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STM32F401 in debug mode working else not

Mateusz Malinowski

Hi

I have a simple code with uart2. When i running code in debug mode and i have to send 4 bytes of data all data been send but when I off debug button in keil and click reset button on board , code run but only first byte been send. What might be a problem? I think in keil might be a debug mode and release mode? Code stops in while(!(USART2_SR & USART_TXE_FLAG)). Looks like TXE flag is reset and in USART_DR is data to send.

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