8051 series MCU firmware upgrade IAP

8051 Series MCU firmware upgrade iap

Statement ：
#define UPGRADE_FLAG 0xaa // Upgrade flag bit
#define APP_START_ADDR 0x0000 //bootloader Initial address
#define APP_FLAG_ADDR 0x1800 // Upgrade flag bit address
#define APP_START_ADDR 0x2000 //app Run from address

Bootloader Environment settings ：

1. find *.A51 file , take START_APPLICATION EQU 0 Rewrite into START_APPLICATION EQU 2000h, among 2000h By definition app Running address

App Environment settings ：

1. Set up app Operation address and range ：Flash->configuer Flash Tools…->Target. modify app Run from address and size ;

2. Modify the interrupt vector offset address , Modified into app Run from address 2000, Note that the code optimization level cannot exceed 8;
notes ：Interrupt vectors at adderss: Interrupt offset address
Level: Code optimization level

3. Modify the program burning address ：Flash->configuer Flash Tools…->LX51 Locate Remove the tick , stay User classes To write app Run burning address
CODE (C:0x2000-C:0x3FFE), CONST (C:0x2000-C:0x3FFE),
ECODE (C:0x2000-C:0x3FFE), HCONST (C:0x2000-C:0x3FFE)
My starting address is 2000H The size is 1FFFH So the scope is 0x2000-C:0x3FFE

Tips ： If the option is Flash->configuer Flash Tools…->BL51 Locates when , Get rid of the hook , stay Code Range: Fill in as 0X2000-0X3FFF;
4. find *.a51 file , take CSEG AT 0 Change to CSEG AT 2000H;

Tips ： stay bootloader Try not to interrupt ,8051 There is no interrupt mapping function .