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Manikanta123's avatar
Manikanta123
Icon for New Contributor rankNew Contributor
4 years ago

Unable to read data from h2f_master port from HPS linux

Hai Team, I'm using Agilex board and trying to interface Axi4Lite IP to HPS via h2f_master port and wrote small application in linux to read from h2f_master port but we are unable to read data ...
tehjingy_Altera's avatar
tehjingy_Altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

HI Manikanta123


In the linux program that you are using how are you reading the memory mapped address?

What address value that you are reading from?


Regards

Jingyang, Teh


Manikanta123's avatar
Manikanta123
Icon for New Contributor rankNew Contributor
4 years ago

Hai Jingyang,

We have memory mapped the total address range using mmap function and we are reading from those addresses with the help of below function

unsigned int read_dma(unsigned int *virtual_addr, int offset)
{
return virtual_addr[offset>>2];
}

We are reading from base address of that IP + 0x10 ,when we are reading the value from that address ,it is always show showing zeros.

Regards,

Manikanta