为何HAL_UART_Transmit可发送，改成HAL_UART_Transmit_IT就不行了
cube配置的
STM32f407系统
其他代码均一样
while(HAL_OK != HAL_UART_Transmit_IT(DEFAULT_UART, (uint8_t*)UartTxBuffer, index)); //不行
while(HAL_OK != HAL_UART_Transmit(DEFAULT_UART, (uint8_t*)UartTxBuffer, index, 0xFFFF)); //可以
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搞定，见21楼
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