ST STM32F105 series

CAN bootloader AN2662
38/83 Doc ID 14156 Rev 1
3 CAN bootloader
3.1 Bootloader code sequence
Figure 25. Bootloader for STM32F105xx and STM32F107xx withCAN2
Once System memory boot mode is entered and the microcontroller has been configured as
described above, the bootloader code waits for a falling edge on the CAN2_Rx pin. When a
detection occurs the CAN Bootloader firmware starts to check the external clock frequency,
Figure 26 shows the flowchart of the frequency check.
&ALLINGEDGEDETECTED
ON#!.2XPIN0"
7AITFORA
COMMAND
'%4CMD
ROUTINE
AI
#HECK(3%FREQUENCY
2$CMD
ROUTINE
OPTIONAL
2OUTINESFOR
LOADING
INTO2!-
'/CMD
ROUTINE
*0TO?!DDRESS
'/CMD
#OMMAND
RECEIVED
'%4CMD