// The modbus_write_registers() function shall write the content of the nb holding registers from the array src at address addr of the remote device.
// The function uses the Modbus function code 0x10 (preset multiple registers).
func (this *RtuConnection) Write_registers(addr int, values []uint16) error {
ioval := make([]C.uint16_t, len(values))
for i := 0; i < len(values); i++ {
ioval[i] = C.uint16_t(values[i])
}
res, errno := C.modbus_write_registers(this.ctx, C.int(addr), C.int(len(ioval)), &ioval[0])
if int(res) != len(ioval) {
return errors.New(modbus_strerror(errno))
}
return nil
}
func (this ModbusRTUConnection) WriteHoldings(slave int8, startAddr int, values []uint16) error {
if C.modbus_set_slave(this.ctx, C.int(slave)) != 0 {
return errors.New(fmt.Sprintf("Invalid slave id %d", slave))
}
vals := make([]C.uint16_t, len(values))
for i, v := range values {
vals[i] = C.uint16_t(v)
}
this.ProcessHook(RTU_10_LEN + len(values)*int(unsafe.Sizeof(vals[0])))
if C.modbus_write_registers(this.ctx, C.int(startAddr), C.int(len(values)), &vals[0]) < 0 {
return errors.New(C.GoString(C.modbus_strerror(C.getErrno())))
}
return nil
}
