GPIO Demo Program etc

[AndrewR]

Hello, can someone point me to where there are some demo programs for working with GPIO as individual pins and creating a bus from a number of outputs. I am also looking for a demo program with general s/w based timers, for example, in mbed which is what I am porting from, you would do

thread_sleep_for(1000);  // 1ms timer or delay

and to create a bus

BusOut select_drv(dp11,dp4, dp5, dp6, dp9, dp10); //creates a bus called select_drv

thanks

AndrewR

(I attached the code)

[SofLit]

Hello,

For MBED questions please open a thread in their community.

[AndrewR]

Hello, I'm trying to get away from mbed* and on to a stable dev platform which is why I came here.  I really want to avoid using mbed moving forward and I dont want or need anyone to write or debug my code.I'm just looking for STM32Cube IDE demo programs so I can see how to work with the peripherals - are these available anywhere? Is there a repository where I can get these?

Regards

AndrewR

*mbed is going to be closed down in 2026, and developers are leaving the platform. There isn't any point in remaining with it.

[SofLit]

In that case you need to tell which board you are using in order to guide you efficiently.

[TDK · Accepted solution]

There is no "create a bus" function in HAL. You can control individual pins with HAL_GPIO_WritePin.

A delay of 1-2ms can be done with HAL_Delay(1)

[AndrewR]

Hi, I am using the NUCLEO-GO31K8

[Tesla DeLorean]

The STM32's group GPIO pins in groups of 16 per bank

GPIOB->ODR = 16-bit vector, for GPIO[0..15] on BANK B

GPIOB->BSSR = 32-bit vector, lower 16-bits SETTING, upper 16 CLEARING

The latter providing a way to set/reset a mix of pins, all or a subset, in a singular write operation.

For the Output Data Register you'd need to RMW (Read-Modify-Write) to mask off and set bits (pins) you want to change

The software here isn't going to generate a combining vector here, you'll have to manage that.