CCS/TMS570LC4357: Accessing N2HET as GIO

Timothy Canham

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

I see from the datasheet and HalCoGen that you can use the N2HHET ports as GIOs. We would like to set them to outputs that we can toggle from software.

First issue:

I changed all the N2HET1 bits to be digital outputs in HalCoGen. The HCG project file changed, but none of the generated source. Shouldn't it have changed?

Is there a software API that HCG generates that lets the software toggle the value, or do we have to write directly to the registers?

over 8 years ago

0 Anthony F. Seely over 8 years ago

TI__Guru 68920 points

Timothy,

The GPIO APIs will let you manipulate the GIO registers of the other peripherals w. embedded GPIO.
If you look at the .h file for the HET there should be a separate base address for GPIO that you can pass as a handle to the GPIO apis to set and clear the pin for example.

HET is different in that you never have functional mode versus GIO mode - there is no function register for HET pins.

Assuming you enable the output then either HET or CPU control the pin state (set/clear) and it's shared. Last to update 'wins'.
So make sure you don't have a HET program that is toggling the same pins you want to control through software loaded and running on HET or you'll go a little crazy figuring out what is going on.

0 Timothy Canham over 8 years ago in reply to Anthony F. Seely

Intellectual 440 points

So, from HL_reg_het.h, it would be: #define hetPORT1 ((gioPORT_t *)0xFFF7B84CU)?

0 QJ Wang over 8 years ago in reply to Timothy Canham

TI__Guru**** 196286 points

Hello Timothy,

You are right, so you can use NHET pins as regular GIO pins. For example:

gioSetDirection(hetPORT1, 0xFFFFFFFF);
gioSetPort(hetPORT1, 0x00000001);
gioGetPort(hetPORT1);

0 Timothy Canham over 8 years ago in reply to QJ Wang

Intellectual 440 points

Thanks. The only uncertainty in my mind is that I changed all the HET channels to outputs and based on Git, non of the HalCoGen generated source changed. Is this expected with the default?

0 QJ Wang over 8 years ago in reply to Timothy Canham

TI__Guru**** 196286 points

If you don't want to use NHET for PWM/capture etc, please make sure that those features are not enabled or selected in HALCoGen, and don't copy the NHET microcode (opcode and data) into NHET RAM (in hetInit()):

//(void)memcpy((void *)hetRAM1, (const void *)het1PROGRAM, sizeof(het1PROGRAM));

0 Anthony F. Seely over 8 years ago in reply to QJ Wang

TI__Guru 68920 points

Maybe you didn't generate the code again after making changes in the GUI.

The GUI just changes the configuration but it won't show up in '"C" code till you run the generation step which has to be done from the menu.

0 Timothy Canham over 8 years ago in reply to Anthony F. Seely

Intellectual 440 points

I actually did regenerate, twice to make sure, which is why I'm not sure why it didn't change. The files were regenerated, they just didn't show any differences.

0 Anthony F. Seely over 8 years ago in reply to Timothy Canham

TI__Guru 68920 points

Strange. Does the MMR register value match what you have in the GUI?

0 Timothy Canham over 8 years ago in reply to Anthony F. Seely

Intellectual 440 points

I'm not sure what the MMR register is, but I changed HET pin input/output values back and forth in HalCoGen, and although the source/headers were written, there weren't any changes. This seems like a HalCoGen bug. I'll have to manually set the direction as suggested in the earlier post.

0 QJ Wang over 8 years ago in reply to Timothy Canham

TI__Guru**** 196286 points

Hello Timothy,

After you modify the configuration, save project first , then generate code. In hl_het.c, the last line of hetREG1_DIR is for HET[0], and the 1st line is for HET[31].

This is code generated from my HALCoGen (HET[7:0] were configured as output):

0 Timothy Canham over 8 years ago in reply to QJ Wang

Intellectual 440 points

I tried changing one output back to an input to test it, then diff'ed the files. I see the project file change:

@@ -8427,7 +8427,7 @@ DRIVER.HET.VAR.HET1_BIT31_PULL.VALUE=1
DRIVER.HET.VAR.HET1_BIT29_DIR.VALUE=0x00000000
DRIVER.HET.VAR.HET1_BIT23_PULL.VALUE=1
DRIVER.HET.VAR.HET1_BIT15_PULL.VALUE=1
-DRIVER.HET.VAR.HET1_BIT0_DIR.VALUE=0x00000001
+DRIVER.HET.VAR.HET1_BIT0_DIR.VALUE=0x00000000
DRIVER.HET.VAR.HET2_CAP2_POLARITY.VALUE=0
DRIVER.HET.VAR.HET2_PWM7_DUTY.VALUE=50
DRIVER.HET.VAR.HET2_BIT6_XORSHARE.VALUE=0x00000000

But no generated source. I searched for "hetREG1->DIR" in the generated code, and it doesn't show up anywhere.

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CCS/TMS570LC4357: Accessing N2HET as GIO