FreeCalypso > hg > freecalypso-sw

annotate target-utils/libbase/serio.S @ 992:a7b0b426f9ca

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target-utils: boot ROM UART autodetection revamped The new implementation should work with both the familiar Calypso C035 boot ROM version found in our regular targets as well as the older Calypso F741979B version found on the vintage D-Sample board.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 21:28:41 +0000
parents 5cff3579814c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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da98dc08f575 loadagent: beginning to lay the foundation
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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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a7b0b426f9ca target-utils: boot ROM UART autodetection revamped
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5 .comm uart_base,4,4
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7 .text
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8 .code 32
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9 .global serial_out
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10 serial_out:
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11 ldr r1, =uart_base
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12 ldr r2, [r1]
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13 1: ldrb r3, [r2, #NS16550_LSR]
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14 tst r3, #NS16550_LSR_THRE
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15 beq 1b
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16 strb r0, [r2, #NS16550_THR]
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17 bx lr
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18
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19 .global serial_in_poll
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20 serial_in_poll:
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21 ldr r1, =uart_base
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22 ldr r2, [r1]
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23 ldrb r3, [r2, #NS16550_LSR]
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24 tst r3, #NS16550_LSR_DR
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25 ldrneb r0, [r2, #NS16550_RBR]
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26 mvneq r0, #0
1
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27 bx lr
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28
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29 .global serial_flush
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30 serial_flush:
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31 ldr r1, =uart_base
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32 ldr r2, [r1]
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33 1: ldrb r3, [r2, #NS16550_LSR]
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34 tst r3, #NS16550_LSR_TEMP
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35 beq 1b
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36 bx lr