2268c19171
remove the unused header file and mimic the difference between sub arch Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
112 lines
3.6 KiB
ArmAsm
112 lines
3.6 KiB
ArmAsm
/**************************************************************************
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* arch/arm/src/dm320/dm320_lowputc.S
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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**************************************************************************/
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/**************************************************************************
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* Included Files
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**************************************************************************/
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#include <nuttx/config.h>
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#include "chip.h"
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/**************************************************************************
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* Pre-processor Definitions
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**************************************************************************/
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/**************************************************************************
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* Private Types
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**************************************************************************/
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/**************************************************************************
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* Private Function Prototypes
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**************************************************************************/
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/**************************************************************************
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* Public Data
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**************************************************************************/
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/**************************************************************************
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* Private Data
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**************************************************************************/
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/**************************************************************************
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* Private Functions
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**************************************************************************/
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/**************************************************************************
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* Public Functions
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**************************************************************************/
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/**************************************************************************
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* Name: arm_lowputc
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**************************************************************************/
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/* This assembly language version has the advantage that it can does not
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* require a C stack and uses only r0-r1. Hence it can be used during
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* early boot phases.
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*/
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.text
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.global arm_lowputc
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.type arm_lowputc, function
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arm_lowputc:
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/* On entry, r0 holds the character to be printed */
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#ifdef CONFIG_UART1_SERIAL_CONSOLE
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ldr r2, =DM320_UART1_REGISTER_BASE /* r2=UART1 base */
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#else
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ldr r2, =DM320_UART0_REGISTER_BASE /* r2=UART0 base */
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#endif
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/* Poll the TX fifo trigger level bit of the UART_SSR
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* register. When the bit is non-zero, the TX FIFO is no
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* longer full
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*/
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1: ldrh r1, [r2, #UART_SR]
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tst r1, #UART_SR_TFTI
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beq 1b
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/* Send the character by writing it into the UART_DTRR
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* register.
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*/
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strh r0, [r2, #UART_DTRR]
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/* Wait for the tranmsit register to be emptied. This is
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* determined when TX register empty bit of the SR is zero.
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*/
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2: ldrh r1, [r2, #UART_SR]
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tst r1, #UART_SR_TREF
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bne 2b
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/* If the character that we just sent was a linefeed,
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* then send a carriage return as well.
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*/
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teq r0, #'\n'
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moveq r0, #'\r'
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beq 1b
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/* And return */
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mov pc, lr
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