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並前往https://stackoverflow.com/questions/64626215/using-stm32f042-as-spi-slave

using stm32f042 as spi slave - Stack Overflow

When you call HAL_SPI_Receive(&hspi1, (uint8_t *)spi_buf, 1, 100); that is the stm32 in the act of listening. Specifically, it will wait 100 ...

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