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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/TIM/TIM_ComplementarySignals/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file TIM/TIM_ComplementarySignals/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 TIM_ComplementarySignals 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 /* Private macro -------------------------------------------------------------*/ 00042 /* Private variables ---------------------------------------------------------*/ 00043 uint16_t TimerPeriod = 0; 00044 uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0; 00045 00046 /* Private function prototypes -----------------------------------------------*/ 00047 static void TIM_Config(void); 00048 00049 /* Private functions ---------------------------------------------------------*/ 00050 00051 /** 00052 * @brief Main program. 00053 * @param None 00054 * @retval None 00055 */ 00056 int main(void) 00057 { 00058 /*!< At this stage the microcontroller clock setting is already configured, 00059 this is done through SystemInit() function which is called from startup 00060 file (startup_stm32f0xx.s) before to branch to application main. 00061 To reconfigure the default setting of SystemInit() function, refer to 00062 system_stm32f0xx.c file 00063 */ 00064 00065 /* TIM1 Configuration */ 00066 TIM_Config(); 00067 00068 /* Infinite loop */ 00069 while (1) 00070 { 00071 } 00072 } 00073 00074 /** 00075 * @brief Configure the TIM1 Pins. 00076 * @param None 00077 * @retval None 00078 */ 00079 static void TIM_Config(void) 00080 { 00081 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 00082 TIM_OCInitTypeDef TIM_OCInitStructure; 00083 TIM_BDTRInitTypeDef TIM_BDTRInitStructure; 00084 GPIO_InitTypeDef GPIO_InitStructure; 00085 00086 /* GPIOA and GPIOB clocks enable */ 00087 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE); 00088 00089 /* TIM1 clock enable */ 00090 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); 00091 00092 /* GPIOA Configuration: 00093 - TIM1_CH1 pin (PA.08) 00094 - TIM1_CH1N pin (PA.07) 00095 - TIM1_CH2 pin (PA.09) 00096 - TIM1_CH3 pin (PA.10) 00097 */ 00098 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10; 00099 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00100 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00101 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00102 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00103 GPIO_Init(GPIOA, &GPIO_InitStructure); 00104 00105 00106 /* GPIOB Configuration: 00107 - TIM1_CH2N pin (PB.00) 00108 - TIM1_CH3N pin (PB.01) 00109 - TIM1_BKIN pin (PB.12) 00110 */ 00111 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_12; 00112 GPIO_Init(GPIOB, &GPIO_InitStructure); 00113 00114 /* Connect TIM pins to AF2 */ 00115 GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2); 00116 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2); 00117 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2); 00118 GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_2); 00119 GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2); 00120 GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_2); 00121 GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_2); 00122 GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_2); 00123 00124 /* --------------------------------------------------------------------------- 00125 TIM1 Configuration: 00126 00127 1/ Generate 3 complementary PWM signals with 3 different duty cycles: 00128 00129 TIM1 input clock (TIM1CLK) is set to APB2 clock (PCLK2). 00130 TIM1CLK = PCLK2 00131 PCLK2 = HCLK 00132 => TIM1CLK = HCLK = SystemCoreClock 00133 00134 TIM1CLK is fixed to SystemCoreClock, the 00135 TIM1 Prescaler is equal to 0 so the 00136 TIM1 counter clock used is SystemCoreClock (48MHz). 00137 00138 The objective is to generate PWM signal at 17.57 KHz: 00139 - TIM1_Period = (SystemCoreClock / 17570) - 1 00140 00141 The Three Duty cycles are computed as the following description: 00142 00143 The channel 1 duty cycle is set to 50% so channel 1N is set to 50%. 00144 The channel 2 duty cycle is set to 25% so channel 2N is set to 75%. 00145 The channel 3 duty cycle is set to 12.5% so channel 3N is set to 87.5%. 00146 00147 The Timer pulse is calculated as follows: 00148 - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100 00149 00150 2/ Insert a dead time equal to (11/SystemCoreClock) ns 00151 00152 3/ Configure the break feature, active at High level, and using the automatic 00153 output enable feature 00154 00155 4/ Use the Locking parameters level1. 00156 00157 Note: 00158 SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.c file. 00159 Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate() 00160 function to update SystemCoreClock variable value. Otherwise, any configuration 00161 based on this variable will be incorrect. 00162 --------------------------------------------------------------------------- */ 00163 00164 /* Compute the value to be set in ARR register to generate signal frequency at 17.57 Khz */ 00165 TimerPeriod = (SystemCoreClock / 17570) - 1; 00166 00167 /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */ 00168 Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10); 00169 00170 /* Compute CCR2 value to generate a duty cycle at 25% for channel 2 */ 00171 Channel2Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100); 00172 00173 /* Compute CCR3 value to generate a duty cycle at 12.5% for channel 3 */ 00174 Channel3Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000); 00175 00176 /* Time Base configuration */ 00177 TIM_TimeBaseStructure.TIM_Prescaler = 0; 00178 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 00179 TIM_TimeBaseStructure.TIM_Period = TimerPeriod; 00180 TIM_TimeBaseStructure.TIM_ClockDivision = 0; 00181 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 00182 00183 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 00184 00185 /* Channel 1, 2 and 3 Configuration in PWM mode */ 00186 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 00187 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 00188 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; 00189 TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; 00190 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; 00191 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; 00192 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; 00193 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; 00194 00195 TIM_OC1Init(TIM1, &TIM_OCInitStructure); 00196 00197 TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; 00198 TIM_OC2Init(TIM1, &TIM_OCInitStructure); 00199 00200 TIM_OCInitStructure.TIM_Pulse = Channel3Pulse; 00201 TIM_OC3Init(TIM1, &TIM_OCInitStructure); 00202 00203 /* Automatic Output enable, Break, dead time and lock configuration*/ 00204 TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; 00205 TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; 00206 TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; 00207 TIM_BDTRInitStructure.TIM_DeadTime = 11; 00208 TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable; 00209 TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High; 00210 TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; 00211 00212 TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); 00213 00214 /* TIM1 counter enable */ 00215 TIM_Cmd(TIM1, ENABLE); 00216 00217 /* Main Output Enable */ 00218 TIM_CtrlPWMOutputs(TIM1, ENABLE); 00219 } 00220 00221 #ifdef USE_FULL_ASSERT 00222 00223 /** 00224 * @brief Reports the name of the source file and the source line number 00225 * where the assert_param error has occurred. 00226 * @param file: pointer to the source file name 00227 * @param line: assert_param error line source number 00228 * @retval None 00229 */ 00230 void assert_failed(uint8_t* file, uint32_t line) 00231 { 00232 /* User can add his own implementation to report the file name and line number, 00233 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00234 00235 /* Infinite loop */ 00236 while (1) 00237 { 00238 } 00239 } 00240 #endif 00241 00242 /** 00243 * @} 00244 */ 00245 00246 /** 00247 * @} 00248 */ 00249 00250 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/