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TMS320F28379D: Real-time ADC data drown by CCS graph has wrong value.

Miles Chun
Prodigy 140 points
Part Number: TMS320F28379D

Hello. 

I found a error while using graph tool in CCS to see the data from SDFM adc result data in real-time. 

This is the graph shows in ccs in real-time. it seems like some shifting happen periodically. 

When I deacivate the "continuous refresh" button, then it shows like this. 

So it seems like this error happens only in continuous refresh condition. 

What is the cause of this problem, and Is there any solutions to solve this problem? 

Thank you. 

Best regards.

  • 0
    TI__Mastermind 30185 points

    Hello Miles,

    Can you export the ADC results so I can take a look? You can do this while debugging by going to Tool → Save Memory and then follow the dialog prompts to save all the data at a given memory location. (If you are not already doing so, save the ADC data in an array that can be viewed in memory so we can see if there are any artifacts in the saved signal).

    Best regards,

    Omer Amir

  • 0 in reply to Omer Amir
    Prodigy 140 points

    Thank you for the reply.

    Here is the data from memory browser. 

    0x00010000	filter1Result
0x00010000	F78F	F919	0D75	0C11	0A9E	0916	0785	05EC	044B	029D	00E8	FF33	FD87
0x0001000D	FBE8	FA53	F8C2	F739	F5C6	F463	F30F	F1D3	F0B2	EFAB	EEC4	EDF9	ED4C
0x0001001A	ECBD	EC53	EC07	EBD4	EBD1	EC04	EC4D	ECB4	ED3D	EDE8	EEB0	EF98	F09B
0x00010027	F1B8	F2F1	F442	F5A5	F715	F899	FA2A	FBC1	FD5D	FF07	00BB	026E	041D
0x00010034	05BD	0755	08E7	0A70	0BE5	0D4A	0EA1	0FE1	1106	120F	12F9	13C5	1475
0x00010041	1505	1571	15BF	15F6	15FD	15CD	1587	1525	149F	13F6	132F	124C	114A
0x0001004E	102B	0EF1	0D9D	0C3A	0AC8	0942	07AF	0619	047A	02CF	011A	FF66	FDB8
0x0001005B	FC1A	FA82	F8EC	F763	F5F0	F489	F334	F1F4	F0D1	EFCA	EEDC	EE0F	ED5F
0x00010068	ECCC	EC5E	EC10	EBD7	EBCC	EBFD	EC45	ECA7	ED2E	EDD3	EE97	EF7A	F07A
0x00010075	F196	F2CB	F41A	F57C	F6EA	F86B	F9FC	FB91	FD2C	FED6	0089	023D	03EA
0x00010082	058E	0727	08BA	0A45	0BBC	0D24	0E7E	0FBF	10E6	11F1	12E1	13B1	1463
0x0001008F	14F7	1567	15B8	15EF	15FF	15D3	1590	1532	14B0	140A	1346	1266	1169
0x0001009C	104E	0F17	0DC4	0C62	0AF3	0970	07DD	0646	04A8	02FF	0149	FF93	FDE6
0x000100A9	FC45	FAAD	F91A	F790	F619	F4B0	F357	F216	F0F1	EFE5	EEF6	EE24	ED6F
0x000100B6	ECDA	EC68	EC17	EBDE	EBCB	EBF6	EC3A	EC99	ED1C	EDC0	EE81	EF5E	F05C
0x000100C3	F175	F2A7	F3F3	F554	F6C1	F840	F9D0	FB65	FCFF	FEA7	0059	020D	03BE
0x000100D0	0561	06F9	088E	0A1A	0B94	0CFD	0E58	0F9D	10C6	11D5	12C7	139B	1451
0x000100DD	14E8	155B	15AE	15EA	1602	15DB	1598	153E	14C0	141E	135F	1283	1187
0x000100EA	106F	0F3B	0DEC	0C8E	0B1E	099D	080C	0675	04D7	032F	017C	FFC6	FE16
0x000100F7	FC74	FADB	F948	F7BC	F643	F4D9	F37E	F23C	F112	F004	EF10	EE3B	ED84
0x00010104	ECEA	EC74	EC20	EBE3	EBCB	EBF0	EC32	EC8E	ED0C	EDAD	EE6C	EF46	F040
0x00010111	F157	F285	F3CE	F52C	F698	F815	F9A1	FB36	FCD3	FE78	0027	01DC	038E
0x0001011E	0533	06CC	085F	09EE	0B6B	0CD3	0E32	0F7B	10A6	11B9	12AE	1384	143E
0x0001012B	14D9	1551	15A8	15E7	1604	15E1	15A2	154B	14D0	1432	1377	129D	11A5
0x00010138	1091	0F61	0E15	0CB6	0B4A	09C9	083A	06A4	0508	0361	01AE	FFF8	FE47
0x00010145	FCA3	FB0A	F976	F7E8	F66A	F501	F3A5	F25E	F132	F01E	EF2A	EE51	ED98
0x00010152	ECFA	EC80	EC28	EBE8	EBC8	EBEA	EC2A	EC82	ECFE	ED9B	EE55	EF2D	F022
0x0001015F	F134	F262	F3A9	F506	F66F	F7EA	F977	FB0C	FCA5	FE47	FFF9	01AE	0361
0x0001016C	0507	06A1	0834	09C3	0B44	0CAE	0E0C	0F5A	1089	119D	1294	136E	142B
0x00010179	14C9	1546	15A1	15E2	1604	15E9	15AB	1555	14DF	1445	138C	12B6	11C3
0x00010186	10B1	0F84	0E3A	0CDB	0B70	09F4	0865	06D0	0536	0391	01DF	0027	FE76
0x00010193	FCD0	FB36	F9A0	F811	F693	F52A	F3CC	F280	F150	F03C	EF44	EE69	EDAB
0x000101A0	ED0B	EC8C	EC30	EBF0	EBCA	EBE3	EC20	EC76	ECEB	ED86	EE3D	EF12	F005
0x000101AD	F115	F23E	F382	F4DC	F645	F7BC	F948	FADD	FC74	FE16	FFC6	017A	032C
0x000101BA	04D4	0670	0806	0995	0B16	0C84	0DE5	0F35	1067	117E	127B	1357	1417
0x000101C7	14B9	1538	1596	15DA	1602	15EC	15B2	1560	14ED	1457	13A3	12D0	11DD
0x000101D4	10CF	0FA6	0E61	0D05	0B9B	0A21	0895	0700	0565	03C0	020E	0059	FEA7
0x000101E1	FD00	FB66	F9D1	F841	F6BF	F552	F3F2	F2A4	F172	F058	EF5C	EE7F	EDBE
0x000101EE	ED1A	EC99	EC3A	EBF5	EBCC	EBDF	EC1B	EC6D	ECDE	ED72	EE25	EEF9	EFEA
0x000101FB	F0F5	F21A	F35A	F4B3	F61A	0000	0000	0000	0000	0000	0000	0000	0000

