nRF52832 bootloader DFU固件升级源码详解（结合RTT日志打印）

曾经终败给现在 2023-10-08 19:41 42阅读 0赞

#### 文章目录 ####

*  一、前文
 *  二、init
 *  三、nrf\_dfu\_command\_req
 *  四、dfu\_handle\_prevalidate
 *  五、nrf\_dfu\_find\_cache
 *  六、nrf\_dfu\_data\_req
 *  七、nrf\_dfu\_postvalidate
 *  八、on\_dfu\_complete
 *  九、nrf\_dfu\_continue\_bank
 *  十、nrf\_dfu\_app\_continue
 *  十一、nrf\_dfu\_app\_is\_valid
 *  十二、nrf\_bootloader\_app\_start

## 一、前文 ##

> 在bootloader代码中添加大量日志，通过RTT打印日志。  
> 通过日志大致了解bootloader中DFU固件升级的代码逻辑。

大致流程：

*  `nrf_dfu_command_req`：命令触发，进入DFU升级模式
 *  `dfu_handle_prevalidate`：校验Image固件的哈希值
 *  `nrf_dfu_find_cache`：根据s\_dfu\_settings参数，判断新固件的flash存储地址
 *  `nrf_dfu_data_req`：新固件数据写入到flash存储地址
 *  `nrf_dfu_postvalidate`：校验新固件哈希值，并更新s\_dfu\_settings参数
 *  `on_dfu_complete`，dfu传输完成，重启设备
 *  `nrf_dfu_continue_bank`：重启后，继续上次固件分区的操作
 *  `nrf_dfu_app_continue`：新固件从bank1复制到bank0，bank1擦除
 *  `nrf_dfu_app_is_valid`：判断bank0的固件是否有效
 *  `nrf_bootloader_app_start`：从bootloader跳转app

## 二、init ##

00> :INFO:Inside main
    00> :INFO:In nrf_bootloader_init
    00> :INFO:nrf_dfu_init
    00> :INFO:-------------- nrf_dfu_settings_init --------------
    00> :INFO:  crc=0x50e2fe84
    00> :INFO:  write_offset=0x0
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=0
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=0
    00> :INFO:  bank_1.image_size=0x0
    00> :INFO:  bank_1.image_crc=0x0
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x0
    00> :INFO:  progress.cmd_offset=0x0
    00> :INFO:  progress.cmd_crc=0x0
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:-------------- nrf_dfu_continue_bank -------------- 
    00> :INFO:  src_addr=0x1f000
    00> :INFO:  bank_code=1
    00> :INFO:  image_size=0xeb14
    00> :INFO:  image_crc=0xa7f5f361
    00> :INFO:  Valid App
    00> :INFO:nrf_dfu_app_is_valid. CRC fail: 0xe00bbbd!=0xa7f5f361
    00> :INFO:nrf_dfu_transports_init start
    00> :INFO:nrf_dfu_transports_init num_transports: 1
    00> :INFO:ble_stack_init, vector table: 0x00073000
    00> SDH:WARNING:sd_ble_enable: RAM start should be adjusted to 0x20002798
    00> SDH:WARNING:RAM size should be adjusted to 0xd868 
    00> :INFO:nrf_dfu_transports_init end
    00> :INFO:------- nrf_dfu_flash_init-------
    00> :INFO:Waiting for events

