94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
#include "ModbusS.h"
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#include "lwip/ip_addr.h"
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#include "lwip/udp.h"
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#include "ql_log.h"
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extern struct netif *t2n_if;
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#define LOGD(msg, ...) QL_LOG(QL_LOG_LEVEL_DEBUG, "modbus_udp", msg, ##__VA_ARGS__)
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#define LOGI(msg, ...) QL_LOG(QL_LOG_LEVEL_INFO, "modbus_udp", msg, ##__VA_ARGS__)
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#define LOGW(msg, ...) QL_LOG(QL_LOG_LEVEL_WARN, "modbus_udp", msg, ##__VA_ARGS__)
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#define LOGE(msg, ...) QL_LOG(QL_LOG_LEVEL_ERROR, "modbus_udp", msg, ##__VA_ARGS__)
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void recv_callback_modbus_udp(void *arg, struct udp_pcb *upcb, struct pbuf *pkt_buf,
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const struct ip_addr *addr, u16_t port)
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{
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err_t err = ERR_OK;
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// uint16_t id, _id;
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struct pbuf *pkt_tbuf; /* Chain of pbuf's to be sent */
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uint8_t *txbuf;
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uint8_t *rxbuf;
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int txlen, rxlen;
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/* We call this function to tell the LwIp that we have processed the data */
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/* This lets the stack advertise a larger window, so more data can be received*/
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// eat_trace("[%s] ip=%d.%d.%d.%d port=%d",
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// __FUNCTION__,ip4_addr1(addr),ip4_addr2(addr),ip4_addr3(addr),ip4_addr4(addr),port);
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if (pkt_buf->tot_len < 6)
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{
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pbuf_free(pkt_buf);
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//return ERR_VAL;
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return;
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}
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rxbuf = (uint8_t *)pkt_buf->payload;
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// id = (rxbuf[0] << 8) + rxbuf[1];
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// _id = (rxbuf[2] << 8) + rxbuf[3];
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// if((id + _id)&0xffff != 0)
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// {
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// pbuf_free(pkt_buf);
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// return ERR_VAL;
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// }
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/* PBUF_TRANSPORT - specifies the transport layer */
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pkt_tbuf = pbuf_alloc(PBUF_TRANSPORT, 1024 + 16, PBUF_RAM);
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if (!pkt_tbuf) /*if the packet pbuf == NULL exit and EndTransfertransmission */
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{
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pbuf_free(pkt_buf);
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return;
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// return ERR_MEM;
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}
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txbuf = (uint8_t *)pkt_tbuf->payload;
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rxlen = pkt_buf->len;
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txlen = ModbusSlaveProcess(&txbuf[6], &rxbuf[6], (rxlen - 6), 0);
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// eat_trace("[%s] ModbusSlaveProcess (ret=%d)", __FUNCTION__,txlen);
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if (txlen > 0)
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{
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int i;
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for (i = 0; i < 4; i++)
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{
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txbuf[i] = rxbuf[i];
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}
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txbuf[4] = (uint8_t)(txlen >> 8);
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txbuf[5] = (uint8_t)(txlen & 0xff);
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pkt_tbuf->len = txlen + 6;
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pkt_tbuf->tot_len = txlen + 6;
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err = udp_sendto(upcb, pkt_tbuf, addr, port);
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LOGI("udp_sendto(upcb, pkt_tbuf, addr, port) err - %d",err);
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}
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/* free the buffer pbuf */
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pbuf_free(pkt_buf);
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pbuf_free(pkt_tbuf);
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}
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void ModBusUDPSlave_init(void)
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{
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err_t err;
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unsigned int port = 5002;
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struct udp_pcb *UDPpcb;
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/* create a new UDP PCB structure */
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UDPpcb = udp_new();
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if (!UDPpcb)
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{
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/* Error creating PCB. Out of Memory */
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return;
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}
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/* Bind this PCB to port 5002 */
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err = udp_bind(UDPpcb, NULL, port);
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if (err != ERR_OK)
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{
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/* Unable to bind to port */
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return;
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}
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udp_bind_netif(UDPpcb, t2n_if);
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/* TFTP server start */
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udp_recv(UDPpcb, recv_callback_modbus_udp, NULL);
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}
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