;******************** (C) Yifeng ZHU *******************************************
; @file    startup_stm32l1xx_md.s
; @author  Yifeng Zhu
; @version V2.0.0
; @date    12-17-2014
; @brief   This is a modified startup code to support Assembly Programs without
;          using libraries. Key changes include:
;          (1) Remove the call of SystemInit()
;          (2) Add codes to initialize memory. 
;              Copy the Read/Write data section (RW) and the Zero Initialized 
;              section (ZI) from the flash to RAM
; @note
;          This code is for the book "Embedded Systems with ARM Cortex-M 
;          Microcontrollers in Assembly Language and C, Yifeng Zhu, 
;          ISBN-10: 0982692633.
; @attension
;          This code is provided for education purpose. The author shall not be 
;          held liable for any direct, indirect or consequential damages, for any 
;          reason whatever. More information can be found from book website: 
;          http://www.eece.maine.edu/~zhu/book
;*******************************************************************************


;******************** (C) COPYRIGHT 2010 STMicroelectronics ********************
;* File Name          : startup_stm32l1xx_md.s
;* Author             : MCD Application Team
;* Version            : V1.0.0
;* Date               : 31-December-2010
;* Description        : STM32L1xx Ultra Low Power Medium-density Devices vector 
;*                      table for MDK-ARM toolchain.
;*                      This module performs:
;*                      - Set the initial SP
;*                      - Set the initial PC == Reset_Handler
;*                      - Set the vector table entries with the exceptions ISR address
;*                      - Branches to __main in the C library (which eventually
;*                        calls main()).
;*                      After Reset the CortexM3 processor is in Thread mode,
;*                      priority is Privileged, and the Stack is set to Main.
;* <<< Use Configuration Wizard in Context Menu >>>   
;*******************************************************************************
; THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
; WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
; AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
; INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
; CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
; INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
;*******************************************************************************

; Amount of memory (in bytes) allocated for Stack
; Tailor this value to your application needs
; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

;******************** Added by Dr. Zhu *****************************************************
                ; ROM:  Symbols defined by the linker
                IMPORT  |Load$$ER_IROM1$$Base|             ; Entry of Bootloader
                
                IMPORT  |Image$$ER_IROM1$$RO$$Base|        ; Start of RO output section
                IMPORT  |Image$$ER_IROM1$$RO$$Limit|       ; First byte beyond the end of RO output section
                IMPORT  |Image$$ER_IROM1$$RO$$Length|      ; Size of RO output section
                
                IMPORT  |Image$$ER_IROM1$$RW$$Base|
                IMPORT  |Image$$ER_IROM1$$RW$$Length|
                IMPORT  |Image$$ER_IROM1$$RW$$Limit|
                
                IMPORT  |Image$$ER_IROM1$$ZI$$Base|
                IMPORT  |Image$$ER_IROM1$$ZI$$Length|
                IMPORT  |Image$$ER_IROM1$$ZI$$Limit|
                
                ; RAM: Symbols defined by the linker
                IMPORT  |Load$$RW_IRAM1$$Base|             ; Load Address 
                IMPORT  |Image$$RW_IRAM1$$Base|            ; Start of RW output section
                IMPORT  |Image$$RW_IRAM1$$Length|
                IMPORT  |Image$$RW_IRAM1$$Limit|
                
                IMPORT  |Image$$RW_IRAM1$$RO$$Base|
                IMPORT  |Image$$RW_IRAM1$$RO$$Base|
                IMPORT  |Image$$RW_IRAM1$$RO$$Length|        
                
                IMPORT  |Image$$RW_IRAM1$$RW$$Base|       ; Start of RW output section
                IMPORT  |Image$$RW_IRAM1$$RW$$Limit|      ; End of RW output section
                IMPORT  |Image$$RW_IRAM1$$RW$$Length|     ; Size of RW output section
                
                IMPORT  |Image$$RW_IRAM1$$ZI$$Base|       ; Start of ZI output section
                IMPORT  |Image$$RW_IRAM1$$ZI$$Limit|      ; End of ZI output section
                IMPORT  |Image$$RW_IRAM1$$ZI$$Length|     ; Size of ZI output section
;******************** END ************************************************************************


