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STM8S/A Standard Peripherals Firmware Library
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STM8S_StdPeriph_Examples/CLK/CLK_ClockSelection/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file CLK_ClockSelection\main.c 00004 * @brief This file contains the main function for the CLK Clock Selection example. 00005 * @author MCD Application Team 00006 * @version V2.2.0 00007 * @date 30-September-2014 00008 ****************************************************************************** 00009 * @attention 00010 * 00011 * <h2><center>© 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 "stm8s.h" 00030 #include "stm8s_eval.h" 00031 #include "stm8s_eval_lcd.h" 00032 00033 /** 00034 * @addtogroup CLK_ClockSelection 00035 * @{ 00036 */ 00037 00038 /* Private typedef -----------------------------------------------------------*/ 00039 /* Private define ------------------------------------------------------------*/ 00040 /* Private macro -------------------------------------------------------------*/ 00041 /* Private variables ---------------------------------------------------------*/ 00042 __IO uint8_t OscillatorStatus = 0x00; 00043 /* Private function prototypes -----------------------------------------------*/ 00044 static void CLK_Config(void); 00045 static void GPIO_Config(void); 00046 static void LCD_Config(void); 00047 /* Public functions ----------------------------------------------------------*/ 00048 00049 /** 00050 * @brief Example main entry point. 00051 * @param None 00052 * @retval None 00053 */ 00054 void main(void) 00055 { 00056 uint8_t state = 0x00; 00057 00058 /* GPIO Configuration -----------------------------------------------------*/ 00059 GPIO_Config(); 00060 00061 /* Configure LCD mounted on STM8-128 EVAL board ----------------------------*/ 00062 LCD_Config(); 00063 00064 /* Clock configuration -----------------------------------------------------*/ 00065 CLK_Config(); 00066 00067 enableInterrupts(); 00068 00069 while (1) 00070 { 00071 while(state == OscillatorStatus) 00072 {} 00073 state = OscillatorStatus; /* Update the selected master clock oscillator */ 00074 00075 /* joystick right */ 00076 if(OscillatorStatus == 0x00) 00077 { 00078 CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE); 00079 00080 /* Print on LCD line2*/ 00081 LCD_SetCursorPos(LCD_LINE2, 0); 00082 LCD_Print(" CLK = HSI "); 00083 } 00084 00085 /* joystick up */ 00086 if(OscillatorStatus == 0x01) 00087 { 00088 CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSE, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE); 00089 00090 /* Print on LCD line2*/ 00091 LCD_SetCursorPos(LCD_LINE2, 0); 00092 LCD_Print(" CLK = HSE "); 00093 } 00094 00095 /* joystick down */ 00096 if(OscillatorStatus == 0x02) 00097 { 00098 CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_LSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE); 00099 00100 /* Print on LCD line2*/ 00101 LCD_SetCursorPos(LCD_LINE2, 0); 00102 LCD_Print(" CLK = LSI "); 00103 } 00104 } 00105 } 00106 00107 /** 00108 * @brief Configure GPIO for buttons available on the evaluation board 00109 * @param None 00110 * @retval None 00111 */ 00112 static void GPIO_Config(void) 00113 { 00114 /* Configure GPIO used to drive the joystick 00115 JOYSTICK_UP --> PB6 00116 JOYSTICK_DOWN --> PB7 00117 JOYSTICK_RIGHT --> PB5 00118 */ 00119 STM_EVAL_PBInit(BUTTON_UP, BUTTON_MODE_EXTI); 00120 STM_EVAL_PBInit(BUTTON_DOWN, BUTTON_MODE_EXTI); 00121 STM_EVAL_PBInit(BUTTON_RIGHT, BUTTON_MODE_EXTI); 00122 } 00123 00124 /** 00125 * @brief Configure system clock to run at 16Mhz and output the system clock on 00126 * CCO pin 00127 * @param None 00128 * @retval None 00129 */ 00130 static void CLK_Config(void) 00131 { 00132 CLK_DeInit(); 00133 00134 /* Clock divider to HSI/1 */ 00135 CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); 00136 00137 /* Output Fcpu on CLK_CCO pin */ 00138 CLK_CCOConfig(CLK_OUTPUT_MASTER); 00139 } 00140 00141 /** 00142 * @brief Configure the LCD available on the evaluation board 00143 * @param None 00144 * @retval None 00145 */ 00146 static void LCD_Config(void) 00147 { 00148 /* Init the Eval board LCD */ 00149 STM8S_EVAL_LCD_Init(); 00150 00151 /* Clear LCD */ 00152 LCD_Clear(); 00153 00154 /* Print on LCD line1*/ 00155 LCD_SetCursorPos(LCD_LINE1, 0); 00156 LCD_Print("Clock Selection"); 00157 /* Print on LCD line2*/ 00158 LCD_SetCursorPos(LCD_LINE2, 0); 00159 LCD_Print(" Use joystick "); 00160 } 00161 00162 #ifdef USE_FULL_ASSERT 00163 00164 /** 00165 * @brief Reports the name of the source file and the source line number 00166 * where the assert_param error has occurred. 00167 * @param file: pointer to the source file name 00168 * @param line: assert_param error line source number 00169 * @retval None 00170 */ 00171 void assert_failed(uint8_t* file, uint32_t line) 00172 { 00173 /* User can add his own implementation to report the file name and line number, 00174 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00175 00176 /* Infinite loop */ 00177 while (1) 00178 { 00179 } 00180 } 00181 #endif 00182 00183 /** 00184 * @} 00185 */ 00186 00187 00188 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/