RM57L843: lwIP TCP/IP packet processing

Zsolt Nagy

Part Number: RM57L843
Other Parts Discussed in Thread: HALCOGEN,

Hello Everyone,

After establishing connection between the Hercules and the PC and after I'm trying to get the data from the struct passed to the application layer (recv_data), I always get the following results in recv_data, after reading it from the watchdog variable:

*recv_data struct pbuf {next=0xEA005BB2 {next=???,payload=0xEAFFFFFE,tot_len=65534,len=60159,type=254 '\xfe'... 0x00000000

I successfully pinged the Hercules and tried to connect to it with Ncat, too, but the result above stays the same.

I would like to extract data from the bitstream, e.g.: if I press "P" on the keyboard of the computer, I would like to extract that "P" in the controller from the bitstream; and this applies to not just letters, but words and numbers, too.

I'm using raw api.

Thanks for your answers in advance.

Regards,

Zsolt

over 7 years ago

0 QJ Wang over 7 years ago

TI__Guru**** 196416 points

Hi Zsoft,

Is you code from LWIP demo for RM57?

0 Zsolt Nagy over 7 years ago in reply to QJ Wang

Intellectual 310 points

Yes.

0 Zsolt Nagy over 7 years ago in reply to Zsolt Nagy

Intellectual 310 points

These are my memory settings in HALCoGen, I set them according to the post e2e.ti.com/.../666055

First, i would like to make sure that the memory setting is okay, because the post was made to TMS microcontrollers, but I own an RM57L843.

Thanks for your replying in advance.

Best regards,

Zsolt Nagy

0 QJ Wang over 7 years ago in reply to Zsolt Nagy

TI__Guru**** 196416 points

Hello Zsoft,

The recv_data is the content in the beginning of of flash: 0xEA..., 0xFFF...
Please disable Cache and try again. Thanks

0 Zsolt Nagy over 7 years ago in reply to QJ Wang

Intellectual 310 points

Thanks for the reply. I did this and I guess this wasn't the problem, the memory settings are okay.

The problem was that - as I inspected the code and the bitstream with Wireshark - that no TCP packet was sent to the microcontroller, so the lwIP TCP module did not activate. I successfully pinged it from command line (I'm using Windows 10), but when i try to use Ncat with commands like these:

echo -n 'm' | ncat <server> <port>

or just

ncat <server> <port>

I always get the following message in command line: "No connection could be made because the target machine actively refused it "

I switched off the firewall, but it had no effect, still get this message.

Any ideas?

Thanks for your help in advance.

Best regards,

Zsolt

0 QJ Wang over 7 years ago in reply to Zsolt Nagy

TI__Guru**** 196416 points

Hello Zsoft,

You can find some useful information from this link:

github.com/.../unit

Arm-based microcontrollers

Arm-based microcontrollers forum

RM57L843: lwIP TCP/IP packet processing