TMS570LS1227: Use of AWM1_EXT_ENA

Hi Chuck,

Thank you very much for your quick support.

I will get back to you as soon as I get a feedback from my customer.

Thanks,
Needhu

Team,

After taking the question online to discuss further, I have a general follow up question. In bold is the question first asked by the customer and an answer from chuck.

Is it possible to have a Group with more than 32 Channels?We like to be compatible between the LS1227 and the LC4357
CWDEach ADC module has a total of 32 channels. In the case of the LS1227 only 24 are bonded out to a pin. In the case of the LC4357 you have the full 32 channels for ADC1 with 16 shared channels with ADC2 and an additional 9 ADC2 channels that are not shared (could be used for the 8 direct channels). If you have channels selected for conversion in the LS1227 that are not actually bonded, these channels will be floating and will have indeterminate values.

Could you please answer the follow up questions asked below.

• What I mean is that in Software it is only possibly to have 2 groups with 32 Channels. For the 1227 it would mean if we use 4:1 Multiplexer we could use 8 ADC Pins  AD1in[0-7] in one group.   Is it possible to have a bigger group? (Esspecially for the LC4357 using 8:1 or 16:1 multiplexer)

• i have a problem with the HET of  the  LC4357 Board.

   This is my program

   P02_Period   PCNT { hr_lr=HIGH,type=RISE2RISE,pin=2};

  ;P02_HighTime   PCNT { hr_lr=LOW,type=RISE2FALL,pin=2};

  P02_EventCount ECNT { pin=2,event=RISE,reg=A,data=0};

  P02_Branch     BR   { next=P02_Last,cond_addr=P02_PeriodSave ,pin=2,event=RISE};

  P02_PeriodSave   ADD { src1=REM,src2=ZERO,dest=IMM,remote=P02_Period,data=0};

  P02_DJZ        DJZ  { next=P02_Add,cond_addr=P02_Move,reg=A,data=8}; Anzahl Nocken zu zählen

  P02_Add   ADD { src1=REM,src2=IMM,dest=IMM,next=P02_Last,remote=P02_Period,data=0};

  P02_Move   ADD { src1=REM,src2=ZERO,dest=IMM,remote=P02_Add,data=0};Ergebnis hier speichern

  P02_ResetDJZ   MOV32 { remote=P02_DJZ,type=IMTOREG&REM,reg=A,data=8};

  P02_ResetSum   MOV32 { remote=P02_Add,type=IMTOREG&REM,reg=A,data=0};

  P02_Last       BR { next=P00_Period,cond_addr=P00_Period,event=NOCOND};

  P02_Period  works fine, if I do not use (comment out)  the P02_HighTime.

  If I use the P02_Hightime there seems to be an Problem with the HR Data.

  I don’t want to use HR Share, because I need the Pins.

  For me it is ok, to have the P02_Hightime only with Low Resolution.

   Where is my mistake

Thank you very much in advance.

-Needhu

Team,

This is an urgent question, Could I please have a feedback?

Thank you ,

-Needhu

Needhu,

Each group has up to 32 ADC channels that can be assigned to it. There are 3 groups EVENT Group, Group1 and Group2. The TMS570LS1227 has a total of 24 ADC channels and 2 AWD1_EXT_SEL pins bonded out in the ZWT package. Each time a conversion is initiated, the device will clock in the ADC count of the channels assigned to the specified group. If there are external muxes involved, the SW will need to configure the muxes according to the intended inputs to be converted.

So, in summary, a single group can have up to 24 channels associated with it in the LS1227 device and perform up to 24 conversions with a single instantiation of the ADC Group conversion. Through the use of the additional AWM1_EXT_SEL bits and external muxes, it is possible to extend the number of channels of the device, but each of the combinations of the AWM1_EXT_SEL bits would be effectively a new group of conversions since each would require a new conversion cycle. The same is true for the LS4357 except it has a total of 32 ADIN channels that can be chosen per group and 5 AWM1_EXT_SEL bits allowing further expansion of the number of combinations of channels (groups) that can be converted in a single ADC conversion trigger.

Please take the time to review the ADC chapter of the TRM. This is stated pretty clearly there.

In regard to the NHET question. Please post to a separate thread for tracking purposes and to make sure we can get the right resources looking at it. NHET programming is not a strong point for me.