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並前往https://stackoverflow.com/questions/61196677/libopencm3-1-wire-over-uart-dma-stm32f1

LibOpenCM3 1-Wire over UART DMA STM32F1

Ok, so rcc_periph_clock_enable(RCC_USART2);. was missing so USART2 can't do its job. I can send and receive data now.

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