## 三、nrf\_dfu\_command\_req ##

*  `nrf_dfu_command_req`：命令触发，进入DFU升级模式

00> :INFO:nrf_dfu_command_req, Valid Command: NRF_DFU_OBJECT_OP_SELECT
    00> :INFO:nrf_dfu_command_req, Before OP create command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP write command
    00> :INFO:nrf_dfu_command_req, Before OP execute command
    00> :INFO:nrf_dfu_command_req, Valid command execute
    00> :INFO:
    00> 12 8A 01 0A 44 08 01 12 40 08 02 10 34 1A 02 8C  .Š..D...@...4..Œ
    00> 01 20 00 28 00 30 00 38 94 D6 03 42 24 08 03 12  . .(.0.8”Ö.B$...
    00> 20 0B CD 46 83 80 90 50 6A BC 88 92 02 E4 D8 E2   .ÍFƒ.Pj¼ˆ’.äØâ
    00> 79 12 17 ED 09 76 C6 33 3D B1 8C BB 04 7B 5E 45  y..í.vÆ3=±Œ».{^E
    00> EE 48 00 52 04 08 01 12 00 10 00 1A 40 26 9E FB  îH.R........@&žû
    00> 02 B2 CF C2 F7 45 58 6C A9 AA 10 4E 58 D7 CE 74  .²ÏÂ÷EXl©ª.NX×.t
    00> 6B 55 25 C5 F6 DD 7A C4 AE DC A7 57 D8 E9 FB 94  kU%ÅöÝzÄ®Ü§WØéû”
    00> 1D 9E FB 36 C3 B2 28 3D FC BE B0 B3 3A 0C 09 98  .žû6Ã²(=ü¾°³:..˜
    00> FC F5 C7 A2 09 92 50 E0 92 95 D3 FD 51           üõÇ¢.’Pà’•ÓýQ   
    00> :INFO:
    00> :INFO:nrf_dfu_command_req, Handling signed command

## 四、dfu\_handle\_prevalidate ##

*  `dfu_handle_prevalidate`：校验Image固件的哈希值

00> :INFO:dfu_handle_prevalidate, Req version: 2, Present: 2
    00> :INFO:dfu_handle_prevalidate, Init command:
    00> :INFO:
    00> 12 8A 01 0A 44 08 01 12 40 08 02 10 34 1A 02 8C  .Š..D...@...4..Œ
    00> 01 20 00 28 00 30 00 38 94 D6 03 42 24 08 03 12  . .(.0.8”Ö.B$...
    00> 20 0B CD 46 83 80 90 50 6A BC 88 92 02 E4 D8 E2   .ÍFƒ.Pj¼ˆ’.äØâ
    00> 79 12 17 ED 09 76 C6 33 3D B1 8C BB 04 7B 5E 45  y..í.vÆ3=±Œ».{
        ^E
    00> EE 48 00 52 04 08 01 12 00 10 00 1A 40 26 9E FB  îH.R........@&žû
    00> 02 B2 CF C2 F7 45 58 6C A9 AA 10 4E 58 D7 CE 74  .²ÏÂ÷EXl©ª.NX×.t
    00> 6B 55 25 C5 F6 DD 7A C4 AE DC A7 57 D8 E9 FB 94  kU%ÅöÝzÄ®Ü§WØéû”
    00> 1D 9E FB 36 C3 B2 28 3D FC BE B0 B3 3A 0C 09 98  .žû6Ã²(=ü¾°³:..˜
    00> FC F5 C7 A2 09 92 50 E0 92 95 D3 FD 51           üõÇ¢.’Pà’•ÓýQ   
    00> :INFO:
    00> :INFO:dfu_handle_prevalidate, p_Init command:
    00> :INFO:
    00> 08 02 10 34 1A 02 8C 01 20 00 28 00 30 00 38 94  ...4..Œ. .(.0.8”
    00> D6 03 42 24 08 03 12 20 0B CD 46 83 80 90 50 6A  Ö.B$... .ÍFƒ.Pj
    00> BC 88 92 02 E4 D8 E2 79 12 17 ED 09 76 C6 33 3D  ¼ˆ’.äØây..í.vÆ3=
    00> B1 8C BB 04 7B 5E 45 EE 48 00 52 04 08 01 12 00  ±Œ».{
        ^EîH.R.....
    00> :INFO:
    00> :INFO:dfu_handle_prevalidate, Signature
    00> :INFO:
    00> 26 9E FB 02 B2 CF C2 F7 45 58 6C A9 AA 10 4E 58  &žû.²ÏÂ÷EXl©ª.NX
    00> D7 CE 74 6B 55 25 C5 F6 DD 7A C4 AE DC A7 57 D8  ×.tkU%ÅöÝzÄ®Ü§WØ
    00> E9 FB 94 1D 9E FB 36 C3 B2 28 3D FC BE B0 B3 3A  éû”.žû6Ã²(=ü¾°³:
    00> 0C 09 98 FC F5 C7 A2 09 92 50 E0 92 95 D3 FD 51  ..˜üõÇ¢.’Pà’•ÓýQ
    00> :INFO:
    00> :INFO:dfu_handle_prevalidate, signature len: 64
    00> :INFO:dfu_handle_prevalidate, Image verified
    00> :INFO:dfu_handle_prevalidate, Write address set to 0x0002e000
    00> :INFO:dfu_handle_prevalidate, DFU prevalidate SUCCESSFUL!

