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about memory mapped register

Jim Green1
Prodigy 40 points

I/O space is used to acess the registers of the on-chip peripherals. so what is the defference of the memory mapped register and I/O space registers???

thank you for your time . I am just wondering.

  • 0
    TI__Mastermind 23785 points

    Simply put it, IO space registers can be accessed early, say in GEL file, to setup the memory space for access afterward. Like thiese statements from GL file to config the SDRAM:

     *(short *)0x1c00@IO=0x2<<8;  // Select GPIO0 in I2S
     *(short *)0x1c06@IO=0x1; //Set GPIO0 as output
     *(short *)0x1c0A@IO=0x0; //Set GPIO0 = 1

    Hope this help.