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程序如下：
调试卡在了程序中加粗一句，求助！ 谢谢各路大神！！！ #include <STM32f4xx.h> #include void RCC_Configuration(void); //ʱÖÓÅäÖà void USART1_Configuration(void); //´®¿Ú1ÅäÖà int main(void) { uint16_t i = 0; RCC_Configuration(); USART1_Configuration(); //USART1_NVIC_Configuration(); //DMA_Configuration(); //DMA_NVIC_Configuration(); while(1) { if(USART_GetFlagStatus(USART1,USART_IT_RXNE) == SET) { USART_SendData(USART1,USART_ReceiveData(USART1)); for(i = 0;i < 500;i++); } } } /*ʱÖÓ*/ void RCC_Configuration(void) //ʱÖÓÅäÖà { ErrorStatus HSEStartUp; //ö¾ÙÐͱäÁ¿£¬½ÓÊÜHSEÆðÕñ·µ»ØÖµ RCC_DeInit(); //ȱʡRCC¼Ä´æÆ÷ RCC_HSEConfig(RCC_HSE_ON); //¿ªÆôHSE,HSE=8M HSEStartUp = RCC_WaitForHSEStartUp(); //µÈ´ýHSEÆðÕñ if(HSEStartUp == SUCCESS) //ÆðÕñ³É¹¦ { RCC_PLLConfig(RCC_PLLSource_HSE,4,288,4,8); //VCOIN=4M,VCOOUT=288M,PLL=72M,others=36M RCC_HCLKConfig(RCC_SYSCLK_Div1); //AHB=SYSCLK 72M RCC_PCLK1Config(RCC_HCLK_Div2); //CLK1=AHB/2 36M RCC_PCLK2Config(RCC_HCLK_Div2); //CLK2=AHB/2 36M /*ÑÓʱFLASH 2¸öÖÜÆÚ£¬Ê¹ÄÜÔ¤¶Á»º´æ£¨±ØÐëµÄ£©*/ FLASH_SetLatency(FLASH_Latency_2); FLASH_PrefetchBufferCmd(ENABLE); RCC_PLLCmd(ENABLE); //ʹÄÜPLL while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //µÈ´ýPLL¾ÍÐ÷ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Ñ¡ÔñPLLΪSYSCLK while(RCC_GetSYSCLKSource() != 0x08); //µÈ´ýϵͳʱÖÓ¾ÍÐ÷ } } /*´®¿Ú1*/ void USART1_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; //³õʼ»¯GPIO½á¹¹Ìå USART_InitTypeDef USART_InitStructure; //³õʼ»¯USART½á¹¹Ìå RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //ʹÄÜGPIOAʱÖÓ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //ʹÄÜUSART1ʱÖÓ /*ÅäÖÃUSART1µÄGPIO*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //Ñ¡ÖйܽÅ9 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //¸´Óù¦ÄÜ GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //ÍÆÍìÊä³ö GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //I/O¿Ú×î¸ß· תƵÂÊ50MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //ÉÏÀ µç×è GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //¿ªÂ©Êä³ö GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //ÎÞÉÏÏÂÀ µç×è GPIO_Init(GPIOA,&GPIO_InitStructure); /*ÅäÖÃUSART1µÄģʽ*/ USART_InitStructure.USART_BaudRate = 9600; //²¨ÌØÂÊΪ9600 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //×Ö³¤Îª8bit USART_InitStructure.USART_StopBits = USART_StopBits_1; //1λֹͣλ USART_InitStructure.USART_Parity = USART_Parity_No; //ÎÞÆæżЧÑé USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //²»Ö§³ÖÁ÷Á¿¿ØÖÆ USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ģʽ USART_Init(USART1,&USART_InitStructure); //USART_ITConfig(USART1,USART_IT_RXNE,ENABLE); //ʹÄÜUSART1½ÓÊܼĴæÆ÷·Ç¿Õʱ²úÉúÖÐ¶Ï USART_Cmd(USART1,ENABLE); //ʹÄÜ´®¿Ú1 //USART_ClearFlag(USART1,USART_FLAG_TC); } 
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