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USB Error while transmitting UART

Question asked by chuev.vladimir on Nov 8, 2017
Latest reply on Nov 13, 2017 by chuev.vladimir

I'm using STM32F401CBUX

I have a USB HID that works well

But when I call HAL_UART_Transmit_IT/HAL_UART_Transmit_DMA/HAL_UART_Transmit, there's a USB cliff on the host side

 

What could be the matter? I don't understand anything

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