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Annotation of xinu/h/sluaccess7201.h, revision 1.1.1.1

1.1       root        1: /* sluaccess7201.h */
                      2: /* assumes inclusion of slu7201.h */
                      3: /* The specific chip is the NEC7201A dual UART */
                      4: 
                      5: /* get/set_control_reg7201 and slu_init7201 are in the SA and Xinu libraries.
                      6:    get/set_control_reg7201 provide an effectively-readable UART control
                      7:    register set even though the hardware SLU, a NEC 7201A,
                      8:    has 5 write-only control regs.  They simply maintain a copy of the bits
                      9:    put into the control reg in a private memory location and supply them
                     10:    via get_control_reg.  Naturally, this system only works if all accesses
                     11:    to the hardware control reg. go through this package. */
                     12: 
                     13: #define sluinitcsr(ioaddr)    slu_init7201(ioaddr)
                     14: #define slutransready(ioaddr)      ((ioaddr->cstat)&SLUTRANSREADY)
                     15: #define slurecvready(ioaddr)       ((ioaddr->cstat)&SLURECVREADY)
                     16: #define slugetch(ioaddr)       (((ioaddr)->cbuf)&SLUCHMASK)
                     17: #define sluputch(ioaddr, ch)   ((ioaddr)->cbuf = (ch))
                     18: #define slurenable(ioaddr)   set_control_reg7201(ioaddr,get_control_reg7201(ioaddr,1)|SLURECVIE,1)
                     19: #define slurdisable(ioaddr)  set_control_reg7201(ioaddr,get_control_reg7201(ioaddr,1)&~SLURECVIE,1)
                     20: /* reenable trans ints if nec, start output with null-- */
                     21: #define slutenable(ioaddr) slu_tstart7201(ioaddr)
                     22: #define slutdisable(ioaddr)  set_control_reg7201(ioaddr,get_control_reg7201(ioaddr,1)&(~SLUTRANSIE),1)
                     23: /* unimplemented-- */
                     24: #define slusetbrk(ioaddr)
                     25: #define slurstbrk(ioaddr)
                     26: #define slugetintstate(ioaddr) get_control_reg7201(ioaddr,1)&SLUINTBITS
                     27: #define slusetintstate(ioaddr,oldstate) set_control_reg7201(ioaddr,oldstate| \
                     28:    (get_control_reg7201(ioaddr,1)&~SLUINTBITS),1)
                     29: 

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