Hello,

 

I am working with a Nanopi Neo Air incorporating the System on Chip Allwinner H3. I need to establish a serial communication via the SPI bus, to do this I am looking for some information related to the SPI bus.

 

Can you help me to know the following information please:

 

- What are the min and max SPI bus frequencies that I can use with the Nanopi Neo Air (Allwinner H3)? How can I calculate them?  And are there specific frequency values to use (meaning the relationship is not linear, for example: 3.84MHz, 4.34MHz, etc)?

 

- Can the Nanopi Neo Air be configured as an SPI bus master and as a slave (not at the same time) or only as a master?

 

- What is the maximum number of bits that we can send via the SPI bus per second? If there are several, can you please specify them?

 

Thank you very much in advance.

 

Best regards,

Rami

1 hour ago, Rami said:

only as a master?

Although hardware is "slave" capable, the linux kernel driver is not capable.

On 3/31/2020 at 2:22 PM, martinayotte said:

Although hardware is "slave" capable, the linux kernel driver is not capable.

Hello,

 

Thank you for your response.

 

Can you help me find the answers to the other questions please?

 

Best regards,

Rami. 

2 hours ago, Rami said:

Can you help me find the answers to the other questions please?

Some answers could be found here : https://linux-sunxi.org/SPIdev

 

Maybe you could details what you wish to accomplish ...