SPI communication between two controller

dasar_pavanraju — Fri, 14 Dec 2018 06:56:48 GMT

Hi All,

Using 2 MM9z1_638 controller for SPI master and SPI slave.

In datasheet it mentioned as when it configured as Master---->Clock should be bus clock/2

when it configured as Slave---->Clock should be bus clock/4

So i decided to keep bus clock /4;

I am using bus clock as 28Mhz.

am using SPI to ensure both controllers are running on same time.

Initially mater will send character 'R'.Slave will reply with 'R'.

Then both will start executing there code.

To verify sync,I enabled 500ms timer. Every 500ms tone counter will increment both sided.

For every one sec master will ask counter value of slave and also stores its count value.If both counter are same then both are in sync.

But problem is

in master = 2,4,6,8,...

from slave =0,0,2,4

Initially two bytes getting 0.

Then i decided to send some dummy data from slave to master whenever interrupt hits.In this condition am getting proper value.

also i checked both are running on same speed.

Please let me know the problem.

Thanks,

Pavan

Re: SPI communication between two controller

danielmartynek — Wed, 02 Jan 2019 13:57:17 GMT

Hi Pavan,

Please see my comments here:

Thanks,

Daniel