diff options
Diffstat (limited to 'src/stm32lib/examples/RCC/main.c')
| -rwxr-xr-x | src/stm32lib/examples/RCC/main.c | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/src/stm32lib/examples/RCC/main.c b/src/stm32lib/examples/RCC/main.c new file mode 100755 index 0000000..59ccf7d --- /dev/null +++ b/src/stm32lib/examples/RCC/main.c @@ -0,0 +1,507 @@ +/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
+* File Name : main.c
+* Author : MCD Application Team
+* Version : V2.0.1
+* Date : 06/13/2008
+* Description : Main program body.
+********************************************************************************
+* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*******************************************************************************/
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define DELAY_COUNT 0xFFFFF
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+GPIO_InitTypeDef GPIO_InitStructure;
+RCC_ClocksTypeDef RCC_ClockFreq;
+ErrorStatus HSEStartUpStatus;
+
+/* Private function prototypes -----------------------------------------------*/
+void SetSysClock(void);
+void SetSysClockToHSE(void);
+void SetSysClockTo20(void);
+void SetSysClockTo36(void);
+void SetSysClockTo48(void);
+void SetSysClockTo72(void);
+void NVIC_Configuration(void);
+void Delay(vu32 nCount);
+
+
+/* Private functions ---------------------------------------------------------*/
+/*******************************************************************************
+* Function Name : main
+* Description : Main program.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+int main(void)
+{
+#ifdef DEBUG
+ debug();
+#endif
+
+ /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */
+ SetSysClock();
+
+ /* This function fills the RCC_ClockFreq structure with the current
+ frequencies of different on chip clocks (for debug purpose) */
+ RCC_GetClocksFreq(&RCC_ClockFreq);
+
+ /* Enable Clock Security System(CSS): this will generate an NMI exception
+ when HSE clock fails */
+ RCC_ClockSecuritySystemCmd(ENABLE);
+
+ /* NVIC configuration ------------------------------------------------------*/
+ NVIC_Configuration();
+
+ /* Enable GPIO_LED and GPIOA clock -----------------------------------------*/
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_LED | RCC_APB2Periph_GPIOA, ENABLE);
+
+ /* Configure GPIO_LED Pin 6, Pin 7, Pin 8 and Pin 9 as Output push-pull ----*/
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+ GPIO_Init(GPIO_LED, &GPIO_InitStructure);
+
+ /* Turn on Leds connected to GPIO_LED Pin 7 and Pin 9 */
+ GPIO_Write(GPIO_LED, GPIO_Pin_7 | GPIO_Pin_9);
+
+ /* Output HSE clock on MCO pin */
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+ GPIO_Init(GPIOA, &GPIO_InitStructure);
+ RCC_MCOConfig(RCC_MCO_HSE);
+
+ /* Toggle leds connected to GPIO_LED Pin 6, Pin 7, Pin 8 and Pin 9 pins */
+ while (1)
+ {
+ GPIO_Write(GPIO_LED, (u16)~GPIO_ReadOutputData(GPIO_LED));
+
+ /* Insert a delay */
+ Delay(DELAY_COUNT);
+ }
+}
+
+/*******************************************************************************
+* Function Name : SetSysClock
+* Description : Configures the System clock frequency, HCLK, PCLK2 and PCLK1
+* prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClock(void)
+{
+#if defined SYSCLK_HSE
+ SetSysClockToHSE();
+#elif defined SYSCLK_FREQ_20MHz
+ SetSysClockTo20();
+#elif defined SYSCLK_FREQ_36MHz
+ SetSysClockTo36();
+#elif defined SYSCLK_FREQ_48MHz
+ SetSysClockTo48();
+#elif defined SYSCLK_FREQ_72MHz
+ SetSysClockTo72();
+#endif
+
+ /* If none of the define above is enabled, the HSI is used as System clock
+ source (default after reset) */
+}
+
+/*******************************************************************************
+* Function Name : SetSysClockToHSE
+* Description : Selects HSE as System clock source and configure HCLK, PCLK2
+* and PCLK1 prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClockToHSE(void)
+{
+ /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 0 wait state */
+ FLASH_SetLatency(FLASH_Latency_0);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK */
+ RCC_PCLK1Config(RCC_HCLK_Div1);
+
+ /* Select HSE as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
+
+ /* Wait till PLL is used as system clock source */
+ while (RCC_GetSYSCLKSource() != 0x04)
+ {
+ }
+ }
+ else
+ { /* If HSE fails to start-up, the application will have wrong clock configuration.
