请教NUC472的UART

只看该作者 · 2016-1-28 21:12

为什么NUC472的uart只有uart0可以通过串口调试助手打印输出呢，其他的uart1-5都不可以呢？

1万 · 2016-1-28 21:34

因为那个是串口配置的是使用的0，你也可以配置为其他的啊。不过默认的是0

只看该作者 · 2016-1-29 09:14

yiyigirl2014 发表于 2016-1-28 21:34
因为那个是串口配置的是使用的0，你也可以配置为其他的啊。不过默认的是0 ...

我配置为其他的了，但是不可以用，uart2和uart0除了引脚配置不同，还有别的不同吗？配置程序如下，麻烦帮我看看，谢谢！
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock                                                                                     */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();

/* Enable External XTAL (4~24 MHz) */
CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk; // XTAL12M (HXT) Enabled

/* Waiting for 12MHz clock ready */
CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);

/* Switch HCLK clock source to HXT */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HXT,CLK_CLKDIV0_HCLK(1));

   /* Set PLL to power down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
CLK->PLLCTL |= CLK_PLLCTL_PD_Msk;

/* Set PLL frequency */
CLK->PLLCTL = CLK_PLLCTL_84MHz_HXT;

/* Waiting for clock ready */
CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);

/* Switch HCLK clock source to PLL */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL,CLK_CLKDIV0_HCLK(1));

   /* Enable IP clock */
// CLK_EnableModuleClock(UART0_MODULE);
   CLK_EnableModuleClock(UART2_MODULE);

/* Select IP clock source */
  //  CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
   CLK_SetModuleClock(UART2_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));

/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();

/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PG multi-function pins for UART0 RXD, TXD */
SYS->GPA_MFPH = SYS_GPA_MFPH_PA13MFP_UART0_RXD | SYS_GPA_MFPH_PA14MFP_UART0_TXD ;

     /* Set GPC multi-function pins for UART2 RXD and TXD */
SYS->GPC_MFPH = SYS_GPC_MFPH_PC10MFP_UART2_RXD | SYS_GPC_MFPH_PC11MFP_UART2_TXD ;

/* Set PB multi-function pins for UART1 RXD, TXD, RTS and CTS */
SYS->GPD_MFPL = SYS_GPD_MFPL_PD4MFP_UART3_RXD | SYS_GPD_MFPL_PD5MFP_UART3_TXD;

/* Lock protected registers */
SYS_LockReg();

}

/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
int main (void)
{
int i;
/* Init System, IP clock and multi-function I/O
   In the end of SYS_Init() will issue SYS_LockReg()
   to lock protected register. If user want to write
   protected register, please issue SYS_UnlockReg()
   to unlock protected register if necessary */
   SYS_Init();

   /* Init UART to 115200-8n1 for print message */
   UART_Open(UART2, 115200);
// UART_Open(UART0, 115200);

   //  printf("\n\nCPU @ %dHz\n", SystemCoreClock);

printf("+-------------------------------------+ \n");
printf("|          GPIO Driver Sample Code | \n");
printf("+-------------------------------------+ \n");

}