## 五、nrf\_dfu\_find\_cache ##

*  `nrf_dfu_find_cache`：根据s\_dfu\_settings参数，判断新固件的flash存储地址

00> :INFO:-------------- nrf_dfu_find_cache --------------
    00> :INFO:  free_size=311296
    00> :INFO:  size_req=60180
    00> :INFO:  dual_bank_only=0, p_address=0x20002c08
    00> :INFO:  bank_layout: 0
    00> :INFO:  bank_0.bank_code: 0x01: bank_0.image_size: 60180
    00> :INFO:  bank_1.bank_code: 0x00: bank_1.image_size: 0
    00> :INFO:  free_size before bank select: 311296
    00> :INFO:  free_size: 249856, size_req: 60180
    00> :INFO:  Using bank_1

uint32_t nrf_dfu_find_cache(uint32_t size_req, bool dual_bank_only, uint32_t * p_address)
    {
        
        // TODO: Prevalidate p_address and p_bank
    
        uint32_t free_size =  DFU_REGION_TOTAL_SIZE - DFU_APP_DATA_RESERVED;
        nrf_dfu_bank_t * p_bank;
    
    	
        NRF_LOG_INFO("-------------- nrf_dfu_find_cache --------------\r\n");
        NRF_LOG_INFO("	free_size=%d\r\n", free_size);
        NRF_LOG_INFO("	size_req=%d\r\n", size_req);
    
        // Simple check if size requirement can me met
        if(free_size < size_req)
        {
        
    				NRF_LOG_INFO("	error: free_size < size_req!!!\r\n");
            return NRF_ERROR_NO_MEM;
        }
    
        NRF_LOG_INFO("	dual_bank_only=%d, p_address=0x%08x\r\n", dual_bank_only, (uint32_t)p_address);
        NRF_LOG_INFO("	bank_layout: %d\r\n", s_dfu_settings.bank_layout);
        NRF_LOG_INFO("	bank_0.bank_code: 0x%02x: bank_0.image_size: %d\r\n", s_dfu_settings.bank_0.bank_code, s_dfu_settings.bank_0.image_size);
        NRF_LOG_INFO("	bank_1.bank_code: 0x%02x: bank_1.image_size: %d\r\n", s_dfu_settings.bank_1.bank_code, s_dfu_settings.bank_1.image_size);
    
        // Setting bank_0 as candidate
        p_bank = &s_dfu_settings.bank_0;
    
        // Setting candidate address
        (*p_address) = MAIN_APPLICATION_START_ADDR;
    
        // Calculate free size
        if (s_dfu_settings.bank_0.bank_code == NRF_DFU_BANK_VALID_APP)
        {
        
            // Valid app present.
    
