/gnu_simple_examples/gnu_blink/bsp/STM32F2xx_StdPeriph_Lib_V1.1.0/Project/STM32F2xx_StdPeriph_Examples/TIM/OCToggle/main.c
C | 227 lines | 70 code | 37 blank | 120 comment | 2 complexity | 4f50559c2ede33f5975015e5f0eca6dc MD5 | raw file
- /**
- ******************************************************************************
- * @file TIM/OCToggle/main.c
- * @author MCD Application Team
- * @version V1.1.0
- * @date 13-April-2012
- * @brief Main program body
- ******************************************************************************
- * @attention
- *
- * <h2><center>© COPYRIGHT 2012 STMicroelectronics</center></h2>
- *
- * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
- * You may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.st.com/software_license_agreement_liberty_v2
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- ******************************************************************************
- */
-
- /* Includes ------------------------------------------------------------------*/
- #include "stm32f2xx.h"
-
- /** @addtogroup STM32F2xx_StdPeriph_Examples
- * @{
- */
-
- /** @addtogroup TIM_OCToggle
- * @{
- */
-
- /* Private typedef -----------------------------------------------------------*/
- /* Private define ------------------------------------------------------------*/
- /* Private macro -------------------------------------------------------------*/
- /* Private variables ---------------------------------------------------------*/
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
- __IO uint16_t CCR1_Val = 40961;
- __IO uint16_t CCR2_Val = 20480;
- __IO uint16_t CCR3_Val = 10240;
- __IO uint16_t CCR4_Val = 5120;
- uint16_t PrescalerValue = 0;
-
- /* Private function prototypes -----------------------------------------------*/
- void TIM_Config(void);
-
- /* Private functions ---------------------------------------------------------*/
-
- /**
- * @brief Main program
- * @param None
- * @retval None
- */
- int main(void)
- {
- /*!< At this stage the microcontroller clock setting is already configured,
- this is done through SystemInit() function which is called from startup
- file (startup_stm32f2xx.s) before to branch to application main.
- To reconfigure the default setting of SystemInit() function, refer to
- system_stm32f2xx.c file
- */
-
- /* TIM Configuration */
- TIM_Config();
-
- /* ---------------------------------------------------------------------------
- TIM3 Configuration: Output Compare Toggle Mode:
-
- In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1),
- since APB1 prescaler is different from 1.
- TIM3CLK = 2 * PCLK1
- PCLK1 = HCLK / 4
- => TIM3CLK = HCLK / 2 = SystemCoreClock /2
-
- To get TIM3 counter clock at 15 MHz, the prescaler is computed as follows:
- Prescaler = (TIM3CLK / TIM3 counter clock) - 1
- Prescaler = ((SystemCoreClock /2) /15 MHz) - 1
-
- CC1 update rate = TIM3 counter clock / CCR1_Val = 366.2 Hz
- ==> So the TIM3 Channel 1 generates a periodic signal with a
- frequency equal to 183.1 Hz.
-
- CC2 update rate = TIM3 counter clock / CCR2_Val = 732.4 Hz
- ==> So the TIM3 Channel 2 generates a periodic signal with a
- frequency equal to 366.3 Hz.
-
- CC3 update rate = TIM3 counter clock / CCR3_Val = 1464.8 Hz
- ==> So the TIM3 Channel 3 generates a periodic signal with a
- frequency equal to 732.4 Hz.
-
- CC4 update rate = TIM3 counter clock / CCR4_Val = 2929.6 Hz
- ==> So the TIM3 Channel 4 generates a periodic signal with a
- frequency equal to 1464.8 Hz.
-
- Note:
- SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f2xx.c file.
- Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
- function to update SystemCoreClock variable value. Otherwise, any configuration
- based on this variable will be incorrect.
- --------------------------------------------------------------------------- */
-
- /* Compute the prescaler value */
- PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 15000000) - 1;
-
- /* Time base configuration */
- TIM_TimeBaseStructure.TIM_Period = 65535;
- TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
-
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
-
- /* Output Compare Toggle Mode configuration: Channel1 */
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
- TIM_OC1Init(TIM3, &TIM_OCInitStructure);
-
- TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);
-
- /* Output Compare Toggle Mode configuration: Channel2 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
-
- TIM_OC2Init(TIM3, &TIM_OCInitStructure);
-
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);
-
- /* Output Compare Toggle Mode configuration: Channel3 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
-
- TIM_OC3Init(TIM3, &TIM_OCInitStructure);
-
- TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);
-
- /* Output Compare Toggle Mode configuration: Channel4 */
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
-
- TIM_OC4Init(TIM3, &TIM_OCInitStructure);
-
- TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable);
-
- /* TIM enable counter */
- TIM_Cmd(TIM3, ENABLE);
-
- /* TIM IT enable */
- TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
-
- while (1)
- {}
- }
-
- /**
- * @brief Configure the TIM3 Pins.
- * @param None
- * @retval None
- */
- void TIM_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- /* TIM3 clock enable */
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
-
- /* GPIOC clock enable */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
-
- /* GPIOC Configuration: TIM3 CH1 (PC6), TIM3 CH2 (PC7), TIM3 CH2 (PC8) and TIM3 CH4 (PC9) */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- /* Connect TIM Channels to AF2 */
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM3);
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_TIM3);
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_TIM3);
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_TIM3);
-
- /* Enable the TIM3 global Interrupt */
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
-
- #ifdef USE_FULL_ASSERT
-
- /**
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval None
- */
- void assert_failed(uint8_t* file, uint32_t line)
- {
- /* User can add his own implementation to report the file name and line number,
- ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
-
- while (1)
- {}
- }
- #endif
- /**
- * @}
- */
-
- /**
- * @}
- */
-
- /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/