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hwlp for pwm.. my output not pulling down to ground

Question asked by chikane.deepak on Mar 8, 2014
Latest reply on Mar 8, 2014 by Clive One
/**VARIABLE DUTY CYCLE BY EXTERNAL REFERENCE**/
#include "stm32f0xx.h" 
#include "stm32f0_discovery.h"


#define LED_BLUE_GPIO     GPIOC
#define LED_BLUE_PIN     8
#define LED_YELLOW_PIN     9
//---------------------------------------------------------------------
unsigned char  flag_1s=0;
unsigned int Duty_cycle_boost=0,Duty_cycle_buck=0;
//---------------------------------------------------------------------
/** @addtogroup STM32F0_Discovery_Peripheral_Examples
  * @{
  */


/** @addtogroup ADC_DMA
  * @{
  */


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address                0x40012440


/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t Boost_Ref_mv = 0, Buck_Ref_mv = 0, Boost_feedbak_output=0;
__IO uint16_t RegularConvData_Tab[3];


/* Private function prototypes -----------------------------------------------*/
void ADC1_CH_DMA_Config(void);


/* Private functions ---------------------------------------------------------*/


/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
     
/** @addtogroup STM32F0_Discovery_Peripheral_Examples
  * @{
  */


/** @addtogroup TIM_PWM_Output
  * @{
  */


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/


TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
uint16_t TimerPeriod = 0;
uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;


/* Private function prototypes -----------------------------------------------*/
void TIM_Config(void);


/* Private functions ---------------------------------------------------------*/


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_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */
  
  /* ADC1 channel with DMA configuration */
    ADC1_CH_DMA_Config();


          //RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;
          
          RCC->AHBENR |=RCC_AHBENR_GPIOCEN; // CONFIGURE CLOCK FOR PORT C
          
          RCC->APB1ENR |= RCC_APB1ENR_TIM3EN; //ENABLED CLOCK FOR TIMER 3


    RCC -> AHBENR |=(1<<19); // ENABLE CLOCK FOR PORT C
          
       GPIOC -> MODER |=(1<<18); //ENABLE PIN 9 OF PORT C
     
       GPIOC -> MODER |=(1<<16); //ENABLE PIN 8 OF PORT C
          
          //STM_EVAL_LEDInit(LED3); // LED 8 INITIALIZATION
    //STM_EVAL_LEDInit(LED4); // LED 9 INITILIZATION
     
TIM3->PSC = 23999;           // Set prescaler to 24 000 (PSC + 1)


TIM3->ARR = 2000;            // Auto reload value 1000 (FOR 1 SECOND DELAY)


TIM3->DIER = TIM_DIER_UIE; // Enable update interrupt (timer level)


TIM3->CR1 = TIM_CR1_CEN;// Enable timer


NVIC_EnableIRQ(TIM3_IRQn); // Enable interrupt from TIM3 (NVIC level)


 /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */


  /* TIM Configuration */
  TIM_Config();
  
  /* TIM1 Configuration ---------------------------------------------------
   Generate PWM signals with 4 different duty cycles:
   TIM1 input clock (TIM1CLK) is set to APB2 clock (PCLK2)    
    => TIM1CLK = PCLK2 = SystemCoreClock
   TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
   SystemCoreClock is set to 48 MHz for STM32F0xx devices
   
   The objective is to generate 4 PWM signal at 17.57 KHz:
     - TIM1_Period = (SystemCoreClock / 17570) - 1
   The channel 1 and channel 1N duty cycle is set to 50%
   The channel 2 and channel 2N duty cycle is set to 37.5%
   The channel 3 and channel 3N duty cycle is set to 25%
   The channel 4 duty cycle is set to 12.5%
   The Timer pulse is calculated as follows:
     - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
   
   Note: 
    SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.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 value to be set in ARR regiter to generate signal frequency at 17.57 Khz */
 // TimerPeriod = (SystemCoreClock / 17570 ) - 1; 
 
  TimerPeriod = (SystemCoreClock / 99000 ) - 1; // TO SET THE FREQUENCY
  /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */
  //Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
//     Channel1Pulse = (uint16_t) (((uint32_t) Duty_cycle * (TimerPeriod - 1)) / 100);


  /* TIM1 clock enable */
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
     
     //RCC->APB1ENR |= RCC_APB1ENR_TIM3EN; //ENABLED CLOCK FOR TIMER 3
  
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;


  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);


  /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;




while (1) 
{     
/**WHEN CONTROLLER ENDS UP WITH THE CONTING DEFINED ABOVE VALUE IE;1000 (FOR 1SECONDS) THEN IT FLAGS TO 1 WHICH WILL CALLED 
    THE INTERRUPT, AND IT IS GOIN INTO THE "void TIM3_IRQHandler(void) "TO COMPLETE THE INTEREPT REQUEST **/
          
          if(     flag_1s)
          {
               flag_1s=0;
               
               //LED_BLUE_GPIO->ODR ^= (1 << 8); // toggle LED state
                    
               //LED_BLUE_GPIO->ODR ^= (1 << 9); // toggle led state
               
               /* Test DMA1 TC flag */
    while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET ); 
    
    /* Clear DMA TC flag */
    DMA_ClearFlag(DMA1_FLAG_TC1);
    
    /* Convert temperature sensor voltage value in mv (CONVERT BOOST volt REF IN mv)*/
          
    Boost_Ref_mv = (uint32_t)((RegularConvData_Tab[0]* 3000) / 0xFFF);
    
    /*Convert Vref voltage value in mv * ADC CHANNEL 1 /*/
    Boost_feedbak_output  = (uint32_t)((RegularConvData_Tab[1]* 3000) / 0xFFF); // NOT USED NOW
          
