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CC2630 如何实现自定义串口升级

Other Parts Discussed in Thread: CC2530, TIMAC, CC2630, CC2640, CC1310

设备对外只有串口两根线,无法更改。协议栈一直使用TIMAC。 之前用CC2530时候参考它的bootloader实现了串口升级,在bootloader中下载更新,然后跳转到app运行。现在换成CC2630后没有找到串口的bootloader的参考,而CC2630自带的串口下载功能需要通过IO触发,而我们外部没有IO可控,只有TX/RX。并且协议也没法兼容。

请问CC2630如何实现自定义的串口升级。只能通过TX/RX两根线,不能有多余的外部控制。