What does 1 << ( twint) mean?

[dl09]

If I write 1 << (twint) on an arduino ide, does that set or clear the twi interrupt flag of the twi control register? I tried researching on the internet, I cannot find an answer.

 

[srizbf]

If I write 1 << (twint) on an arduino ide,
does that set or clear the twi interrupt flag
of the twi control register? I tried researching on the internet,
I cannot find an answer.

the operation clears bitno_0 of the register.

 

[betwixt]

Are you sure?
1 << (twint) shifts a '1' left by '(twint)' times, it creates a value but does it change the contents of a register?

Brian.

 

[dl09]

Are you sure?
1 << (twint) shifts a '1' left by '(twint)' times, it creates a value but does it change the contents of a register?

Brian.

Honestly I don't know what it does.

 

[c_mitra]

1 << (twint) shifts a '1' left by '(twint)' times, it creates a value but does it change the contents of a register?

You are right; it does nothing because the contents are not assigned a location. I think the result will be left into the accumulator and discarded.

You need an assignment statement: x=1<<2; (or something like that); it can also be part of another expression.

 

[ZASto]

Honestly I don't know what it does.

If you don't know, just click on Help -> Reference and, if you are lucky, you will find this page:

file:///home/zasto/arduino-1.8.12/reference/www.arduino.cc/en/Reference/Bitshift.html

Don't be shy to consult Help

 

[c_mitra]

Is TWINT a system variable? Often the system variables are written in ALL CAPS!!

Take a look at https://www.engineersgarage.com/tutorials/avr-atmega32-twi-registers/

Perhaps you can understand now a little better.

If the TWINT bit was set, 1<<1 will give 10 and the TWINT bit will be unset. If the bit was unset, it will be set. But that can be done in many different ways.

See examples here: https://web.engr.oregonstate.edu/~traylor/ece473/lectures/twi.pdf