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RF_Developer:::::

thanks for ur quick response sir.......

but if i need to send a data from the slave side to the master side how to do???????

u said the master must ask slave's data...
ho ...

Hi all...

I am using the following for the project:
Two PIC18F4431.
Two motors with encoders

I tried to send and receive encoder position values between the PIC controllers through SPI.

I ...

FvM sir,,,,,,,,,,,

i can't get you.......
sorry.......

is there any possibilities to receive 16 bit data or 32 bit data in ISR?????????

so..

Can i take conclusion like this:

ISR receives 8bit only synchronously but not 16 or 32 bit...

But in main it is possible to receive 16 bit data without problem....

right????

Hi RF_Developer...
first of all
thanks for your interest u took in this ...

i know that data transmission is byte based...

but one issue:

i could not receive 16 bit data in ISR...

but i ...

hi..

i was trying to receive 16 bit data in SPI using
spi_xfer function.

i am able to receive values correctly when i receive values in main...
i am not able to receive values when i use ISR ...

#include <18F4431.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)

#byte MCHH=0Xf65 //SET THE MAX COUNT HIGH
#byte MCLL=0Xf64 //SET THE MAX COUNT LOW
#bit up ...

EUREKA..... EUREKA.....

found the theory behind it......

IC3DR:

this is the interrupt which gets generated whenever there is a change in direction of rotation of motor.

IC2QEI:

this int ...

hi.
I am using pic 18f4431.
When qei is used with older versions it was working fine.

Now updated to the latest version.

This is my code:

#include <18F4331.h>
#fuses HS,NOWDT,NOPROTE ...

Previously I was using older versions of CCS.

I was working with Quadrature Encoder Interface...
in that while I was using qei, the setup was like this:
setup_qei(QEI_RESET_WHEN_MAXCOUNT,QEI_ ...

sir.... ttelmah....

i've said wrongly as PWM interrupt....
ok fine...

correct me if my logic is wrong.....

when the current exceeds some marginal value in one direction i need to run motor i ...

hi..

i am working on a project where i need to work with pwm for speed control of 9v dc motor.

i am using PIC18F4431.

i would like to know how to work with PWM in this.
what are all can be d ...

thank you for ur active and rapid answer...

so spi_data_in will not interrupt but we can read data throu that....
right?????

SSP ISR can be used when SPI data is sent to slave from master.

during that time interrupt will be generated and SSP ISR is called and we can read SPI data using spi_read(); in SSP ISR.
i have no ...

@Ttelmah:

ya sir...
using delay will be not a good idea...

but i want to make D6 =0 and D7=1 when i get 0x80 data throu SPI.
and D6=1 and D7=0 when i get 0x81 data throu SPI in the slave side. ...