PWM OP MODE for STM32F103VBT6

[balu]

Posted on November 27, 2014 at 13:51

Hi,

           i am trying to generate an Signal with 50 % duty cycle using PWM Mode 1 Timer 1 channel 1.Pls go through the code below.I can't generate any pulse at PE9 PE9 is used as timer 1 channel 1 PWM OP. Using HSE 8Mhz with PLL=HSE*9; SYSCLK=72Mhz. void Configure_Controller(void) {     Reset_Clock_Control();     GPIO_Configuration();     Configure_Timer_1();      } void Reset_Clock_Control(void) {     ErrorStatus HSEStartUpStatus; //To handle Error Status of HSE     RCC_ClocksTypeDef RCC_Clocks_Attributes;     RCC_DeInit();      // Reset the RCC clock configuration to the default reset state HSI ON,HSE & PLL OFF     RCC_HSEConfig(RCC_HSE_ON); //Enable external clock 8Mhz     HSEStartUpStatus = RCC_WaitForHSEStartUp();//Wait till HSE is ready and if Time out is reached exit     if(HSEStartUpStatus==SUCCESS)          //if HSE is stable     {         Exception_Object.HSE_Clock_Exception=0;         FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//Enable Prefetch Buffer         FLASH_SetLatency(FLASH_Latency_2); //Flash 2 wait state         RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);// (HSE Clock*9)/1;         RCC_PLLCmd(ENABLE); //Enable PLL with 72MHz         while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);//Wait untill PLL is ready         RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Select the PLL as system clock Source         while(RCC_GetSYSCLKSource() != 0x08); //Wait untill PLL is used as system clock         RCC_HCLKConfig(RCC_SYSCLK_Div1); //use HCLK/AHB =system clock/1; 72Mhz         RCC_PCLK1Config(RCC_HCLK_Div2); //APB1 HCLk/2=36Mhz         RCC_PCLK2Config(RCC_HCLK_Div1);    //APB2 HCLk/1=72Mhz         RCC_LSEConfig(RCC_LSE_OFF); //Disable LSE         RCC_LSICmd(DISABLE); //Disable LSI         RCC_GetClocksFreq(&RCC_Clocks_Attributes);          //Get Present Clocks         if((RCC_Clocks_Attributes.SYSCLK_Frequency==72000000)&&(RCC_Clocks_Attributes.HCLK_Frequency==72000000)&&(RCC_Clocks_Attributes.PCLK1_Frequency==36000000)&&(RCC_Clocks_Attributes.PCLK2_Frequency==72000000))         Exception_Object.Clocks_Exception=0;         else         Exception_Object.Clocks_Exception=1;                         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_TIM1 | RCC_APB2Periph_AFIO, ENABLE); //Port E & Timer 1 & AFIO         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);     }     else     {         Exception_Object.HSE_Clock_Exception=1;         RCC_HSICmd(ENABLE);  //Enable     } } /************************************************************************************************************************************************************* ****** Routine name:GPIO_Configuration ****** Formal Argument:None ****** Retur Type:None ****** Used to Intializse the Port Pins         * PE^9: 10HZ Timer 1 Channel 1 with 50 % duty cycle **************************************************************************************************************************************************************/ void GPIO_Configuration(void) {     GPIO_InitTypeDef GPIO_Configuration_Object;     GPIO_DeInit(GPIOE);    //Reset the GPIO Port E to default value     GPIO_Configuration_Object.GPIO_Pin=GPIO_Pin_9;  //Used for Generating 10 HZ signal through PWM_TIM1_CH1     GPIO_Configuration_Object.GPIO_Speed=GPIO_Speed_2MHz;     GPIO_Configuration_Object.GPIO_Mode=GPIO_Mode_Out_PP;     GPIO_Init(GPIOE, &GPIO_Configuration_Object); //Initialise the PORt with required setting     GPIO_PinRemapConfig(GPIO_Remap_TIM1, ENABLE); // Configure peripheral I/O remapping } /************************************************************************************************************************************************************* ****** Routine name:Configure_Timer_1 ****** Formal Argument:None ****** Retur Type:None ****** Used to enable timer 1 channel 1 with 10 hz 50 % duty cycle **************************************************************************************************************************************************************/ void Configure_Timer_1(void) {     TIM_OCInitTypeDef TIM_OCInitStructure={0};     TIM_TimeBaseInitTypeDef Timer_Struct_Object={0};     TIM_DeInit(TIM1);      //Reset the Timer 1          Timer_Struct_Object.TIM_Period=50000;     Timer_Struct_Object.TIM_Prescaler=144;        Timer_Struct_Object.TIM_ClockDivision=TIM_CKD_DIV1;     Timer_Struct_Object.TIM_CounterMode=TIM_CounterMode_Up;     TIM_TimeBaseInit(TIM4, &Timer_Struct_Object);     TIM_Cmd(TIM1, ENABLE);     TIM_SelectOCxM(TIM4, TIM_Channel_1, TIM_OCMode_PWM1);     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;     TIM_OCInitStructure.TIM_Pulse = 250;     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;     TIM_OC1Init(TIM1, &TIM_OCInitStructure);     TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);          TIM_CtrlPWMOutputs(TIM1, ENABLE);                }

[Tesla DeLorean]

Posted on November 27, 2014 at 15:08

Bunch of TIM4 references still in there. TIM1 you'd also want to fully qualify all the OC structure fields, including the inverting output fields.