initialize dma controller
Posted: Fri Jun 20, 2003 7:52 am
Hi. I am trying to set up the dma controller to read a sector (512 bytes) from a floppy disk. Assuming all of the following steps are executed correctly, is this all i need to do to set up and begin to use the dma controller? or is there more that needs to be done?
1. enable dma controller
2. mask channel 2
3. reset flip-flop/byte counter
4. write byte0 (0x00) of starting address
5. write byte1 (0x00) of starting address
6. write byte2 (0x20) of starting address to page register of dma channel 2
7. reset flip-flop/byte counter
8. write byte0 (0xFF) of starting count
9. write byte1 (0x01) of starting count
10. initialize mode register for single read, auto-initialization dma
11. unmask channel 2
im not sure that this is working, are there any things to watch out for? how about interrupts? do they need to be disabled to do all of these steps?
Thanks!
1. enable dma controller
2. mask channel 2
3. reset flip-flop/byte counter
4. write byte0 (0x00) of starting address
5. write byte1 (0x00) of starting address
6. write byte2 (0x20) of starting address to page register of dma channel 2
7. reset flip-flop/byte counter
8. write byte0 (0xFF) of starting count
9. write byte1 (0x01) of starting count
10. initialize mode register for single read, auto-initialization dma
11. unmask channel 2
im not sure that this is working, are there any things to watch out for? how about interrupts? do they need to be disabled to do all of these steps?
Thanks!