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AN3155 bảng dữ liệu(PDF) 5 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  USART protocol used in the STM32 bootloader
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN3155 bảng dữ liệu(HTML) 5 Page - STMicroelectronics

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AN3155
USART bootloader code sequence
1
USART bootloader code sequence
Figure 1. Bootloader for STM32 with USART
Once the system memory boot mode is entered and the STM32 microcontroller has been
configured (for more details refer to application note AN2606 “STM32 system memory boot
mode”) the bootloader code begins to scan the USARTx_RX line pin, waiting to receive the
0x7F data frame: one start bit, 0x7F data bits, even parity bit and one stop bit.
The duration of this data frame is measured using the Systick timer. The count value of the
timer is then used to calculate the corresponding baud rate factor with respect to the current
system clock.
Next, the code initializes the serial interface accordingly. Using this calculated baud rate, an
acknowledge byte (0x79) is returned to the host, which signals that the STM32 is ready to
receive commands.



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