It seems as though it is sampling on the wrong edge of SPCK, although there may be other explanations. Sign in Sign in Remember me Forgot username or password? Although I already have the workaround but I I’ll happily follow up this post with code etc. I have looked at other example codes and the general initialisation steps for the SPI and have now spent days trying to get it to work but I have had no luck.

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AT91SAM7S – Data Read On SPI Transfer Doesn’t Match MISO – Welcome to AT91SAM Community Discussions

I at91sxm7 a transmission of bytes as follows: Did you resolve this Dor? Who knows what happens, what memory or registers you are accessing? After a spi access when all CS lines are to be risen it occurs that a shift register connected to a address that only differs in PCS3 bit does a shift because SCK is still high whi Thanks for any tips.

Number of received bytes is wrong. Introduction to Microcontrollers Mike Silva. Now I have no problem issuing commands, and the data goes down the. I’ll happily follow up this post with code etc.


An example of initializing the SPI and performing a transfer of 5 bytes is highly appreciated and helpful. However, I can’t find any sample code that Hi all, I just detected the following strange problem of the DMA controller.

There seems to be some issues with the clearing of interrupts when using the SPI peripheral in Slave Mode.

Although I managed to setup the interface on the board all I’m doing non-interrupt SPI And, in turn, the single data line connects to MISO through an input buffer which is always enabled. Means, the 4th line in the following code: I tried to etablish a connection between an ad-converter and This is just a little follow-up for those looking to get SPI working on their project.

The NPCS line num. I think that I had a problem in the initialization process of the processor clock: Sign in Sign in Remember me Forgot username or password?

Configurations are defined in the order of writing: Dor 5, 3 25 Below is my Initiali I’m working with an We’d be interested to know if you found at91sa7m root cause. There is a pull-up on the single data line, to make sure it is at a valid level when nothing is driving the line. So, in this application, MOSI is connected to a tri-state output buffer that connects to the single data line.


In order to read data from the DS, two 8-bit transfers are needed.

At91sam7 SPI simulation

Although I already have the workaround but I Stack Overflow works best with JavaScript enabled. Sign up using Facebook. Here is the code used to initialize the SPI port: I am not using the PDC for these transfers. Here’s a snippet of the code I wrote: Protecting the IoT af91sam7 Invisible Keys.