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=== UART Bootloader === EFM32 出厂自带 [https://www.silabs.com/documents/public/application-notes/an0003-efm32-uart-bootloader.pdf UART bootloader] 拉高 DBG_SWCLK 通电启动 EFM32 Series 0, EZR32 Series 0, or EFM32 Series 1 即可进入 Uart Bootloader: * The bootloader will check the application space in flash. ** If the application space contains a valid application, the bootloader will run that application. ** If there is not a valid application present, the bootloader will sleep in EM2 to conserve power, while periodically checking the bootloader pins. Note: * DBG_SWCLK has an internal pull-down. Leaving this pin unconnected will not invoke bootloader mode on reset. * DBG_SWDIO is enabled after reset and has a built-in pull-up '''EFM32ZG110 Pin:''' * PIN19 --- PF0 --- DBG_SWCLK / BOOT_TX (This pin is enabled after reset and has a built-in pull down) -----> Serial_RX * PIN20 --- PF1 --- DBG_SWDIO / BOOT_RX (This pin is enabled after reset and has a built-in pull-up) -----> Serial_TX Once the bootloader has been successfully initialized it will print the bootloader version and chip unique ID: <source lang=bash> 1.40 ChipID: F08AB6000B153525 </source> <br><br>
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