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finished lab 3

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This commit is contained in:
Trevor Barnes
2019-10-22 11:34:22 -05:00
parent d038cd8ee3
commit 5723965f38
27 changed files with 7345 additions and 1902 deletions
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141
lab4lcd/.cproject Normal file
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lab4lcd/.gitignore vendored Normal file
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/Debug/

28
lab4lcd/.project Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
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<comment></comment>
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27
lab4lcd/.settings/language.settings.xml Normal file
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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202
lab4lcd/LinkerScript.ld Normal file
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/*
******************************************************************************
**
** File : LinkerScript.ld
**
** Author : Auto-generated by Ac6 System Workbench
**
** Abstract : Linker script for STM32F446RETx Device from STM32F4 series
** 128Kbytes RAM
** 512Kbytes ROM
**
** Set heap size, stack size and stack location according
** to application requirements.
**
** Set memory bank area and size if external memory is used.
**
** Target : STMicroelectronics STM32
**
** Distribution: The file is distributed “as is,” without any warranty
** of any kind.
**
*****************************************************************************
** @attention
**
** <h2><center>&copy; COPYRIGHT(c) 2019 Ac6</center></h2>
**
** Redistribution and use in source and binary forms, with or without modification,
** are permitted provided that the following conditions are met:
** 1. Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright notice,
** this list of conditions and the following disclaimer in the documentation
** and/or other materials provided with the distribution.
** 3. Neither the name of Ac6 nor the names of its contributors
** may be used to endorse or promote products derived from this software
** without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************************
*/
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = 0x20020000; /* end of RAM */
_Min_Heap_Size = 0; /* required amount of heap */
_Min_Stack_Size = 0x400; /* required amount of stack */
/* Memories definition */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K
ROM (rx) : ORIGIN = 0x8000000, LENGTH = 512K
}
/* Sections */
SECTIONS
{
/* The startup code into ROM memory */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >ROM
/* The program code and other data into ROM memory */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >ROM
/* Constant data into ROM memory*/
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >ROM
.ARM.extab : {
. = ALIGN(4);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(4);
} >ROM
.ARM : {
. = ALIGN(4);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(4);
} >ROM
.preinit_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
} >ROM
.init_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
} >ROM
.fini_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
} >ROM
/* Used by the startup to initialize data */
_sidata = LOADADDR(.data);
/* Initialized data sections into RAM memory */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> ROM
/* Uninitialized data section into RAM memory */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss secion */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >RAM
/* User_heap_stack section, used to check that there is enough RAM left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM
/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}

20
lab4lcd/NUCLEO-F446RE.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE targetDefinitions [
<!ELEMENT targetDefinitions (board)>
<!ELEMENT board (name, dbgIF+, dbgDEV, mcuId)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT dbgIF (#PCDATA)>
<!ELEMENT dbgDEV (#PCDATA)>
<!ELEMENT mcuId (#PCDATA)>
<!ATTLIST board id CDATA #REQUIRED>
]>
<targetDefinitions>
<board id="nucleo-f446re">
<name>NUCLEO-F446RE</name>
<dbgIF>SWD</dbgIF>
<dbgIF>JTAG</dbgIF>
<dbgDEV>ST-Link</dbgDEV>
<mcuId>stm32f446retx</mcuId>
</board>
</targetDefinitions>

28
lab4lcd/lab4lcd Debug.cfg Normal file
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# This is an NUCLEO-F446RE board with a single STM32F446RETx chip
#
# Generated by System Workbench for STM32
# Take care that such file, as generated, may be overridden without any early notice. Please have a look to debug launch configuration setup(s)
source [find interface/stlink.cfg]
set WORKAREASIZE 0x8000
transport select "hla_swd"
