/**
  ****************************************************************************
  Copyright (c) 2019, Nations Technologies Inc.

  All rights reserved.
  ****************************************************************************

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice,
  this list of conditions and the disclaimer below.

  Nations' name may not be used to endorse or promote products derived from
  this software without specific prior written permission.

  DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
  DISCLAIMED. IN NO EVENT SHALL NATIONS 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.
  ****************************************************************************
 **/

  .syntax unified
  .cpu cortex-m0
  .fpu softvfp
  .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

  .section .text.Reset_Handler
  .weak Reset_Handler
  .type Reset_Handler, %function
Reset_Handler:
  ldr   r0, =_estack
  mov   sp, r0          /* set stack pointer */

/* Copy the data segment initializers from flash to SRAM */
  ldr r0, =_sdata
  ldr r1, =_edata
  ldr r2, =_sidata
  movs r3, #0
  b LoopCopyDataInit

CopyDataInit:
  ldr r4, [r2, r3]
  str r4, [r0, r3]
  adds r3, r3, #4

LoopCopyDataInit:
  adds r4, r0, r3
  cmp r4, r1
  bcc CopyDataInit
  
/* Zero fill the bss segment. */
  ldr r2, =_sbss
  ldr r4, =_ebss
  movs r3, #0
  b LoopFillZerobss

FillZerobss:
  str  r3, [r2]
  adds r2, r2, #4

LoopFillZerobss:
  cmp r2, r4
  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 M0.  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  0
  .word  0
  .word  0
  .word  0
  .word  0
  .word  0
  .word  0
  .word  SVC_Handler
  .word  0
  .word  0
  .word  PendSV_Handler
  .word  SysTick_Handler
  .word  WWDG_IRQHandler                   /* Window WatchDog                                       */
  .word  PVD_IRQHandler                    /* PVD through EXTI Line 16 detect                       */
  .word  RTC_IRQHandler                    /* RTC interrupt(through EXTI line 17/19/20 interrupt)   */
  .word  MMU_IRQHandler                    /* MMU                                                   */
  .word  FLASH_IRQHandler                  /* FLASH                                                 */
  .word  RCC_IRQHandler                    /* RCC                                                   */
  .word  EXTI0_1_IRQHandler                /* EXTI Line 0 and 1                                     */
  .word  EXTI2_3_IRQHandler                /* EXTI Line 2 and 3                                     */
  .word  EXTI4_15_IRQHandler               /* EXTI Line 4 to 15                                     */
  .word  RESERVE9_IRQHandler               /* RESERVE9                                              */
  .word  DMA_Channel1_2_IRQHandler         /* DMA Channel 1,2                                       */
  .word  DMA_Channel1_2_3_4_IRQHandler     /* DMA Channel 1,2,3,4                                   */
  .word  DMA_Channel5_IRQHandler           /* DMA Channel 5                                         */
  .word  TIM1_BRK_UP_TRG_COM_IRQHandler    /* TIM1 Break, Update, Trigger and Commutation           */
  .word  TIM1_CC_IRQHandler                /* TIM1 Capture Compare                                  */
  .word  DMA_Channel3_4_IRQHandler         /* DMA Channel 3,4                                       */
  .word  TIM3_IRQHandler                   /* TIM3                                                  */
  .word  USART2_IRQHandler                 /* USART2                                                */
  .word  TIM8_BRK_UP_TRG_COM_IRQHandler    /* TIM8 Break/Update/Trigger and Commutation             */
  .word  TIM8_CC_IRQHandler                /* TIM8 Capture Compare                                  */
  .word  LPTIM_TIM6_IRQHandler             /* LPTIM/TIM6                                            */
  .word  ADC_IRQHandler                    /* ADC                                                   */
  .word  SPI2_IRQHandler                   /* SPI2                                                  */
  .word  I2C1_IRQHandler                   /* I2C1                                                  */
  .word  I2C2_IRQHandler                   /* I2C2                                                  */
  .word  SPI1_IRQHandler                   /* SPI1                                                  */
  .word  HDIV_SQRT_IRQHandler              /* HDIV/SQRT                                             */
  .word  RAMC_PERR_IRQHandler              /* RAMC PARITY ERR                                       */
  .word  USART1_2_IRQHandler               /* USART1/USART2                                         */
  .word  LPUART_IRQHandler                 /* LPUART                                                */
  .word  USART1_IRQHandler                 /* USART1                                                */
  .word  COMP_IRQHandler                   /* COMP                                                  */

