CCS/TMS320F28027: AdcNetBus and ADCDRV_1ch_Rlt2

Victor,
Can you give the source project name and path for the code in question?

Thanks,
Matthew

Hello Matt,

I was trying to understand the code from BOOSTXL-C2KLED 2p2z connections, say boost 1 (BLUE):

// Boost 1 connections
ADCDRV_1ch_Rlt1 = &AdcNetBus[1];
CNTL_2P2Z_Ref1 = &IrefNetBus1; // point to Iref1
CNTL_2P2Z_Fdbk1 = &AdcNetBus[1]; // point to Iout1
CNTL_2P2Z_Coef1 = &CNTL_2P2Z_CoefStruct1.b2; // point to first coeff of 1st loop
CNTL_2P2Z_Out1 = &UoutNetBus1; // point to 2P2Z Uout1
PWMDRV_2ch_UpCnt_Duty1A = &UoutNetBus1;

The feedback is coming from the current sense resistor voltage multiplied by the gain of the OPAmp to the ADC, IBLUE (ADCINA2) .
Say later on, still using BOOSTXL-C2KLED, I will make a boost conv with feedback coming from the voltage divider VBLUE (ADCINB1), of course my K will change accordingly.
But how do I redirect AdcNetBus to get the "new" feedback from IBLUE (ADCINA2) to VBLUE (ADCINB1)?

Victor,

Thanks, here goes:

The ADC Results get stored in long array AdcNetBus[16].  This is a linear store of the ADC Result Registers 0 -15.

Now, the channels that get sampled when the ADC triggers are defined starting at line 516 in LED_Boost_PC_Main.c as follows:

#define        Iout1R    AdcResult.ADCRESULT1        //Q12
#define        Iout2R    AdcResult.ADCRESULT2        //Q12
#define        Iout3R    AdcResult.ADCRESULT3        //Q12
#define        Vout1R    AdcResult.ADCRESULT9        //Q12
#define        Vout2R    AdcResult.ADCRESULT10       //Q12
#define        Vout3R    AdcResult.ADCRESULT11       //Q12
#define        VinR      AdcResult.ADCRESULT12       //Q12

    //
    // ADC Channel Selection
    //
    ChSel[0] = 2;        // Dummy read for first sample bug
    ChSel[1] = 2;        // A2 - Iout1 - blue
    ChSel[2] = 1;        // A1 - Iout2 - green
    ChSel[3] = 6;        // A6 - Iout3 - red
    ChSel[9] = 9;        // B1 - Vout1
    ChSel[10] = 10;      // B2 - Vout2
    ChSel[11] = 12;      // B3 - Vout3
    ChSel[12] = 14;      // B6 - Vin / Vout8

    //
    // ADC Trigger Selection
    //
    TrigSel[0] = 5;        // ePWM1, ADCSOCA
    TrigSel[1] = 5;        // ePWM1, ADCSOCA
    TrigSel[2] = 5;        // ePWM1, ADCSOCA
    TrigSel[3] = 5;        // ePWM1, ADCSOCA
    TrigSel[9] = 5;        // ePWM1, ADCSOCA
    TrigSel[10] = 5;       // ePWM1, ADCSOCA
    TrigSel[11] = 5;       // ePWM1, ADCSOCA
    TrigSel[12] = 5;       // ePWM1, ADCSOCA

    ADC_SOC_CNF(ChSel, TrigSel, ACQPS, 16, 0);

So as you pointed out Iout1R is coming from ADCINA2, Iout2R is from ADCINA1, and so on.  All ADC channels are sampled when SOCA trigger from ePWM1 happens.  So if you want to change the ADC channel that samples Iout1R, you would just need to change the channel number at ChSel[1].  

After the ADC completes its conversions, the ADC Results are loaded to AdcNetBus[16] in the DPL_ISR, which is in LED_Boost_PC_ISR.asm.  This uses an assembly macro in ADCDRV_1ch.asm to transfer the 12-bit result to a left justified 32-bit word(recall that AdcNetBus[16] was defined as a long), such that the ADC Result is in Q24 format.

