STM32F0xx Standard Peripherals Firmware Library: main.c Source File

00001 /**
00002   ******************************************************************************
00003   * @file    RCC/RCC_Example/main.c 
00004   * @author  MCD Application Team
00005   * @version V1.4.0
00006   * @date    24-July-2014
00007   * @brief   Main program body
00008   ******************************************************************************
00009   * @attention
00010   *
00011   * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
00012   *
00013   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
00014   * You may not use this file except in compliance with the License.
00015   * You may obtain a copy of the License at:
00016   *
00017   *        http://www.st.com/software_license_agreement_liberty_v2
00018   *
00019   * Unless required by applicable law or agreed to in writing, software 
00020   * distributed under the License is distributed on an "AS IS" BASIS, 
00021   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00022   * See the License for the specific language governing permissions and
00023   * limitations under the License.
00024   *
00025   ******************************************************************************
00026   */
00027 
00028 /* Includes ------------------------------------------------------------------*/
00029 #include "main.h"
00030 
00031 /** @addtogroup STM32F0xx_StdPeriph_Examples
00032   * @{
00033   */
00034 
00035 /** @addtogroup RCC_Example
00036   * @{
00037   */
00038 
00039 /* Private typedef -----------------------------------------------------------*/
00040 /* Private define ------------------------------------------------------------*/
00041 /* Private macro -------------------------------------------------------------*/
00042 /* Private variables ---------------------------------------------------------*/
00043 /* Private function prototypes -----------------------------------------------*/
00044 /* Private functions ---------------------------------------------------------*/
00045 
00046 /**
00047   * @brief  Main program.
00048   * @param  None
00049   * @retval None
00050   */
00051 int main(void)
00052 {
00053  GPIO_InitTypeDef GPIO_InitStructure;
00054  NVIC_InitTypeDef NVIC_InitStructure;
00055  RCC_ClocksTypeDef RCC_ClockFreq;
00056 
00057   /*!< At this stage the microcontroller clock setting is already configured, 
00058        this is done through SystemInit() function which is called from startup
00059        file (startup_stm32f0xx.s) before to branch to application main.
00060        To reconfigure the default setting of SystemInit() function, refer to
00061        system_stm32f0xx.c file
00062      */     
00063 
00064   /* Initialize Leds mounted on STM32072B-EVAL*/
00065   STM_EVAL_LEDInit(LED3);
00066   STM_EVAL_LEDInit(LED4);
00067 
00068   /* Turn on LED3 and LED4 */
00069   STM_EVAL_LEDOn(LED3);
00070   STM_EVAL_LEDOn(LED4);
00071 
00072   /* This function fills the RCC_ClockFreq structure with the current
00073      frequencies of different on chip clocks (for debug purpose) **************/
00074   RCC_GetClocksFreq(&RCC_ClockFreq);
00075 
00076   /* Enable Clock Security System(CSS): this will generate an NMI exception
00077   when HSE clock fails *****************************************************/
00078   RCC_ClockSecuritySystemCmd(ENABLE);
00079 
00080   /* Enable and configure RCC global IRQ channel, will be used to manage HSE ready 
00081      and PLL ready interrupts. 
00082      These interrupts are enabled in stm32f0xx_it.c file **********************/
00083 #ifdef USE_STM320518_EVAL
00084   NVIC_InitStructure.NVIC_IRQChannel = RCC_IRQn;
00085 #else 
00086   NVIC_InitStructure.NVIC_IRQChannel = RCC_CRS_IRQn; 
00087 #endif /* USE_STM320518_EVAL */
00088   NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
00089   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
00090   NVIC_Init(&NVIC_InitStructure);
00091 
00092   /* Output HSE clock on MCO1 pin(PA8) ****************************************/     
00093   /* Enable the GPIOA Clock */
00094   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
00095 
00096   /* MCO pin configuration: PA8 */
00097   GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
00098   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
00099   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
00100   GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
00101   GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_8;
00102   GPIO_Init(GPIOA, &GPIO_InitStructure);
00103 
00104   GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_0);
00105 
00106   /* Output System Clock on MCO pin */
00107 #ifdef USE_STM320518_EVAL
00108   RCC_MCOConfig(RCC_MCOSource_SYSCLK); 
00109 #else 
00110   RCC_MCOConfig(RCC_MCOSource_SYSCLK, RCC_MCOPrescaler_1);  
00111 #endif /* USE_STM320518_EVAL */   
00112 
00113   while (1)
00114   {
00115     /* Toggle LED4 */
00116     STM_EVAL_LEDToggle(LED4);
00117 
00118     /* Insert a delay */
00119     Delay(0x4FFFF);
00120 
00121     /* Toggle LED3 */
00122     STM_EVAL_LEDToggle(LED3);
00123 
00124     /* Insert a delay */
00125     Delay(0x3FFFF);
00126   }
00127 }
00128 
00129 /**
00130   * @brief  Inserts a delay time.
00131   * @param  nCount: specifies the delay time length.
00132   * @retval None
00133   */
00134 void Delay(__IO uint32_t nCount)
00135 {
00136   /* Decrement nCount value */
00137   while (nCount != 0)
00138   {
00139     nCount--;
00140   }
00141 }
00142 
00143 #ifdef  USE_FULL_ASSERT
00144 
00145 /**
00146   * @brief  Reports the name of the source file and the source line number
00147   *         where the assert_param error has occurred.
00148   * @param  file: pointer to the source file name
00149   * @param  line: assert_param error line source number
00150   * @retval None
00151   */
00152 void assert_failed(uint8_t* file, uint32_t line)
00153 { 
00154   /* User can add his own implementation to report the file name and line number,
00155      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
00156 
00157   /* Infinite loop */
00158   while (1)
00159   {
00160   }
00161 }
00162 #endif
00163 
00164 /**
00165   * @}
00166   */
00167 
00168 /**
00169   * @}
00170   */
00171 
00172 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/