+ User can add here some code to deal with this error */
+
+ /* Go to infinite loop */
+ while (1)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : SetSysClockTo20
+* Description : Sets System clock frequency to 20MHz and configure HCLK, PCLK2
+* and PCLK1 prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClockTo20(void)
+{
+ /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 0 wait state */
+ FLASH_SetLatency(FLASH_Latency_0);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK */
+ RCC_PCLK1Config(RCC_HCLK_Div1);
+
+ /* PLLCLK = (8MHz / 2) * 5 = 20 MHz */
+ RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_5);
+
+ /* Enable PLL */
+ RCC_PLLCmd(ENABLE);
+
+ /* Wait till PLL is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+ {
+ }
+
+ /* Select PLL as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+ /* Wait till PLL is used as system clock source */
+ while (RCC_GetSYSCLKSource() != 0x08)
+ {
+ }
+ }
+ else
+ { /* If HSE fails to start-up, the application will have wrong clock configuration.
+ User can add here some code to deal with this error */
+
+ /* Go to infinite loop */
+ while (1)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : SetSysClockTo36
+* Description : Sets System clock frequency to 36MHz and configure HCLK, PCLK2
+* and PCLK1 prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClockTo36(void)
+{
+ /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 1 wait state */
+ FLASH_SetLatency(FLASH_Latency_1);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK */
+ RCC_PCLK1Config(RCC_HCLK_Div1);
+
+ /* PLLCLK = (8MHz / 2) * 9 = 36 MHz */
+ RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_9);
+
+ /* Enable PLL */
+ RCC_PLLCmd(ENABLE);
+
+ /* Wait till PLL is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+ {
+ }
+
+ /* Select PLL as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+ /* Wait till PLL is used as system clock source */
+ while (RCC_GetSYSCLKSource() != 0x08)
+ {
+ }
+ }
+ else
+ { /* If HSE fails to start-up, the application will have wrong clock configuration.
+ User can add here some code to deal with this error */
+
+ /* Go to infinite loop */
+ while (1)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : SetSysClockTo48
+* Description : Sets System clock frequency to 48MHz and configure HCLK, PCLK2
+* and PCLK1 prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClockTo48(void)
+{
+ /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 1 wait state */
+ FLASH_SetLatency(FLASH_Latency_1);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK/2 */
+ RCC_PCLK1Config(RCC_HCLK_Div2);
+
+ /* PLLCLK = 8MHz * 6 = 48 MHz */
+ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_6);
+
+ /* Enable PLL */
+ RCC_PLLCmd(ENABLE);
+
+ /* Wait till PLL is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+ {
+ }
+
+ /* Select PLL as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+ /* Wait till PLL is used as system clock source */
+ while (RCC_GetSYSCLKSource() != 0x08)
+ {
+ }
+ }
+ else
+ { /* If HSE fails to start-up, the application will have wrong clock configuration.
+ User can add here some code to deal with this error */
+
+ /* Go to infinite loop */
+ while (1)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : SetSysClockTo72
+* Description : Sets System clock frequency to 72MHz and configure HCLK, PCLK2
+* and PCLK1 prescalers.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void SetSysClockTo72(void)
+{
+ /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 2 wait state */
+ FLASH_SetLatency(FLASH_Latency_2);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK/2 */
+ RCC_PCLK1Config(RCC_HCLK_Div2);
+
+ /* PLLCLK = 8MHz * 9 = 72 MHz */
+ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
+
+ /* Enable PLL */
+ RCC_PLLCmd(ENABLE);
+
+ /* Wait till PLL is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+ {
+ }
+
+ /* Select PLL as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+ /* Wait till PLL is used as system clock source */
+ while(RCC_GetSYSCLKSource() != 0x08)
+ {
+ }
+ }
+ else
+ { /* If HSE fails to start-up, the application will have wrong clock configuration.
+ User can add here some code to deal with this error */
+
+ /* Go to infinite loop */
+ while (1)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : NVIC_Configuration
+* Description : Configures Vector Table base location.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void NVIC_Configuration(void)
+{
+ NVIC_InitTypeDef NVIC_InitStructure;
+
+#ifdef VECT_TAB_RAM
+ /* Set the Vector Table base location at 0x20000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
+#else /* VECT_TAB_FLASH */
+ /* Set the Vector Table base location at 0x08000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
+#endif
+
+ /* Enable and configure RCC global IRQ channel */
+ NVIC_InitStructure.NVIC_IRQChannel = RCC_IRQChannel;
+ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+ NVIC_Init(&NVIC_InitStructure);
+}
+
+/*******************************************************************************
+* Function Name : Delay
+* Description : Inserts a delay time.
+* Input : nCount: specifies the delay time length.
+* Output : None
+* Return : None
+*******************************************************************************/
+void Delay(vu32 nCount)
+{
+ for(; nCount!= 0;nCount--);
+}
+
+#ifdef DEBUG
+/*******************************************************************************
+* Function Name : assert_failed
+* Description : Reports the name of the source file and the source line number
+* where the assert_param error has occurred.
+* Input : - file: pointer to the source file name
+* - line: assert_param error line source number
+* Output : None
+* Return : None
+*******************************************************************************/
+void assert_failed(u8* file, u32 line)
+{
+ /* User can add his own implementation to report the file name and line number,
+ ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+ /* Infinite loop */
+ while (1)
+ {
+ }
+}
+#endif
+
+/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
|