I believe that the array AdcNetBus[16] holds each result from the ADC, even if they are unused(i.e. 0, 4-8, and 13-15).

Let me know if this answers the question.

Best,

Matthew

Hello Matthew,

Thanks for the answer. I just thought so too, changing and redirecting by ChSel[x].

I did the same when I convert the firmware for TMDSRGBLEDKIT firmware but still using BOOSTXL-C2KLED hardware as I asked in the link below.
As I thought the software is modifiable and able to adapt on a certain hardware.

e2e.ti.com/.../2483841

I was trying to use the firmware of TMDSRGBLEDKIT

C:\ti\controlSUITE\development_kits\Multi-DCDC-Color-LED-Kit_v1.0\LED-ColorMix_v1_0

on my BOOSTXL-C2KLED.

Open loop is working and can light the GREEN or RED LED but when I close the loop, I cannot seem to lit GREEN led. BTW, the BLUE LED seems to be spoilt already.

BOOSTXL-C2KLED is using these ADC channels (/LED_Boost_PC/LED_Boost_PC_Main.c):

// ADC Channel Selection
ChSel[0] = 2; // Dummy read for first sample bug
ChSel[1] = 2; // A2 - Iout1 - blue
ChSel[2] = 1; // A1 - Iout2 - green
ChSel[3] = 6; // A6 - Iout3 - red
ChSel[9] = 9; // B1 - Vout1
ChSel[10] = 10; // B2 - Vout2
ChSel[11] = 12; // B3 - Vout3
ChSel[12] = 14; // B6 - Vin / Vout8

while TMDSRGBLEDKIT are using these (/TMDSRGBLEDKIT-LED-ColorMix/LED-ColorMix-Main.c):

// ADC Channel Selection
ChSel[0] = 2; // Dummy read for first sample bug
ChSel[1] = 2; // A2 - Iout1
ChSel[2] = 0; // A0 - Iout2
ChSel[3] = 4; // A4 - Iout3
ChSel[4] = 1; // A1 - Iout4
ChSel[5] = 6; // A6 - Iout5
ChSel[6] = 3; // A3 - Iout6
ChSel[7] = 14; // B6 - Iout7
ChSel[8] = 7; // A7 - Iout8
ChSel[9] = 9; // B1 - Vout1
ChSel[10] = 10; // B2 - Vout2
ChSel[11] = 11; // B3 - Vout3
ChSel[12] = 12; // B4 - Vin / Vout8

few questions:
1. why is B3 on both firmware different? 11 vs 12
2. can I swap ADC channels? since the GREEN on BOOSTXL-C2KLED is using A1 while in TMDSRGBLEDKIT A1 is used for Iout4. It seems to work on RED LED but not on GREEN.

Here are the modifications I did:

// ADC Channel Selection
ChSel[0] = 2; // Dummy read for first sample bug
ChSel[1] = 2; // A2 - Iout1
ChSel[2] = 1; // A0 - Iout2 , orig "0".
ChSel[3] = 6; // A4 - Iout3, orig "4".
ChSel[4] = 1; // A1 - Iout4, can double?
ChSel[5] = 6; // A6 - Iout5, can double?
ChSel[6] = 3; // A3 - Iout6
ChSel[7] = 14; // B6 - Iout7
ChSel[8] = 7; // A7 - Iout8
ChSel[9] = 9; // B1 - Vout1
ChSel[10] = 10; // B2 - Vout2
ChSel[11] = 11; // B3 - Vout3
ChSel[12] = 12; // B4 - Vin / Vout8

I am modifying Gui_Iset2 & Gui_Iset3 during debug to change the light intensity. Only RED LED can be controlled (Gui_Iset3) but not GREEN (Gui_Iset2).

