LIBUARTE strange behaviour

[rchaudet]

Hi everyone,

I am trying to solve a bug I am facing for several days now, it is related to LIBUARTE communication with a GPS module

Communication is init at 115200 BAUD and with a timeout of 100us.

The GPS module sends data every second. This data is composed by several frames, all starting with '$' and ending with " *xx " (xx can be any number)

Here is an example of correct data:

Fullscreen

1

2

3

4

5

6

7

8

9

$GNRMC,164352.97,V,,,,,,,060421,,,N,V*11

$GNGGA,164352.97,,,,,0,04,8.0,,M,,M,,*7D

$GNGLL,,,,,164352.97,V,N*5D

$GPGSV,16,,,31,26,,,20,27,,,32,1*6D

$GPGSV,2,2,07,08,,,25,26,,,21,27,,,25,8*60

$GLGSV,1,1,02,82,,,20,81,,,24,1*7D

$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,4*3C

$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,5*3D

$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,6*3E

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

$GNRMC,164352.97,V,,,,,,,060421,,,N,V*11
$GNGGA,164352.97,,,,,0,04,8.0,,M,,M,,*7D
$GNGLL,,,,,164352.97,V,N*5D
$GPGSV,16,,,31,26,,,20,27,,,32,1*6D
$GPGSV,2,2,07,08,,,25,26,,,21,27,,,25,8*60
$GLGSV,1,1,02,82,,,20,81,,,24,1*7D
$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,4*3C
$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,5*3D
$GNGSA,A,1,,,,,,,,,,,,,16.7,8.0,14.7,6*3E

But here is the data I actually receive from GNSS module:

"NEWFRAME" is to indicate the beginning of a new packet of data in the UART handler.

Fullscreen

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

NEWFRAME$PQGNSS,001*15

$PQVER,MODULE_LC79DANR01A04S,2019/12/18,10:17:15*25

$PQVER,SUB_V03*22

$PQVER,GL_20.23*15

$PQVER,GL_ANEWFRAME000100000000000000000000000000000000000000000000000000000000000000000000*42

$PQSWCONFIG,1,2,4,000000000000000000000000NEWFRAME00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000NEWFRAME101010101010000*3E

