- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Enable Internal RC clock */
- CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
- /* Waiting for IRC22M 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 12MHz XTAL, internal 22.1184MHz */
- CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk);
- /* Enable PLL and Set PLL frequency */
- CLK_SetCoreClock(PLLCON_SETTING);
- /* Waiting for clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);
- /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));
- /* Enable UART module clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Enable PWM module clock */
- CLK_EnableModuleClock(PWM01_MODULE);
- CLK_EnableModuleClock(PWM23_MODULE);
- /* Select UART module clock source */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
- /* Select PWM module clock source */
- CLK_SetModuleClock(PWM01_MODULE, CLK_CLKSEL1_PWM01_S_HXT, 0);
- CLK_SetModuleClock(PWM23_MODULE, CLK_CLKSEL1_PWM23_S_HXT, 0);
- /* Reset PWMA channel0~channel3 */
- SYS_ResetModule(PWM03_RST);
- /* Update System Core Clock */
- SystemCoreClockUpdate();
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set P3 multi-function pins for UART RXD and TXD */
- SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
- SYS->P3_MFP |= (SYS_MFP_P30_RXD | SYS_MFP_P31_TXD);
- /* Set P2 multi-function pins for PWMA Channel0~3 */
- SYS->P2_MFP &= ~(SYS_MFP_P20_Msk | SYS_MFP_P21_Msk | SYS_MFP_P22_Msk | SYS_MFP_P23_Msk);
- SYS->P2_MFP |= (SYS_MFP_P20_PWM0 | SYS_MFP_P21_PWM1 | SYS_MFP_P22_PWM2 | SYS_MFP_P23_PWM3);
- }
| 
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