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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/COMP/COMP_PWMSignalControl/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file COMP/COMP_PWMSignalControl/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>© 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 COMP_PWMSignalControl 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 /* Private macro -------------------------------------------------------------*/ 00042 /* Private variables ---------------------------------------------------------*/ 00043 /* Private function prototypes -----------------------------------------------*/ 00044 /* Private functions ---------------------------------------------------------*/ 00045 static void COMP_Config(void); 00046 static void TIM_Config(void); 00047 00048 /** 00049 * @brief Main program. 00050 * @param None 00051 * @retval None 00052 */ 00053 int main(void) 00054 { 00055 /*!< At this stage the microcontroller clock setting is already configured, 00056 this is done through SystemInit() function which is called from startup 00057 file (startup_stm32f0xx.s) before to branch to application main. 00058 To reconfigure the default setting of SystemInit() function, refer to 00059 system_stm32f0xx.c file 00060 */ 00061 00062 /* TIM2 channels Configuration in PWM mode */ 00063 TIM_Config(); 00064 00065 /* COMP2 Configuration */ 00066 COMP_Config(); 00067 00068 /* Infinite loop */ 00069 while (1) 00070 { 00071 } 00072 } 00073 00074 /** 00075 * @brief Configures TIM1: channels in PWM mode 00076 * @param None 00077 * @retval None 00078 */ 00079 static void TIM_Config(void) 00080 { 00081 00082 TIM_BDTRInitTypeDef TIM_BDTRInitStructure; 00083 TIM_OCInitTypeDef TIM_OCInitStructure; 00084 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 00085 GPIO_InitTypeDef GPIO_InitStructure; 00086 00087 /* GPIOA clock enable */ 00088 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 00089 00090 /* TIM1 channels pin configuration: 00091 TIM1_CH1 -> PA8 00092 */ 00093 GPIO_StructInit(&GPIO_InitStructure); 00094 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00095 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00096 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00097 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 00098 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; 00099 GPIO_Init(GPIOA, &GPIO_InitStructure); 00100 00101 /* Enable Alternate function on PA8 to be controlled by TIM1 */ 00102 GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2); 00103 00104 /* TIM1 clock enable */ 00105 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); 00106 00107 /* Time Base configuration */ 00108 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 00109 TIM_TimeBaseStructure.TIM_Prescaler = 0; 00110 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 00111 TIM_TimeBaseStructure.TIM_Period = 100; 00112 TIM_TimeBaseStructure.TIM_ClockDivision = 0; 00113 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 00114 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 00115 00116 /* Channel 1 Configuration in PWM mode */ 00117 TIM_OCStructInit(&TIM_OCInitStructure); 00118 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 00119 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 00120 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; 00121 TIM_OCInitStructure.TIM_Pulse = 50; 00122 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; 00123 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; 00124 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; 00125 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; 00126 TIM_OC1Init(TIM1, &TIM_OCInitStructure); 00127 00128 /* Automatic Output enable, Break, dead time and lock configuration*/ 00129 TIM_BDTRStructInit(&TIM_BDTRInitStructure); 00130 TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; 00131 TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; 00132 TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; 00133 TIM_BDTRInitStructure.TIM_DeadTime = 11; 00134 TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable; 00135 TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High; 00136 TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; 00137 TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); 00138 00139 /* Main Output Enable */ 00140 TIM_CtrlPWMOutputs(TIM1, ENABLE); 00141 00142 /* TIM1 counter enable */ 00143 TIM_Cmd(TIM1, ENABLE); 00144 } 00145 00146 /** 00147 * @brief Configures COMP2: PA3 as COMP2 non inverting input 00148 * VREFINT as COMP2 inverting input 00149 * and COMP2 output to TIM2 BKIN. 00150 * @param None 00151 * @retval None 00152 */ 00153 static void COMP_Config(void) 00154 { 00155 00156 COMP_InitTypeDef COMP_InitStructure; 00157 GPIO_InitTypeDef GPIO_InitStructure; 00158 /* GPIOA Peripheral clock enable */ 00159 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 00160 00161 /* Configure PA3 in analog mode: PA3 is connected to COMP2 non inverting input */ 00162 GPIO_StructInit(&GPIO_InitStructure); 00163 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; 00164 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; 00165 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00166 GPIO_Init(GPIOA, &GPIO_InitStructure); 00167 00168 /* COMP Peripheral clock enable */ 00169 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); 00170 00171 /* COMP2 config */ 00172 COMP_StructInit(&COMP_InitStructure); 00173 COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_VREFINT; 00174 COMP_InitStructure.COMP_Output = COMP_Output_TIM1BKIN; 00175 COMP_InitStructure.COMP_Hysteresis = COMP_Hysteresis_No; 00176 COMP_InitStructure.COMP_Mode = COMP_Mode_UltraLowPower; 00177 COMP_InitStructure.COMP_OutputPol = COMP_OutputPol_NonInverted; 00178 COMP_Init(COMP_Selection_COMP2, &COMP_InitStructure); 00179 00180 /* Enable COMP2 */ 00181 COMP_Cmd(COMP_Selection_COMP2, ENABLE); 00182 } 00183 00184 00185 #ifdef USE_FULL_ASSERT 00186 00187 /** 00188 * @brief Reports the name of the source file and the source line number 00189 * where the assert_param error has occurred. 00190 * @param file: pointer to the source file name 00191 * @param line: assert_param error line source number 00192 * @retval None 00193 */ 00194 void assert_failed(uint8_t* file, uint32_t line) 00195 { 00196 /* User can add his own implementation to report the file name and line number, 00197 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00198 00199 /* Infinite loop */ 00200 while (1) 00201 { 00202 } 00203 } 00204 #endif 00205 00206 /** 00207 * @} 00208 */ 00209 00210 /** 00211 * @} 00212 */ 00213 00214 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/