Stack_Size      EQU     0x00000400

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp


; <h> Heap Configuration
;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Heap_Size       EQU     0x00000200

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit

                PRESERVE8
                THUMB


; Vector Table Mapped to Address 0 at Reset
                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors
                EXPORT  __Vectors_End
                EXPORT  __Vectors_Size

__Vectors       DCD     __initial_sp              ; Top of Stack
                DCD     Reset_Handler             ; Reset Handler
                DCD     NMI_Handler               ; NMI Handler
                DCD     HardFault_Handler         ; Hard Fault Handler
                DCD     MemManage_Handler         ; MPU Fault Handler
                DCD     BusFault_Handler          ; Bus Fault Handler
                DCD     UsageFault_Handler        ; Usage Fault Handler
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     SVC_Handler               ; SVCall Handler
                DCD     DebugMon_Handler          ; Debug Monitor Handler
                DCD     0                         ; Reserved
                DCD     PendSV_Handler            ; PendSV Handler
                DCD     SysTick_Handler           ; SysTick Handler

                ; External Interrupts
                DCD     WWDG_IRQHandler           ; Window Watchdog
                DCD     PVD_IRQHandler            ; PVD through EXTI Line detect
                DCD     TAMPER_STAMP_IRQHandler   ; Tamper and Time Stamp
                DCD     RTC_WKUP_IRQHandler       ; RTC Wakeup
                DCD     FLASH_IRQHandler          ; FLASH
                DCD     RCC_IRQHandler            ; RCC
                DCD     EXTI0_IRQHandler          ; EXTI Line 0
                DCD     EXTI1_IRQHandler          ; EXTI Line 1
                DCD     EXTI2_IRQHandler          ; EXTI Line 2
                DCD     EXTI3_IRQHandler          ; EXTI Line 3
                DCD     EXTI4_IRQHandler          ; EXTI Line 4
                DCD     DMA1_Channel1_IRQHandler  ; DMA1 Channel 1
                DCD     DMA1_Channel2_IRQHandler  ; DMA1 Channel 2
                DCD     DMA1_Channel3_IRQHandler  ; DMA1 Channel 3
                DCD     DMA1_Channel4_IRQHandler  ; DMA1 Channel 4
                DCD     DMA1_Channel5_IRQHandler  ; DMA1 Channel 5
                DCD     DMA1_Channel6_IRQHandler  ; DMA1 Channel 6
                DCD     DMA1_Channel7_IRQHandler  ; DMA1 Channel 7
                DCD     ADC1_IRQHandler           ; ADC1
                DCD     USB_HP_IRQHandler         ; USB High Priority
                DCD     USB_LP_IRQHandler         ; USB Low  Priority
                DCD     DAC_IRQHandler            ; DAC
                DCD     COMP_IRQHandler           ; COMP through EXTI Line
                DCD     EXTI9_5_IRQHandler        ; EXTI Line 9..5
                DCD     LCD_IRQHandler            ; LCD
                DCD     TIM9_IRQHandler           ; TIM9
                DCD     TIM10_IRQHandler          ; TIM10
                DCD     TIM11_IRQHandler          ; TIM11
                DCD     TIM2_IRQHandler           ; TIM2
                DCD     TIM3_IRQHandler           ; TIM3
                DCD     TIM4_IRQHandler           ; TIM4
                DCD     I2C1_EV_IRQHandler        ; I2C1 Event
                DCD     I2C1_ER_IRQHandler        ; I2C1 Error
                DCD     I2C2_EV_IRQHandler        ; I2C2 Event
                DCD     I2C2_ER_IRQHandler        ; I2C2 Error
                DCD     SPI1_IRQHandler           ; SPI1
                DCD     SPI2_IRQHandler           ; SPI2
                DCD     USART1_IRQHandler         ; USART1
                DCD     USART2_IRQHandler         ; USART2
                DCD     USART3_IRQHandler         ; USART3
                DCD     EXTI15_10_IRQHandler      ; EXTI Line 15..10
                DCD     RTC_Alarm_IRQHandler      ; RTC Alarm through EXTI Line
                DCD     USB_FS_WKUP_IRQHandler    ; USB FS Wakeup from suspend
                DCD     TIM6_IRQHandler           ; TIM6
                DCD     TIM7_IRQHandler           ; TIM7
__Vectors_End

