I am primarily interested in
> s/w interfaces for accesing DDR memory like reading and writing data
> at a particular address
Unless I misunderstand the question:
#include uint32_t addr = 0x00001234; // some address you want to access uint8_t *ptr = (uint8_t *) addr; foo = *ptr; // read a byte at ptr
*ptr = 0xaa; // write a byte 0xaa at ptr
and also writing on-board LEDs and reading DIP
> switches.
Same as above, but put a "volatile" in the pointer declaration:
volatile uint8_t *switches_ptr = (uint8_t *) 0x02000000; volatile uint8_t *leds_ptr = (uint8_t *) 0x03000000; uint8_t switches = *switches_ptr;
*leds_ptr = 0x55;
Of course, you have to change the addresses to match your system.