startup_stm32.c

/**
 * @file startup_stm32f1.c
 * @author Rohit Nimkar (nehalnimkar@gmail.com)
 * @brief startup declarations and function for the STM32F1 series controllers
 *        See: RM0008 10.1.2 Interrupt and exception vectors, Table 63. Vector table for other STM32F10xxx devices
 * 
 * @version 1.2
 * @date 2022-12-07
 * 
 * @copyright Copyright (c) 2022
 * @attention
 * 
 * This software component is licensed by Rohit Nimkar under BSD 3-Clause license,
 * the "License"; You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at: opensource.org/licenses/BSD-3-Clause
 *
 */

#include <stdint.h>
#include <stm32f1xx.h>
#include <main.h>
#include <startup_stm32f1.h>

// Define the vector table
uint32_t vectors[] __attribute__((section(".isr_vector"))) = {
    (uint32_t)&_stack_top,
    (uint32_t)Reset_Handler,
    (uint32_t)NMI_Handler,
    (uint32_t)HardFault_Handler,
    (uint32_t)MemManage_Handler,
    (uint32_t)BusFault_Handler,
    (uint32_t)UsageFault_Handler,
    0,        // reserved
    0,        // reserved
    0,        // reserved
    0,        // reserved
    (uint32_t)SVC_Handler,
    (uint32_t)DebugMon_Handler,
    0,        // reserved
    (uint32_t)PendSV_Handler,
    (uint32_t)SysTick_Handler,
    (uint32_t)WWDG_IRQHandler,
    (uint32_t)PVD_IRQHandler,
    (uint32_t)TAMP_STAMP_IRQHandler,
    (uint32_t)RTC_WKUP_IRQHandler,
    0,        // Flash global interrupt
    (uint32_t)RCC_IRQHandler,
    (uint32_t)EXTI0_IRQHandler,
    (uint32_t)EXTI1_IRQHandler,
    (uint32_t)EXTI2_IRQHandler,
    (uint32_t)EXTI3_IRQHandler,
    (uint32_t)EXTI4_IRQHandler,
    (uint32_t)DMA1_Channel1_IRQHandler,
    (uint32_t)DMA1_Channel2_IRQHandler,
    (uint32_t)DMA1_Channel3_IRQHandler,
    (uint32_t)DMA1_Channel4_IRQHandler,
    (uint32_t)DMA1_Channel5_IRQHandler,
    (uint32_t)DMA1_Channel6_IRQHandler,
    (uint32_t)DMA1_Channel7_IRQHandler,
    (uint32_t)ADC_IRQHandler,
    (uint32_t)USB_HP_CAN_TX_IRQHandler,
    (uint32_t)USB_LP_CAN_RX0_IRQHandler,
    (uint32_t)CAN_RX1_IRQHandler,
    (uint32_t)CAN_SCE_IRQHandler,
    (uint32_t)EXTI9_5_IRQHandler,
    (uint32_t)TIM1_BRK_IRQHandler,
    (uint32_t)TIM1_UP_IRQHandler,
    (uint32_t)TIM1_TRG_COM_IRQHandler,
    (uint32_t)TIM1_CC_IRQHandler,
    (uint32_t)TIM2_IRQHandler,
    (uint32_t)TIM3_IRQHandler,
    (uint32_t)TIM4_IRQHandler,
    (uint32_t)I2C1_EV_IRQHandler,
    (uint32_t)I2C1_ER_IRQHandler,
    (uint32_t)I2C2_EV_IRQHandler,
    (uint32_t)I2C2_ER_IRQHandler,
    (uint32_t)SPI1_IRQHandler,
    (uint32_t)SPI2_IRQHandler,
    (uint32_t)USART1_IRQHandler,
    (uint32_t)USART2_IRQHandler,
    (uint32_t)USART3_IRQHandler,
    (uint32_t)EXTI15_10_IRQHandler,
    (uint32_t)RTC_Alarm_IRQHandler,
    (uint32_t)USB_Wakeup_IRQHandler,
};


void Default_Handler(void)
{
  while (1)
    ;
}


void __attribute__((noreturn)) Reset_Handler(void)
{
  // copy .data section to SRAM
  uint32_t *start_sram = (uint32_t *)&_sdata;
  uint32_t *start_flash = (uint32_t *)&_la_data;
  while (start_sram < (uint32_t *)&_edata)
  {
    *start_sram++ = *start_flash++;
  }

  // copy .bss section to SRAM
  uint32_t *start_bss = (uint32_t *)&_sbss;
  while (start_bss < (uint32_t *)&_ebss)
  {
    *start_bss++ = 0;
  }
  __libc_init_array();
  // Call main function
  main();

  // loop continuously
  while (1)
  {
    __asm("nop");
  }
  
}