set CHIPNAME STM32F446RETx
# Enable debug when in low power modes
set ENABLE_LOW_POWER 1
# Stop Watchdog counters when halt
set STOP_WATCHDOG 1
# STlink Debug clock frequency
set CLOCK_FREQ 4000
# use hardware reset, connect under reset
# connect_assert_srst needed if low power mode application running (WFI...)
reset_config srst_only srst_nogate connect_assert_srst
set CONNECT_UNDER_RESET 1
source [find target/stm32f4x.cfg]

59
lab4lcd/src/delay.s Normal file
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# delay.s
# Trevor Barnes
# CE2801-031
# Description: A file for handling delay routines
.syntax unified
.cpu cortex-m4
.thumb
.section .text
.global delay_ms
# A subroutine to create a delay of a certain number of milliseconds
# Input:
# r0: Length of delay (ms)
delay_ms:
push {r1,r2,r3,lr}
mov r3,r0
ms_delay:
# 250 iterations = 1/16 of a millisecond
mov r2, #0x10
# Loop 16 times
1:
# 250
mov r1, #0xFA
# Loop 250 times
2:
sub r1, #1
cmp r1, #0
bne 2b
sub r2, #1
cmp r2, #0
bne 1b
sub r0, #1
cmp r0, #0
bne ms_delay
mov r0,r3
pop {r1,r2,r3,pc}
.global lcd_delay
# about r1 mircoseonds
lcd_delay:
# stack
push {lr}
lsl r1, r1, #3
1:
sub r1, r1, #1
cmp r1, #0
bne 1b
# return
pop {pc}

464
lab4lcd/src/lcd.s Normal file
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# lcd.s
# Trevor Barnes
# CE2801-031
# Description:
.syntax unified
.cpu cortex-m4
.thumb
.section .text
#Fill in addresses
.equ RCC_BASE, 0x40023800
.equ RCC_AHB1ENR, 0x30
.equ RCC_GPIOAEN, 1<<0
.equ RCC_GPIOCEN, 1<<2
.equ GPIOA_BASE, 0x40020000
.equ GPIOC_BASE, 0x40020800
.equ GPIO_MODER, 0x00
.equ GPIO_ODR, 0x14
.equ GPIO_IDR, 0x10
.equ GPIO_BSRR, 0x18
#What pin is each of these?
.equ RS, 8 // PC8
.equ RW, 9 // PC9
.equ E, 10 // PC10
#Commands for BSRR
.equ RS_SET, 1<<RS
.equ RS_CLR, 1<<(RS+16)
.equ RW_SET, 1<<RW
.equ RW_CLR, 1<<(RW+16)
.equ E_SET, 1<<E
.equ E_CLR, 1<<(E+16)
#Globally exposed functions
.global lcdInit
#Local helper function
PortSetup:
push {r1,r2,r3}
#Turn on Ports in RCC
ldr r1, =RCC_BASE
ldr r2, [r1, #RCC_AHB1ENR]
orr r2, r2, #RCC_GPIOAEN
str r2, [r1, #RCC_AHB1ENR]
ldr r2, [r1, #RCC_AHB1ENR]
orr r2, r2, #RCC_GPIOCEN
str r2, [r1, #RCC_AHB1ENR]
#Set DB Pins to Outputs
ldr r1, =GPIOA_BASE
ldr r2, [r1, #GPIO_MODER]
movw r3, 0x5500
movt r3, 0x0055
orr r2,r2, r3
movw r3, 0xAA00
movt r3, 0x00AA
bic r2, r2, r3
str r2, [r1, #GPIO_MODER]
#Set RS RW E Pins to Outputs
ldr r1, =GPIOC_BASE
ldr r2, [r1, #GPIO_MODER]
movw r3, 0x0000
movt r3, 0x0015
orr r2,r2, r3
movw r3, 0x0000
movt r3, 0x00EA
bic r2, r2, r3
str r2, [r1, #GPIO_MODER]
pop {r1,r2,r3}
bx lr
#Writes instruction
#RS=0 RW=0 R1-Arg
#No returns
WriteInstruction:
push {r2,r3,lr}
#Set RS=0,RW=0,E=0
ldr r2, =GPIOC_BASE
mov r3, RS_CLR
