CCS/TMS320F28377D: C2000ware: DeviceSupport - "F2837xD_SysCtrl.c" - "InitSysCtrl"

jawe477

Intellectual 690 points

Part Number: TMS320F28377D
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Hello everybody,

I found in the C2000ware examples (device_support), in the file "F2837xD_SysCtrl.c" the function "InitSysCtrl".

I don't understand the passage "Check if device is trimmed":

    CpuSysRegs.PCLKCR13.bit.ADC_A = 1;
    CpuSysRegs.PCLKCR13.bit.ADC_B = 1;
    CpuSysRegs.PCLKCR13.bit.ADC_C = 1;
    CpuSysRegs.PCLKCR13.bit.ADC_D = 1;
    //
    // Check if device is trimmed
    //
    if(*((Uint16 *)0x5D1B6) == 0x0000){
        //
        // Device is not trimmed--apply static calibration values
        //
        AnalogSubsysRegs.ANAREFTRIMA.all = 31709;
        AnalogSubsysRegs.ANAREFTRIMB.all = 31709;
        AnalogSubsysRegs.ANAREFTRIMC.all = 31709;
        AnalogSubsysRegs.ANAREFTRIMD.all = 31709;
    }
    CpuSysRegs.PCLKCR13.bit.ADC_A = 0;
    CpuSysRegs.PCLKCR13.bit.ADC_B = 0;
    CpuSysRegs.PCLKCR13.bit.ADC_C = 0;
    CpuSysRegs.PCLKCR13.bit.ADC_D = 0;

1) Is the adress 0x5D1B6 correct?

The "ANALOG_SUBSYS" base adress is 0x5D180. So the offset is 0x5D1B6-0x5D180 = 0x36 .

I think this is the ADCEVTINTSEL register.

2) Why can I conclude, that the Device is not trimmed, when the ADCOFFTRIM Register is 0x0000 ?

3) Why writing the Value "31709" to the trim registers?

4) Why is this passage not part of the ADC-init ?

Thanks in advance,

Jan

over 5 years ago

0 Santosh Jha over 5 years ago

TI__Guru 50611 points

Hi Jan,

jawe477 said:

1) Is the adress 0x5D1B6 correct?

The "ANALOG_SUBSYS" base adress is 0x5D180. So the offset is 0x5D1B6-0x5D180 = 0x36 .

I think this is the ADCEVTINTSEL register.

Please refer to TRM, section 10.2.2.5. The offset 0x36 is for ANAREFTRIMA Register

jawe477 said:
2) Why can I conclude, that the Device is not trimmed, when the ADCOFFTRIM Register is 0x0000 ?

Please refer to the same section of TRM. 0x0000 is untrimmed value.

0 jawe477 over 5 years ago in reply to Santosh Jha

Intellectual 690 points

Hello Santosh,

I'm sorry, I was on the wrong track.

I looked at the adresses of the ADC-regs and not of the regs of the analog subsystems.

Thank you for your help and patience.

Can you tell me, why in the example an value of "31709" is written to the REF trim registers?

Regards,

Jan

0 Santosh Jha over 5 years ago in reply to jawe477

TI__Guru 50611 points

Hi Jan,

jawe477 said:
Can you tell me, why in the example an value of "31709" is written to the REF trim registers?

For F2837xD_sysCtrl.c, the default trim value is 0x7BDD.

All the parts have factory calibration values, so the flow should not go to that section. This is a fail safe code, that if there is no trim values, then it have some default calibration for optimum performance of ADC.

0 jawe477 over 5 years ago in reply to Santosh Jha

Intellectual 690 points

Hello Santosh,

thank you very much !

Regards,

Jan

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CCS/TMS320F28377D: C2000ware: DeviceSupport - "F2837xD_SysCtrl.c" - "InitSysCtrl"