DLPNIRNANOEVM: UART FRAME SEQUENCE EXAMPLE

Dawid Lukaszów

Part Number: DLPNIRNANOEVM
Other Parts Discussed in Thread: TMP006

Tool/software:

Hi,

I try to communiacte with DLPNIRNANOEVM through UART, but i allways receive the same frame as respond.

Can You check what am I sendind wrong or how should that frame looks like to receive a proper respond?

I'm sending the hex values seuence:
0x41 0x42 0x43 0x44 0xF0 0x00 0x00 0x00 0xC0 0x00 0x02 0x00 0x16 0x00 0x44 0x43 0x42 0x41

where "0x16 0x00" should be a command byte for (NNO_CMD_TIVA_VER - Read Tiva version information) from Table I-3. DLP NIRscan Nano UART Commands at user manual.

or a
0x41 0x42 0x43 0x44 0xF0 0x00 0x00 0x00 0xC0 0x00 0x02 0x00 0x00 0x03 0x44 0x43 0x42 0x41
where "0x00 0x03" should be a command byte for (NNO_CMD_READ_TEMP - Read temperature (TMP006) sensor) from Table I-3. DLP NIRscan Nano UART Commands at user manual,

but at every time DLPNIRNANOEVM green led light starts to blink quicker and I receive the same sequence:
{41}{42}{43}{44}{D0}{00}{00}{00}{D0}{00}{00}{00}{44}{43}{42}{41}

Please let me know how my frame should looks like to receive a proper responds.

Regards
Dawid

over 1 year ago

0 Austin Snyder over 1 year ago

TI__Genius 12785 points

Hello Dawid,

Thank you for this information. Please allow the team until the end of the week to resond.

Regards,

Austin

+1 Akhil Guntumadugu over 1 year ago

TI__Expert 3825 points

Hello Dawid,

The group byte for read version command is 0x02 and not 0x00. hence command for read version should be "0x16 0x02" not "0x16 0x00".
Also the checksum you are sending is invalid. the proper checksum for read version command with flags "0xC0" is 0xDA.

checksum = sum of all these bytes [0xC0, 0, 0x02, 0, 0x16, 0x02] = 0xDA

FYR below is the proper read version command.

const unsigned char readVerWr[] = { 0x41, 0x42, 0x43, 0x44, 0xDA, 0, 0, 0, 0xC0, 0, 0x02, 0, 0x16, 0x02, 0x44, 0x43, 0x42, 0x41};

Please correct the checksum and the command bytes properly.

Regards,

Akhil

+1 Dawid Lukaszów over 1 year ago in reply to Akhil Guntumadugu

Prodigy 20 points

Hello Akhil,

Thank you for reply,
your example exackly explain how to prepare a proper commands.

Now Nano responds correctly to every query.

additionally helpful was a thread below (Im adding it for next interested peoples):
e2e.ti.com/.../dlpnirnanoevm-communication-over-uart

Regards,

Dawid

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DLPNIRNANOEVM: UART FRAME SEQUENCE EXAMPLE