TMS320F280049: Reading ADC values and changing PWM values in the CLA

Daniel Bernal Galeano

Part Number: TMS320F280049

Hello,

I'm following the examples "cla_ex1_adc_fir" and "cla_ex2_background_task" from the DriverLib f280049 folder in C2000 ware, but even without changing anything (but the Targetconfigs to debug the Launchpad f280049), the ADC values acquired are not consistent. The output value of the filter changes from 35 to -2048 erratically whether the pin ADCINA0 is connected to +3.3V or ground. However, it is possible to read successfully the ADC value from CPU1 using ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);

On the other hand, I haven´t been able to change epwm CMPA value from cla.

I've been trying to use SysCtl_setPeripheralAccessControl(SYSCTL_ACCESS_ADCA,SYSCTL_ACCESS_CLA1,SYSCTL_ACCESS_FULL ) to allow access for the cla to the peripheral but no success

I've added too #include "f28004x_cla_typedefs.h" to the cla file but no success.

Using assembler code for the cla is not an option.

What am I doing wrong? is there another example that successfully reads the ADC / changes CMPA from the cla?

I've spent many hours on a project that uses the CLA, and CPU1 with the DriverLib and this is the only part that doesn't work, I'd thank you very much if you can give me an advice

over 6 years ago

0 Haizhu Li over 6 years ago

Prodigy 140 points

I successfully use CLA to filter ADC value in F28379 and I suggest you change the code line 105 in "cla_ex2_background_task_cla.cla" to active the pass through mode, then you can check if the value CLA read is correct.

As I do not have 28049 device, this is only an advice. Maybe someone else can give a better answer.

0 Daniel Bernal Galeano over 6 years ago in reply to Haizhu Li

Prodigy 190 points

Hello Haizhu,

Thank you for your answer, I've assigned to filter_out the value in filter_in, i.e. the value in the ADC result register and it stays in -2048 whether I change the voltage in the ADC port or not, which i suppose may be a sign that the CLA isn't reading the right register or doesn't have access permission. I've tried this on another board that uses the F280049 and obtained similar results.

0 Daniel Bernal Galeano over 6 years ago in reply to Daniel Bernal Galeano

Prodigy 190 points

Ok, I partially solved it, I don't know why the preset register addresses in the header files don't work. During the debug session, I acceded the exact register where the adc result is stored, and used it:

filter_in=*(uint16_t*)(0xB00);

instead of

filter_in = AdcaResultRegs.ADCRESULT0;

0 Haizhu Li over 6 years ago in reply to Daniel Bernal Galeano

Prodigy 140 points

Maybe do a check on the link file, I guess.

0 Lori Heustess over 6 years ago in reply to Daniel Bernal Galeano

TI__Guru* 92130 points

Daniel Bernal Galeano said:
filter_in = AdcaResultRegs.ADCRESULT0;

The mapping of this register is done in the f28004x_headers_nonbios.cmd file. Make sure this is included in your project.

PAGE 1:    /* Data Memory */

   ADCA_RESULT   : origin = 0x000B00, length = 0x000020
   ADCB_RESULT   : origin = 0x000B20, length = 0x000020

.....


   AdcaResultFile        : > ADCA_RESULT,   PAGE = 1
   AdcbResultFile        : > ADCB_RESULT,   PAGE = 1

0 Lori Heustess over 6 years ago in reply to Lori Heustess

TI__Guru* 92130 points

Daniel,

Please let me know if this thread is resolved? If not, please provide information on what is not working. If you have a different, but related question, please use the "ask a related question" button.

Regards

Lori

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049: Reading ADC values and changing PWM values in the CLA