TMS570LS3137: TMS570LS3137: HOW to generate 20 PWMs by HET IDE tool? Are there any examples?

Hi Lijian,

The IDE contains several examples for generating PWM: 1 channel, 3 channels and 4 channels. I don't have a ready example for 20 PWMs.

hello Mr. Wang

hello Mr. Wang

hello Mr. Wang

hello Mr. Wang

I know what you present. In practice, the memory contents generated by HET-IDE is not same with the  HALCOGEN. I mean the pwm0-pwm7. So I try to modify the het.c directly so as to get the 9th pwm according to the existing contents which are generated by HALCOGEN. I only modified the PWCNM, DJZ, MOV64(period update and duty cycle). After that the result is bad, and the pwm0-pwm7 not output, the 9th pwm is not, too. So i want to know how to modify the het.c directly. i think that is quickly compare with HET-IDE. i want to control many step motors, so the 20 pwms is a must in my project. thanks foy your help.

Hi Lijian,

Don't modify the HAlCOGen generated code manually. Please use the HET IDE to generate C code, and header file, then copy the IDE generated C code to NHET RAM.

Hi Mr.Wang,I'm sorry for not replying to you in the past period of time.As you told me, I used the HEt-IDE tool to generate a multi-channel PWM. Because of the use of this tool, in practice the HAL tool does not use the het.c file, but the related files generated by the HEt-IDE. This prevents me from using the pwmSetDuty function to change the PWM duty cycle. In fact, I tried using this function, but nothing worked. The initialized duty cycle does not change. Therefore, I would like to know how to adjust duty cycle in project after theHEt-IDE tool generates PWM waveform.

Thanks

 Lijian Wang

I

 I set 8-channel PWM with 50% duty cycle in THE HEt-IDE tool. When I tried to change the duty cycle in the program, as shown in the picture, I used the pwmSetDuty function, but it had no effect. The duty cycle did not change. Did I set the parameters wrong? Does the second argument to this function depend on the order in which the ET-IDE is set? Or can this function not be used in conjunction with the HET-IDE?

Hi Lijian,

Normally we use ECMP to generate PWM signal, and use MOV32 or MOV64 to update the duty cycle. Updating the duty cycle by changing the data field of ECMP directly will lead to a missing pulse. 

The HET IDE generates C file. You need to replace the default code (het1PROGRAM[]) generated by HALCOGen with the c file (HET_INIT0_PST[]) generated by HET IDE.

The code generated by HAlCoGen:

static const hetINSTRUCTION_t het1PROGRAM[58U] =
{

 .........

}

The code generated by HET IDE:

HET_MEMORY const HET_INIT0_PST[4] =
{

     ....

}

You need to copy HET_MEMORY const HET_INIT0_PST[4] to your project, and change the memcpy in het.c

change:

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

to:

    (void)memcpy((void *)hetRAM1, (const void *)HET_INIT0_PST, sizeof(HET_INIT0_PST));