Hi STea,
here are the versions of the different software components used in the project
Additionally, I read another interesting post on this topic ([BUG] STM32 lwIP Ethernet driver Tx deadlock) which seems to match my problem.
So I was thinking of making the following 2 corrections in the ethernetif.c file.
In "low_level_init" function :
replace
RxPktSemaphore = osSemaphoreNew(1, 1, NULL);
by
RxPktSemaphore = osSemaphoreNew(1, 0, NULL); // correction
and in "low_level_output" function :
replace
HAL_ETH_Transmit(&heth, &TxConfig, ETH_DMA_TRANSMIT_TIMEOUT);
by
if (HAL_ETH_Transmit(&heth, &TxConfig, ETH_DMA_TRANSMIT_TIMEOUT) != HAL_OK)
{
pbuf_free(p); // bug fix?
}
Does this seem like a good idea to you?
To receive packets, I used callback function and stack data like that
static void UDP_receive_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
{
AddrReceived = *addr;
PortReceived = port;
MODBUS_SRV_StackUdpBufferReceived (p->payload, p->len);
/* Free the pbuf buffer */
pbuf_free(p);
}
To transmit packets, I used this function
void UDP_Modbus_Server_send_buffer (uint8_t * DataToSend, uint16_t DataLength)
{
struct pbuf *txBuf;
if (UDP_CableEthConnected == true)
{
/* allocate pbuf from RAM*/
txBuf = pbuf_alloc(PBUF_TRANSPORT, DataLength, PBUF_RAM);
/* copy the data into the buffer */
pbuf_take(txBuf, DataToSend, DataLength);
/* Connect to the remote client */
if (udp_connect(pUdpModbusServerPcb, &AddrReceived, PortReceived) != (err_t)ERR_OK)
{
// no action
}
/* Send a Reply to the Client */
if (udp_send(pUdpModbusServerPcb, txBuf) != (err_t)ERR_OK)
{
// no action
}
/* free the UDP connection, so we can accept new clients */
udp_disconnect(pUdpModbusServerPcb);
/* Free the pbuf buffer */
pbuf_free(txBuf);
}
}
you can see my source code in the attached files
