/* Private define ------------------------------------------------------------*/
#define TxBufferSize (countof(TxBuffer))
/* Private macro -------------------------------------------------------------*/
#define countof(a) (sizeof(a) / sizeof(*(a)))
/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
u8 TxBuffer[] = "Buffer Send from USART1 to USART2 using Flags";
u8 RxBuffer[TxBufferSize];
这个是什么意思啊
/* Private macro -------------------------------------------------------------*/
#define countof(a) (sizeof(a) / sizeof(*(a)))
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