IWR1443: UART output data format and python reference

CF Tan

Prodigy 20 points

Part Number: IWR1443
Other Parts Discussed in Thread: MMWAVE-SDK, IWR1642,

Hi,

I'm referring to this thread https://e2e.ti.com/support/sensors/f/1023/p/660937/2430814

Can I have access to this python script to decode the UART byte stream too?

over 6 years ago

0 JohnH over 6 years ago

TI__Mastermind 21295 points

Hi CF,

Please see the following thread.

Regards,

John

0 CF Tan over 6 years ago in reply to JohnH

Prodigy 20 points

Hi John, thanks for pointing me to the relevant thread.

Some questions about the structure i'm referring to at mmwave_sdk_02_00_00_04/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

Is this the correct document to refer to? I'm finding that the totalPacketLen (Total packet length including header in Bytes) does not match the bytes i receive.

is subFrameNumber always included in the header? so number of fields excluding the magic word is 8, not 7?

in mmw__output_8h_source.h, the enumeration values for message output are missing, what should the values be?

 typedef enum MmwDemo_output_message_type_e
    {
        MMWDEMO_OUTPUT_MSG_DETECTED_POINTS = 1,
    
        MMWDEMO_OUTPUT_MSG_RANGE_PROFILE,
    
        MMWDEMO_OUTPUT_MSG_NOISE_PROFILE,
    
        MMWDEMO_OUTPUT_MSG_AZIMUT_STATIC_HEAT_MAP,
    
        MMWDEMO_OUTPUT_MSG_RANGE_DOPPLER_HEAT_MAP,
    
        MMWDEMO_OUTPUT_MSG_STATS,
    
        MMWDEMO_OUTPUT_MSG_MAX
    } MmwDemo_output_message_type;

0 JohnH over 6 years ago in reply to CF Tan

TI__Mastermind 21295 points

Hi CF,

If you have an IWR1443 device then you will actually need to download and use MMWAVE-SDK v1.2 (mmWave SDK v2.0 only supports IWR1642).

Then you would look at the IWR14xx demo at: C:\ti\mmwave_sdk_01_02_00_05\packages\ti\demo\xwr14xx\mmw\docs\doxygen\html\index.html.

It currently refers you to the IWR16xx demo documentation in the same SDK for the description the output data format:
C:\ti\mmwave_sdk_01_02_00_05\packages\ti\demo\xwr16xx\mmw\docs\doxygen\html\index.html

However, there is actually one difference in the header used in the IWR14xx and IWR16xx demos. If you look in mmw_output.h (C:\ti\mmwave_sdk_01_02_00_05\packages\ti\demo\io_interface\mmw_output.h) you will see that there is an #ifdef statement so the subFrameNumber field is only used for IWR16xx and is not present in the IWR14xx version of the demo.

typedef struct MmwDemo_output_message_header_t
88 {
90 uint16_t magicWord[4];
91
93 uint32_t version;
94
96 uint32_t totalPacketLen;
97
99 uint32_t platform;
100
102 uint32_t frameNumber;
103
105 uint32_t timeCpuCycles;
106
108 uint32_t numDetectedObj;
109
111 uint32_t numTLVs;
112
113 #ifdef SOC_XWR16XX
114
117 uint32_t subFrameNumber;
118 #endif
119 } MmwDemo_output_message_header;

Also, enumerated types in C allow you to optionally set the value of one enumerated value and then the following ones are just incremented numerically automatically. So the values for the enumerations would be as follows in the parentheses I added.

57 typedef enum MmwDemo_output_message_type_e
58 {
60 MMWDEMO_OUTPUT_MSG_DETECTED_POINTS = 1,
61
63 MMWDEMO_OUTPUT_MSG_RANGE_PROFILE, (= 2)
64
66 MMWDEMO_OUTPUT_MSG_NOISE_PROFILE, (= 3)
67
69 MMWDEMO_OUTPUT_MSG_AZIMUT_STATIC_HEAT_MAP, (= 4)
70
72 MMWDEMO_OUTPUT_MSG_RANGE_DOPPLER_HEAT_MAP, (= 5)
73
75 MMWDEMO_OUTPUT_MSG_STATS, (= 6)
76
77 MMWDEMO_OUTPUT_MSG_MAX (= 7)
78 } MmwDemo_output_message_type;

Regards,
John

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IWR1443: UART output data format and python reference