ER,MODULE_LC79DANR01A04S,2019/12/18,10:17:15*25

$PQVER,SUB_V03*22

$PQVER,GL_20.23*15

$PQVER,GL_ANEWFRAME$GNRMC,164052.86,V,,,,,,,060421,,,N,V*12

$GNGGA,164052.86,,,,,0,00,99.0,,M,,M,,*42

$GNGLL,,,,,164052.86,V,N*5E

$GNGSNEWFRAME99.0,3*01

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,4*06

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,5*07

$GNGSA,A,1,,,,,,,,,,NEWFRAME$GNRMC,164053.86,V,,,,,,,060421,,,N,V*13

$GNGGA,164053.86,,,,,0,00,99.0,,M,,M,,*43

$GNEWFRAMENGLL,,,,,164053.86,V,N*5F

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*03

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,2*00

$GNGNEWFRAME,1,,,,,,,,,,,,,99.0,99.0,99.0,6*04

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

NEWFRAME$PQGNSS,001*15
$PQVER,MODULE_LC79DANR01A04S,2019/12/18,10:17:15*25
$PQVER,SUB_V03*22
$PQVER,GL_20.23*15
$PQVER,GL_ANEWFRAME000100000000000000000000000000000000000000000000000000000000000000000000*42
$PQSWCONFIG,1,2,4,000000000000000000000000NEWFRAME00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000NEWFRAME101010101010000*3E
ER,MODULE_LC79DANR01A04S,2019/12/18,10:17:15*25
$PQVER,SUB_V03*22
$PQVER,GL_20.23*15
$PQVER,GL_ANEWFRAME$GNRMC,164052.86,V,,,,,,,060421,,,N,V*12
$GNGGA,164052.86,,,,,0,00,99.0,,M,,M,,*42
$GNGLL,,,,,164052.86,V,N*5E
$GNGSNEWFRAME99.0,3*01
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,4*06
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,5*07
$GNGSA,A,1,,,,,,,,,,NEWFRAME$GNRMC,164053.86,V,,,,,,,060421,,,N,V*13
$GNGGA,164053.86,,,,,0,00,99.0,,M,,M,,*43
$GNEWFRAMENGLL,,,,,164053.86,V,N*5F
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*03
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,2*00
$GNGNEWFRAME,1,,,,,,,,,,,,,99.0,99.0,99.0,6*04
$GNVTG,,T,,M,,N,,K,N*32
$GNRMC,164053.88,V,,,,,,,060421,,,N,V*1D
$GNGGA,164053.88NEWFRAME,1,,,,,,,,,,,,,99.0,99.0,99.0,2*00
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,3*01
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,4NEWFRAME$GNRMC,164054.86,VNEWFRAME,,,,,,,060421,,,N,V*14
$GNGGA,164054.86,,,,,0,00,99.0,,M,,M,,*44
$GNGLL,,,,,164054.86,V,N*58
$GPGSV,1,1,01,08,,,30,1NEWFRAME
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,4*06
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,5*07
$GNGSA,A,1,,,,,,,,,,,,,99.0,99NEWFRAME$GNRMC,164055.86,V,,,,,,,060421,,,N,V*15
$GNGGA,164055.86,,,,,0,00,99.0,,M,,M,,*45
$GNGLL,,,,,1NEWFRAME64055.86,V,N*59
$GPGSV,1,1,01,16,,,24,1*64
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*03
$GNGSA,A,1,,,,,,,,,,,,,99.0,99NEWFRAME9.0,5*07
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,6*04
$GNVTG,,T,,M,,N,,K,N*32
64054.86,V,N*58
$GPGSV,1,1,01,08,,,30,1NEWFRAME$GNRMC,164056.86,V,,,,,,,060421,,,N,V*16
$GNGGA,164056.86,,,,,0,00,99.0,,M,,M,,*46
$GNGLL,,,,,164056.86,V,N*5A
$GPGSNEWFRAME0,99.0,99.0,1*03
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,2*00
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,3*01
$GNGSA,A,1,,,NEWFRAME$GNRMC,164057.86,V,,,,,,,060421,,,N,V*17
$GNGGA,164057.86,,,,,0,00,99.0,,M,,M,,*47
$GNGLL,,,,,164057.86,V,N*5B
$GPGSNEWFRAME,,,,,,99.0,99.0,99.0,3*01
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,4*06
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,5*07
$GNGNEWFRAME$GNRMC,164058.86,V,,,,,,,060421,,,N,V*18
$GNGGA,164058.86,,,,,0,00,99.NEWFRAME0,,M,,M,,*48
$GNGLL,,,,,164058.86,V,N*54
$GPGSV,1,1,02,16,,,25,27,,,28,1*69
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*NEWFRAME$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,5*07
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,6*04
$GNVTG,,T,,M,,N,,K,N*32
,V,N*5NEWFRAME$GNRMC,164059.86,V,,,,,,,060421,,,N,V*19
$GNGGA,164059.86,,,,,0,00,99.0,,M,,M,,*49
$GNGLL,,,,,164059.86,V,N*55
$GPGSNEWFRAME$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*03
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,2*00
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.NEWFRAME.0,6*04
$GNVTG,,T,,M,,N,,K,N*32
,V,N*54
$GPGSV,1,1,02,16,,,25,27,,,28,1*69
$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0,1*NEWFRAME$GNRMC,164100.86,V,,,,,,,060421,,,N,V*14
$GNGGA,164100.86,,,,,0,00,99.0,,M,,M,,*44

Here are my two problems:

1- UART handler is not called at the end of the gps module packets, but somewhere in the middle of them

2- Sometimes, even inside one uart handler packet, I can see that NMEA frames are truncated (missing several bytes)

I already tried to increase uart timeout between 100 to 10000 whithout any improvement (I am getting the exact same output)

my UART instance is defined this way: 

Fullscreen

1

NRF_LIBUARTE_ASYNC_DEFINE(libuarte_gnss, 0, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3);

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

NRF_LIBUARTE_ASYNC_DEFINE(libuarte_gnss, 0, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3);

Any idea where this issue could come from?

Best regards