Then I finally set like this:

// ADC Channel Selection
ChSel[0] = 2; // Dummy read for first sample bug
ChSel[1] = 2; // A2 - Iout1
ChSel[2] = 1; // A0 - Iout2, orig "0".
ChSel[3] = 6; // A4 - Iout3, orig "4".
ChSel[4] = 0; // A1 - Iout4, orig "1".
ChSel[5] = 4; // A6 - Iout5, orig "6".
ChSel[6] = 3; // A3 - Iout6
ChSel[7] = 14; // B6 - Iout7
ChSel[8] = 7; // A7 - Iout8
ChSel[9] = 9; // B1 - Vout1
ChSel[10] = 10; // B2 - Vout2
ChSel[11] = 12; // B3 - Vout3, orig "11".
ChSel[12] = 14; // B6 - Vin / Vout8, orig "12".

still same effect. Also I cannot set to off the RED LED once I have already set it. Meaning it cannot turn off anymore if I set Gui_Iset3 = 0.

Hello Matthew,

I still have the same problems and I have modified as follows:

#define	Iout1R	AdcResult.ADCRESULT1	//Q12
#define	Iout2R	AdcResult.ADCRESULT2	//Q12
#define	Iout3R	AdcResult.ADCRESULT3	//Q12
/*
#define	Iout4R	AdcResult.ADCRESULT4	//Q12
#define	Iout5R	AdcResult.ADCRESULT5	//Q12
#define	Iout6R	AdcResult.ADCRESULT6	//Q12
#define	Iout7R AdcResult.ADCRESULT7	//Q12
#define	Iout8R AdcResult.ADCRESULT8	//Q12
*/
#define	Vout1R	AdcResult.ADCRESULT9	//Q12
#define	Vout2R	AdcResult.ADCRESULT10	//Q12
#define	Vout3R	AdcResult.ADCRESULT11	//Q12
#define	Vout8R	AdcResult.ADCRESULT12	//Q12
#define	VinR	AdcResult.ADCRESULT12	//Q12

// ADC Channel Selection
ChSel[0] = 2; // Dummy read for first sample bug
ChSel[1] = 2; // A2 - Iout1
ChSel[2] = 1; // A1 - Iout2
ChSel[3] = 6; // A6 - Iout3
/*
ChSel[4] = 1; // A1 - Iout4
ChSel[5] = 6; // A6 - Iout5
ChSel[6] = 3; // A3 - Iout6
ChSel[7] = 14; // B6 - Iout7
ChSel[8] = 7; // A7 - Iout8
*/
ChSel[9] = 9; // B1 - Vout1
ChSel[10] = 10; // B2 - Vout2
ChSel[11] = 12; // B4 - Vout3
ChSel[12] = 14; // B6 - Vin / Vout8

// ADC Trigger Selection
TrigSel[0] = 5;	// ePWM1, ADCSOCA
TrigSel[1] = 5;	// ePWM1, ADCSOCA
TrigSel[2] = 5;	// ePWM1, ADCSOCA
TrigSel[3] = 5;	// ePWM1, ADCSOCA
/*
TrigSel[4] = 0;	// ePWM1, ADCSOCA
TrigSel[5] = 0;	// ePWM1, ADCSOCA
TrigSel[6] = 0;	// ePWM1, ADCSOCA
TrigSel[7] = 0;	// ePWM1, ADCSOCA
TrigSel[8] = 0;	// ePWM1, ADCSOCA
*/
TrigSel[9] = 5;	// ePWM1, ADCSOCA
TrigSel[10] = 5;	// ePWM1, ADCSOCA
TrigSel[11] = 5;	// ePWM1, ADCSOCA
TrigSel[12] = 5;	// ePWM1, ADCSOCA

Anywhere else I need to check?

I have now fixed the BLUE LED. U6 got no output.
Since the connections of the BLUE LEDs are same for both hardware, I thought the BLUE led will light.
Still same problem.

Victor,
Let's try something simple just to verify the connects are all good. After you load the code, just run it to at least past the setup phase and halt it. Now I'd like to use the register window to look at the GPIOA regs:

1)I want to make the MUX selection for GPIO0/1/2 all 0. This will take control away from the PWM and give it back to the GPIO
2)Then modify the corresponding bits in the GPIOADIR register to a "1". This will place the pin in output mode.
3)Now, using the GPIOADAT register, write a "1" to the GPIO0/1/2 bits. If the value is a "1" you should see the blue/green/red light up respectively. If a "0" they should be off.

Again I want to make sure the physical connection is good before we debug the control code.

