93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
#include "modbus-tcp.h"
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#include <tcp.h>
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#include <string.h>
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char tcp_buffer[1024];
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struct Data_Modbus {//registers to hold the data of the modbus
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uint16_t reg_00;//
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uint16_t reg_01;//
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uint16_t reg_03;//
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};
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struct Data_Modbus datamodbus;
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/*
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static err_t echo_recv( void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err )
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{
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int i;
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int len;
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char *pc;
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if ( err == ERR_OK && p != NULL )
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{
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tcp_recved( pcb, p->tot_len );
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pc = (char *)p->payload;
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len =p->tot_len;
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for( i=0; i<len; i++ )
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{
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tcp_buffer[i] = pc[i];
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}
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if( tcp_buffer[0] == 'X' )
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echo_close( pcb );
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pbuf_free( p );
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if( len > tcp_sndbuf( pcb ) )
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len= tcp_sndbuf( pcb );
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tcp_write( pcb, tcp_buffer, len, 0 );
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tcp_sent( pcb, NULL );
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}
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else
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{
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pbuf_free( p );
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}
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if( err == ERR_OK && p == NULL )
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{
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echo_close( pcb );
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}
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return ERR_OK;
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}
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*/
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static err_t modbus_incomming_data(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err){
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int i;
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int len;
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char *pc;
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printf("data incomming\n");
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return ERR_OK;
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}
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static err_t modbus_accept(void *arg, struct tcp_pcb *pcb, err_t err )
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{
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LWIP_UNUSED_ARG( arg );//Eliminates compiler warning about unused arguments
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LWIP_UNUSED_ARG( err );//Eliminates compiler warning about unused arguments
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tcp_setprio( pcb, TCP_PRIO_MIN );//Sets the priority of a connection.
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tcp_recv( pcb, modbus_incomming_data);//sets which function is being called when new data arives
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tcp_err( pcb, NULL );//sets the function thats called when an error ocours
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tcp_poll( pcb, NULL, 4 );//the aplication is being polled every 4 seconds
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tcp_write( pcb, "TEST\r\n", 8, 0 );//pcb , data , lenght in bytes , apiflags
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printf("connected\n");
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tcp_sent( pcb, NULL );//Specifies the callback function that should be called when data has successfully been received
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return ERR_OK;
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}
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void modbus_init( void )
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{
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struct tcp_pcb *modbus_pcb;
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modbus_pcb = tcp_new();//creating a new tcp pcb
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tcp_bind(modbus_pcb, IP_ADDR_ANY, MODBUSPOORT);//bind the modbus_pcb to port 502
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modbus_pcb = tcp_listen( modbus_pcb );//listen
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tcp_accept(modbus_pcb, modbus_accept);//set callback function
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}
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