str r3, [r2, #GPIO_BSRR]
mov r3, RW_CLR
str r3, [r2, #GPIO_BSRR]
mov r3, E_CLR
str r3, [r2, #GPIO_BSRR]
#Set E=1
mov r3, E_SET
str r3, [r2, #GPIO_BSRR]
#Set R1 -> DataBus
lsl r1, #4
ldr r3, =GPIOA_BASE
ldr r2, [r3, #GPIO_ODR]
bfc r2, #4, #8
orr r2, r2, r1
str r2, [r3, #GPIO_ODR ]
#Set E=0
ldr r2, =GPIOC_BASE
mov r3, E_CLR
str r3, [r2, #GPIO_BSRR]
#Wait for appropriate delay
mov r1, #37
bl lcd_delay
pop {r2,r3,pc}
#Writes data
#RS=0 RW=0 R1-Arg
#No returns
WriteData:
push {r1,r2,r3,r4,lr}
#Set RS=1,RW=0,E=0
ldr r2, =GPIOC_BASE
mov r3, #RS_SET
str r3, [r2, #GPIO_BSRR]
mov r3, #RW_CLR
str r3, [r2, #GPIO_BSRR]
mov r3, #E_CLR
str r3, [r2, #GPIO_BSRR]
#Set E=1
mov r3, #E_SET
str r3, [r2, #GPIO_BSRR]
#Set R1 -> DataBus
lsl r1, #4
ldr r3, =GPIOA_BASE
ldr r2, [r3, #GPIO_ODR]
bfc r2, #4, #8
orr r2, r2, r1
str r2, [r3, #GPIO_ODR ]
#Set E=0
ldr r2, =GPIOC_BASE
mov r3, #E_CLR
str r3, [r2, #GPIO_BSRR]
#Wait for appropriate delay
mov r1, #37
bl lcd_delay
pop {r1,r2,r3,r4,pc}
#Code to intialize the lcd
lcdInit:
push {r0,r1,lr}
#Set up Ports
bl PortSetup
#Wait 40ms
mov r0, #40
bl delay_ms
#Write Function Set (0x38)
mov r1, 0x38
bl WriteInstruction
mov r1, #37
bl lcd_delay
#Write Function Set (0x38)
mov r1, 0x38
bl WriteInstruction
mov r1, #37
bl lcd_delay
#Write Display On/Off(0x0F)
mov r1, 0x0F
bl WriteInstruction
mov r1, #37
bl lcd_delay
#Write Display Clear (0x01)
mov r1, 0x01
bl WriteInstruction
mov r1, #2
bl delay_ms
#Write Entry Mode Set (0x06)
mov r1, 0x06
bl WriteInstruction
mov r1, #37
bl lcd_delay
pop {r0,r1,pc}
.global lcdClear
# clears the display
# no arguments or return
# includes necessary delay
lcdClear:
push {r0,lr}
mov r1, 0x01
bl WriteInstruction
# Delay for at least 1.52ms
mov r0, #2
bl delay_ms
pop {r0,pc}
.global lcdHome
# moves cursor to the home position
# no arguments or return
# includes necessary delay
lcdHome:
push {r1,lr}
mov r1, #0x02
bl WriteInstruction
mov r0, #2
bl delay_ms
pop {r1,pc}
.global lcdSetPosition
# moves cursor to the position indicated
# r0 is the zero-based row and r1 is the zero-based column, no return value
# includes necessary delay
lcdSetPosition:
push {r0,r1,lr}
# Sub values to "actual" positions
sub r0, r0, #1
sub r1, r1, #1
# Shift row to actual
lsl r0, r0, #6
orr r0, r0, r1
mov r1, #0x80
orr r1, r1, r0
bl WriteInstruction
pop {r0,r1,pc}
.global lcdPrintString
# prints a null terminated string to the display
# r0 contains the address of the null terminated string (usually located in .data or .rodata), returns the number of characters written to display in r0
# includes necessary delay
lcdPrintString:
push {r0,r1,r2,r3,lr}
mov r2, #0
loop:
ldrb r1, [r0, r2]
cmp r1, #0x00
beq done
bl WriteData
add r2, r2, #1
b loop
done:
