问题
Is it possible the communication between USART2 and SPI1 in stm32f10x??? I asked because USART2 clock works with APB1 and SPI1 clock works with APB2. and in practice i could have communication between USART1 and SPI1 but couldnt with USART2.
回答1:
Well irrespective of clock , you can communicate with individual peripherals. APB1 and APB2 are just clock sources and it should not impact the communication.
来源：https://stackoverflow.com/questions/24778183/communication-between-usart-and-spi