最近在除錯stm32串列埠，發現串列埠傳送資料總是進入如下死迴圈
while(usart_getflagstatus(uart5, usart_flag_txe) == reset);rcc_apb1periphclockcmd(rcc_apb1periph_uart5, enable); //開啟串列埠時鐘void uart_init(void)
{ /* 定義結構體變數 */
gpio_inittypedef gpio_initstructure;
usart_inittypedef usart_initstructure;
nvic_inittypedef nvic_initstructure;
/*開啟時鐘 */
rcc_apb2periphclockcmd(rcc_apb2periph_usart1 | rcc_apb2periph_gpioa | rcc_apb2periph_gpiob, enable); //ê¹äüusart1£¬gpioaê±öó
rcc_apb1periphclockcmd(rcc_apb1periph_uart5, enable); //ê¹äüusart1£¬gpioaê±öó
/* 初始化gpio口*/
//rs4851 usart1_tx gpioa.9
gpio_initstructure.gpio_pin = gpio_pin_9;
gpio_initstructure.gpio_speed = gpio_speed_50mhz;
gpio_initstructure.gpio_mode = gpio_mode_af_pp; //¸´óãíæíìêä³ö
gpio_init(gpioa, &gpio_initstructure);//³õê¼»¯gpioa.9
//usart1_rx gpioa.10³õê¼»¯
gpio_initstructure.gpio_pin = gpio_pin_10;//pa10
gpio_initstructure.gpio_mode = gpio_mode_in_floating;//¸¡¿õêäèë
gpio_init(gpioa, &gpio_initstructure);//³õê¼»¯gpioa.10
//rs4851 re/de
gpio_initstructure.gpio_pin = gpio_pin_0;//pb0
gpio_initstructure.gpio_speed = gpio_speed_50mhz;
gpio_initstructure.gpio_mode = gpio_mode_out_pp;// íæíìêä³ö
gpio_init(gpiob, &gpio_initstructure);
//uart5_tx gpioc.12
gpio_initstructure.gpio_pin = gpio_pin_12; //pc12
gpio_initstructure.gpio_speed = gpio_speed_50mhz;
gpio_initstructure.gpio_mode = gpio_mode_af_pp; //¸´óãíæíìêä³ö
gpio_init(gpioc, &gpio_initstructure);//³õê¼»¯pc12
//uart5_rx gpiod.2³õê¼»¯
gpio_initstructure.gpio_pin = gpio_pin_2;//pd2
gpio_initstructure.gpio_mode = gpio_mode_in_floating;//¸¡¿õêäèë
gpio_init(gpiod, &gpio_initstructure);//³õê¼»¯gpiod.2
/* nvicåäöã */
//usart1 nvic åäöã
nvic_initstructure.nvic_irqchannel = usart1_irqn;
nvic_initstructure.nvic_irqchannelpreemptionpriority = 3 ; //çàõ¼óåï輶3
nvic_initstructure.nvic_irqchannelsubpriority = 3; //×óóåï輶3
nvic_initstructure.nvic_irqchannelcmd = enable; //irqí¨µàê¹äü
nvic_init(&nvic_initstructure); //¸ù¾ýö¸¶¨µä²îêý³õê¼»¯vic¼ä´ææ÷
//uart5 nvic åäöã
nvic_initstructure.nvic_irqchannel = uart5_irqn;
nvic_initstructure.nvic_irqchannelpreemptionpriority = 3 ; //çàõ¼óåï輶3
nvic_initstructure.nvic_irqchannelsubpriority = 2; //×óóåï輶2
nvic_initstructure.nvic_irqchannelcmd = enable; //irqí¨µàê¹äü
nvic_init(&nvic_initstructure); //¸ù¾ýö¸¶¨µä²îêý³õê¼»¯vic¼ä´ææ÷
/* usartåäöã */
//usart1 ³õê¼»¯éèöã
usart_initstructure.usart_baudrate = 9600;//´®¿ú²¨ìøâê
usart_initstructure.usart_wordlength = usart_wordlength_8b;//×ö³¤îª8î»êý¾ý¸ñê½
usart_initstructure.usart_stopbits = usart_stopbits_1;//ò»¸öí£ö¹î»
usart_initstructure.usart_parity = usart_parity_no;//îþææå¼ð£ñéî»
usart_initstructure.usart_hardwareflowcontrol = usart_hardwareflowcontrol_none;//îþó²¼þêý¾ýá÷¿øöæ
usart_initstructure.usart_mode = usart_mode_rx | usart_mode_tx; //êõ·¢ä£ê½
usart_init(usart1, &usart_initstructure); //³õê¼»¯´®¿ú1
//uart5 ³õê¼»¯éèöã
usart_initstructure.usart_baudrate = 9600;//´®¿ú²¨ìøâê
usart_initstructure.usart_wordlength = usart_wordlength_8b;//×ö³¤îª8î»êý¾ý¸ñê½
usart_initstructure.usart_stopbits = usart_stopbits_1;//ò»¸öí£ö¹î»
usart_initstructure.usart_parity = usart_parity_no;//îþææå¼ð£ñéî»
usart_initstructure.usart_hardwareflowcontrol = usart_hardwareflowcontrol_none;//îþó²¼þêý¾ýá÷¿øöæ
usart_initstructure.usart_mode = usart_mode_rx | usart_mode_tx; //êõ·¢ä£ê½
usart_init(uart5, &usart_initstructure); //³õê¼»¯´®¿ú5
usart_itconfig(usart1, usart_it_rxne, enable); //¿ªæô´®¿ú1½óêüöð¶ï
usart_itconfig(uart5, usart_it_rxne, enable); //¿ªæô´®¿ú5½óêüöð¶ï
usart_cmd(usart1, enable); //ê¹äü´®¿ú1
usart_cmd(uart5, enable); //ê¹äü´®¿ú5
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