Wrong SDIO settings? f_read fil only half array counts full array

[GIkar]

Hello,

which points of SDIO (DMA) settings i have to look for if my f_read reads only half but counts full.

Example:

uint16_t buffer1[1024];

f_read(&file,&buffer1[0],1024,&cnt);  

buffer1 is filled with values to buffer1[511] but variable cnt gives me 1024

f_read(&file,&wavbuffer1[0],512,&cnt);  

buffer1 is filled with values to buffer1[255] but variable cnt gives me 512

Thanks for ideas 🙂

[Tesla DeLorean]

uint16_t buffer1[1024]; contains 2048 bytes

[GIkar]

Thank you very much. Is this because of the 32bit arch?

[berendi]

It is because one byte contains 8 bits, so uint16_t a.k.a 16 bit unsigned integer type is 2 bytes.

[Tesla DeLorean]

No

uint32_t buffer2[1024]; would have a sizeof() 4096 bytes, you have 1024 elements in the array and each is 4-bytes in size