mov r0, r1
pop {r0,r1,r2,r3,pc}
.global lcdPrintNum
# prints a (decimal) number to the display
# the number to be printed is in r0, values of 0 to 9999 will print, anything above 9999 should print Err.
# includes necessary delay
lcdPrintNum:
push {r0,r1,r2,r3,r4,lr}
bl num_to_ASCII
# Store num in memory
ldr r2, =numToPrint
str r0, [r2]
# Move cursor to right-most position
mov r1, #16
writeByte:
mov r0, #1
bl lcdSetPosition
mov r4, r0
mov r0, #1
bl delay_ms
mov r0, r4
mov r0, r1
ldrb r1, [r2, r3]
bl WriteData
mov r4, r0
mov r0, #1
bl delay_ms
mov r0, r4
add r3, r3, #1
cmp r3, #4
sub r1, r0, #1
cmp r3, #4
bne writeByte
pop {r0,r1,r2,r3,r4,pc}
# Takes in a value from 0-9999 and converts it to ASCII
# Input:
# r0: Input binary value
num_to_ASCII:
# If outside of range, return ASCII "Err."
push {r1,r2,r3,lr}
cmp r0,#0
blt out_of_range
# cmp r0,#9999
# bgt out_of_range
# Normal conversion behavior
mov r1, #16
lsl r0, #3
sub r1, #3
shift_cycle:
lsl r0, #1
sub r1, #1
cmp r1, #0
# Branch to encode section if shifted 16 times
beq encode
# Verify Each Nibble is less than or equal to 4
ubfx r2, r0, #16, #4
# If value is less than or equal to 4, then skip to next nibble
cmp r2, #4
ble 2f
add r2, #3
bfi r0, r2, #16, #4
2: ubfx r2, r0, #20, #4
# If value is less than or equal to 4, then skip to next nibble
cmp r2, #4
ble 3f
add r2, #3
bfi r0, r2, #20, #4
3: ubfx r2, r0, #24, #4
# If value is less than or equal to 4, then skip to next nibble
cmp r2, #4
ble 4f
add r2, #3
bfi r0, r2, #24, #4
4: ubfx r2, r0, #28, #4
# If value is less than or equal to 4 skip to end
cmp r2, #4
ble end_verify_nibbles
add r2, #3
bfi r0, r2, #28, #4
end_verify_nibbles:
b shift_cycle
encode:
mov r3, #3
# Encode BCD numbers to ASCII
# Extract ones nibble
ubfx r2, r0, #16, #4
# Insert ones nibble
bfi r1, r2, #0, #4
# Insert 3 in front of nibble for ASCII encoding
bfi r1, r3, #4, #4
# Extract tens nibble
ubfx r2, r0, #20, #4
# Insert tens nibble
bfi r1, r2, #8, #4
# Insert 3 in front of nibble for ASCII encoding
bfi r1, r3, #12, #4
# Extract hundreds nibble
ubfx r2, r0, #24, #4
# Insert hundreds nibble
bfi r1, r2, #16, #4
# Insert 3 in front of nibble for ASCII encoding
bfi r1, r3, #20, #4
# Extract thousands nibble
ubfx r2, r0, #28, #4
# Insert thousands nibble
bfi r1, r2, #24, #4
# Insert 3 in front of nibble for ASCII encoding
bfi r1, r3, #28, #4
b end_ASCII
out_of_range:
