PWM and Hercules RM42

Anthony Boulard

Prodigy 110 points

Other Parts Discussed in Thread: HALCOGEN

Hi everybody !

I'm trying to generate a PWM in order to make blink a LED.

On the Hercules RM42, this LED is connected to GIOA6_NHET[31] pin.

In HalCoGen, I have :

Enable HET drivers
Enable the PW0 on pin 31
Enable output direction for pin 31
Generate the code
Include the file in CCS

In CCS, I've placed the following code in the syst_main.c file (I've following the TI tutorial):

/* USER CODE BEGIN (1) */
#include "het.h"
/* USER CODE END */

void main(void)
{
/* USER CODE BEGIN (3) */

hetInit()
while(1);
/* USER CODE END */
}

I can activate the led with the gioSetBit function, but the LED doesn't blink...

What the problem ?!

Thanks,

Anthony

over 11 years ago

0 Sunil Oak over 11 years ago

TI__Mastermind 49120 points

Hi Anthony,

This is a known bug in the latest HALCoGen release and will be corrected in the next update. See this thread:

http://e2e.ti.com/support/microcontrollers/hercules/f/312/p/285398/996880.aspx#996880

Basically the NHET module is initialized to be in slave mode. You can correct this by setting the CMS (Clock Master / nSlave) bit in the NHET global control register (HETGCR).

Regards, Sunil

0 Anthony Boulard over 11 years ago in reply to Sunil Oak

Prodigy 110 points

Hi Sunil !

Thanks for your answer !

Where can I see the state of the GCR register ?

How can I change the value of this register ?

May i change it with this function :

void het1GetConfigValue(het_config_reg_t *config_reg, config_value_type_t type)

Regards, Anthony

0 Anthony Boulard over 11 years ago in reply to Anthony Boulard

Prodigy 110 points

In the het.c file generated by HalCoGen, the GCR register seems to be well configured :

void hetInit(void)

{

....

/** - Setup control register
* - Enable output buffers
* - Ignore software breakpoints
* - Master mode since only one HET is active
* - Enable HET
*/
hetREG1->GCR = 0x01030001U;

}

Isn't It ?

Regards

0 Sunil Oak over 11 years ago in reply to Anthony Boulard

TI__Mastermind 49120 points

Anthony,

Yes, it is configured to be in master mode. I will try this out today and get back to you.

Regards, Sunil

0 Sunil Oak over 11 years ago in reply to Sunil Oak

TI__Mastermind 49120 points

Anthony,

You also need to configure the "PINMUX" tab to select the HET[31] function to be output instead of the GIOA[6]. Once you do this, the PWM will be output on the pin.

Regards, Sunil

0 Anthony Boulard over 11 years ago in reply to Sunil Oak

Prodigy 110 points

Sunil,

Problem solved ! HET[31] was not configured as a output in the PINMUX ...

Thanks for your Help !!

Regards, Anthony

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PWM and Hercules RM42