Forum Discussion

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

How can i know which part of the SDRAM is not used?

Hi,everyone!:p i am using one altera board with a 16mbits SDRAM, I am practicing DMA transfer when this question came to me : there are some part of the memory is used(in fact a lot of it, my p...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I also met the same problem. I used twice the function "alt_dma_txchan_ioctl()" to makesure the data transferring in units of 8 bits and set a DMA receiver into streaming mode.

array：volatile char chr[20] = "abcdefghihklmnopqrsq" ;//数据源

And I can just receive five datas: aeimq

When the data type of the array is alt_u32,and the transfer length is 80, I can receive all the letters from the UART.

Who can tell me why?