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STM32G071: I2C Bootloading Go Command Jump to Start of Program and Execute without hardware reset?

FaikN
Associate II

‎2022-01-19 03:10 AM

Hi,

I am using an external chip to do i2c bootloading for STM32G071 mcu. I am able to erase, write to memory (from flash address 0x08000000) and send Go command to the same flash memory address, for starting the program. The SM32G071 responds all with ACK command. However, it seems like the execution does not happen unless I do a hardware reset.

I think the problem there could be either with how I jump to booloader (or maybe initialization of I2C) or with vector tables at startup_stm32g071rbtx.s

Could you please help me to figure out how i need to map this file or jump to bootloader function in order to execute the newly uploaded .bin file execute automatically?

Attached you could find the code snippet for vector table and jump to bootloader.

 
.syntax unified
.cpu cortex-m0plus
.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
 
/**
 * @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:
  ldr   r0, =_estack
  mov   sp, r0          /* set stack pointer */
 
/* Call the clock system initialization function.*/
  bl  SystemInit
 
/* 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 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 detect */
  .word RTC_TAMP_IRQHandler               /* RTC through the EXTI line    */
  .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 UCPD1_2_IRQHandler                /* UCPD1, UCPD2                 */
  .word DMA1_Channel1_IRQHandler          /* DMA1 Channel 1               */
  .word DMA1_Channel2_3_IRQHandler        /* DMA1 Channel 2 and Channel 3 */
  .word DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler /* DMA1 Channel 4 to Channel 7, DMAMUX1 overrun */
  .word ADC1_COMP_IRQHandler              /* ADC1, COMP1 and COMP2         */
  .word TIM1_BRK_UP_TRG_COM_IRQHandler    /* TIM1 Break, Update, Trigger and Commutation */
  .word TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */
  .word TIM2_IRQHandler                   /* TIM2                         */
  .word TIM3_IRQHandler                   /* TIM3                         */
  .word TIM6_DAC_LPTIM1_IRQHandler        /* TIM6, DAC and LPTIM1         */
  .word TIM7_LPTIM2_IRQHandler            /* TIM7 and LPTIM2              */
  .word TIM14_IRQHandler                  /* TIM14                        */
  .word TIM15_IRQHandler                  /* TIM15                        */
  .word TIM16_IRQHandler                  /* TIM16                        */
  .word TIM17_IRQHandler                  /* TIM17                        */
  .word I2C1_IRQHandler                   /* I2C1                         */
  .word I2C2_IRQHandler                   /* I2C2                         */
  .word SPI1_IRQHandler                   /* SPI1                         */
  .word SPI2_IRQHandler                   /* SPI2                         */
  .word USART1_IRQHandler                 /* USART1                       */
  .word USART2_IRQHandler                 /* USART2                       */
  .word USART3_4_LPUART1_IRQHandler       /* USART3, USART4 and LPUART1   */
  .word CEC_IRQHandler                    /* CEC                          */
 
/*******************************************************************************
*
* 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_TAMP_IRQHandler
  .thumb_set RTC_TAMP_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      UCPD1_2_IRQHandler
  .thumb_set UCPD1_2_IRQHandler,Default_Handler
 
  .weak      DMA1_Channel1_IRQHandler
  .thumb_set DMA1_Channel1_IRQHandler,Default_Handler
 
  .weak      DMA1_Channel2_3_IRQHandler
  .thumb_set DMA1_Channel2_3_IRQHandler,Default_Handler
 
  .weak      DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler
  .thumb_set DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler,Default_Handler
 
  .weak      ADC1_COMP_IRQHandler
  .thumb_set ADC1_COMP_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      TIM2_IRQHandler
  .thumb_set TIM2_IRQHandler,Default_Handler
 
  .weak      TIM3_IRQHandler
  .thumb_set TIM3_IRQHandler,Default_Handler
 
  .weak      TIM6_DAC_LPTIM1_IRQHandler
  .thumb_set TIM6_DAC_LPTIM1_IRQHandler,Default_Handler
 
  .weak      TIM7_LPTIM2_IRQHandler
  .thumb_set TIM7_LPTIM2_IRQHandler,Default_Handler
 
  .weak      TIM14_IRQHandler
  .thumb_set TIM14_IRQHandler,Default_Handler
 
  .weak      TIM15_IRQHandler
  .thumb_set TIM15_IRQHandler,Default_Handler
 
  .weak      TIM16_IRQHandler
  .thumb_set TIM16_IRQHandler,Default_Handler
 
  .weak      TIM17_IRQHandler
  .thumb_set TIM17_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      SPI2_IRQHandler
  .thumb_set SPI2_IRQHandler,Default_Handler
 
  .weak      USART1_IRQHandler
  .thumb_set USART1_IRQHandler,Default_Handler
 
  .weak      USART2_IRQHandler
  .thumb_set USART2_IRQHandler,Default_Handler
 
  .weak      USART3_4_LPUART1_IRQHandler
  .thumb_set USART3_4_LPUART1_IRQHandler,Default_Handler
 
  .weak      CEC_IRQHandler
  .thumb_set CEC_IRQHandler,Default_Handler
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 

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