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annotate gsm-fw/lldbg/serio.S @ 993:d92e4aadeeb3

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target-utils/c139explore: a cleaner way of setting the fixed UART base address
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 22:12:35 +0000
parents f5affe83ba2d
children
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rev   line source
865
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1 #include "../include/config.h"
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2 #include "ns16550.h"
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3
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4 /* this module implements the elementary serial I/O operations */
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5
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6 .text
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7 .code 32
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8 .globl lldbg_serial_out
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9 lldbg_serial_out:
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10 ldr r2, =CONFIG_LLDBG_UART_BASE
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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 .globl lldbg_serial_in_poll
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18 lldbg_serial_in_poll:
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19 ldr r2, =CONFIG_LLDBG_UART_BASE
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20 ldrb r3, [r2, #NS16550_LSR]
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21 tst r3, #NS16550_LSR_DR
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22 ldrneb r0, [r2, #NS16550_RBR]
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23 mvneq r0, #0
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24 bx lr
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25
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26 #if 0 // not needed currently
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27 .globl lldbg_serial_flush
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28 lldbg_serial_flush:
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29 ldr r2, =CONFIG_LLDBG_UART_BASE
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30 1: ldrb r3, [r2, #NS16550_LSR]
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31 tst r3, #NS16550_LSR_TEMP
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32 beq 1b
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33 bx lr
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34 #endif