you planning to use???

 

[Help]

max7301 bus

Can you post your schematics for us to asses your problem, by the way what PIC microcontroller are you planning to use???

16f84 or 16f877 using C to program it, do you know how to write the program??

 

[gidimiz]

Re: I/O Interfacing

Hi,

Yes you can do what you wrote, or you can use Port Expanders like the:
MAX7301 28 ports with SPI interface.
MAX7310 8 ports with I2C interface.
MAX7311 16 ports with I2C interface.

Thet are better because you can get an interupt from them and only then read the IC. And also all off them can be connected togather to them data bus.
With your desigen you will have to scan all the ports over and over.

Good luck.

 

[manu]

Re: I/O Interfacing

Look on AN234 from microchip ;-)

Regards,

Manu

 

[Lepidoptera_ece]

Re: I/O Interfacing

Hi,

Yes you can do what you wrote, or you can use Port Expanders like the:
MAX7301 28 ports with SPI interface.
MAX7310 8 ports with I2C interface.
MAX7311 16 ports with I2C interface.

i agree,. plus youll have lesser wires or connections which lessens your hardware debugging problems.....

 

[Help]

Re: I/O Interfacing

Hi,

Yes you can do what you wrote, or you can use Port Expanders like the:
MAX7301 28 ports with SPI interface.
MAX7310 8 ports with I2C interface.
MAX7311 16 ports with I2C interface.

i agree,. plus youll have lesser wires or connections which lessens your hardware debugging problems.....

Hai.....

MAX7311 izit microcontroller, need compiler, need programmeble ??

Thy....

Added after 10 minutes:

Hi,

Yes you can do what you wrote, or you can use Port Expanders like the:
MAX7301 28 ports with SPI interface.
MAX7310 8 ports with I2C interface.
MAX7311 16 ports with I2C interface.

Thet are better because you can get an interupt from them and only then read the IC. And also all off them can be connected togather to them data bus.
With your desigen you will have to scan all the ports over and over.

Good luck.

Hai......

Do you know more about this?? Can you give more knowledge about I2C, i head I2c before but to write the program is very difficult izit... Can you teach me how to write the program in C step by step, how to start interface with simple data first??

Thy....

 

[gidimiz]

Re: I/O Interfacing

Hi,

go to this web site link for I2C information:
http://www.microchipc.com/sourcecode/#i2c

The full specification for the I2C bus:
**broken link removed**

It will give you the examples that you need.
Also, i have included the ssample file that comes with the hi-t*ch compiler. I dont know if you can find it on the web, so here it is.

Good luck.

 

[Help]

Re: I/O Interfacing

Hi,

go to this web site link for I2C information:
http://www.microchipc.com/sourcecode/#i2c

The full specification for the I2C bus:
**broken link removed**

It will give you the examples that you need.
Also, i have included the ssample file that comes with the hi-t*ch compiler. I dont know if you can find it on the web, so here it is.

Good luck.

Hai....

Do you have any mail, msn, icq,.... therefor i can contect you easy when i face the problem... I hope that you can help me....

Thy....

 

[gidimiz]

Re: I/O Interfacing

Hi,

Please post your email or MSN and i will get intouch with you.
I do prefer to do that over the EDABoard so other people will also learn the problems that you had and how you overcome them. I have learned that people make the same mistakes and this board was built to share their experiance.
I do have the knolage to help you, just because i had the same problemes as you did and i hade to read all the files that i posted for you.
If you will read them you will see that you will incounter more probles but you will know how to over comethem with your understanding of the protocol.

After this short lecture, I will be more then happy to help, post your MSN here or your email and i will get intouch with you.

Good luck.

 

[artem]

I/O Interfacing

Are there any other chips for spi expansion with interrupt capability ?

 

[gidimiz]

Re: I/O Interfacing

Hi,

I2C:
Philips - PCA9534
and PCF8574

There are a lot on the market. I used the MAX so i know about them. I did a search on google for " i/o expanders ic spi" and i found lots of links.

If you will have a list, please post it here.

 

[artem]

Re: I/O Interfacing

Hi,

I2C:
Philips - PCA9534
and PCF8574

There are a lot on the market. I used the MAX so i know about them. I did a search on google for " i/o expanders ic spi" and i found lots of links.

If you will have a list, please post it here.

It looks that those are for I2C not SPI and no interrupt capability . I need about 64 ports on my atmega 128 using SPI and with interrupt capability as input signals are very short and Ucos time slice (10 msec) does not allow short time scanning and will consume a lot of cpu time .
For noninterrupt based SPI IO 74hc165 and 74hc595 will be enough and cheaper than max .

Looks MCP23008 is what i need .

 

[gidimiz]

Re: I/O Interfacing

Hi,

The MCP23008 looks like a noce chip. I also found an application note at microchip that shows how to connect the PIC10F2XX to the MCP23008.
https://ww1.microchip.com/downloads/en/AppNotes/00972a.pdf
Thanks.

 

[artem]

Re: I/O Interfacing

I was partially incorrect regarding maxim chips . 7301 provides 20 to 28 gpio ports but implement interrupts only on 8 ports . No interrupt flag register for individual port
is available .

 

[Help]

Re: I/O Interfacing

Hi,

Please post your email or MSN and i will get intouch with you.
I do prefer to do that over the EDABoard so other people will also learn the problems that you had and how you overcome them. I have learned that people make the same mistakes and this board was built to share their experiance.
I do have the knolage to help you, just because i had the same problemes as you did and i hade to read all the files that i posted for you.
If you will read them you will see that you will incounter more probles but you will know how to over comethem with your understanding of the protocol.

After this short lecture, I will be more then happy to help, post your MSN here or your email and i will get intouch with you.

Good luck.

Hai gidimiz..

So long to reply to you very sorry because i hade something to do.
Tq for your help. My MSN is tangbc8013@hotmail.com, tangbc05@yahoo.com

Thank