Posted on November 24, 2014 at 07:54Hello there,
I am using Lwip library for Ethernet implementation. I poll for the Ethernet packet in main loop. Then the packet is passed to further libraries to process it.
Meanwhile I have also to receive 8 bit data on Port GPIOH with clock on Timer 8 capture. Using DMA2, channel 7.
Receiving 220 bytes of parallel data @20 Mhz. DMA transfers it from GPIO port H to internal RAM
If I run the DMA without ethernet, it runs perfectly fine. but when ethernet is switched on, some of the DMA packets are lost.
Did a test and found 400 packets out of 100000. (0.4%)
Do not have sufficient window to retransmit the packet.
But cannot afford to loose the packet.
Hardware issues like noise etc are ruled out. Please Help.
Thanks in advance
#stm32f4 #dma
