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i.MX6Solo:UART DMA transfer problem

Question asked by koichi sakagami on Nov 5, 2015
Latest reply on Nov 23, 2015 by koichi sakagami

Dear community,

We have been developing our product with iMX6Solo.

 

[Background]
When we use the UART DMA transfer with "RXTL=8 CTSTL=8", it works fine.
However, when we use the UART DMA transfer with "RXTL=16 CTSTL=16",unnecessary data are included in RX data.


The unnecessary data are not included in the real waveform.
The appearance frequency of unnecessary data is high-frequency.
The unnecessary data appear 8 byte order.

 

[Question]
We changed only " RXTL and CTSTL field".

Why are the unnecessary data included in RX data ?
Do we have to set any register other than RXTL and CTSTL  in order to work uart module correctly ?

 

We attached log file. (Red character is unnecessary data.)
Could you check it and advise us  ?

 

[   52.059266] [bt] open ttymxc1

[   52.059284] [bt] UCR1 = 0x00000021

[   52.059294] [bt] UCR2 = 0x00000007

[   52.059303] [bt] UCR3 = 0x00000784

[   52.059311] [bt] UCR4 = 0x00004000

[   52.059358] [bt] set ttymxc1 speed: 9600

[   52.059368] [bt] UCR1 = 0x00000d2d

[   52.059376] [bt] UCR2 = 0x00004027

[   52.059383] [bt] UCR3 = 0x00000784

[   52.059391] [bt] UCR4 = 0x00004040

[   52.059628] [bt] set ttymxc1 speed: 9600

[   52.059641] [bt] UCR1 = 0x00000d2d

[   52.059650] [bt] UCR2 = 0x00002027

[   52.059658] [bt] UCR3 = 0x00000784

[   52.059665] [bt] UCR4 = 0x00004040

[   52.059721] [bt] set ttymxc1 speed: 115200

[   52.059731] [bt] UCR1 = 0x00000d2d

[   52.059739] [bt] UCR2 = 0x00002027

[   52.059746] [bt] UCR3 = 0x00000784

[   52.059754] [bt] UCR4 = 0x00004040

[   52.237021] [bt] USR1 = 0x00006040

[   52.237031] [bt] USR2 = 0x00004008

[   52.237043] [bt] rx: 04 0E 04 04 03 0C 00

[   52.237049] [bt] USR1 = 0x00006040

[   52.237053] [bt] USR2 = 0x00004008

[   52.268972] [bt] rx: 04 0E 0B 04 05 10 00 FD 00 00 00 00 00 00 00 00 03 FE 04 00

[   52.268980] [bt] rx: 03 00

[   52.268988] [bt] USR1 = 0x00006040

[   52.268992] [bt] USR2 = 0x00004008

[   52.309350] [bt] rx: 04 0E 04 04 33 0C 01

[   52.309370] [bt] USR1 = 0x00006040

[   52.309379] [bt] USR2 = 0x00004008

[   52.338923] [bt] rx: 04 0E 0C 04 03 10 00 FF 03 03 03 03 03 03 03 03 FB AD FE DB

[   52.338933] [bt] rx: FF 7B 87

[   52.338942] [bt] USR1 = 0x00006040

[   52.338946] [bt] USR2 = 0x00004008

[   52.368318] [bt] rx: 04 0E 0E 04 04 10 00 01 03 03 03 03 03 03 03 03 01 00 00 00

[   52.368328] [bt] rx: 00 00 00 00 01 01 01 01 01 01 01 01 00

[   52.368336] [bt] USR1 = 0x00006040

[   52.368340] [bt] USR2 = 0x00004008

 

 

Best Regards,
Koichi Sakagami

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