Tool/software: Code Composer Studio
Hi,
We have some issue for the GPIO of the TMS320F28232:
We want the GPIO76/GPIO77 to output high,There are 2 ways to slove these issues:
1.Modify the configuration register settings.
2.Defined the GPIO76/GPIO77 high.
now the first way is well and the other is failure.We used the same definition for the GPIO76 and GPIO77,
the signal of the high delay between GPIO76 and GPIO77(maybe 10ms - 200ms),please help to analyze why we met this issue,thanks?
Hi Cody，
Sorry to reply you later.
The below is the code of the GPIO initialization:
GpioCtrlRegs.GPCPUD.bit.GPIO76 = 0;
GpioCtrlRegs.GPCMUX1.bit.GPIO76 = 0;
GpioCtrlRegs.GPCDIR.bit.GPIO76 = 1;
GpioCtrlRegs.GPCPUD.bit.GPIO77 = 0;
GpioCtrlRegs.GPCMUX1.bit.GPIO77 = 0;
GpioCtrlRegs.GPCDIR.bit.GPIO77 = 1;
The solution 1:
Used the instruct of SET/CLEAR,the GPIO76/GPIO77 jump to high synchronous,the code as below:
GpioDataRegs.GPCSET.bit.GPIO76 = 1; //OUTPUT HIGH
GpioDataRegs.GPCSET.bit.GPIO77 = 1;
GpioDataRegs.GPCCLEAR.bit.GPIO76 = 1; //OUTPUT LOW
GpioDataRegs.GPCCLEAR.bit.GPIO77 = 1;
The Oscillograph waveform like as picture SET/CLEAR(Green:GPIO76,Yellow:GPIO77)
The solution 2:
Used the instruct of DAT,the GPIO76/GPIO77 jump to high desynchrony,the GPIO76 will be delayed and the
lenght don't uncertained,the code as below:
GpioDataRegs.GPCDAT.bit.GPIO76 = 1; //OUTPUT HIGH
GpioDataRegs.GPCDAT.bit.GPIO77 = 1;
GpioDataRegs.GPCDAT.bit.GPIO76 = 0; //OUTPU LOW
GpioDataRegs.GPCDAT.bit.GPIO77 = 0;
The Oscillograph waveform like as picture DAT(Green:GPIO76,Yellow:GPIO77):
So please help to check if there is error in our code for this issue,thanks?
Edited for correctness 4/23 1:30PM CST.
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Back-to-back writes to DAT registers do not function as expected. You should use solution 1 if you would like to toggle GPIOs.
Please see the wiki. 
Regards,
Cody
