Subversion Repositories openrisc_2011-10-31

/*
  These are just some useful macros that control the TS-1325's
  LEDs and push-button switch. Useful for debugging.

  NOTE: This *must* be 16-bit compatible code to work in start.s
        
  Tony Ambardar
*/

        .macro  LED_OFF
        movw    $P1LTC, dx
        inb     dx,     al
        orb     $0b01000000,    al
        andb    $0b11011111,    al
        outb    al,     dx
        .endm

        .macro  LED_GREEN
        movw    $P1LTC, dx
        inb     dx,     al
        orb     $0b01100000,    al
        outb    al,     dx
        .endm

        .macro  LED_YELLOW
        movw    $P1LTC, dx
        inb     dx,     al
        orb     $0b00100000,    al
        andb    $0b10111111,    al
        outb    al,     dx
        .endm

        .macro  LED_RED
        movw    $P1LTC, dx
        inb     dx,     al
        andb    $0b10011111,    al
        outb    al,     dx
        .endm

        .macro  WAIT_BUTTON     # Wait till the button is pressed for a bit.
        movw    $P1PIN, dx      # ~25-30 cycles per loop, 25MHz -> 1 sec.
        movl    $300000,ecx    # "Timer" count determines how long.
0:      inb     dx,     al
        andb    $0b00000001,al
        jnz     0b              # Button pressed?
        decl    ecx
        jnz     0b              # CX count expired?
        .endm