Send data from master avr to specific pin in slave avr

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Hello every one .
I want to blink three different Led with master and slave avr eith spi protocol
I have interfaced the two avr with spi protocol the problem is when i press one of the three push buttons the three leds blinks. Because the receive condition is the same for the three leds . So i want to make the 2nd avr knows that which button i have pressed in the first avr.

What I have tried:

I have interfaced the two avr with spi protocol the problem is when i press one of the three push buttons the three leds blinks. Because the receive condition is the same for the three leds . So i want to make the 2nd avr knows that which button i have pressed in the first avr.

Posted 25-Apr-18 23:46pm

Member 13799356

Updated 26-Apr-18 0:25am

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Jochen Arndt · Answer 1 · 2018-04-26T00:27:00

Solution 1

This is rather unclear without knowing what you have done so far.

But all you have to do is sending data that indicates which button has been pressed. This requires the definition of a "protocol" that defines the meaning of the data transferred via SPI.

Posted 26-Apr-18 0:27am

Jochen Arndt

Comments

Member 13799356 26-Apr-18 6:55am

First of all thanks for your response, secondHow to send data that indicates which button i have pressed??

Jochen Arndt 26-Apr-18 7:11am

You have to define a protocol.
You can for example send a byte where the lowest bit is set when button 1 is pressed, the next when button 2 is pressed and so on.

Member 13799356 26-Apr-18 8:00am

can you please show me code example for this

Jochen Arndt 26-Apr-18 8:08am

I can't really because you have not shown any code you have written so far or even told us which programming language you are using.

A pseudo code C like example:

char data = 0;
if (isButton1Pressed)
data |= 1;
if (isButton2Pressed)
data |= 2;
if (isButton3Pressed)
data |= 4;
/* Now send data */

At the receiving side check which bit is set and act accordingly (e.g. switch the corresponding LED on or off).

Member 13799356 26-Apr-18 8:42am

Thank you !