            NRF_LOG_INFO("	free_size before bank select: %d\r\n", free_size);
    
            free_size -= align_to_page(p_bank->image_size, CODE_PAGE_SIZE);
    
            NRF_LOG_INFO("	free_size: %d, size_req: %d\r\n", free_size, size_req);
    
            // Check if we can fit the new in the free space or if removal of old app is required.
            if(size_req > free_size)
            {
        
                // Not enough room in free space (bank_1)
                if ((dual_bank_only))
                {
        
                    NRF_LOG_INFO("	Failure: dual bank restriction\r\n");
                    return NRF_ERROR_NO_MEM;
                }
    
                // Can only support single bank update, clearing old app.
                s_dfu_settings.bank_layout = NRF_DFU_BANK_LAYOUT_SINGLE;
                s_dfu_settings.bank_current = NRF_DFU_CURRENT_BANK_0;
                p_bank = &s_dfu_settings.bank_0;
                NRF_LOG_INFO("	Enforcing single bank\r\n");
            }
            else
            {
        
                // Room in bank_1 for update
                // Ensure we are using dual bank layout
                s_dfu_settings.bank_layout = NRF_DFU_BANK_LAYOUT_DUAL;
                s_dfu_settings.bank_current = NRF_DFU_CURRENT_BANK_1;
                p_bank = &s_dfu_settings.bank_1;
                // Set to first free page boundry after previous app
                (*p_address) += align_to_page(s_dfu_settings.bank_0.image_size, CODE_PAGE_SIZE);
                NRF_LOG_INFO("	Using bank_1\r\n");
            }
        }
        else
        {
        
            // No valid app present. Promoting dual bank.
            s_dfu_settings.bank_layout  = NRF_DFU_BANK_LAYOUT_DUAL;
            s_dfu_settings.bank_current = NRF_DFU_CURRENT_BANK_0;
    
            p_bank = &s_dfu_settings.bank_0;
            NRF_LOG_INFO("	No previous, using bank 0\r\n");
        }
    
        // Set the bank-code to invalid, and reset size/CRC
        memset(p_bank, 0, sizeof(nrf_dfu_bank_t));
    
        // Store the Firmware size in the bank for continuations
        p_bank->image_size = size_req;
        return NRF_SUCCESS;
    }

## 六、nrf\_dfu\_data\_req ##

*  `nrf_dfu_data_req`：新固件数据写入到flash存储地址

00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0xe5ffe6f9
    00> :INFO:  write_offset=0x0
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=0
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0x0
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x8d
    00> :INFO:  progress.cmd_offset=0x8d
    00> :INFO:  progress.cmd_crc=0x385d2a18
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:nrf_dfu_command_req, Setting DFU flag to initialized
    00> :INFO:nrf_dfu_data_req, Valid Data Read info
    00> :INFO:nrf_dfu_data_req, Before OP create
    00> :INFO:nrf_dfu_data_req, Valid Data Create
    00> :INFO:nrf_dfu_flash_erase: 0x0002e000, num: 1
    00> :INFO:nrf_dfu_data_req, Creating object with size: 4096. Offset: 0x00000000, CRC: 0x00000000
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e000, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e100, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e200, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e300, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e400, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e500, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e600, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e700, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e800, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002e900, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ea00, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002eb00, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ec00, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ed00, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ee00, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ef00, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_data_req, Before OP crc
    00> :INFO:nrf_dfu_data_req, Before OP execute
    00> :INFO:nrf_dfu_data_req, Valid Data Execute
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0x43c36595
    00> :INFO:  write_offset=0x1000
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=0
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0x0
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x8d
    00> :INFO:  progress.cmd_offset=0x8d
    00> :INFO:  progress.cmd_crc=0x385d2a18
    00> :INFO:  progress.fw_image_crc=0xc8d01c5f
    00> :INFO:  progress.fw_image_offset=0x1000
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:nrf_dfu_data_req, Before OP create
    00> :INFO:nrf_dfu_data_req, Valid Data Create
    00> :INFO:nrf_dfu_flash_erase: 0x0002f000, num: 1
    00> :INFO:nrf_dfu_data_req, Creating object with size: 4096. Offset: 0x00001000, CRC: 0xc8d01c5f
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f000, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f100, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f200, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f300, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f400, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f500, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f600, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f700, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f800, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002f900, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002fa00, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002fb00, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002fc00, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002fd00, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002fe00, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x0002ff00, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_data_req, Before OP crc
    00> :INFO:nrf_dfu_data_req, Before OP execute
    00> :INFO:nrf_dfu_data_req, Valid Data Execute
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0x12e1649e
    00> :INFO:  write_offset=0x2000
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=0
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0x0
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x8d
    00> :INFO:  progress.cmd_offset=0x8d
    00> :INFO:  progress.cmd_crc=0x385d2a18
    00> :INFO:  progress.fw_image_crc=0xfcd38ab0
    00> :INFO:  progress.fw_image_offset=0x2000
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:nrf_dfu_data_req, Before OP create
    00> :INFO:nrf_dfu_data_req, Valid Data Create
    00> :INFO:nrf_dfu_flash_erase: 0x00030000, num: 1
    00> :INFO:nrf_dfu_data_req, Creating object with size: 4096. Offset: 0x00002000, CRC: 0xfcd38ab0
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030000, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030100, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030200, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030300, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030400, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030500, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030600, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030700, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030800, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030900, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030a00, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030b00, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030c00, src: 0x20002fbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030d00, src: 0x20002cbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030e00, src: 0x20002dbc, len: 64
    00> :INFO:nrf_dfu_flash_store, dest: 0x00030f00, src: 0x20002ebc, len: 64
    00> :INFO:nrf_dfu_data_req, Before OP crc
    00> :INFO:nrf_dfu_data_req, Before OP execute
    00> :INFO:nrf_dfu_data_req, Valid Data Execute

