STM32遠程升級基本思路
- 開發環境:IAR for ARM 8.30.1
- MCU:STM32F103RCT6
- 存儲介質:w25q32
1.實現思路
1.需要一個bootloader程序和APP程序
2.APP程序通過網絡或者串口等方式將要升級的代碼寫到spiFlash中約定的位置,然後重啓
3.bootloader判斷spiFlash中是否有文件需要更新,有就將文件更新到stm32的內部Flash的App區域,然後跳 轉到APP,否則直接跳轉
2.知識儲備
STM32閃存模塊組織
stm32F103RCT6屬於大容量型產品,ROM:256K,RAM:48K,頁大小爲2k,閃存分爲三個塊:
- 主存儲器:頁大小爲2K,256K也就是128頁
- 信息塊:分爲兩個部分:
- 系統存儲器(存放啓動程序代碼,ST出廠固化,不可更改,用於ISP編程)
- 用戶選項字節(Option Bytes,可以用它設置讀寫保護,硬件看門狗使能啥的)
- 閃存存儲器接口寄存器:操作stm32內部Flash要用到這些寄存器;
啓動配置
● 從主閃存存儲器啓動:主閃存存儲器被映射到啓動空間(0x0000 0000)
● 從系統存儲器啓動:系統存儲器被映射到啓動空間(0x0000 0000)
● 從內置SRAM啓動:只能在0x2000 0000開始的地址區訪問SRAM
3.Bootloader和App的工程設置
Bootloader和App公用RAM,佔用不同ROM空間,16K給Bootloader,240K給App
- Bootloader:
- Vector Table Start:0x0800 0000
- ROM:0x0800 0000 ~ 0x0800 4000
- RAM:0x0800 0000 ~ 0x0800 BFFF
- CSTACK: 0x400
- Heap: 0x0
- App:
- Vector Table Start:0x0800 4000
- ROM:0x0800 4000 ~ 0x0803 FFFF
- RAM:0x0800 0000 ~ 0x0800 BFFF
- CSTACK: 0x400
- Heap: 0x0
App程序中還要注意到的地方:修改中斷向量偏移VECT_TAB_OFFSET,偏移量就是bootloader程序大小
4.Bootloader程序編寫
話不多說,下面就是代碼:
- 頭文件
#define FLASH_MAX_ADDR (0x0803FFFFU) //MCU的Flash最大地址
#ifndef FLASH_PAGE_SIZE
#define FLASH_PAGE_SIZE (0x800U) //MCU的Flash的頁大小,大容量的爲2K,其他是1K
#endif
#define APP_BASEADDR (0x08004000U) //升級程序地址
#define APP_PAGE_NUM ((FLASH_MAX_ADDR-APP_BASEADDR)/FLASH_PAGE_SIZE+1)
#define SPIFLASHBUF_MAX_LEN (0x1000U) //spi flash最大緩衝4096字節
- C文件
void JumpToApplication(void)
{
typedef void (*pFunction)(void);
pFunction Jump_To_Application;
u32 JumpAddress;
/* Test if user code is programmed starting from address "ApplicationAddress" */
if (((*(__IO uint32_t*)APP_BASEADDR) & 0x2FFE0000 ) == 0x20000000)
{
DBG_LOG("----[Boot]Jump to Application!!!\r\n");
LED_ALL_OFF();
__disable_irq();
/* Jump to user application */
JumpAddress = *(__IO uint32_t*) (APP_BASEADDR + 4);
Jump_To_Application = (pFunction) JumpAddress;
/* Initialize user application's Stack Pointer */
__set_MSP(*(__IO uint32_t*) APP_BASEADDR);
Jump_To_Application();
}
else
{
DBG_LOG("----[Boot]Application Address is ERROR!!!\r\n");
LED_ALL_ON();
}
}
union {
u32 stm32[SPIFLASHBUF_MAX_LEN/4];
u8 spi[SPIFLASHBUF_MAX_LEN];
}Flash;
void Boot_Initializes(void)
{
u16 i,j;
u32 update_file_mark;
u32 writeFlashData;
HAL_StatusTypeDef status;
FLASH_EraseInitTypeDef f;
f.TypeErase = FLASH_TYPEERASE_PAGES;
f.PageAddress = APP_BASEADDR;
f.NbPages = APP_PAGE_NUM;
//1.判斷spi flash DFU區是否有文件需要升級
SFlash_Read(SECTOR_ADDR(SECTOR_DFU_START),(u8 *)&update_file_mark,4);
if(update_file_mark == 0xFFFFFFFF){
DBG_LOG("[Boot] No Firmware Need to Update.");
LED_ON(ERR);
JumpToApplication();
return;
}
//有文件需要升級
DBG_LOG("[Boot] New Firmware Exist! Update Beginning...");
//2.Flash解鎖
status = HAL_FLASH_Unlock();
if(status != HAL_OK){
DBG_LOG("[Boot] FLASH Unlock Failed.");
LED_ON(ERR);
return;
}
DBG_LOG("[Boot] FLASH Unlock Ok.");
DBG_LOG("[Boot] Ready to Erase Flash ...");
//3.擦除Flash
status = HAL_FLASHEx_Erase(&f,&writeFlashData);
if(status != HAL_OK){
DBG_LOG("[Boot] Flash Erase Failed.");
LED_ON(ERR);
return;
}
DBG_LOG("[Boot] Flash Erase OK.");
//4.從SPIFlash中讀出數據然後copy到內部Flash中
for(i = 0;i < (APP_PAGE_NUM / 2);i++){
SFlash_Read(SECTOR_ADDR(SECTOR_DFU_START) + SPIFLASHBUF_MAX_LEN*i, Flash.spi, SPIFLASHBUF_MAX_LEN);
DBG_LOG("[Boot] Write Flash Progress:%d%%",(i*100/(APP_PAGE_NUM / 2)) );
LED_TOGGLE(WIFI);
for(j = 0;j < (SPIFLASHBUF_MAX_LEN/4);j++){
//注意基地址是在變化的
HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, APP_BASEADDR+SPIFLASHBUF_MAX_LEN*i+4*j, Flash.stm32[j]);
}
}
DBG_LOG("[Boot] Write Flash Progress:100%%");
DBG_LOG("[Boot] Program Complete!!!");
//5.Flash上鎖
HAL_FLASH_Lock();
//6.跳轉到用戶程序區
JumpToApplication();
}