Nucleo-F446 Bootloader with simple application-Blink LED

[FShah.1]

Hi, I am trying to make a simple bootloader for Nucleo-F446RE board.

My bootloader code is look like working, but I don't know why when it jumps to the application it doesn't work. I am forwarding printf to UART2 so I can see the BL code is working, once it tries to run the app it doesn't show any msg on screen. See the attached code.

/**   Bootloader Code                  **/

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
#define MAJOR 0 //Major version number
#define MINOR 1 ////Minor version number
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */
const uint8_t BL_Version[2] = {MAJOR,MINOR};
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
static void goto_application(void);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* MCU Configuration--------------------------------------------------------*/

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */
SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
printf("Starting Bootloader (%d.%d)\n",BL_Version[0],BL_Version[1]);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET); //Set Green LED
HAL_Delay(2000);
goto_application();

/* USER CODE END 2 */

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}

static void goto_application(void)

{

printf("Gonna jump to Application \n");

void (*app_reset_handler)(void) = (void*)(*((volatile uint32_t*) (0x08020000 + 4U)));

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);

app_reset_handler();

}

/**

* @brief Print the characters to UART (printf).

* @retval int

*/

#ifdef __GNUC__

/* With GCC, small printf (option LD Linker->Libraries->Small printf

set to 'Yes') calls __io_putchar() */

int __io_putchar(int ch)

#else

int fputc(int ch, FILE *f)

#endif /* __GNUC__ */

{

/* Place your implementation of fputc here */

/* e.g. write a character to the UART3 and Loop until the end of transmission */

HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, HAL_MAX_DELAY);

return ch;

}

/* USER CODE END 4 */

Bootloader xxx_Flash.Id File

/* Memories definition */

MEMORY

{

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K

FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 16K /*Bootloader block size is only 16KB*/

}

/****** Application Code **********/

int main(void)

{

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* MCU Configuration--------------------------------------------------------*/

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */

HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */

SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_USART2_UART_Init();

/* USER CODE BEGIN 2 */

printf("Starting Application (%d.%d)\n",APP_Version[0],APP_Version[1]);

/* USER CODE END 2 */

/* Infinite loop */

/* USER CODE BEGIN WHILE */

while (1)

{

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);

HAL_Delay(1000);

}

/* USER CODE END 3 */

}

Application Code xxx_Flash.Id File

/* Memories definition */

MEMORY

{

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K

FLASH (rx) : ORIGIN = 0x8020000, LENGTH = 128K /*Application stack size is 128KB (sector 5)*/

}

system_stm32f4xx.c File

#define USER_VECT_TAB_ADDRESS /*Uncomment this to start the application from a different vector table*/

#if defined(USER_VECT_TAB_ADDRESS)

/*!< Uncomment the following line if you need to relocate your vector Table

in Sram else user remap will be done in Flash. */

/* #define VECT_TAB_SRAM */

#if defined(VECT_TAB_SRAM)

#define VECT_TAB_BASE_ADDRESS SRAM_BASE /*!< Vector Table base address field.

This value must be a multiple of 0x200. */

#define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field.

This value must be a multiple of 0x200. */

#else

#define VECT_TAB_BASE_ADDRESS FLASH_BASE /*!< Vector Table base address field.

This value must be a multiple of 0x200. */

#define VECT_TAB_OFFSET 0x0020000U /*Change this from 00000000 to 00020000*/ /*!< Vector Table base offset field.

This value must be a multiple of 0x200. */

#endif /* VECT_TAB_SRAM */

#endif /* USER_VECT_TAB_ADDRESS */

[Pavel A.]

Hi,

Sorry not going to read your code (too long, not formatted nicely). Just consider that simple bootloaders like this are very common. Everyone makes some variant of such "bootloader". Besides of this forum, lots of examples, github projects and tutorials are available. Please take your time and search a little.