/*******************************************************************************
*
* 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      SVC_Handler
  .thumb_set SVC_Handler,Default_Handler

  .weak      PendSV_Handler
  .thumb_set PendSV_Handler,Default_Handler

  .weak      SysTick_Handler
  .thumb_set SysTick_Handler,Default_Handler

  .weak      WWDG_IRQHandler
  .thumb_set WWDG_IRQHandler,Default_Handler

  .weak      PVD_IRQHandler
  .thumb_set PVD_IRQHandler,Default_Handler
  
  .weak      RTC_IRQHandler
  .thumb_set RTC_IRQHandler,Default_Handler

  .weak      MMU_IRQHandler
  .thumb_set MMU_IRQHandler,Default_Handler
  
  .weak      FLASH_IRQHandler
  .thumb_set FLASH_IRQHandler,Default_Handler

  .weak      RCC_IRQHandler
  .thumb_set RCC_IRQHandler,Default_Handler

  .weak      EXTI0_1_IRQHandler
  .thumb_set EXTI0_1_IRQHandler,Default_Handler

  .weak      EXTI2_3_IRQHandler
  .thumb_set EXTI2_3_IRQHandler,Default_Handler

  .weak      EXTI4_15_IRQHandler
  .thumb_set EXTI4_15_IRQHandler,Default_Handler

  .weak      RESERVE9_IRQHandler
  .thumb_set RESERVE9_IRQHandler,Default_Handler

  .weak      DMA_Channel1_2_IRQHandler
  .thumb_set DMA_Channel1_2_IRQHandler,Default_Handler
  
  .weak      DMA_Channel1_2_3_4_IRQHandler
  .thumb_set DMA_Channel1_2_3_4_IRQHandler,Default_Handler

  .weak      DMA_Channel5_IRQHandler
  .thumb_set DMA_Channel5_IRQHandler,Default_Handler
  
  .weak      TIM1_BRK_UP_TRG_COM_IRQHandler
  .thumb_set TIM1_BRK_UP_TRG_COM_IRQHandler,Default_Handler

  .weak      TIM1_CC_IRQHandler
  .thumb_set TIM1_CC_IRQHandler,Default_Handler

  .weak      DMA_Channel3_4_IRQHandler
  .thumb_set DMA_Channel3_4_IRQHandler,Default_Handler
  
  .weak      TIM3_IRQHandler
  .thumb_set TIM3_IRQHandler,Default_Handler

  .weak      USART2_IRQHandler
  .thumb_set USART2_IRQHandler,Default_Handler

  .weak      TIM8_BRK_UP_TRG_COM_IRQHandler
  .thumb_set TIM8_BRK_UP_TRG_COM_IRQHandler,Default_Handler

  .weak      TIM8_CC_IRQHandler
  .thumb_set TIM8_CC_IRQHandler,Default_Handler

  .weak      LPTIM_TIM6_IRQHandler
  .thumb_set LPTIM_TIM6_IRQHandler,Default_Handler

  .weak      ADC_IRQHandler
  .thumb_set ADC_IRQHandler,Default_Handler

  .weak      SPI2_IRQHandler
  .thumb_set SPI2_IRQHandler,Default_Handler
  
  .weak      I2C1_IRQHandler
  .thumb_set I2C1_IRQHandler,Default_Handler

  .weak      I2C2_IRQHandler
  .thumb_set I2C2_IRQHandler,Default_Handler

  .weak      SPI1_IRQHandler
  .thumb_set SPI1_IRQHandler,Default_Handler

  .weak      HDIV_SQRT_IRQHandler
  .thumb_set HDIV_SQRT_IRQHandler,Default_Handler
  
  .weak      RAMC_PERR_IRQHandler
  .thumb_set RAMC_PERR_IRQHandler,Default_Handler
  
  .weak      USART1_2_IRQHandler
  .thumb_set USART1_2_IRQHandler,Default_Handler
  
  .weak      LPUART_IRQHandler
  .thumb_set LPUART_IRQHandler,Default_Handler

  .weak      USART1_IRQHandler
  .thumb_set USART1_IRQHandler,Default_Handler

  .weak      COMP_IRQHandler
  .thumb_set COMP_IRQHandler,Default_Handler

