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client_serial.c
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client_serial.c
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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "modbus.h"
#define MODBUS_SERIAL_DEV "/dev/ttyM0"
#define MODBUS_SERIAL_BAUDRATE 9600 /* 9600, 38400, 115200, ... */
#define MODBUS_SERIAL_PARITY 'N' /* 'N', 'E', or 'O' */
#define MODBUS_SERIAL_DATABITS 8 /* 5, 6, 7, or 8 */
#define MODBUS_SERIAL_STOPBITS 1 /* 1 or 2 */
#define MODBUS_DEVICE_ID 10
#define MODBUS_TIMEOUT_SEC 3
#define MODBUS_TIMEOUT_USEC 0
#define MODBUS_DEBUG ON
int main(int argc, char *argv[])
{
modbus_t *ctx;
struct timeval timeout;
int ret, i, rc, ii;
int nb_pointers;
// unit16_t *tab_rp_registers;
uint16_t regs[MODBUS_MAX_READ_REGISTERS] = {0};
char regs2[MODBUS_MAX_READ_REGISTERS]={0};
FILE *fp = NULL;
if(argc != 3){
printf("INsufficient argument");
return -1;
}
ctx = modbus_new_rtu(MODBUS_SERIAL_DEV,
MODBUS_SERIAL_BAUDRATE,
MODBUS_SERIAL_PARITY,
MODBUS_SERIAL_DATABITS,
MODBUS_SERIAL_STOPBITS);
if (ctx == NULL) {
fprintf(stderr, "Unable to create the libmodbus context\n");
exit(-1);
}
i = modbus_rtu_get_serial_mode(ctx);
if( i == MODBUS_RTU_RS232)
{
printf("Serial mode = RS232\n");
ret = modbus_rtu_set_serial_mode(ctx, MODBUS_RTU_RS232);
if(ret < 0)
fprintf(stderr, "modbus_rtu_set_serial_mode() error: %s\n", strerror(errno));
}
else if(i == MODBUS_RTU_RS485)
{
printf("Serial mode = RS485\n");
ret = modbus_rtu_set_serial_mode(ctx, MODBUS_RTU_RS485);
if(ret < 0)
fprintf(stderr, "modbus_rtu_set_serial_mode() error: %s\n", strerror(errno));
}
/* else
{
printf("Serial mode = RS485\n");
ret = modbus_rtu_set_serial_mode(ctx, MODBUS_RTU_RS485);
if(ret < 0)
fprintf(stderr, "modbus_rtu_set_serial_mode() error: %s\n", strerror(errno));
}
*/
/* set slave device ID */
modbus_set_slave(ctx, MODBUS_DEVICE_ID);
/* Debug mode */
modbus_set_debug(ctx, MODBUS_DEBUG);
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Allocate and initialize the memory to store the registers */
/* nb_points = (UT_REGISTERS_NB > UT_INPUT_REGISTERS_NB) ?
UT_REGISTERS_NB : UT_INPUT_REGISTERS_NB;
tab_rp_registers = (uint16_t *) malloc(nb_points * sizeof(uint16_t));
memset(tab_rp_registers, 0, nb_points * sizeof(uint16_t));
*/
/* write data in test.txt */
fp = fopen("test.txt", "w");
if(fp == NULL)
{
printf("fail to open file!\n");
return -1;
}
rc = modbus_read_registers(ctx, strtol(argv[1], NULL, 16), strtol(argv[2], NULL, 10), regs);
if (rc < 0) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
}
else {
printf("HOLDING REGISTERS:\n");
for (ii=0; ii < rc; ii++) {
sprintf(regs2, "%d", regs[ii]);
fputs(regs2, fp);
fputs("\n", fp);
printf("[%d]=%d\n", ii, regs[ii]);
}
}
fclose(fp);
/* Close the connection */
modbus_close(ctx);
modbus_free(ctx);
return 0;
}