M058S的时钟初始化示例将寄存器操作改写成库函数操作

    /* Enable Internal RC 22.1184MHz clock */

    CLK->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;



    /* Waiting for Internal RC clock ready */

    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));



    /* Switch HCLK clock source to Internal RC and and HCLK source divide 1 */

    CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;

    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;

    CLK->CLKDIV &= ~CLK_CLKDIV_HCLK_N_Msk;

    CLK->CLKDIV |= CLK_CLKDIV_HCLK(1);



    /* Enable external XTAL 12MHz clock */

    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;



    /* Waiting for external XTAL clock ready */

    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk));



    /* Set core clock as PLL_CLOCK from PLL */

    CLK->PLLCON = PLLCON_SETTING;

    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk));

    CLK->CLKSEL0 &= (~CLK_CLKSEL0_HCLK_S_Msk);

    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_PLL;



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */

    //SystemCoreClockUpdate();

    PllClock        = PLL_CLOCK;            // PLL

    SystemCoreClock = PLL_CLOCK / 1;        // HCLK

    CyclesPerUs     = PLL_CLOCK / 1000000;  // For SYS_SysTickDelay()



    /* Enable UART module clock */

    CLK->APBCLK |= CLK_APBCLK_UART0_EN_Msk;



    /* Select UART module clock source */

    CLK->CLKSEL1 &= ~CLK_CLKSEL1_UART_S_Msk;

    CLK->CLKSEL1 |= CLK_CLKSEL1_UART_S_HXT;

 CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);

        CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);

        CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC,CLK_CLKDIV_HCLK(1));

        

        CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);

        CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);

        

        CLK_EnablePLL(CLK_PLLCON_PLL_SRC_HXT,FREQ_50MHZ);

        CLK_SetCoreClock(FREQ_50MHZ);



        CLK_EnableModuleClock(UART0_MODULE);

        CLK_SetModuleClock(UART0_MODULE,CLK_CLKSEL1_UART_S_HXT,CLK_CLKDIV_UART(1));