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annotate target-utils/libbase/serio.S @ 991:5cff3579814c

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target-utils: libbase factored out of libcommon The library dependency order is now strictly unidirectional
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 20:48:12 +0000
parents target-utils/libcommon/serio.S@d7591faa1258
children a7b0b426f9ca
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1 #include "ns16550.h"
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2
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3 @ this module implements the elementary serial I/O operations
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4
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5 .text
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6 .code 32
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7 .global serial_out
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8 serial_out:
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9 ldr r1, =uart_base
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10 ldr r2, [r1]
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11 1: ldrb r3, [r2, #NS16550_LSR]
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12 tst r3, #NS16550_LSR_THRE
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13 beq 1b
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14 strb r0, [r2, #NS16550_THR]
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15 bx lr
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16
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17 .global serial_in_poll
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18 serial_in_poll:
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19 ldr r1, =uart_base
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20 ldr r2, [r1]
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21 ldrb r3, [r2, #NS16550_LSR]
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22 tst r3, #NS16550_LSR_DR
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23 ldrneb r0, [r2, #NS16550_RBR]
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24 mvneq r0, #0
1
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25 bx lr
393
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26
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27 .global serial_flush
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28 serial_flush:
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29 ldr r1, =uart_base
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30 ldr r2, [r1]
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31 1: ldrb r3, [r2, #NS16550_LSR]
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32 tst r3, #NS16550_LSR_TEMP
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33 beq 1b
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34 bx lr