---
title: "We cannot debug W7500P cause of using a C-Library."
url: "https://maker.wiznet.io/forum/12550"
markdown_url: "https://maker.wiznet.io/forum/12550/md"
type: "Forum topic"
category: "MCU & Boards"
author: "Ilya"
created: "2017-11-03T14:25:20+09:00"
last_activity: "2018-01-29T00:53:43+09:00"
language: "en"
views: 739
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# We cannot debug W7500P cause of using a C-Library.

## Question

Asked by Ilya on 2017-11-03 in MCU & Boards.

Hello! We use the MC W7500P. And we have problems with transmission of TCP/IP packets into the network. Packets were transfering, but with a delay (sometimes the delau grew up to 1 second and more). And the time delay changed during the work. We tried to load into W7500P the library, which was taken from your website (“WZTOE_LoopbackTest”) and AFTER THAT we cannot earse or write flash memory, so we cannot debug the MC. We use for programming “Keil 5” and debugger “Ulink 2”. In Keil 5 we see the window with the message: “Device could not be powered up”.Tell us please, how can we recover a normal operation f W7500P?

P.S. we do not use the board WIZwiki-W7500x, our board was made by ourself for W7500P.

## Replies

### Reply 1 by irina, 2018-01-29

Is your W7500P board still in trouble?
If so, please leave a reply.

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Source: https://maker.wiznet.io/forum/12550