想用NUC131单片机UART3作为打印口，但printf没有输出东西，UART10、UART1、UART2作为打印口printf都可以正常输出，请教一下大神们，我的配置是否有问题？？
- void SYS_Init(void)
- {
- /* Enable Internal RC 22.1184MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
- /* Waiting for Internal RC clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
- /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
- /* Enable external XTAL 12MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
- /* Waiting for external XTAL clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
- /* Set core clock as PLL_CLOCK from PLL */
- CLK_SetCoreClock(PLL_CLOCK);
-
- CLK_EnableModuleClock(UART3_MODULE);
- /* Select UART module clock source */
- CLK_SetModuleClock(UART3_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
-
- CLK_EnableModuleClock(UART2_MODULE);
- /* Select UART module clock source */
- CLK_SetModuleClock(UART2_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- // UART3
- SYS->GPA_MFP &= ~(SYS_GPA_MFP_PA5_Msk | SYS_GPA_MFP_PA6_Msk);
- SYS->GPA_MFP |= SYS_GPA_MFP_PA5_UART3_RXD | SYS_GPA_MFP_PA6_UART3_TXD;
- // UART2
- SYS->GPD_MFP &= ~(SYS_GPD_MFP_PD14_Msk | SYS_GPD_MFP_PD15_Msk);
- SYS->GPD_MFP |= SYS_GPD_MFP_PD14_UART2_RXD | SYS_GPD_MFP_PD15_UART2_TXD;
- }
- void UART_Init()
- {
- SYS_ResetModule(UART2_RST);
- UART_Open(UART2, 115200);
- SYS_ResetModule(UART3_RST);
- UART_Open(UART3, 115200);
- }
| 
楼主
果然是这样~~非常感谢
