Adrian Figueroa wrote:
There is a list of chained DMA transmit descriptors, as they seem to be called.
There is always four of them, this is hard coded.
My version of the STM32F4xx HAL driver leaves this as a define to the
application... But you're limited by DMA-capable RAM, of course.
Hi Noam,
thanks for your remark. I may also have some lwIP settings that are not correct
or optimal. Thus, I would also be interested in your lwipopts.h file.
What are the transfer rates that you reach? Can you continuously transmit
without packet loss?
Kind regards,
Adrian
Von: lwip-users
Beware: long text
I will try to write a new driver or repair the current one. However, I have
some questions for a better understanding of the underlying principles. At the
moment I only care about transmitting.
Let's start with the initialization of the DMA transmit buffers. There is a
list
Hi Adrian,
I am using the STM32F765 and do not see real any problem. The driver and low
level are
very similar to the F4.. There are some small changes in initializing code but
there is a change
in descriptors location. For some reason they force it to be on a specific
section. Maybe
a DMA
That memcpy is also used on the F7. The drivers are probably the same:
/* Copy data to Tx buffer*/
memcpy( (uint8_t*)((uint8_t*)buffer + bufferoffset),
(uint8_t*)((uint8_t*)q->payload + payloadoffset), (ETH_TX_BUF_SIZE -
bufferoffset) );
Adrian
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