GPIO baremetal drivers

Hi everyone.

I'm working on baremetal applications on Zedboard and I can't figure out where the GPIO config registers are defined.

The documentation says GPIO base address is 0xE000A000, and then a bunch of registers offsets are given, but I don't manage to get the definitions in any SDK project I did.

The solution I'm using for now is to hand write them in the main file (that's not kind of elegant).

I wonder if there is a generic header somewhere. I'm about to make my own and share it but I think it could not be such a good idea, I mean, perhaps I missed some details that are good reasons not to do it.

Is there any advice about that?

Thanks in advance for your answers.

0 Former Member over 10 years ago

When you perform the 'Export to SDK' step the base information about your hardware design, including the addresses, is passed to SDK. When you generate a BSP in the SDK a file named xparameters.h is generated with definitions for each of the registers in your design. For the PS GPIO registers you refer to the definitions will be something like:
/******************************************************************/

/* Definitions for driver GPIOPS */
#define XPAR_XGPIOPS_NUM_INSTANCES 1

/* Definitions for peripheral PS7_GPIO_0 */
#define XPAR_PS7_GPIO_0_DEVICE_ID 0
#define XPAR_PS7_GPIO_0_BASEADDR 0xE000A000
#define XPAR_PS7_GPIO_0_HIGHADDR 0xE000AFFF

/******************************************************************/

/* Canonical definitions for peripheral PS7_GPIO_0 */
#define XPAR_XGPIOPS_0_DEVICE_ID XPAR_PS7_GPIO_0_DEVICE_ID
#define XPAR_XGPIOPS_0_BASEADDR 0xE000A000
#define XPAR_XGPIOPS_0_HIGHADDR 0xE000AFFF

The default location for the xparameters.h file is going to be:

~/your-project-name/your-project-name.sdk/SDK/SDK_Export/your-application-name_bsp/ps7_cortexa9_0/include/xparameters.h

-Gary
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