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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/TIM/TIM_7PWMOutputs/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file TIM/TIM_7PWMOutputs/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_7PWMOutputs 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, Channel4Pulse = 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 /* TIM 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 GPIO_InitTypeDef GPIO_InitStructure; 00084 00085 /* GPIOA, GPIOB and GPIOE Clocks enable */ 00086 RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE); 00087 00088 /* GPIOA Configuration: Channel 1, 2, 3, 4 and Channel 1N as alternate function push-pull */ 00089 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_7; 00090 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00091 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00092 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00093 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; 00094 GPIO_Init(GPIOA, &GPIO_InitStructure); 00095 00096 GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2); 00097 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2); 00098 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2); 00099 GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_2); 00100 GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2); 00101 00102 /* GPIOB Configuration: Channel 2N and 3N as alternate function push-pull */ 00103 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; 00104 GPIO_Init(GPIOB, &GPIO_InitStructure); 00105 00106 GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_2); 00107 GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_2); 00108 00109 /* TIM1 Configuration --------------------------------------------------- 00110 Generate 7 PWM signals with 4 different duty cycles: 00111 TIM1 input clock (TIM1CLK) is set to APB2 clock (PCLK2) 00112 => TIM1CLK = PCLK2 = SystemCoreClock 00113 TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock 00114 SystemCoreClock is set to 48 MHz for STM32F0xx devices 00115 00116 The objective is to generate 7 PWM signal at 17.57 KHz: 00117 - TIM1_Period = (SystemCoreClock / 17570) - 1 00118 The channel 1 and channel 1N duty cycle is set to 50% 00119 The channel 2 and channel 2N duty cycle is set to 37.5% 00120 The channel 3 and channel 3N duty cycle is set to 25% 00121 The channel 4 duty cycle is set to 12.5% 00122 The Timer pulse is calculated as follows: 00123 - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100 00124 00125 Note: 00126 SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.c file. 00127 Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate() 00128 function to update SystemCoreClock variable value. Otherwise, any configuration 00129 based on this variable will be incorrect. 00130 ----------------------------------------------------------------------- */ 00131 /* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */ 00132 TimerPeriod = (SystemCoreClock / 17570 ) - 1; 00133 /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */ 00134 Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10); 00135 /* Compute CCR2 value to generate a duty cycle at 37.5% for channel 2 and 2N */ 00136 Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000); 00137 /* Compute CCR3 value to generate a duty cycle at 25% for channel 3 and 3N */ 00138 Channel3Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100); 00139 /* Compute CCR4 value to generate a duty cycle at 12.5% for channel 4 */ 00140 Channel4Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod- 1)) / 1000); 00141 00142 /* TIM1 clock enable */ 00143 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE); 00144 00145 /* Time Base configuration */ 00146 TIM_TimeBaseStructure.TIM_Prescaler = 0; 00147 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 00148 TIM_TimeBaseStructure.TIM_Period = TimerPeriod; 00149 TIM_TimeBaseStructure.TIM_ClockDivision = 0; 00150 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 00151 00152 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 00153 00154 /* Channel 1, 2,3 and 4 Configuration in PWM mode */ 00155 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 00156 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 00157 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; 00158 TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; 00159 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; 00160 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; 00161 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; 00162 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; 00163 00164 TIM_OC1Init(TIM1, &TIM_OCInitStructure); 00165 00166 TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; 00167 TIM_OC2Init(TIM1, &TIM_OCInitStructure); 00168 00169 TIM_OCInitStructure.TIM_Pulse = Channel3Pulse; 00170 TIM_OC3Init(TIM1, &TIM_OCInitStructure); 00171 00172 TIM_OCInitStructure.TIM_Pulse = Channel4Pulse; 00173 TIM_OC4Init(TIM1, &TIM_OCInitStructure); 00174 00175 /* TIM1 counter enable */ 00176 TIM_Cmd(TIM1, ENABLE); 00177 00178 /* TIM1 Main Output Enable */ 00179 TIM_CtrlPWMOutputs(TIM1, ENABLE); 00180 } 00181 00182 #ifdef USE_FULL_ASSERT 00183 00184 /** 00185 * @brief Reports the name of the source file and the source line number 00186 * where the assert_param error has occurred. 00187 * @param file: pointer to the source file name 00188 * @param line: assert_param error line source number 00189 * @retval None 00190 */ 00191 void assert_failed(uint8_t* file, uint32_t line) 00192 { 00193 /* User can add his own implementation to report the file name and line number, 00194 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00195 00196 /* Infinite loop */ 00197 while (1) 00198 { 00199 } 00200 } 00201 #endif 00202 00203 /** 00204 * @} 00205 */ 00206 00207 /** 00208 * @} 00209 */ 00210 00211 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/