CompSystems 245 - Week 3 - Lecture 7 - Inputs and Outputs

Describe GPIOs:

• what they are

• what they are connected to

  • what the connections do

Describe the examples of input and output connects to GPIO pins:

• inputs

• outputs

Describe how GPIO pins relate to memory:

• the need of registers by GPIO pins

• address space of I/O devices

  • how data is sent and received to and from devices

• draw a figure depicting the hardware need to support two memory-mapped I/O devices

Describe the digital signals of a GPIO:

• When are signals high or low

• TTL signal levels

• CMOS signal levels

• the compliancy of STM32F407 I/Os

• the data sheet for a STM32F407VG

Describe the setting of a GPIO pin to output:

• How to do it

• what it does to the pin

  • how to let it do more

• schematic of output configuration

• Describe the configurations you can set it to

Describe the setting of a GPIO pin to input:

• How to do it

• what it does to the pin

  • how to let it do more

• schematic of input configuration

• Describe the configurations you can set it to

• How uncertain voltage signals are handled

Describe the Schmitt trigger:

• Its circuit symbol

• What it is

• what it does

Describe switch bouncing:

• what it is

• consequences

Describe debouncing:

• What it does

• How it can be solved

• what the solutions do