  • 0 in reply to Miles Chun
    TI__Mastermind 30185 points

    Hello Miles,

    Please use the Save Memory option I described above, as this format will take me a significant amount of time to reformat in a way that I can graph it myself. Make sure to save it as the same data type that you are using (i.e. if the ADC results are unsigned 16-bits, the output data format is the same). Alternatively, you can export the data to an Excel sheet and graph the waveform to properly view it yourself.

    Best regards,

    Omer Amir

  • 0 in reply to Omer Amir
    Prodigy 140 points

    I'm sorry I'm late. 

    Here is the .dat file. 

    I also run the file with Excel, as I expected data is correct(Like the second figure). 

    But I was wondering why this problem happens in graph mode for the same data. 

    Thank you,. 

    saved (1).dat

  • 0 in reply to Miles Chun
    TI__Mastermind 30185 points

    Hello Miles,

    To clarify, this data was obtained while you were viewing the graph in continuous refresh mode, correct? So it was updating the graph continuously until you paused to save the data?

    If the exported .dat file looks like it has an incorrect waveform when graphing with continuous refresh mode, you may need to use a secondary buffer to plot the graph. You are overwriting data continuously, so you may end up with strange looking data. If you use a secondary buffer, it should write all the data points from the primary buffer at once, instead of doing one at a time continuously.

    However, if you use continuous refresh for the graphing tool and your data still looks correct, let me know. The issue will likely be something else.

    Best regards,

    Omer Amir