__Vectors_Size  EQU  __Vectors_End - __Vectors

                AREA    |.text|, CODE, READONLY

; Reset handler routine
Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  __main

;******************** Removed by Dr. Zhu ***************************************************			
                ; IMPORT  SystemInit  
                ; LDR     R0, =SystemInit  ; Commented out by ZHU
                ; BLX     R0               ; Commented out by ZHU
 
;******************** Added by Dr. Zhu *****************************************************
                ; Copy the RW Data from Flash to RAM 
                LDR    r0, =|Image$$ER_IROM1$$RO$$Limit|
                LDR    r1, =|Image$$RW_IRAM1$$RW$$Base|
                LDR    r3, =|Image$$RW_IRAM1$$ZI$$Base|
Copy_RW         CMP    r1, r3
                LDRCC  r2, [r0], #4
                STRCC  r2, [r1], #4
                BCC    Copy_RW
        
                ; Copy the ZI Data from Flash to RAM
                LDR    r1, =|Image$$RW_IRAM1$$ZI$$Limit|
                MOV    r2, #0
Initialize_ZI   CMP    r3, r1
                STRCC  r2, [r3], #4
                BCC    Initialize_ZI
;******************** END ********************************************************************
                
                LDR    R0, =__main
                BX     R0
                ENDP

; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler     PROC
                EXPORT  NMI_Handler                [WEAK]
                B       .
                ENDP
HardFault_Handler\
                PROC
                EXPORT  HardFault_Handler          [WEAK]
                B       .
                ENDP
MemManage_Handler\
                PROC
                EXPORT  MemManage_Handler          [WEAK]
                B       .
                ENDP
BusFault_Handler\
                PROC
                EXPORT  BusFault_Handler           [WEAK]
                B       .
                ENDP
UsageFault_Handler\
                PROC
                EXPORT  UsageFault_Handler         [WEAK]
                B       .
                ENDP
SVC_Handler     PROC
                EXPORT  SVC_Handler                [WEAK]
                B       .
                ENDP
DebugMon_Handler\
                PROC
                EXPORT  DebugMon_Handler           [WEAK]
                B       .
                ENDP
PendSV_Handler  PROC
                EXPORT  PendSV_Handler             [WEAK]
                B       .
                ENDP
SysTick_Handler PROC
                EXPORT  SysTick_Handler            [WEAK]
                B       .
                ENDP

