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SPI Bootloader Host example

This example project acts as a STM32 bootloader SPI host to communicate with another STM32 MCU configured to boot in system memory. The code provided in this example can be programmed onto a STM32L476RG-Nucleo and will use SPI1 as a default interface. The bootloader library can be used with any other STM32 MCU.

SPI Bootloader library functions:

void     BL_Init(SPI_HandleTypeDef *hspi);
void     BL_Get_Command(uint8_t *pData);
uint8_t  BL_GetVersion_Command(void);
uint16_t BL_GetID_Command(void);
void     BL_ReadMemory_Command(uint32_t address, uint8_t nob, uint8_t *pData);
void     BL_Go_Command(uint32_t address);
void     BL_WriteMemory_Command(uint32_t address, uint8_t nob, uint8_t *pData);
void     BL_EraseMemory_Command(uint16_t nb, uint8_t code);
void     BL_WriteProtect_Command(uint8_t nb, uint8_t *codes);
void     BL_WriteUnprotect_Command(void);
void     BL_ReadoutProtect_Command(void);
void     BL_ReadoutUnprotect_Command(void);

More details about the functions listed above can be found in AN4286 SPI protocol used in the STM32 bootloader.

Requirements

  • two STM32

Windows

  • IAR Embedded Workbench
  • STM32 ST-LINK utility

Enable target STM32 MCU to boot in system memory mode

NUCLEO board

Connect BOOT0 to VDD (Place a jumper on pin CN7-5 and CN7-7) Connect SPI1_NSS to GND (Connect CN7-32 to GND)

Refer to AN2606 STM32 microcontroller system memory boot mode for more details on how to enable system memory boot on a particular STM32.

Build

Windows

  1. Double-click on EWARM/Project.eww to open the workspace.

  2. Make

  3. Project > Download > Download active application

SPI Connection

The example project is configured to use SPI1. On a NUCLEO board, the two boards can be connected using the following pins:

  • SPI1_SCK PA5 (CN5-6 or CN10-11)
  • SPI1_MISO PA6 (CN5-5 or CN10-13)
  • SPI1_MOSI PA7 (CN5-4 or CN10-15)
  • GND