int net_send(const void * buf, int len)
{
void * pkt;
pkt = pktbuf_alloc();
if (pkt == NULL) {
DCC_LOG(LOG_ERROR, "pktbuf_alloc() failed!");
return -1;
}
DCC_LOG2(LOG_TRACE, "pkt=%p len=%d", pkt, len);
len = MIN(len, pktbuf_len);
memcpy(pkt, buf, len);
pkt = rs485_pkt_enqueue(&net.link, pkt, len);
net.stat.tx.pkt_cnt++;
net.stat.tx.octet_cnt += len;
if (pkt != NULL)
pktbuf_free(pkt);
return 0;
}
int net_probe(void)
{
void * pkt;
int ret;
/* drain the transmmit queue */
pkt = rs485_pkt_drain(&net.link);
if (pkt != NULL)
pktbuf_free(pkt);
/* set the probe pin low */
net.probe_mode = true;
stm32_gpio_clr(RS485_MODE);
DCC_LOG(LOG_TRACE, "Probe mode.");
thinkos_flag_clr(net.probe_flag);
if ((pkt = pktbuf_alloc()) != NULL) {
uint32_t seq;
while ((seq = rand()) == 0);
/* send a probe packet */
sprintf((char *)pkt, "PRB=%08x", seq);
DCC_LOG1(LOG_TRACE, "seq=0x%08x", seq);
rs485_pkt_enqueue(&net.link, pkt, 12);
net.stat.tx.pkt_cnt++;
net.stat.tx.octet_cnt += 12;
/* wait for the end of transmission */
pkt = rs485_pkt_drain(&net.link);
pktbuf_free(pkt);
if ((ret = thinkos_flag_timedwait(net.probe_flag, 10)) == 0) {
if (seq != net.probe_seq) {
DCC_LOG(LOG_WARNING, "probe sequence mismatch!");
ret = -1;
}
} else if (ret == THINKOS_ETIMEDOUT) {
DCC_LOG(LOG_WARNING, "probe sequence timedout!");
}
DCC_LOG1(LOG_TRACE, "seq=0x%08x", seq);
} else {
DCC_LOG(LOG_ERROR, "pktbuf_alloc() failed!");
ret = -1;
}
/* set the probe pin high */
net.probe_mode = false;
stm32_gpio_set(RS485_MODE);
DCC_LOG(LOG_TRACE, "Probe mode.");
return ret;
}
int net_pkt_send(const void * buf, int len)
{
struct net_pkt * pkt;
unsigned int data_len;
uint8_t * dst;
uint8_t * src;
int i;
pkt = (struct net_pkt *)pktbuf_alloc();
if (pkt == NULL) {
DCC_LOG(LOG_ERROR, "pktbuf_alloc() failed!");
DBG("pktbuf_alloc() failed!\n");
net.stat.tx.err_cnt++;
return -1;
}
data_len = MIN(len, pktbuf_len - sizeof(struct net_pkt));
pkt->crc = 0;
pkt->data_len = data_len;
pkt->seq = net.tx_seq++;
dst = (uint8_t *)pkt->data;
src = (uint8_t *)buf;
for (i = 0; i < data_len; ++i)
dst[i] = src[i];
pkt->crc = crc16ccitt(0, pkt, data_len + sizeof(struct net_pkt));
pkt = rs485_pkt_enqueue(&net.link, pkt,
data_len + sizeof(struct net_pkt));
net.stat.tx.pkt_cnt++;
net.stat.tx.octet_cnt += data_len + sizeof(struct net_pkt);
if (pkt != NULL)
pktbuf_free(pkt);
return 0;
}