Setting multiple pins simultaneously

Author	Message
Mixtel90 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 9022	Posted: 06:44am 16 May 2025       But on the RPxxxx you have the pad between the junction of the output buffer and the input buffer. You can read back what the output buffer is set to (but there's no point really). However, the pad can disable the pin so you aren't seeing it at all. :) You can *simulate* things like I2C on the RPxxxx. It's output is totem pole though, and the top device can't be disabled so there is no open drain output. True I2C is actually impossible. You have to force the pin to output low then switch IO mode between input (Hi-Z) and output (low).
CaptainBoing Guru Joined: 07/09/2016 Location: United Kingdom Posts: 2171	Posted: 07:45am 16 May 2025       @Nimue Nice project... retro to the max!!!
circuit Guru Joined: 10/01/2016 Location: United Kingdom Posts: 308	Posted: 07:47am 16 May 2025       Nimue, just in case you had not noticed, a very useful new command was introduced in the first Release Candidate (RC0), allowing direct editing of bits in an integer variable.  This gives a very simple method of setting specific bits in a control integer for various interfaces including sending values to PORT(). Peter introduced this as a method for setting flags and subsequently withdrew it an alternative method of flag handling.  It then became obvious that it had other applications including setting values for PORT() and also for sending binary strings to power logic shift registers (I use the TPIC6A596) and Peter was requested to reintroduce it, which he kindly did.   Quote   New Commands and Functions Command BIT(var%,bitno)=0 or 1  'sets a specific bit (0-63) in an integer variable Function BIT(var%,bitno) 'returns the value of a specific bit (0-63) in a integer variable (0 or 1) Edited 2025-05-16 17:49 by circuit