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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/TIM/TIM_OCActive/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file TIM/TIM_OCActive/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_OCActive 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 /* Private macro -------------------------------------------------------------*/ 00042 /* Private variables ---------------------------------------------------------*/ 00043 uint16_t CCR1_Val = 1000; 00044 uint16_t CCR2_Val = 500; 00045 uint16_t CCR3_Val = 250; 00046 uint16_t CCR4_Val = 125; 00047 uint16_t PrescalerValue = 0; 00048 00049 /* Private function prototypes -----------------------------------------------*/ 00050 static void TIM_Config(void); 00051 00052 /* Private functions ---------------------------------------------------------*/ 00053 00054 /** 00055 * @brief Main program. 00056 * @param None 00057 * @retval None 00058 */ 00059 int main(void) 00060 { 00061 /*!< At this stage the microcontroller clock setting is already configured, 00062 this is done through SystemInit() function which is called from startup 00063 file (startup_stm32f0xx.s) before to branch to application main. 00064 To reconfigure the default setting of SystemInit() function, refer to 00065 system_stm32f0xx.c file 00066 */ 00067 00068 /* TIM Configuration */ 00069 TIM_Config(); 00070 00071 /* Turn on LED1 */ 00072 STM_EVAL_LEDOn(LED1); 00073 00074 /* Infinite loop */ 00075 while (1) 00076 { 00077 } 00078 } 00079 00080 /** 00081 * @brief Configure the TIM3 pins. 00082 * @param None 00083 * @retval None 00084 */ 00085 static void TIM_Config(void) 00086 { 00087 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 00088 TIM_OCInitTypeDef TIM_OCInitStructure; 00089 GPIO_InitTypeDef GPIO_InitStructure; 00090 00091 /* TIM3 clock enable */ 00092 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); 00093 00094 /* GPIOC clock enable */ 00095 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE); 00096 00097 /* GPIOA Configuration: TIM3 CH1 (PA6) and TIM3 CH2 (PA7) */ 00098 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; 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_UP; 00103 GPIO_Init(GPIOA, &GPIO_InitStructure); 00104 00105 /* GPIOB Configuration: TIM3 CH3 (PB0) and TIM3 CH4 (PB1) */ 00106 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; 00107 GPIO_Init(GPIOB, &GPIO_InitStructure); 00108 00109 /* Connect TIM Channels to AF2 */ 00110 GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1); 00111 GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1); 00112 GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_1); 00113 GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1); 00114 00115 /* Initialize Leds mounted on STM320518-EVAL board */ 00116 STM_EVAL_LEDInit(LED1); 00117 00118 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 00119 00120 TIM_OCStructInit(&TIM_OCInitStructure); 00121 00122 /* --------------------------------------------------------------------------- 00123 TIM3 Configuration: Output Compare Active Mode: 00124 In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1) 00125 TIM3CLK = PCLK1 00126 PCLK1 = HCLK 00127 => TIM3CLK = HCLK = SystemCoreClock 00128 00129 To get TIM3 counter clock at 1 KHz, the prescaler is computed as follows: 00130 Prescaler = (TIM3CLK / TIM3 counter clock) - 1 00131 Prescaler = (SystemCoreClock /1 KHz) - 1 00132 00133 Generate 4 signals with 4 different delays: 00134 TIM3_CH1 delay = CCR1_Val/TIM3 counter clock = 1000 ms 00135 TIM3_CH2 delay = CCR2_Val/TIM3 counter clock = 500 ms 00136 TIM3_CH3 delay = CCR3_Val/TIM3 counter clock = 250 ms 00137 TIM3_CH4 delay = CCR4_Val/TIM3 counter clock = 125 ms 00138 00139 Note: 00140 SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.c file. 00141 Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate() 00142 function to update SystemCoreClock variable value. Otherwise, any configuration 00143 based on this variable will be incorrect. 00144 00145 --------------------------------------------------------------------------- */ 00146 00147 /*Compute the prescaler value */ 00148 PrescalerValue = (uint16_t) (SystemCoreClock / 1000) - 1; 00149 00150 /* Time base configuration */ 00151 TIM_TimeBaseStructure.TIM_Period = 65535; 00152 TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; 00153 TIM_TimeBaseStructure.TIM_ClockDivision = 0; 00154 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 00155 00156 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 00157 00158 /* Output Compare Active Mode configuration: Channel1 */ 00159 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Active; 00160 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 00161 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 00162 TIM_OCInitStructure.TIM_Pulse = CCR1_Val; 00163 TIM_OC1Init(TIM3, &TIM_OCInitStructure); 00164 00165 TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable); 00166 TIM_ARRPreloadConfig(TIM3, DISABLE); 00167 /* Output Compare Active Mode configuration: Channel2 */ 00168 TIM_OCInitStructure.TIM_Pulse = CCR2_Val; 00169 TIM_OC2Init(TIM3, &TIM_OCInitStructure); 00170 00171 TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable); 00172 00173 /* Output Compare Active Mode configuration: Channel3 */ 00174 TIM_OCInitStructure.TIM_Pulse = CCR3_Val; 00175 TIM_OC3Init(TIM3, &TIM_OCInitStructure); 00176 00177 TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable); 00178 00179 /* Output Compare Active Mode configuration: Channel4 */ 00180 TIM_OCInitStructure.TIM_Pulse = CCR4_Val; 00181 TIM_OC4Init(TIM3, &TIM_OCInitStructure); 00182 00183 TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable); 00184 00185 /* TIM3 enable counter */ 00186 TIM_Cmd(TIM3, ENABLE); 00187 00188 TIM_GenerateEvent(TIM3, TIM_EventSource_Update); 00189 } 00190 00191 #ifdef USE_FULL_ASSERT 00192 00193 /** 00194 * @brief Reports the name of the source file and the source line number 00195 * where the assert_param error has occurred. 00196 * @param file: pointer to the source file name 00197 * @param line: assert_param error line source number 00198 * @retval None 00199 */ 00200 void assert_failed(uint8_t* file, uint32_t line) 00201 { 00202 /* User can add his own implementation to report the file name and line number, 00203 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00204 00205 /* Infinite loop */ 00206 while (1) 00207 { 00208 } 00209 } 00210 #endif 00211 00212 /** 00213 * @} 00214 */ 00215 00216 /** 00217 * @} 00218 */ 00219 00220 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/