Hardware and software control of pins

vikas saxena

Prodigy 250 points

Whats the difference between hardware and software control of pins regarding GPIODirModeSet() ?

Also, since the direction can also be configured using GPIOPinTypeGPIO______, then why do we use GPIODirModeSet() ?

over 11 years ago

0 Amit Ashara over 11 years ago

TI__Guru**** 244400 points

Hello Vikas,

GPIODirModeSet is called by GPIO Functions for setting Pins for different peripherals.

Hardware control is where a peripheral directly controls the pin

Software control is where the GPIO is driven 1 or 0 by the CPU Software.

Regards

Amit

0 vikas saxena over 11 years ago in reply to Amit Ashara

Prodigy 250 points

But I think, GPIOPinTypeGPIOOutput() also does the same thing? (correct me if I am wrong)

0 Amit Ashara over 11 years ago in reply to vikas saxena

TI__Guru**** 244400 points

Hello Vikas,

Yes, it also calls the same GPIODirModeSet but in this case it passes the 3rd parameter as GPIO_DIR_MODE_OUT in which case the AFSEL bit is cleared allowing the CPU to directly write/read the GPIO.

Regards

Amit

Arm-based microcontrollers

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Hardware and software control of pins