## 七、nrf\_dfu\_postvalidate ##

*  `nrf_dfu_postvalidate`：校验新固件哈希值，并更新s\_dfu\_settings参数

00> :INFO:nrf_dfu_data_req, Waiting for 0 pending flash operations before doing postvalidate.
    00> :INFO:nrf_dfu_data_req, Doing postvalidate
    00> :INFO:nrf_dfu_postvalidate, Current bank is bank 1
    00> :INFO:nrf_dfu_postvalidate, Successfully run the postvalidation check!

## 八、on\_dfu\_complete ##

*  `on_dfu_complete`，dfu传输完成，重启设备

static void on_dfu_complete(fs_evt_t const * const evt, fs_ret_t result)
    {
        
        NRF_LOG_INFO("on_dfu_complete, Resetting device. \r\n");
        (void)nrf_dfu_transports_close();
        NVIC_SystemReset();
        return;
    }

00> :INFO:Waiting for other flash operation to finish.
    00> :INFO:Waiting for other flash operation to finish.
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0xcc92671c
    00> :INFO:  write_offset=0x0
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=1
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0xa7f5f361
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x0
    00> :INFO:  progress.cmd_offset=0x0
    00> :INFO:  progress.cmd_crc=0x0
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:on_dfu_complete, Resetting device. 
    00> :INFO:num transports: 1
    00> :INFO:ble_dfu_transport_close, Waiting for buffers to be cleared before disconnect

## 九、nrf\_dfu\_continue\_bank ##

*  `nrf_dfu_continue_bank`：重启后，继续上次固件分区的操作

00> :INFO:-------------- nrf_dfu_continue_bank -------------- 
    00> :INFO:  src_addr=0x2e000
    00> :INFO:  bank_code=1
    00> :INFO:  image_size=0xeb14
    00> :INFO:  image_crc=0xa7f5f361
    00> :INFO:  Valid App

static uint32_t nrf_dfu_continue_bank(nrf_dfu_bank_t * p_bank, uint32_t src_addr, uint32_t * p_enter_dfu_mode)
    {
        
        uint32_t ret_val = NRF_SUCCESS;
    	
    	NRF_LOG_INFO("-------------- nrf_dfu_continue_bank -------------- \r\n");
        NRF_LOG_INFO("	src_addr=0x%x\r\n", src_addr);
        NRF_LOG_INFO("	bank_code=%d\r\n", p_bank->bank_code);
        NRF_LOG_INFO("	image_size=0x%x\r\n", p_bank->image_size);
        NRF_LOG_INFO("	image_crc=0x%x\r\n", p_bank->image_crc);
    	
        switch (p_bank->bank_code)
        {
        
           case NRF_DFU_BANK_VALID_APP:
                NRF_LOG_INFO("	Valid App\r\n");
                if(s_dfu_settings.bank_current == NRF_DFU_CURRENT_BANK_1)
                {
        
