STM32F303xC bootloader

Posted on May 16, 2014 at 16:12

Hi everyone, i'm trying to enter bootloader from my application, so i could use STM flash loader tool to upgrade software. Everything is working fine and im entering bootloader, but after i flash with flash loader tool, nothing is working, even though i get successful program verifying messages. I tried to reset processor., connecting NRST to ground after flashing with the loader, but that doesn't help. So i suppose i did something wrong with configuration, before entering bootloader and stopping all processes. Or maybe it's not a good idea to init my bootloader function in USART IRQ handler? Any advices and help which would allow me to solve this will be highly appreciated. Thanks in advance. :)

Code:

#include ''stm32f30x.h''

#include ''main.h''

USART_InitTypeDef USART_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

void (*SystemMemoryBootJump) (void);

void BootLoaderInit(uint32_t BootLoaderStatus);

void USART1_Config(void)

{

  USART_InitStructure.USART_BaudRate = 9600; // Baud rate. Bits (or characters) per second.

  USART_InitStructure.USART_WordLength = USART_WordLength_8b; // Word lenght = 8 bits

  USART_InitStructure.USART_StopBits = USART_StopBits_1; // Use one stop bit

  USART_InitStructure.USART_Parity = USART_Parity_No ; // No parity

  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; // Receive and transmit enabletd

  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // Hardware flow control disabled (RTS and CTS signals)

  

  USART_Init(USART1, &USART_InitStructure);

  

  USART_Cmd(USART1, ENABLE); // Enable USART1 parameters

  

  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // Enable Rx interrupt

 

  NVIC_EnableIRQ(USART1_IRQn); // Enable USART1 global interrupt

}

void USART1_Rx_Tx_Config(void)

{

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; // use 9 and 10 pins for rx and tx

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);

}

void USART1_IRQHandler(void)

{

  if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) // Check if interrupt has occured or not

    {

        if((char)USART_ReceiveData(USART1) == 't') // If recieved t on rx pin , transmit T from tx pin

        {

          GPIOE->ODR ^= GPIO_Pin_8; // Toggle led state

          USART_SendData(USART1, 'T'); // Transmit T

        }

        

        if((char)USART_ReceiveData(USART1) == 0x7A)

        {

          //USART_SendData(USART1, 0xEE);

          BootLoaderInit(1);

        }

        

        if((char)USART_ReceiveData(USART1) == 'o') // If recieved t on rx pin , transmit T from tx pin

        {

          GPIOE->ODR ^= GPIO_Pin_9; // Toggle led state

          USART_SendData(USART1, 0x3C); // Transmit T

        }

    }

}

int main(void)

{

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); // Enable clock for port A

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE); // Enable clock for port E

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // USART1 clock enable

  

  USART1_Config();

  USART1_Rx_Tx_Config();

  

  // Port E pin 8 blue led configuration

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; // use 8 pin to blink led

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; 

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOE, &GPIO_InitStructure);

  

  // NVIC structure for USART1 interrupt

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

 // USART1_IRQHandler();

   while(1)

   {

  

     // Do nothing, all happens in ISR (Interrupt service routine)  

   }

}

void BootLoaderInit(uint32_t BootLoaderStatus)

{

    SystemMemoryBootJump=(void (*)(void)) (*((u32 *) 0x1FFFD804));// Point PC to System Memory reset vector (+4 the offset)

    

  if(BootLoaderStatus == 1)

  {

    RCC_DeInit(); // Shut down all running tasks. Set all clock configuration to the reset state

    SysTick->CTRL = 0; // Reset the system timer

    SysTick->LOAD = 0; // Reset system reload value register

    SysTick->VAL = 0; // Reset system Current value register.

    

  //  __set_PRIMASK(1); // Disable all interrupts

    __set_MSP(0x20001258); // Set the main stack pointer value

    

    SystemMemoryBootJump(); // Jump to the boot mode

    

 //   while(1);

  }   

}