ATXMega192C3 and fm25c256.lib

andrge · Joined: 26 Oct 2011 Posts: 30 Location: Kaufbeuren

Hello,

I would like to use the fm25c256.lib for a project with the ATXMega192C3. Unfortunately I can't get the lib to run.
What is wrong in my code?
Does anyone have a running example?
It looks like no data is being saved. I am using an EEPROM from ST M95256-WMN6TP. I have adjusted the time for saving. The EEPROM needs 5ms.

regards
Andreas

albertsm · Joined: 09 Apr 2004 Posts: 5922 Location: Holland

you need to use the XMega version : FM24C64_256-XMEGA.lib

andrge · Joined: 26 Oct 2011 Posts: 30 Location: Kaufbeuren

Hello Marc,

thank you for feedback. This is a good idea. I hadn't noticed that.

Another basic question, do MOSI, MISO and SLC pull-up resistors have to be connected to the SPI lines? I assumed that the lines are comparable to the UART, so no pull up's are required.

I have hardly found any answers to this question on the web.

BR
Andreas

Evert :-) · Joined: 18 Feb 2005 Posts: 2156

The spi bus Mosi, Miso slc is driven with push-pull transistors, so no pull are required.
Busses like i2c are using open collector driver and needs pull up resistor.

https://rheingoldheavy.com/spi-basics/

andrge · Joined: 26 Oct 2011 Posts: 30 Location: Kaufbeuren

Hello Evert,

thenak you for your statement. Ihen I have already understood it correctly.
It is the first time that i use SPI for write and read a eeprom.

BR
Andreas