                    // Only continue copying if valid app in bank1
                    ret_val = nrf_dfu_app_continue(src_addr);
                }
                break;
    
           case NRF_DFU_BANK_VALID_SD:
                NRF_LOG_INFO("	Valid SD\r\n");
                // There is a valid SD that needs to be copied (or continued)
                ret_val = nrf_dfu_sd_continue(src_addr, p_bank);
                (*p_enter_dfu_mode) = 1;
                break;
    
            case NRF_DFU_BANK_VALID_BL:
                NRF_LOG_INFO("	Valid BL\r\n");
                // There is a valid BL that must be copied (or continued)
                ret_val = nrf_dfu_bl_continue(src_addr, p_bank);
                break;
    
            case NRF_DFU_BANK_VALID_SD_BL:
                NRF_LOG_INFO("	Single: Valid SD + BL\r\n");
                // There is a valid SD + BL that must be copied (or continued)
                ret_val = nrf_dfu_sd_bl_continue(src_addr, p_bank);
                // Set the bank-code to invalid, and reset size/CRC
                (*p_enter_dfu_mode) = 1;
                break;
    
            case NRF_DFU_BANK_INVALID:
            default:
                NRF_LOG_INFO("	Single: Invalid bank\r\n");
                break;
        }
    
        return ret_val;
    }

## 十、nrf\_dfu\_app\_continue ##

*  `nrf_dfu_app_continue`：新固件从bank1复制到bank0，bank1擦除

00> :INFO:-------------- nrf_dfu_app_continue --------------
    00> :INFO:  src_addr=0x2e000
    00> :INFO:  target_addr=0x2e000
    00> :INFO:nrf_dfu_flash_erase: 0x0001f000, num: 1
    00> :INFO:nrf_dfu_flash_store, dest: 0x0001f000, src: 0x0002e000, len: 4096
    00> :INFO:nrf_dfu_flash_erase: 0x0002e000, num: 1
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0x668b1d2a
    00> :INFO:  write_offset=0x1000
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=1
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0xa7f5f361
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x0
    00> :INFO:  progress.cmd_offset=0x0
    00> :INFO:  progress.cmd_crc=0x0
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:  src_addr=0x2f000
    00> :INFO:  target_addr=0x2f000
    00> :INFO:nrf_dfu_flash_erase: 0x00020000, num: 1
    00> :INFO:nrf_dfu_flash_store, dest: 0x00020000, src: 0x0002f000, len: 4096
    00> :INFO:nrf_dfu_flash_erase: 0x0002f000, num: 1
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0x43d19531
    00> :INFO:  write_offset=0x2000
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=1
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0xa7f5f361
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x0
    00> :INFO:  progress.cmd_offset=0x0
    00> :INFO:  progress.cmd_crc=0x0
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------
    00> :INFO:  src_addr=0x30000
    00> :INFO:  target_addr=0x30000
    00> :INFO:nrf_dfu_flash_erase: 0x00021000, num: 1
    00> :INFO:nrf_dfu_flash_store, dest: 0x00021000, src: 0x00030000, len: 4096
    00> :INFO:nrf_dfu_flash_erase: 0x00030000, num: 1
    00> :INFO:nrf_dfu_flash_erase: 0x0007f000, num: 1
    00> :INFO:-------------- nrf_dfu_settings_write --------------
    00> :INFO:  crc=0xe9c8ef07
    00> :INFO:  write_offset=0x3000
    00> :INFO:  settings_version=1
    00> :INFO:  app_version=2
    00> :INFO:  bootloader_version=0
    00> :INFO:  bank_laytout=0
    00> :INFO:  bank_current=1
    00> :INFO:  bank_0.bank_code=1
    00> :INFO:  bank_0.image_size=0xeb14
    00> :INFO:  bank_0.image_crc=0xa7f5f361
    00> :INFO:  bank_1.bank_code=1
    00> :INFO:  bank_1.image_size=0xeb14
    00> :INFO:  bank_1.image_crc=0xa7f5f361
    00> :INFO:  progress.data_size=0x0
    00> :INFO:  progress.cmd_size=0x0
    00> :INFO:  progress.cmd_offset=0x0
    00> :INFO:  progress.cmd_crc=0x0
    00> :INFO:  progress.fw_image_crc=0x0
    00> :INFO:  progress.fw_image_offset=0x0
    00> :INFO:nrf_dfu_flash_store, dest: 0x0007f000, src: 0x200036cc, len: 87
    00> :INFO:----------------------------------------------------

