https://github.com/embeddedalpha/blackshield-bootloader
https://github.com/embeddedalpha/blackshield-bootloader
Last synced: 8 months ago
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- Host: GitHub
- URL: https://github.com/embeddedalpha/blackshield-bootloader
- Owner: embeddedalpha
- Created: 2025-05-28T04:03:51.000Z (11 months ago)
- Default Branch: main
- Last Pushed: 2025-06-30T03:24:26.000Z (9 months ago)
- Last Synced: 2025-06-30T04:29:44.483Z (9 months ago)
- Language: C
- Size: 13.1 MB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Blackshield Bootloader
### Developed for STM32F407. Bootloader's size is 28Kb on STM3232F407
### Jumps to location 0x08010000 where application sits.
### Update system_stm32f4xx.c
```C
#define USER_VECT_TAB_ADDRESS //Uncomment this line
#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 0x00010000U /*!< Vector Table base offset field.
This value must be a multiple of 0x200. */
#endif /* VECT_TAB_SRAM */
#endif /* USER_VECT_TAB_ADDRESS */
```
### Update STM32F407GTX_FLASH.ld linker file
```ld
MEMORY
{
CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 64K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K
FLASH (rx) : ORIGIN = 0x8010000, LENGTH = 448K
}
```
### Application size needs to be updated in the linker file of the bootloader and application.
### Run the PC application to flash the processor
### Command Structure
```
___________________________________________________________________
| | | | | |
| Start of Frame | Command | Length | Payload | End of Frame |
|________________|__________|__________|_________|_________________|
Start of Frame: 0xAA 0x55
Command: 0xA0 - 0xA6
Length: 0-255
Payload: data[0] - data[255]
End of Frame: 0xBB 0x66
```
### Boot and Application Data
16 bytes are reserved for Application Configuration
4 bytes for Application length in bytes
4 bytes for Application CRC in
1 byte for Firmware Version
1 byte for Product ID
1 byte for Product Version
1 byte for App version
```ld
MEMORY
{
CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 64K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K
APP_SPACE (rx) : ORIGIN = 0x08010000, LENGTH = 64K
APP_CONFIG(rw) : ORIGIN = 0x0801FFF0, LENGTH = 16
}
```