STM32F303xC bootloader

[ArturasV]

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);  }   }

[Tesla DeLorean]

Posted on May 16, 2014 at 16:51

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. 🙂

Or, that the code you uploaded is simply non-functional. Use a debugger, or have some code early in the Reset_Handler to output progress/waypoint indications via GPIO, LED or USART

[ArturasV]

Posted on May 16, 2014 at 17:08

Or, that the code you uploaded is simply non-functional.

How can it be, if i download the code for the first time via ST-link and USART interrupt is working, blue or red led turns on when a character is received via USART. Even the entering bootloader command works because then i can use flash loader.

have some code early in the Reset_Handler to output progress/waypoint indications via GPIO, LED or USART

And could you be more specific, what i should look at? It's a first time i'm trying to do something like this.Thanks in advance.

[Tesla DeLorean]

Posted on May 16, 2014 at 18:02

How can it be, if i download the code for the first time via ST-link and USART interrupt is working, blue or red led turns on when a character is received via USART. Even the entering bootloader command works because then i can use flash loader.

Ok, I'm trying to follow the narrative here, but after you enter the System Loader code, and you then erase and download something else, it's this new thing that isn't running, or you're breaking your original loader? The System Loader is not going to come back to your original call, the reset is the way it will restart. Can you use the ST-Link (Utilities) to read out what you've managed to write in with the Flash Loader Demonstrator? How does this new content materially differ from the loader that you put in initially?

[ArturasV]

Posted on May 19, 2014 at 13:47

Your advice helped me to check the contents of the program. And what i found out that look at my code which i posted above. For some reason the line __set_PRIMASK(1) is commented, and it shouldn't be. After that, i found out that is not possible to get program to work this way. When i just set up any random pin to the high level when i get command on usart, and then check the pin state in a while loop if(input_databit ==1){BootloaderInit(1)} everything works fine and i was able to use the flash loader without any problems. So i guess is that because i have to shut down all interrups, i shut them down before doing all tasks which are required to enter bootloader. I believe that is why it wasn't working.