       //Boost_feedbak_output = (uint32_t)((RegularConvData_Tab[2]* 3000) / 0xFFF); // for output feedback
          
          
          
          //     Duty_cycle=((90-10)* TempSensVoltmv/3000)+10;
          if (Boost_feedbak_output<1500)
          {
          if(Boost_Ref_mv>500)
          {
               Duty_cycle_boost=90-(80* Boost_Ref_mv/3000);
               
               //Duty_cycle_buck=90-(80* Buck_Ref_mv/3000);
               
               Channel1Pulse = (uint16_t) (((uint32_t) Duty_cycle_boost * (TimerPeriod - 1)) / 100);// realise the duty cycle FOR PIN PA8
               
               //Channel2Pulse = (uint16_t) (((uint32_t) Duty_cycle_buck * (TimerPeriod - 1)) / 100);// realise the duty cycle FOR PIN PA9
               
               //LED_BLUE_GPIO->ODR ^= (1 << 8); // toggle LED state
               
               // CONFIGURE CHANNEL 1 & CHANNEL 2
               
               TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
               TIM_OC1Init(TIM1, &TIM_OCInitStructure);
               
               TIM_OCInitStructure.TIM_Pulse =0;
               TIM_OC2Init(TIM1, &TIM_OCInitStructure);
               
               
               LED_BLUE_GPIO->ODR |= (1 << 8);// blue led on
               
               //TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
               //TIM_OC2Init(TIM1, &TIM_OCInitStructure);
          }
          else 
               {
                    TIM_OCInitStructure.TIM_Pulse = 0;
               TIM_OC1Init(TIM1, &TIM_OCInitStructure);
               LED_BLUE_GPIO->BRR |= (1 << 8);// blue led on
          }
     }
          else 
               {
                    TIM_OCInitStructure.TIM_Pulse = 0;
               TIM_OC1Init(TIM1, &TIM_OCInitStructure);
               LED_BLUE_GPIO->BRR |= (1 << 8);// blue led on
          }
          
/*     else if (Buck_Ref_mv>500)
          {
               Duty_cycle_buck=90-(80* Buck_Ref_mv/3000);
               
               Channel2Pulse = (uint16_t) (((uint32_t) Duty_cycle_buck * (TimerPeriod - 1)) / 100);// realise the duty cycle FOR PIN PA9
               TIM_OCInitStructure.TIM_Pulse = 0;
               TIM_OC1Init(TIM1, &TIM_OCInitStructure);
               
               TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
               TIM_OC2Init(TIM1, &TIM_OCInitStructure);
               
               LED_BLUE_GPIO->ODR |= (1 << 9);// yellow led on
               
               
          }*/
               /*
               if(TempSensVoltmv>=0xbb5)
               {
                    LED_BLUE_GPIO->ODR ^= (1 << 8); // toggle LED state
                    LED_BLUE_GPIO->BRR|=(1<<9);
               
               }
               else if(TempSensVoltmv==0)
               {
                    LED_BLUE_GPIO->ODR ^= (1 << 9); // toggle led state
                    LED_BLUE_GPIO->BRR|=(1<<8);
                    TIM_OCInitStructure.TIM_Pulse = 1;
               TIM_OC1Init(TIM1, &TIM_OCInitStructure);
                    
               }*/
               
               //LED_BLUE_GPIO->ODR ^= (1 << 8); // toggle LED state
               //TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
               //TIM_OC1Init(TIM1, &TIM_OCInitStructure);
          
               
  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);


  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
  }
}
}
void ADC1_CH_DMA_Config(void)
{
  ADC_InitTypeDef     ADC_InitStructure;
  DMA_InitTypeDef     DMA_InitStructure;
  
  /* ADC1 DeInit */  
  ADC_DeInit(ADC1);
  
  /* ADC1 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  
  /* DMA1 clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);
  
  /* DMA1 Channel1 Config */
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 2;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);
  
  /* DMA1 Channel1 enable */
  DMA_Cmd(DMA1_Channel1, ENABLE);
  
  /* ADC DMA request in circular mode */
  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
  
  /* Enable ADC_DMA */
  ADC_DMACmd(ADC1, ENABLE);  
  
  /* Initialize ADC structure */
  ADC_StructInit(&ADC_InitStructure);
  
  /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; 
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;
  ADC_Init(ADC1, &ADC_InitStructure); 
 
  /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */ 
  //ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);  
     


  
  /* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */ 
  //ADC_ChannelConfig(ADC1, ADC_Channel_Vrefint , ADC_SampleTime_55_5Cycles); 
     
     ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles); // CONFIGURED PA1 AS A ADC CHANNEL 1 for boost
   //ADC_VrefintCmd(ENABLE);
 
      ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_55_5Cycles);// CONFIGURED PA2 AS A ADC CHANNEL 2 for buck
 // ADC_TempSensorCmd(ENABLE);
  
     //ADC_ChannelConfig(ADC1, ADC_Channel_2, ADC_SampleTime_55_5Cycles); //Configured for boost feedback from output
     
  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);
  
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);     
  
  /* Wait the ADCEN falg */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 
  
  /* ADC1 regular Software Start Conv */ 
  ADC_StartOfConversion(ADC1);
}


#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
void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;


  /* GPIOA Clocks enable */
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
  
  /* GPIOA Configuration: Channel 1, 2, 3 and 4 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
     //GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
     //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
 // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
     GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN ;
     
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_2);


}
#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


void TIM3_IRQHandler(void) // INTERRUPT SERVICE ROUTINE CALL FROM WHILE
{
         TIM3->SR &= ~TIM_SR_UIF; // clear UIF=Update Interrupt Flag
                    
               flag_1s=1; // IT SETS THE FLAG=1, SO IT WILL ENTER IN WHILE LOOP AS IF LOOP PASS IN THE MAIN FUNCTION
     }

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