Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Read float values from file stored on SD Card

Hello all, I have a matrix with float values which I will be saving in a file from Matlab. I have to copy this file to SD Card and read these values using NIOS 2 while running my program. What ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

--- Quote Start ---

Solved the problem myself using fwrite(fid,A,'float32'); in Matlab and using a union of char[4] and float in NIOS, thanks to stackoverflow.com

union {

char chars[4];

float f;

} u;

Read 4 bytes in u.char and use u.f, it will be exactly what's needed.

--- Quote End ---

If the endianess stored in the file by Matlab is the same as NIOS II endianess (it probably it is), you don't need the char[4] array, you can just read and write 4 bytes to and from the address of the float.

BillA