1 ###############################################################################
3 # Copyright (c) 2011, GraÅžvydas Ignotas
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions are met:
8 # * Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
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13 # * Neither the name of the organization nor the
14 # names of its contributors may be used to endorse or promote products
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17 # THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND ANY
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29 # --register-prefix-optional --bitwise-or
38 # receive 1 byte to d0
41 .macro recv_one_byte is_last=0
42 move.b #0,(a1) /* clear TH */
47 bne 0b /*L_wait_tl_low*/
49 move.b #0x40,(a1) /* set TH */
55 beq 0b /*L_wait_tl_hi*/
58 move.b #0,(a1) /* clear TH - ready for next */
74 bne 0b /*Lwait_tl_low*/
76 move.b d2,(a1) /* clears TH and writes data */
80 bset.b #6,d2 /* prepare TH */
85 beq 0b /*wait_tl_hi1*/
95 # receive address/size to d0 (3 bytes BE)
114 move.b #0x40,(0xa1000b).l /* ctrl - all inputs except TH */
129 lea (jumptab,pc,d0),a0
132 bra pcc_transfer_recv /* sent to us */
133 bra pcc_transfer_send /* recv from us */
161 bne 0b /*Lwait_tl_low*/
163 move.b #0x4f,(0xa1000b).l
185 move.b #0,(0xa1000b).l /* all inputs */
187 move.l d0,(a1)+ /* last state for debug */
195 # vim:filetype=asmM68k