Let me know how this goes.

Best regards,
Matthew

Hello Matthew,

Sorry for the late reply, been busy for a while.
If i make the GPIO0-2 to be constant 1, the FET will be turned on for a long time and the V+ would be shorted to GND via the inductor and might spoil the FET.

Anyway, before I make the experiment, I would always debug and run the original code to verify my setup (physical connections).

Victor.

Victor,
Can you attach or inline the PWM portions of the code, both the GPIO setup and the main PWM setup? I feel good about the ADC sampling at this point, so let's check the other side of the equation and look at how we are stimulating the FETs.

Best,
Matthew

Hello Matthew,

I checked with a USB Scope (mine has a limited BW up to only 6MBPS).

LED BOOST BOOSTXL-C2KLED is only swithing at 50kHz while MULTI LED TMDSRGBLEDKIT is shwithing at around 400kHZ.

here are the registers at open loop:

LED BOOST BOOSTXL-C2KLED
GRP( ePWM1 )
TBCTL Unsigned / Readable,Writeable 0x001A
TBSTS Unsigned / Readable,Writeable 0x0001
TBPHS Unsigned / Readable,Writeable 0x00000000
TBCTR Unsigned / Readable,Writeable 0x0068
TBPRD Unsigned / Readable,Writeable 0x0258
TBPRDHR Unsigned / Readable,Writeable 0x0000
CMPCTL Unsigned / Readable,Writeable 0x0300
CMPA Unsigned / Readable,Writeable 0x00000000
CMPB Unsigned / Readable,Writeable 0x021D
AQCTLA Unsigned / Readable,Writeable 0x0090
AQCTLB Unsigned / Readable,Writeable 0x0600
AQSFRC Unsigned / Readable,Writeable 0x0000
AQCSFRC Unsigned / Readable,Writeable 0x0000
DBCTL Unsigned / Readable,Writeable 0x0000
DBRED Unsigned / Readable,Writeable 0x0000
DBFED Unsigned / Readable,Writeable 0x0000
TZSEL Unsigned / Readable,Writeable 0x0000
TZDCSEL Unsigned / Readable,Writeable 0x0000
TZCTL Unsigned / Readable,Writeable 0x0000
TZEINT Unsigned / Readable,Writeable 0x0000
TZFLG Unsigned / Readable,Writeable 0x0000
TZCLR Unsigned / Readable,Writeable 0x0000
TZFRC Unsigned / Readable,Writeable 0x0000
ETSEL Unsigned / Readable,Writeable 0x0A0A
ETPS Unsigned / Readable,Writeable 0x0303
ETFLG Unsigned / Readable,Writeable 0x0004
ETCLR Unsigned / Readable,Writeable 0x0000
ETFRC Unsigned / Readable,Writeable 0x0000
PCCTL Unsigned / Readable,Writeable 0x0000
HRCNFG Unsigned / Readable,Writeable 0x0000
HRPWR Unsigned / Readable,Writeable 0x0000
HRMSTEP Unsigned / Readable,Writeable 0x0000
HRPCTL Unsigned / Readable,Writeable 0x0000
TBPRDM Unsigned / Readable,Writeable 0x02580000
CMPAM Unsigned / Readable,Writeable 0x00000000
DCTRIPSEL Unsigned / Readable,Writeable 0x0000
DCACTL Unsigned / Readable,Writeable 0x0000
DCBCTL Unsigned / Readable,Writeable 0x0000
DCFCTL Unsigned / Readable,Writeable 0x0000
DCCAPCTL Unsigned / Readable,Writeable 0x0000
DCFOFFSET Unsigned / Readable,Writeable 0x0000
DCFOFFSETCNT Unsigned / Readable,Writeable 0x0000
DCFWINDOW Unsigned / Readable,Writeable 0x0000
DCFWINDOWCNT Unsigned / Readable,Writeable 0x0000
DCCAP Unsigned / Readable,Writeable 0x0000

