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55 lines
2.4 KiB
Plaintext
55 lines
2.4 KiB
Plaintext
PRU Assembler Unix v2.3.1 Sun Mar 31 20:55:28 2019
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Tools Copyright (c) 2012-2017 Texas Instruments Incorporated
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pru0_datout.asmsrc PAGE 1
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1;
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2; pru0_datout.asmsrc: PRU0 loop to copy XFR to GPIO out
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3;
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4; Copyright (c) 2018, Joerg Hoppe
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5; j_hoppe@t-online.de, www.retrocmp.com
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6;
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7; Permission is hereby granted, free of charge, to any person obtaining a
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8; copy of this software and associated documentation files (the "Software"),
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9; to deal in the Software without restriction, including without limitation
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10; the rights to use, copy, modify, merge, publish, distribute, sublicense,
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11; and/or sell copies of the Software, and to permit persons to whom the
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12; Software is furnished to do so, subject to the following conditions:
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13;
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14; The above copyright notice and this permission notice shall be included in
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15; all copies or substantial portions of the Software.
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16;
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17; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20; JOERG HOPPE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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21; IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22; CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23;
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24;
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25; 12-nov-2018 JH entered beta phase
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26;
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27;
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28; Assembler function, which endlessly reads r14 from XFR area
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29; and copies to output pins DATOUT
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30; needs 15ns to loop
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31;
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32; to be declared in C as
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33; extern "C" {
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34; void pru0_dataout(void) ;
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35; }
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36; See Compiler 2.2 Guide, Chapter 6.6
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37
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38 .global pru0_dataout
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39
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40 ; a 32bit parameter is received in r14
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41 ; 10 ns delay
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42 00000000 pru0_dataout:
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43 ; do nothing at first
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44 ; Device ID 14 = "other PRU"
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45 00000000 0000002E87018E xin 14,&r14,4
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46 00000004 00000010EEEEFE mov r30,r14
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47 00000008 00000021000000! jmp pru0_dataout ; never returns
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No Assembly Errors, No Assembly Warnings
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