Using NHET without alternative functions as GIO

Robert Thorin

Other Parts Discussed in Thread: TMS570LC4357, HALCOGEN, TMS570LS3137

I have been trying to implement a function that sets NHET pins as GIO outputs and are having difficulties setting the ones that do no have alternate functions.

I am using a TMS570LC4357 and for example I am trying to set N2HET2[23] to have a high output. Is there any special settings that have to be made to get these N2HET pins work as GIO outputs? Sorry for terrible syntax btw.

/* portReg is mapped to the corresponding control register and are setting the right pins */

// Set pull up or down or nothing.
if (pin->config & PORT_PULL_NONE) {
portReg->PULDIS |= mask;
}else {
portReg->PULDIS &= ~mask;

if (pin->config & PORT_PULL_UP) {
portReg->PSL |= mask;

} else {
portReg->PSL &= ~mask;
}
}

if (pin->config & PORT_DIR_OUT) {
portReg->DIR |= mask;

if(pin->config & PORT_PIN_LEVEL_HIGH){
portReg->DOUT |= mask;
}

if (pin->config & PORT_ODE_ENABLE) {
portReg->PDR |= mask;
} else {
portReg->PDR &= ~mask;
}

}

over 9 years ago

0 Chuck Davenport over 9 years ago

TI__Guru 59540 points

Hi Robert,

Can you have a look at these posts to see if they are any help to you.

e2e.ti.com/.../497641

e2e.ti.com/.../1087896

e2e.ti.com/.../1590824

0 Robert Thorin over 9 years ago in reply to Chuck Davenport

Prodigy 40 points

Hey! I have checked into the links and they confirm the way I am using to set the registers (verified from the HALCoGEN drivers/software).

I can see that the registers are correctly set and every N2HET2 except the ones without alternate functions (N2HET2[17], N2HET2[21], N2HET2[23]) outputs a signal on the pins. Is there another control register for these pad/pins to make it work?

0 Chuck Davenport over 9 years ago in reply to Robert Thorin

TI__Guru 59540 points

Hello Robert,

Can you zip up your project and post it to this thread so we can have a closer look at it?

0 Chuck Davenport over 9 years ago in reply to Chuck Davenport

TI__Guru 59540 points

Hello Robert,

As an additional point of information, what board are you using for your development? Are you using the HDK, the Launchpad, or a custom/proprietary board?

0 Robert Thorin over 9 years ago in reply to Chuck Davenport

Prodigy 40 points

rather not post my entire project online, but I am using the HDK. As I've mentioned earlier, everything is the registers are set correctly but there is still no output on the NHET pins that lack alternate functions.

0 Robert Thorin over 9 years ago in reply to Robert Thorin

Prodigy 40 points

Just realised that there are some differences in the data sheets.

for example:
N2HET2[17] does not have an output on the Hercules board (should be M4 according to www.ti.com/.../spnu597.pdf)

the Pin M4 on the board is actually connected to the EMIFDATA[9] (www.ti.com/.../tms570lc4357.pdf)
EMIFDATA[9] is connected to Pin M5 in www.ti.com/.../spnu597.pdf.

This might be the problem I've had all along.

0 Chuck Davenport over 9 years ago in reply to Robert Thorin

TI__Guru 59540 points

Hello Robert,

My apologies for the inconvenience, but I think this is the problem that you are having. I am not 100% familiar with the issue, but, from what I have had explained to me is that the pin for EMIFDATA[9] is mislabeled as the wrong device pin in the silkscreen on the board.

As a high level explanation the functional pins N2HET2[17], N2HET2[21], and N2HET2[23] are not brought to a connector on the board. This HDK schematic and board design was originally designed for one of the first devices in the Hercules family (TMS570LS3137) and was reused for the TMS570LC4357 HDK. The LS3137 does not have these functional pins and the balls on the package are listed as NC. Thus, there was no provision for them in the LC4357 HDK.

Based on your other pins providing the output signals you intend, I suspect you have implemented the GIO interface to the NHET pins correctly.

Again, my apologies for the inconvenience this might cause.

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Using NHET without alternative functions as GIO