# Insert ASCII "Err."
movw r1, #0x722E
movt r1, #0x4572
end_ASCII:
# Return value in r0
mov r0, r1
pop {r1,r2,r3,pc}
.global lcdBusyWait
# Loops until the busy flag is 0
lcdBusyWait:
push {r0,r1,r2,r3,lr}
ldr r1, =GPIOA_BASE
ldr r2, [r1, #GPIO_MODER]
mov r3, #0
orr r2, r2, r3
movw r3, 0xFF00
movt r3, 0x00FF
bic r2, r2, r3
str r2, [r1, #GPIO_MODER]
#Set RS=0, RW=1, E=1
ldr r2, =GPIOC_BASE
mov r3, #RS_CLR
str r3, [r2, #GPIO_BSRR]
mov r3, #RW_SET
str r3, [r2, #GPIO_BSRR]
mov r3, #E_SET
str r3, [r2, #GPIO_BSRR]
busy:
#Set E=
mov r3, #E_SET
str r3, [r2, #GPIO_BSRR]
#Set Databus -> R1
ldr r3, =GPIOA_BASE
ldr r1, [r3, #GPIO_IDR]
#Set E=0
ldr r2, =GPIOC_BASE
mov r3, #E_CLR
str r3, [r2, #GPIO_BSRR]
mov r2, #0x0010
and r1, r2
lsr r1, #4
# Are we still busy?
cmp r1, #1
beq busy
# Return DB port to original mode
ldr r1, =GPIOA_BASE
ldr r2, [r1, #GPIO_MODER]
movw r3, 0x5500
movt r3, 0x0055
orr r2,r2, r3
movw r3, 0xAA00
movt r3, 0x00AA
bic r2, r2, r3
str r2, [r1, #GPIO_MODER]
pop {r0,r1,r2,r3,pc}
.section .data
numToPrint:
.word 0

57
lab4lcd/src/main.s Normal file
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# main.s
# Trevor Barnes
# CE2801-031
# Lab 3: LCD API
# Description: The driver for Lab 4. Displays the ASCII
# values from the previous lab.
.syntax unified
.cpu cortex-m4
.thumb
.section .text
.global main
main:
bl lcdInit
mov r0, #10
bl countDown
bl lcdClear
ldr r0, =msg
bl lcdPrintString
end:
b end
# r0 - value to be counted down from (0-9999)
countDown:
push {r0,r1,lr}
loop:
# Print number
bl lcdPrintNum
mov r1, r0
mov r0, #1
# Save current value before delay subroutine
bl lcdHome
mov r0, #1000
bl delay_ms
mov r0, r1
cmp r0, #0
beq done
sub r0, r0, #1
b loop
done:
pop {r0,r1,pc}
.section .rodata
msg:
.asciz "Hello World!"

246
lab4lcd/startup/startup_stm32.s Normal file
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/**
******************************************************************************
* @file startup_stm32.s
* @author Ac6
* @version V1.0.0
* @date 12-June-2014
******************************************************************************
*/
.syntax unified
.cpu cortex-m4
.thumb
.global g_pfnVectors
.global Default_Handler
/* start address for the initialization values of the .data section.
defined in linker script */
.word _sidata
/* start address for the .data section. defined in linker script */
.word _sdata
/* end address for the .data section. defined in linker script */
.word _edata
/* start address for the .bss section. defined in linker script */
.word _sbss
/* end address for the .bss section. defined in linker script */
.word _ebss
.equ BootRAM, 0xF1E0F85F
/**
* @brief This is the code that gets called when the processor first
* starts execution following a reset event. Only the absolutely
* necessary set is performed, after which the application
* supplied main() routine is called.
* @param None
* @retval : None
*/
.section .text.Reset_Handler
.weak Reset_Handler
.type Reset_Handler, %function
Reset_Handler:
/* Copy the data segment initializers from flash to SRAM */
movs r1, #0
b LoopCopyDataInit
CopyDataInit:
ldr r3, =_sidata
ldr r3, [r3, r1]
str r3, [r0, r1]
adds r1, r1, #4
LoopCopyDataInit:
ldr r0, =_sdata
ldr r3, =_edata
adds r2, r0, r1
cmp r2, r3
bcc CopyDataInit
ldr r2, =_sbss
b LoopFillZerobss
/* Zero fill the bss segment. */
FillZerobss:
movs r3, #0
str r3, [r2]
adds r2, r2, #4
LoopFillZerobss:
ldr r3, = _ebss
cmp r2, r3
bcc FillZerobss
/* Call the clock system intitialization function.*/
bl SystemInit
/* Call static constructors */
bl __libc_init_array
/* Call the application's entry point.*/
bl main
LoopForever:
b LoopForever
.size Reset_Handler, .-Reset_Handler
/**
* @brief This is the code that gets called when the processor receives an
* unexpected interrupt. This simply enters an infinite loop, preserving
* the system state for examination by a debugger.
