Set/Reset/ LatchBits

Projects Programming
1

I have 32-bit MCU. The port uses 32 digital IO functionality.

I am looking for a sample code to Latch a particular bit/particular pin in PORTA Set/RESET function particular bit In port A.

Can someone guide me on how it can be done using AND/OR/XOR operation?

2

digitalRead() will capture the state of the pin when read

3

I assume you have some reason for not using the digitalRead() and digitalWrite() functions.

To set a bit first read the register (using the proper built-in) then OR the bit you want set with the value you read and then write the register back. To clear a bit AND in the complement of the bit you want to clear.

4

See

  Arduino direct port manipulation

with your favorite search engine.

byte thePort = PORTA;

then

 PORTA = bitSet(thePort, 3);

or

PORTA = bitClear(thePort, 3);

will turn on or off bit 3 of the port.

Which must be an output pin to be seen, obvsly I hope.

You could go out and learn how to do it as @oldcurmudgeon says, it is worth knowing that kind of bit operating don't rely on some fancy functions that do the same thing.

a7

5

Which 32 bit CPU?

6

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