Default_Handler PROC

                EXPORT  WWDG_IRQHandler            [WEAK]
                EXPORT  PVD_IRQHandler             [WEAK]
                EXPORT  TAMPER_STAMP_IRQHandler    [WEAK]
                EXPORT  RTC_WKUP_IRQHandler        [WEAK]
                EXPORT  FLASH_IRQHandler           [WEAK]
                EXPORT  RCC_IRQHandler             [WEAK]
                EXPORT  EXTI0_IRQHandler           [WEAK]
                EXPORT  EXTI1_IRQHandler           [WEAK]
                EXPORT  EXTI2_IRQHandler           [WEAK]
                EXPORT  EXTI3_IRQHandler           [WEAK]
                EXPORT  EXTI4_IRQHandler           [WEAK]
                EXPORT  DMA1_Channel1_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel2_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel3_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel4_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel5_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel6_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel7_IRQHandler   [WEAK]
                EXPORT  ADC1_IRQHandler            [WEAK]
                EXPORT  USB_HP_IRQHandler          [WEAK]
                EXPORT  USB_LP_IRQHandler          [WEAK]
                EXPORT  DAC_IRQHandler             [WEAK]
                EXPORT  COMP_IRQHandler            [WEAK]
                EXPORT  EXTI9_5_IRQHandler         [WEAK]
                EXPORT  LCD_IRQHandler             [WEAK]
                EXPORT  TIM9_IRQHandler            [WEAK]
                EXPORT  TIM10_IRQHandler           [WEAK]
                EXPORT  TIM11_IRQHandler           [WEAK]
                EXPORT  TIM2_IRQHandler            [WEAK]
                EXPORT  TIM3_IRQHandler            [WEAK]
                EXPORT  TIM4_IRQHandler            [WEAK]
                EXPORT  I2C1_EV_IRQHandler         [WEAK]
                EXPORT  I2C1_ER_IRQHandler         [WEAK]
                EXPORT  I2C2_EV_IRQHandler         [WEAK]
                EXPORT  I2C2_ER_IRQHandler         [WEAK]
                EXPORT  SPI1_IRQHandler            [WEAK]
                EXPORT  SPI2_IRQHandler            [WEAK]
                EXPORT  USART1_IRQHandler          [WEAK]
                EXPORT  USART2_IRQHandler          [WEAK]
                EXPORT  USART3_IRQHandler          [WEAK]
                EXPORT  EXTI15_10_IRQHandler       [WEAK]
                EXPORT  RTC_Alarm_IRQHandler       [WEAK]
                EXPORT  USB_FS_WKUP_IRQHandler     [WEAK]
                EXPORT  TIM6_IRQHandler            [WEAK]
                EXPORT  TIM7_IRQHandler            [WEAK]

WWDG_IRQHandler
PVD_IRQHandler
TAMPER_STAMP_IRQHandler
RTC_WKUP_IRQHandler
FLASH_IRQHandler
RCC_IRQHandler
EXTI0_IRQHandler
EXTI1_IRQHandler
EXTI2_IRQHandler
EXTI3_IRQHandler
EXTI4_IRQHandler
DMA1_Channel1_IRQHandler
DMA1_Channel2_IRQHandler
DMA1_Channel3_IRQHandler
DMA1_Channel4_IRQHandler
DMA1_Channel5_IRQHandler
DMA1_Channel6_IRQHandler
DMA1_Channel7_IRQHandler
ADC1_IRQHandler
USB_HP_IRQHandler
USB_LP_IRQHandler
DAC_IRQHandler
COMP_IRQHandler
EXTI9_5_IRQHandler
LCD_IRQHandler
TIM9_IRQHandler
TIM10_IRQHandler
TIM11_IRQHandler
TIM2_IRQHandler
TIM3_IRQHandler
TIM4_IRQHandler
I2C1_EV_IRQHandler
I2C1_ER_IRQHandler
I2C2_EV_IRQHandler
I2C2_ER_IRQHandler
SPI1_IRQHandler
SPI2_IRQHandler
USART1_IRQHandler
USART2_IRQHandler
USART3_IRQHandler
EXTI15_10_IRQHandler
RTC_Alarm_IRQHandler
USB_FS_WKUP_IRQHandler
TIM6_IRQHandler
TIM7_IRQHandler

                B       .

                ENDP

                ALIGN

;*******************************************************************************
; User Stack and Heap initialization
;*******************************************************************************
                 IF      :DEF:__MICROLIB           
                
                 EXPORT  __initial_sp
                 EXPORT  __heap_base
                 EXPORT  __heap_limit
                
                 ELSE
                
;                IMPORT  __use_two_region_memory            ; Commented out by Zhu
                                                             ; __use_two_region_memory, two regions in the scatter file, 
                                                             ; one for the heap and one for the stack
                 EXPORT  __user_initial_stackheap
                 
__user_initial_stackheap

                 LDR     R0, =  Heap_Mem
                 LDR     R1, =(Stack_Mem + Stack_Size)
                 LDR     R2, = (Heap_Mem +  Heap_Size)
                 LDR     R3, = Stack_Mem
                 BX      LR

                 ALIGN

                 ENDIF

                 END

;******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE*****