*
* @param None
* @retval : None
*/
.section .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
b Infinite_Loop
.size Default_Handler, .-Default_Handler
/******************************************************************************
*
* The minimal vector table for a Cortex-M. Note that the proper constructs
* must be placed on this to ensure that it ends up at physical address
* 0x0000.0000.
*
******************************************************************************/
.section .isr_vector,"a",%progbits
.type g_pfnVectors, %object
.size g_pfnVectors, .-g_pfnVectors
g_pfnVectors:
.word _estack
.word Reset_Handler
.word NMI_Handler
.word HardFault_Handler
.word MemManage_Handler
.word BusFault_Handler
.word UsageFault_Handler
.word 0
.word 0
.word 0
.word 0
.word SVC_Handler
.word DebugMon_Handler
.word 0
.word PendSV_Handler
.word SysTick_Handler
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
.word 0
/*******************************************************************************
*
* Provide weak aliases for each Exception handler to the Default_Handler.
* As they are weak aliases, any function with the same name will override
* this definition.
*
*******************************************************************************/
.weak NMI_Handler
.thumb_set NMI_Handler,Default_Handler
.weak HardFault_Handler
.thumb_set HardFault_Handler,Default_Handler
.weak MemManage_Handler
.thumb_set MemManage_Handler,Default_Handler
.weak BusFault_Handler
.thumb_set BusFault_Handler,Default_Handler
.weak UsageFault_Handler
.thumb_set UsageFault_Handler,Default_Handler
.weak SVC_Handler
.thumb_set SVC_Handler,Default_Handler
.weak DebugMon_Handler
.thumb_set DebugMon_Handler,Default_Handler
.weak PendSV_Handler
.thumb_set PendSV_Handler,Default_Handler
.weak SysTick_Handler
.thumb_set SysTick_Handler,Default_Handler
.weak SystemInit
/************************ (C) COPYRIGHT Ac6 *****END OF FILE****/

82
lab4lcd/startup/sysmem.c Normal file
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/**
*****************************************************************************
**
** File : sysmem.c
**
** Author : Ac6
**
** Abstract : System Workbench Minimal System Memory calls file
**
** For more information about which c-functions
** need which of these lowlevel functions
** please consult the Newlib libc-manual
**
** Environment : System Workbench for MCU
**
** Distribution: The file is distributed “as is,” without any warranty
** of any kind.
**
*****************************************************************************
**
** <h2><center>&copy; COPYRIGHT(c) 2014 Ac6</center></h2>
**
** Redistribution and use in source and binary forms, with or without modification,
** are permitted provided that the following conditions are met:
** 1. Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright notice,
** this list of conditions and the following disclaimer in the documentation
** and/or other materials provided with the distribution.
** 3. Neither the name of Ac6 nor the names of its contributors
** may be used to endorse or promote products derived from this software
** without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************************
*/
/* Includes */
#include <errno.h>
#include <stdio.h>
/* Variables */
extern int errno;
register char * stack_ptr asm("sp");
/* Functions */
/**
_sbrk
Increase program data space. Malloc and related functions depend on this
**/
caddr_t _sbrk(int incr)
{
extern char end asm("end");
static char *heap_end;
char *prev_heap_end;
if (heap_end == 0)
heap_end = &end;
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr)
{
errno = ENOMEM;
return (caddr_t) -1;
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}