CCS/TMS320F28377S: Read Adc Results in CLA task

user3520562

Prodigy 30 points

Part Number: TMS320F28377S

Tool/software: Code Composer Studio

Dear All，

When I read adc results in CLA task，why all the returned variables always are 0 ？

As showed below AdcaResultRegs.ADCRESULT13 = 4095，but f32AdcResultA3S = 0.

#pragma DATA_SECTION(f32AdcResultA3S,"CLAData");
#pragma DATA_SECTION(f32AdcResultA4S,"CLAData");
#pragma DATA_SECTION(f32AdcResultA5S,"CLAData");
float32 f32AdcResultA3S = 0;
float32 f32AdcResultA4S = 0;
float32 f32AdcResultA5S = 0;

Cla1Share : origin = 0x00A000, length = 0x000A00

CLAData : > Cla1Share, PAGE=1

over 5 years ago

0 Lori Heustess over 5 years ago

TI__Guru* 92650 points

There are datatypes which have different sizes on the C28x and the CLA. This can lead to issues unless guidelines for sharing variables are followed.

Refer to these two FAQs:

You may also find the getting started with the CLA information within the CLA Software Development guide helpful:

https://software-dl.ti.com/C2000/docs/cla_software_dev_guide/getting_started.html

Regards

Lori

0 user3520562 over 5 years ago in reply to Lori Heustess

Prodigy 30 points

Thanks very much，it works well ！

My solution：

typedef union
{
volatile unsigned short *ptr; //Aligned to lower 16-bits
volatile unsigned int *pad; //32-bits
}CLA_FPTR;

typedef struct
{
CLA_FPTR a;
CLA_FPTR b;
CLA_FPTR c;
}f_THREE_PHASE_ADC;

C28：tGridVolADCount.a.pad = (volatile Uint16 *)&AdcaResultRegs.ADCRESULT13;

CLA：float32 temp = *(tGridVolADCount.a.ptr);

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CCS/TMS320F28377S: Read Adc Results in CLA task