ChibiOS Free Embedded RTOS

Giovanni, can you please explain IRAM2 definition in compiler options? What address is it? Why is it only 1 byte long?

It seems Ethernet MTU is 1500 max. in my system.

Giovanni wrote:The frame size is set to 1522 which is the maximum. Probably it is because the IPv4 header is up to 20 bytes long.

Frame length is 1514 max. Look for this packet:

I need 1500 bytes according to max. Ethernet MTU. Excluding 8 bytes of ICMP header and 16 bytes IPv4 header it should be 1476 bytes for ICMP ping payload.

I don`t what this pulses are but after configuring I/O pins Ethernet become works.

Why the maximum data payload for ping packets is 1472 bytes? What part of code define this limit? STM32 accept up to 8KB packets and contain 2KB FIFO buffer.

Is this correct form of RXDV falling edge? I can see this eight pulses constantly at falling edge. Is it defined by RMII?

Hi Giovanni,
CH_IRQ_HANDLER(ETH_IRQHandler) {
uint32_t dmasr;

CH_IRQ_PROLOGUE();

dmasr = ETH->DMASR;
ETH->DMASR = dmasr; /* Clear status bits.*/

if (dmasr & ETH_DMASR_RS) {
/* Data Received.*/
chSysLockFromIsr();
chSemResetI(&ETHD1.rdsem, 0);
#if MAC_USE_EVENTS ...

Once the buffers are filled no more interrupts are be triggered until the frames are removed by the upper layer. Probably by placing the breakpoint the buffers get filled immediately while the CPU is stopped.

Giovanni
I supposed that existing demo code process incoming frames. Because contain web ...

I have solved problem with MAC<->PHY communication. The problem was in remapping RXD0, RDX1 and RXDV pins by USART3 according to initial Olimex board schematic.

Now I see coming packets on RMII interface by oscilloscope. CH_IRQ_HANDLER(ETH_IRQHandler) called only once during runtime. Both if (dmasr ...

No, the PHY address was correct. At startup PHY has default address 0x1 caused buy his internal pull-up and pull-down. The function mii_find_phy() works properly. Link goes down and then up during MCU startup when PHY address selected properly.

If you mean CH_IRQ_HANDLER(ETH_IRQHandler) , this ...