MULTI LED TMDSRGBLEDKIT
GRP( ePWM1 )
TBCTL Unsigned / Readable,Writeable 0x0018
TBSTS Unsigned / Readable,Writeable 0x0001
TBPHS Unsigned / Readable,Writeable 0x00000000
TBCTR Unsigned / Readable,Writeable 0x000D
TBPRD Unsigned / Readable,Writeable 0x0095
TBPRDHR Unsigned / Readable,Writeable 0x0000
CMPCTL Unsigned / Readable,Writeable 0x0005
CMPA Unsigned / Readable,Writeable 0x00000000
CMPB Unsigned / Readable,Writeable 0x000E
AQCTLA Unsigned / Readable,Writeable 0x0012
AQCTLB Unsigned / Readable,Writeable 0x0102
AQSFRC Unsigned / Readable,Writeable 0x0000
AQCSFRC Unsigned / Readable,Writeable 0x0000
DBCTL Unsigned / Readable,Writeable 0x0000
DBRED Unsigned / Readable,Writeable 0x0000
DBFED Unsigned / Readable,Writeable 0x0000
TZSEL Unsigned / Readable,Writeable 0x0000
TZDCSEL Unsigned / Readable,Writeable 0x0000
TZCTL Unsigned / Readable,Writeable 0x0000
TZEINT Unsigned / Readable,Writeable 0x0000
TZFLG Unsigned / Readable,Writeable 0x0000
TZCLR Unsigned / Readable,Writeable 0x0000
TZFRC Unsigned / Readable,Writeable 0x0000
ETSEL Unsigned / Readable,Writeable 0x090A
ETPS Unsigned / Readable,Writeable 0x0707
ETFLG Unsigned / Readable,Writeable 0x0005
ETCLR Unsigned / Readable,Writeable 0x0000
ETFRC Unsigned / Readable,Writeable 0x0000
PCCTL Unsigned / Readable,Writeable 0x0000
HRCNFG Unsigned / Readable,Writeable 0x0000
HRPWR Unsigned / Readable,Writeable 0x0000
HRMSTEP Unsigned / Readable,Writeable 0x0000
HRPCTL Unsigned / Readable,Writeable 0x0000
TBPRDM Unsigned / Readable,Writeable 0x00950000
CMPAM Unsigned / Readable,Writeable 0x00000000
DCTRIPSEL Unsigned / Readable,Writeable 0x0000
DCACTL Unsigned / Readable,Writeable 0x0000
DCBCTL Unsigned / Readable,Writeable 0x0000
DCFCTL Unsigned / Readable,Writeable 0x0000
DCCAPCTL Unsigned / Readable,Writeable 0x0000
DCFOFFSET Unsigned / Readable,Writeable 0x0000
DCFOFFSETCNT Unsigned / Readable,Writeable 0x0000
DCFWINDOW Unsigned / Readable,Writeable 0x0000
DCFWINDOWCNT Unsigned / Readable,Writeable 0x0000
DCCAP Unsigned / Readable,Writeable 0x0000

Hello,

For TMDSRGBLEDKIT

#define prd 150 // 150 Period count = 400 KHz @ 60 MHz
ADC_SOC_CNF(ChSel, TrigSel, ACQPS, 16, 0);
PWM_2ch_UpCnt_CNF(1, prd, 1, 0);
PWM_2ch_UpCnt_CNF(2, prd, 0, 2);
PWM_2ch_UpCnt_CNF(3, prd, 0, 2);
PWM_2ch_UpCnt_CNF(4, prd, 0, 2);

For BOOSTXL-C2KLED

#define prd 1200 // 1200 Period count = 50 KHz @ 60 MHz
ADC_SOC_CNF(ChSel, TrigSel, ACQPS, 16, 0);
PWM_DualUpDwnCnt_CNF(1, prd, 1, 0);
PWM_DualUpDwnCnt_CNF(2, prd, 0, 400);
PWM_1ch_UpDwnCnt_CNF(3, prd, 0, 400);

Victor,
Sorry for the lapse in response. I still think there may be multiple threads on this topic, with different TI factory folks responding. Can you let me know where things are wrt to the above so I can make sure to not duplicate answers?

Best regards,
Matt

Hello Matthew,

There is a reply already... e2e.ti.com/.../2524668
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