STM8S_StdPeriph_Examples/TIM1/TIM1_Sinewave_Generation/main.c

Go to the documentation of this file.

/**
  ******************************************************************************
  * @file    TIM1_Sinewave_Generation\main.c
  * @author  MCD Application Team
  * @version  V2.2.0
  * @date     30-September-2014
  * @brief   This file contains the main function for TIM1 Sinewave_Generation example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 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 "stm8s.h"
#include "main.h"

/**
  * @addtogroup TIM1_Sinewave_Generation
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO MySin_Typedef sin;/* Stores the sin structure in ram */
__IO uint8_t counter = 0;   /* The counter variable for counting the Update cycles in TIM1 */
/* This shows the value of the samples for the different no of samples in half
sine wave. The last value corresponds to the amplitude of the sine wave.*/

#if  nbr_of_samples_half == 16
CONST uint8_t sample[9]={0,20,38,56,71,83,92,98,100};

#elif  nbr_of_samples_half == 18
CONST uint8_t sample[10]={0,17,34,50,64,76,86,93,97,99};

#elif  nbr_of_samples_half == 22
CONST uint8_t sample[12]={0,14,28,42,54,65,76,84,91,96,99,100};

#elif  nbr_of_samples_half == 24
CONST uint8_t sample[13]={0,13,25,38,49,60,69,78,85,91,95,97,98};

#elif  nbr_of_samples_half == 26
CONST uint8_t sample[14]={0,12,24,35,46,56,66,74,81,88,93,96,98,99};

#elif  nbr_of_samples_half == 28
CONST uint8_t sample[15]={0,11,22,33,43,53,62,71,78,85,90,94,97,99,100};

#elif   nbr_of_samples_half == 30 
CONST uint8_t sample[16]={0,10,21,31,41,50,59,67,74,81,87,91,95,98,99,100};

#elif  nbr_of_samples_half == 46
CONST uint8_t sample[24]={0,7,13,20,26,33,39,45,51,57,62,67,72,76,80,84,87,90,92, \
                     94,96,97,98,98};
#endif

/* Private function prototypes -----------------------------------------------*/
static void LoadValueIntoSinStruct(void);
static void TIM1_Config(void);


/* Public functions ----------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */

void main(void)
{ 
  /* select Clock = 4 MHz */
  CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV4);
  CLK_HSICmd(ENABLE);
  
  
  /* The counter value is initialized to 0.*/
  counter = 0;
  LoadValueIntoSinStruct();           
  
  /* TIM1 configuration -----------------------------------------*/
  TIM1_Config();

  /* Enable interrupts*/
  enableInterrupts();        
  
  while(1)
  {}
}  

/**
  * @brief  Init Sin Struct
  * @param  None
  * @retval None
  */
static void LoadValueIntoSinStruct(void)
{
  uint8_t  offset=0,diff=0;
  
  while(offset <= (nbr_of_samples_half/2))
  {
    /*First half of upper half samples of sine wave is loaded into "value" of sin structure.*/
     sin.Value[offset] = sample[offset]; 
     offset++;                      
  }
  diff = (uint8_t)(offset - 1);
  while(offset < nbr_of_samples_half)
  {                                    
      diff--;  
      /* Second half of upper half samples of sine wave is loaded into "value" of sin structure.*/
      sin.Value[offset] = sample[diff];    
      offset++;                         
  }  
  /*Index is initialized to 0.Sin wave upper half is generated at start*/
  sin.Index = 0;                      
  sin.Up = TRUE;                      
}

/**
  * @brief  Configure TIM1 to allow sine wave generation
  * @param  None
  * @retval None
  */
static void TIM1_Config(void)
{
  TIM1_DeInit();
  /* Time base configuration */
  /*
       TIM1_Period = INIT_TIM1_ARR
          TIM1_Prescaler = 0
       TIM1_RepetitionCounter=0
      */
  TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, INIT_TIM1_ARR, 0);
  
  /* PWM configuration */
  /*
       TIM1_OCMode = TIM1_OCMODE_PWM1
       TIM1_OutputState = TIM1_OUTPUTSTATE_ENABLE
       TIM1_Pulse = INIT_TIM1_CCR1
       TIM1_OCPolarity = TIM1_OCPOLARITY_LOW
  */
  TIM1_OC1Init(TIM1_OCMODE_PWM1, TIM1_OUTPUTSTATE_ENABLE, TIM1_OUTPUTNSTATE_DISABLE,
               INIT_TIM1_CCR1, TIM1_OCPOLARITY_LOW, TIM1_OCNPOLARITY_LOW, 
               TIM1_OCIDLESTATE_RESET, TIM1_OCNIDLESTATE_RESET);
  
  /* Update Interrupt Enable */
  TIM1_ITConfig(TIM1_IT_UPDATE, ENABLE);
  
  /* ARRPreload Enable */
  TIM1_ARRPreloadConfig(ENABLE);
  
  /* Enable TIM1 */
  TIM1_Cmd(ENABLE);
  
  /* Enable CC1 output*/
  TIM1_CtrlPWMOutputs(ENABLE);
}


#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) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */


/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/