CCS/TMS320F28375D: GPxDAT writing issure

sasha_kuzya

Tool/software: Code Composer Studio

Hello!

I have a trouble with writing GPIO Data Register (GPxDAT). When I try write "1" in this register via firmware - output signal on port is:

Only double pulse. Port output doesn't change.

No problems with GPxSET and GPxCLEAR. When GPxDAT modified via CCS (Expressions window) all ok.

I have this trouble only on GPIO71. For other ports all OK (all port configuration is same). Port accessing from CPU2.

What am I doing wrong?

over 8 years ago

0 Nima Eskandari over 8 years ago

TI__Guru 52220 points

Can you share the small section of your code that sets up the GPIO as output and gives the ownership to CPU2?

0 sasha_kuzya over 8 years ago in reply to Nima Eskandari

Prodigy 180 points

Port setup on CPU1

/* MCU Output 1 */
GpioCtrlRegs.GPCMUX1. bit.GPIO71 = 0;
GpioCtrlRegs.GPCGMUX1.bit.GPIO71 = 0;
GpioCtrlRegs.GPCPUD.bit.GPIO71 = 0;
GpioCtrlRegs.GPCDIR.bit.GPIO71 = 1;
GpioCtrlRegs.GPCCSEL1.bit.GPIO71 = 0x2;

0 Nima Eskandari over 8 years ago in reply to sasha_kuzya

TI__Guru 52220 points

Are you writing to the GPxDAT register back to back?
This could be your problem: processors.wiki.ti.com/.../General_Purpose_IO_(GPIO)_FAQ_for_C2000

0 sasha_kuzya over 8 years ago in reply to Nima Eskandari

Prodigy 180 points

Thank you very much! This is my problem. I will use GPxSET and GPxCLEAR registers in my project.

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CCS/TMS320F28375D: GPxDAT writing issure