---
title: "SOLVED - Wiz550io - Unable to activate interruptions"
url: "https://maker.wiznet.io/forum/10902"
markdown_url: "https://maker.wiznet.io/forum/10902/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "PJC"
created: "2015-03-15T14:17:00+09:00"
last_activity: "2017-05-04T08:35:03+09:00"
language: "en"
views: 425
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# SOLVED - Wiz550io - Unable to activate interruptions

## Question

Asked by PJC on 2015-03-15 in Ethernet Chips.

Hi,

i have been using so far my wiz55io module (with success) using a polling approach. Now i whish to use the interrupt mode but i can not go through the ESTABLISHED stage.

During the socket initialization sequence, after issuing the OPEN command and receive the SOCK_INT status, i write the desired mask to the Sn_IMR register using the code below.

```
CMD_WIZ.CMD_WIZ_0 = MASK_VALUE;
WRITE_REG_WIZ550io (&CMD_WIZ.CMD_WIZ_0, (uint16_t)(Sn_IMR),(num_socket << 2)+1,1);
```

With this piece of code, whatever the MASK_VALUE (0x00 or 0xFF), i get stuck in an endless loop in _main() waiting the SOCK_ESTABLISHED status to come - and no IT is generated

If i remove the same piece of code, the SOCK_ESTABLISHED status comes and everything is ok.

I am missing something ?

Any help appreciated.

Best regards

## Replies

### Reply 1 by PJC, 2015-03-18

I Finally found the solution. I had a bug in the SPI routine which conducts to a wrong setting of W5500 registers.
Everything now works as expected.

---

Source: https://maker.wiznet.io/forum/10902