## 十一、nrf\_dfu\_app\_is\_valid ##

*  `nrf_dfu_app_is_valid`：判断bank0的固件是否有效

00> :INFO:nrf_dfu_app_is_valid, App was valid
    00> :INFO:nrf_dfu_app_is_valid, App was valid

bool nrf_dfu_app_is_valid(void)
    {
        
        if (s_dfu_settings.bank_0.bank_code != NRF_DFU_BANK_VALID_APP)
        {
        
           // Bank 0 has no valid app. Nothing to boot
           NRF_LOG_INFO("nrf_dfu_app_is_valid, app invalid!\r\n");
           return false;
        }
    
        // If CRC == 0, this means CRC check is skipped.
        if (s_dfu_settings.bank_0.image_crc != 0)
        {
        
            uint32_t crc = crc32_compute((uint8_t*) CODE_REGION_1_START,
                                         s_dfu_settings.bank_0.image_size,
                                         NULL);
    
            if (crc != s_dfu_settings.bank_0.image_crc)
            {
        
                // CRC does not match with what is stored.
    						NRF_LOG_INFO("nrf_dfu_app_is_valid. CRC fail: 0x%x!=0x%x\r\n", crc, s_dfu_settings.bank_0.image_crc);
                return  false;
            }
        }
    
        NRF_LOG_INFO("nrf_dfu_app_is_valid, App was valid\r\n");
        return true;
    }

## 十二、nrf\_bootloader\_app\_start ##

*  `nrf_bootloader_app_start`：从bootloader跳转app

if (nrf_dfu_app_is_valid())
    {
        
        NRF_LOG_INFO("Jumping to: 0x%08x\r\n", MAIN_APPLICATION_START_ADDR);
        nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);
    }

void nrf_bootloader_app_start(uint32_t start_addr)
    {
        
        NRF_LOG_INFO("Running nrf_bootloader_app_start with address: 0x%08x\r\n", start_addr);
    
    #ifdef BLE_STACK_SUPPORT_REQD
        uint32_t err_code;
    
        //NRF_LOG_INFO("Initializing SD in mbr\r\n");
        err_code = nrf_dfu_mbr_init_sd();
        if(err_code != NRF_SUCCESS)
        {
        
            NRF_LOG_INFO("Failed running nrf_dfu_mbr_init_sd\r\n");
            return;
        }
    
    #endif
    
        // Disable interrupts
        NRF_LOG_INFO("Disabling interrupts\r\n");
    
        NVIC->ICER[0]=0xFFFFFFFF;
    #if defined(__NRF_NVIC_ISER_COUNT) && __NRF_NVIC_ISER_COUNT == 2
        NVIC->ICER[1]=0xFFFFFFFF;
    #endif
    
    #ifdef BLE_STACK_SUPPORT_REQD
        // Set the sd softdevice vector table base address
        NRF_LOG_INFO("Setting SD vector table base: 0x%08x\r\n", start_addr);
        err_code = sd_softdevice_vector_table_base_set(start_addr);
        if(err_code != NRF_SUCCESS)
        {
        
            NRF_LOG_INFO("Failed running sd_softdevice_vector_table_base_set\r\n");
            return;
        }
    #endif
    
        // Run application
        nrf_bootloader_app_start_impl(start_addr);
    }

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