FreeCalypso > hg > freecalypso-tools
annotate target-utils/tf-breakin/payload.S @ 823:9092ff68e37d
buzplayer: implement PWT mode melody entry
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 30 May 2021 04:42:05 +0000 |
parents | e7502631a0f9 |
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rev | line source |
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0
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initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 .text |
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Mychaela Falconia <falcon@freecalypso.org>
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2 .org 0 |
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Mychaela Falconia <falcon@freecalypso.org>
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3 |
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Mychaela Falconia <falcon@freecalypso.org>
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4 @ allow entry in Thumb state |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 .code 16 |
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Mychaela Falconia <falcon@freecalypso.org>
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6 bx pc |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 nop |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 |
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Mychaela Falconia <falcon@freecalypso.org>
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9 .code 32 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 |
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Mychaela Falconia <falcon@freecalypso.org>
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11 @ set CPSR like mot931c payload does |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 msr CPSR_c, #0xd3 |
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Mychaela Falconia <falcon@freecalypso.org>
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13 @ disable the watchdog |
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Mychaela Falconia <falcon@freecalypso.org>
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14 ldr r1, =0xfffff802 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 mov r0, #0xf5 |
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Mychaela Falconia <falcon@freecalypso.org>
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16 strh r0, [r1, #2] |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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17 mov r0, #0xa0 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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18 strh r0, [r1, #2] |
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Mychaela Falconia <falcon@freecalypso.org>
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19 @ MODEM UART |
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Mychaela Falconia <falcon@freecalypso.org>
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20 ldr r6, =0xffff5800 |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 @ wait for any previous output to flush out |
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Mychaela Falconia <falcon@freecalypso.org>
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22 1: ldrb r0, [r6, #5] |
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Mychaela Falconia <falcon@freecalypso.org>
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23 tst r0, #0x20 |
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Mychaela Falconia <falcon@freecalypso.org>
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24 beq 1b |
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Mychaela Falconia <falcon@freecalypso.org>
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25 @ send our indication |
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Mychaela Falconia <falcon@freecalypso.org>
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26 adr r1, outstr |
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Mychaela Falconia <falcon@freecalypso.org>
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27 mov r2, #6 |
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Mychaela Falconia <falcon@freecalypso.org>
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28 1: ldrb r0, [r1], #1 |
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Mychaela Falconia <falcon@freecalypso.org>
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29 strb r0, [r6] |
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Mychaela Falconia <falcon@freecalypso.org>
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30 subs r2, r2, #1 |
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Mychaela Falconia <falcon@freecalypso.org>
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31 bne 1b |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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32 @ wait for this output to go out to the TxD pin |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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33 1: ldrb r0, [r6, #5] |
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Mychaela Falconia <falcon@freecalypso.org>
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34 tst r0, #0x40 |
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Mychaela Falconia <falcon@freecalypso.org>
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35 beq 1b |
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Mychaela Falconia <falcon@freecalypso.org>
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36 @ enable the Calypso boot ROM |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
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37 ldr r1, =0xFFFFFB10 |
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Mychaela Falconia <falcon@freecalypso.org>
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38 mov r2, #0x0100 |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
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39 strh r2, [r1] |
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Mychaela Falconia <falcon@freecalypso.org>
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40 @ jump to it! |
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Mychaela Falconia <falcon@freecalypso.org>
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41 mov pc, #0 |
e7502631a0f9
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Mychaela Falconia <falcon@freecalypso.org>
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42 .ltorg |
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Mychaela Falconia <falcon@freecalypso.org>
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43 outstr: .byte 2,2,2,'O','K',2 |