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AN4286 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN4286
Description  SPI protocol used in the STM32 bootloader
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4286 Datasheet(HTML) 5 Page - STMicroelectronics

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SPI Bootloader code sequence
AN4286
5/38
DocID024458 Rev 2
1
SPI Bootloader code sequence
The STM32 bootloader is an SPI slave.
For all SPI bootloader operations, the NSS pin (chip select) must be tied low. If the NSS pin
is tied high, the communication on the SPI bus will be ignored by the STM32 slave.
Figure 1. Bootloader for STM32 with SPI
Once the system memory boot mode is entered and the STM32 microcontroller has been
configured (for more details, refer to your STM32 system memory boot mode application
note) the bootloader code begins to scan the SPI_MOSI line pin, waiting to detect a
synchronization byte on the bus (0x5A). Once a detection occurs, the SPI bootloader
firmware waits to receive the acknowledge procedure (refer to Figure 2) and then starts to
receive master commands.


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