TMS320F28335: C2000: input qualifier for GPIO in TMS320F28335

Hemanth Sundaresh

Part Number: TMS320F28335

Hello ,

I am using TMS320F28335 controller with 100MHz clock for my application .

I wanted to use input qualifier for only GPIO36.
For this I use below code:

GpioCtrlRegs.GPBCTRL.bit.QUALPRD0 = 255;		/* 5.1us sample period */
GpioCtrlRegs.GPBQSEL1.bit.GPIO36 = 2; 			/* 6 sample */

I want this input qualifier to be active for only GPIO36.

But the value in QUALPRD0 is applicable for GPIO32-39.

Will this impact the sampling rate of other GPIO's GPIO32, GPIO33, .. GPIO39?

regards,
Hemanth

over 6 years ago

0 Whitney Dewey over 6 years ago

TI__Guru 54185 points

If you have any of the other GPIOs between 32 and 39 configured with 3 or 6 samples in GPBQSEL1, they will also have the sample period. If you have them configured as synchronous or asynchronous, they won't be affected.

Whitney

0 Hemanth Sundaresh over 6 years ago in reply to Whitney Dewey

Intellectual 380 points

So if GPBQSEL1 is not configured to any value, it takes default "0" (after reset) mean the sampling happens at SYSCLKOUT?

0 Whitney Dewey over 6 years ago in reply to Hemanth Sundaresh

TI__Guru 54185 points

Right, by default they're synchronized to SYSCLKOUT and a sampling window isn't used.

Whitney

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TMS320F28335: C2000: input qualifier for GPIO in TMS320F28335