How to get GPIO pin status ?

[bd678834]

Posted on December 27, 2009 at 16:04

How to get GPIO pin status ?

[bd678834]

Posted on May 17, 2011 at 13:35

Hello !

First of all i want to thank all who helped me to get started with STM32 :-] Now i want to write a program that reports gpio pin MODE and gpio pin SPEED of a certain GPIOx port via rs232 to my computer. Can some one please suggest me how do i get that GPIOx pin info ? Can i get that info from CRL/CRH ? How do i access to a specific port pins configuration ? Thanks :)

[armmcu]

Posted on May 17, 2011 at 13:35

Yes Right , you can get it from CRL/CRH registers.

Cheers.

[sofiene]

Posted on May 17, 2011 at 13:35

Hi bd678834;

of course you can get the GPIO info from CRL/CRH registers since they are ''rw'' (read/write) access. For the specific port configuration you can use the standard library or you can do it using the direct access to the registers: GPIOC->CRL = u32_Value; // to configure port C pins u32_Value = GPIOC->CRL; // to read the pins configuration of port C B.R. M3allem

[tomas23]

Posted on May 17, 2011 at 13:35

Hello bd678834,

why this? The pins have their default configuration (input hi-Z, except some pins like JTAG, all described in the datasheet), and you as a programmer are responsible for changing them. So reading CRL/CRH is good approach, but a little unnecessary (I guess) because you should already know the result :)