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自己编写F280049的在线软件升级BOOTLODER程序，通过CAN总线实现，请求对CAN通道有要求没？用CANA或者CANB都可以实现吗？还是只能用CANA通道？
您可以查看 TRM
4.6.7.6 CAN Boot Mode
The CAN bootloader asynchronously transfers code from CAN-A to internal memory. The host can be any CAN node.
只能使用CAN-A
