Hello there.
so look. I use LwIP 1.3.2 on ST32F207 ARM microcontroller. I want to send a
lot of data from ST32 to PC using UDP, in standalone application.
I make a application basic on udp-server demo. Its great work, if _i dont
free the pbuf in udp_receive callback_.
if i add a pbuf_free(p); at end of callback, the data transfer corrupting,
it going to be uneven, fragmentary. This is my code:
//my receive callback:
void udp_echoserver_receive_callback(void *arg, struct udp_pcb *upcb, struct
pbuf *p, struct ip_addr *addr, u16_t port)
{
//remember the structures to use it in send function
upcb1 = upcb;
addr1 = addr;
parseIncomingMessage(p); //searching for commands in incoming messages
/* Free the p buffer */
pbuf_free(p); //this is it! if i use it, it is uneven transmit! If not,
app receive only few messages and going to corrupt
}
And there is my send function:
void udpSendArray(uint16_t data[])
{
err_t err;
uint16_t len = udpPackageSize + headerSize;
struct pbuf *pb = pbuf_alloc(PBUF_TRANSPORT,len, PBUF_REF);
pb->payload = data;
udp_connect(upcb1, addr1, UDP_CLIENT_PORT);
err = udp_send(upcb1, pb);
if(err!=ERR_OK) {
//do something. But application never enter this block
}
udp_disconnect(upcb1);
pbuf_free(pb);
}
this function periodically calling from main cycle (main.c):
while (1)
{
/* check if any packet received */
if (ETH_CheckFrameReceived())
{
/* process received ethernet packet */
LwIP_Pkt_Handle();
}
/* handle periodic timers for LwIP */
LwIP_Periodic_Handle(LocalTime);
if (full_transmit) udpSendArray(bufADC1);
}
My code is correct, i think. or not? How to make it work normal? I cant kill
this bug