Associate III

Question

example using HAL ETH without LWiP for raw ethernet frames?

Forum|Forum|8 years ago
June 9, 2017
13 replies
14049 views

Posted on June 09, 2017 at 20:41

[reposting after 30 days of no responses]

Hello all,

I have been making great progress using CubeMX and HAL for lots of things, now I want to try ethernet. My application is very simple, I only want to send and receive raw ethernet frames -- no UDP or TCP at all. I also prefer not to use LWiP for something so basic. Can anyone point me to an example of raw ethernet frame IO using just HAL? I will be using Nucleo F429ZI.

My requirements:

[ ] send a raw frame (source and destination MAC address, type IP and payload, total less than 1500 bytes)

[ ] receive interrupt upon receipt of a raw ethernet frame

My transactions are slow and simple, I do not even need any buffer queuing.

Thanks for any tips.

#raw-ethernet-frame

Ethernet

Elwood DowneyAuthor

Associate III

Posted on May 05, 2017 at 22:14

Hello all,

I have been making great progress using CubeMX and HAL for lots of things, now I want to try ethernet. My application is very simple, I only want to send and receive raw ethernet frames -- no UDP or TCP at all. I also prefer not to use LWiP for something so basic. Can anyone point me to an example of raw ethernet frame IO using just HAL? I will be using Nucleo F429ZI.

My requirements:

[ ] send a raw frame (source and destination MAC address, type IP and payload, total less than 1500 bytes)

[ ] receive interrupt upon receipt of a raw ethernet frame

My transactions are slow and simple, I do not even need any buffer queuing.

Thanks for any tips.

#raw-ethernet-frame #stm32f429 #hal

Tesla DeLorean

Guru

Posted on June 10, 2017 at 15:56

You'll likely need to separate the frame and initialization code from the layer above you don't want

(##) HAL_ETH_TransmitFrame();

(##) HAL_ETH_GetReceivedFrame(); (should be called into an infinite loop)

(##) HAL_ETH_GetReceivedFrame_IT(); (called in IT mode only)

Tear what you need out of ethernetif.c

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Elwood DowneyAuthor

Associate III

Posted on June 22, 2017 at 21:55

Thanks Clive. Making a temporary lwip project thengutting ethernetif.c was extremely helpful. I have it all working now, getting close to wire speeds both ways.

In case others see this thread in the future, here are a few observations:

* Phy address must be 0 for the

Nucleo F429ZI.

CubeMX 4.0 still sets it to 1 by default even though this was reported over a year ago in t

https://community.st.com/0D50X00009XkgfISAR

.

* Never could get HAL_ETH_TxCpltCallback to fire. Fortunately the tx descriptor states allow

reliable in-line retries.

*

The default MAC filters are such that

RxCplt will only fire on receipt of broadcast MAC FF:FF:FF:FF:FF:FF or the one passed to

HAL_ETH_Init().

* Speaking of MAC, the array to which

heth.Init.MACAddr is set in

MX_ETH_Init() really should be static so it can be used later.

angus schmaloer

Associate III

Posted on October 09, 2017 at 14:50

Hey,

I want to apply Ethernet on my stm32f779I-EVAL board, but i am very new to Ethernet.

I also don't want to use the lwIP driver, because i only want to send some json strings.

Do you have by any change an example program ready?

David Dk

Visitor II

Posted on December 06, 2017 at 11:40

Hi,

Downey.Elwood

eludar

‌

any chance that one of you upload a minimal working example?

Best wishes, David

Aleksandar Radulovic

Visitor II

Posted on December 07, 2017 at 10:08

Hi David,

as far as enabling the TX callback is concerned, you can use the provided examples. In low_level_init() add the above mentioned two lines of code. For example, you can add them after initializing descriptors lists:

/* Initialize Tx Descriptors list: Chain Mode */

HAL_ETH_DMATxDescListInit(&heth, DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);

/* Initialize Rx Descriptors list: Chain Mode */

HAL_ETH_DMARxDescListInit(&heth, DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);

__HAL_ETH_DMA_ENABLE_IT(&heth, ETH_DMA_IT_T);

__HAL_ETH_DMATXDESC_ENABLE_IT(&heth);

I haven't actually used the TX callback for real - I was just curious how to enable it...

Best regards,

Aleksandar