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工作环境:STM32CubeMX+Keil
相关环境准备这里就不介绍了。
在介绍升级流程之前。我们必须先搞清楚MCU型号对应的Flash分区情况,可以直接查看手册(当然,其实我们也可以在hal库代码中找到相关信息),如下图:
因为上文说到,我们有两个程序需要下载到Flash,bootloader文件一般下载在最开始的地址,application一般在后面的地址。
上图即为我们预定义的flash分配情况。我们一般是按照整个扇区进行利用的,这样便于擦除和写入。
bootloader从起始地址开始,这个没有疑问。我分配了扇区0给它(这个大小是具体情况而定)。
ota_flag这个是用于存放是否升级的标志位。存放在扇区1,ota_flag只占用4字节,当写入0x87654321的时候,表示需要升级,否则,无需升级。
application占用了两个连续的扇区,扇区2和扇区3。
ota_data也占用了两个连续的扇区,扇区4和扇区5。
#ifndef BOOTLOADER_H #define BOOTLOADER_H #ifdef __cpluscplus extern "c" { #endif #define FLASH_SECTOR_STEP_SIZE (128*1024) #define FLASH_SECTOR_0_ADDRESS (0x08000000) #define MCU_OTA_FLAG_ADDRESS (FLASH_SECTOR_0_ADDRESS+ FLASH_SECTOR_STEP_SIZE * FLASH_SECTOR_1) #define APPLICATION_ADDRESS (FLASH_SECTOR_0_ADDRESS+ FLASH_SECTOR_STEP_SIZE * FLASH_SECTOR_2) #define MCU_OTA_DATA_ADDRESS (FLASH_SECTOR_0_ADDRESS+ FLASH_SECTOR_STEP_SIZE * FLASH_SECTOR_4) #define MCU_OTA_FLAG_VALUE (0x87654321) int erase_mcu_ota_flag(); int write_mcu_ota_flag(); int erase_application_sectors(); int write_application_sectors(); int mcu_reset(); #ifdef __cpluscplus } #endif #endif
#include "bootloader.h" #include "stm32h7xx_hal.h" #include "stm32h7xx_hal_flash.h" #include <stdint.h> int erase_mcu_ota_flag() { int ret=0; uint32_t SectorError = 0; FLASH_EraseInitTypeDef sector; sector.TypeErase = FLASH_TYPEERASE_SECTORS; sector.VoltageRange = FLASH_VOLTAGE_RANGE_3; sector.Sector = FLASH_SECTOR_1; sector.NbSectors = 1; HAL_FLASH_Unlock(); ret = HAL_FLASHEx_Erase(§or, &SectorError); HAL_FLASH_Lock(); return ret; } int write_mcu_ota_flag() { int ret=0; HAL_FLASH_Unlock(); ret = HAL_FLASH_Program(FLASH_PSIZE_WORD, MCU_OTA_FLAG_ADDRESS, MCU_OTA_FLAG_VALUE); HAL_FLASH_Lock(); return ret; } int erase_application_sectors() { int ret=0; uint32_t SectorError = 0; FLASH_EraseInitTypeDef sector; sector.TypeErase = FLASH_TYPEERASE_SECTORS; sector.VoltageRange = FLASH_VOLTAGE_RANGE_3; sector.Sector = FLASH_SECTOR_2; sector.NbSectors = 2; HAL_FLASH_Unlock(); ret = HAL_FLASHEx_Erase(§or, &SectorError); HAL_FLASH_Lock(); return ret; } int write_application_sectors() { int ret=0; HAL_FLASH_Unlock(); for(int i=0;i<MCU_OTA_DATA_ADDRESS;i+=4) { ret = HAL_FLASH_Program(FLASH_PSIZE_WORD, APPLICATION_ADDRESS+i, *(__IO uint32_t*)(MCU_OTA_DATA_ADDRESS+i)); } HAL_FLASH_Lock(); return ret; } int mcu_reset() { __set_FAULTMASK(1); __NVIC_SystemReset(); }
/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2023 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "usart.h" #include "gpio.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "bootloader.h" #include <stdio.h> /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ typedef void (*pFunction)(); /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); /* USER CODE BEGIN PFP */ /* 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_USART1_UART_Init(); /* USER CODE BEGIN 2 */ uint32_t JumpAddress; pFunction Jump_To_Application; if(*(__IO uint32_t*)MCU_OTA_FLAG_ADDRESS != MCU_OTA_FLAG_VALUE) { JumpAddress = *(__IO uint32_t*)(APPLICATION_ADDRESS+4); Jump_To_Application = (pFunction)JumpAddress; __set_MSP(*(__IO uint32_t*)APPLICATION_ADDRESS); Jump_To_Application(); } else { printf("mcu_ota"); erase_application_sectors(); write_application_sectors(); erase_mcu_ota_flag(); mcu_reset(); } /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Supply configuration update enable */ HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY); /** Configure the main internal regulator output voltage */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2); while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {} /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 1; RCC_OscInitStruct.PLL.PLLN = 75; RCC_OscInitStruct.PLL.PLLP = 2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3; RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE; RCC_OscInitStruct.PLL.PLLFRACN = 0; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2 |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2; RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2; RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); while (1) { } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */
关于地址跳转部分,可以参考STM32 Bootloader程序中Jump2App函数分析
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