CCS/TMS320F28335: f28335

richa mishra

Part Number: TMS320F28335
Other Parts Discussed in Thread: CONTROLSUITE

Tool/software: Code Composer Studio

Hello All,

I have written logic to generate switching signals and assigned to gpio pins.But I am not getting output. Where is the possibility of issue here?

Please throw some light on it.

Regards

Richa

over 8 years ago

0 Richard Poley over 8 years ago

TI__Mastermind 27200 points

Richa,

The problem could one of many possibilities. Check you have configured the GPIO pins as outputs (the pins default to inputs at power-up). If you are using any peripherals, check you have enabled the clock to those before writing to their registers.

The header files in controlSUITE should help you, especially the "gpio_setup" and "gpio_toggle" examples there. If you have controlSUITE installed at its' default location, the examples will be at:
C:\ti\controlSUITE\device_support\f2833x\v142\DSP2833x_examples_ccsv5

Regards,

Richard

0 richa mishra over 8 years ago in reply to Richard Poley

Prodigy 100 points

Setting GPIO pins

GpioCtrlRegs.GPADIR.bit.GPIO19 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO18 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO17 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO16 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO15 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO14 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO13 = 1;
GpioCtrlRegs.GPADIR.bit.GPIO12 = 1;

generating logic after few lines of code
GpioDataRegs.GPADAT.bit.GPIO12 = gpu[0];

0 Richard Poley over 8 years ago in reply to richa mishra

TI__Mastermind 27200 points

How are you writing data to the pins?

0 Manoj Santha Mohan over 8 years ago in reply to richa mishra

TI__Guru 55700 points

Richa,

These registers are EALLOW protected. Please check whether EALLOW is enabled.

Regards,
Manoj

0 richa mishra over 8 years ago in reply to Manoj Santha Mohan

Prodigy 100 points

hello Manoj,

I have enabled EALLOW

0 richa mishra over 8 years ago in reply to Richard Poley

Prodigy 100 points

This is the code. gpl[0] has the information of switching signal and is assigned to gpio 16. then by every delay() loop gpio pin assignment will toggle. Please suggest any modification or possible errors!!

GpioDataRegs.GPADAT.bit.GPIO16 = gpl[0];
delay();
//////////////
ch1[i] = il;
i++;
if(i==IMAX)
{
i = 0;
}

EALLOW;
SysCtrlRegs.WDKEY = 0xAA; // service WD #2
EDIS;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

GpioDataRegs.GPBCLEAR.bit.GPIO49 = 1;
}

//////////
void delay(void)
{
for(d1=0;d1<=2;d1++)
{
asm("NOP");
}
}