STM8S——Clock control（CLK）

 1 /* Includes ------------------------------------------------------------------*/
 2 #include "stm8s.h"
 3 
 4 /* Private function prototypes -----------------------------------------------*/
 5 static void CLK_Config(void);
 6 
 7 /**
 8   * @brief Example  main entry point.
 9   * @param  None
10   * @retval None
11   */
12 void main(void)
13 {
14   
15   // Clock configuration
16   CLK_Config();
17   
18   enableInterrupts();
19   
20   // configures the Switch from one clock to another
21   CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE);
22   
23   // Connect LSI to COO pin , CLK_CCO--PE0
24   GPIO_Init(GPIOE, GPIO_PIN_0, GPIO_MODE_OUT_PP_LOW_FAST);
25   
26   // Enables the Configurable Clock Output (CCO)
27   CLK_CCOCmd(ENABLE);  
28   
29   /* --- to see if 8mhz is output at CCo pin --- */
30   
31   /* ------------------------------------------- */
32 }
33 
34 /**
35   * @brief  Configure system clock to run at 16Mhz and output the system clock on
36   *         CCO pin
37   * @param  None
38   * @retval None
39   */
40 static void CLK_Config(void)
41 {
42   CLK_DeInit();
43   
44   /* Clock divider to HSI/1 */
45   CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
46   
47   /* Output Fcpu on CLK_CCO pin */
48   CLK_CCOConfig(CLK_OUTPUT_MASTER);
49 }