STM32F103 TIM1 output PWM settings

// TIM1 frequency division # defineTIM1_DIV1 (1-1) # defineTIM1_DIV2 (2-1) # defineTIM1_DIV4 (4-1) # defineTIM1_DIV8 (8-1) # defineTIM1_DIV9 (9-1) # defineTIM1_DIV18 (18-1) # defineTIM1_DIV72 (72-1) # defineTIM1PinA_Enb TIM1-> CCER | = 0X0001 // compare Channel 1 output to IO # defineTIM1PinB_Enb TIM1-> CCER | = 0X0010 // compare Channel 2 output to IO # defineTIM1PinC_Enb TIM1-> CCER | = 0X0100 // compare Channel 3 output to IO # defineTIM1PinA_Dis TIM1-> CCER & = ~ 0X0001 // compare Channel 1 to disable output to IO # defineTIM1PinB_Dis TIM1-> CCER & = ~ 0X0010 // compare Channel 2 disable output to IO # defineTIM1PinC_Dis TIM1-> CCER & = ~ 0X0100 // compare Channel 3 disable output to IO # defineVT_PWM1000 // PWM count maximum frequency 8 K // # defineVT_PWM500 // PWM count maximum frequency 16 K //**** * ******************************* // Function Name: timerepwmmode_init // function: TIM1 is initialized in the PWM mode and used as the Compare output. // entry parameter: Count count frequency // exit parameter: NONE // return value: no // This setting is suitable for driving three pairs of MOS in BLDC driver control //*********************** **************** void timid pwmmode_init (int16_t Tcon, uint16_t psc) {RCC_APB2PeriphClockCmd (RCC_APB2Periph_TIM1, ENABLE); TIM_DeInit (TI M1); // reset the timer TIM1-> ARR = Tcon; // The timer re-load value TIM1-> PSC = psc; // The time pre-division coefficient TIM1-> CR1 & = ~ (1 <4); // count TIM1-> CR1 |=( 1 <7 ); // enable automatic re-loading // clear update interrupt comparison 1234 interrupt mark TIM1-> SR & = ~ 0X001F; // Channel 1 2 3 is configured as PWM1 mode TIM1-> CCMR1 = 0X6868; // TIM1-> CCMR2 = 0X0068; // do not compare Channel 1 2 3 output to IO and Level 1 is valid TIM1-> CCER = 0X0000; // TIM1-> CCR1 = 0; TIM1-> CCR2 = 0; TIM1-> CCR3 = 0; TIM1-> CCR4 = 0; // update interruption comparison 1-4 TIM1-> DIER & = ~ 0X001F; // TIM1-> DIER | = 0X0002; // enable comparison 1 TIM1-> BDTR |=( 1 <15 ); // enable the primary output !!! // Clear the update event flag bit and initialize all registers TIM1-> EGR & = ~ 0X0001; TIM1-> CR1 | = 0X0001; // enable the clock }//********************************* * *** // Function Name: toPWM_Value // function: Set the PWM duty cycle // entry parameter: Count count Frequency/exit parameter: NONE // return value: none //************************************* **/void ToPWM_Value (uint16_t InValue) {TIM1-> CCR1 = InValue; TIM1-> CCR2 = InValue; TIM1-> CCR3 = InValue ;} //*************************************/ /function name: BLDC_RUN_ONESTEP // function: six-step motor direction // entry parameter: current step of motor operation // exit parameter: none //************************************* **/void BLDC_RUN_ONESTEP (uint32_t STEP) {switch (STEP) {case 1: // condition; TIM1PinC_Dis; condition; UdePinA_Off; UdePinC_Off; UdePinB_On; break; case 2: // condition; TIM1PinC_Dis; condition; UdePinA_Off; UdePinB_Off; break; case 3: // break; TIM1PinC_Dis; break; UdePinA_Off; UdePinB_Off; UdePinC_On; break; case 4: // break; TIM1PinC_Dis; break; UdePinB_Off; UdePinC_Off; off; break; case 5: // hour; TIM1PinB_Dis; hour; UdePinB_Off; UdePinC_Off; hour; break; case 6: // hour; TIM1PinB_Dis; hour; UdePinA_Off; UdePinC_Off; hour; break; default: break ;}// ---- instance application ------ // 72 M/(9) = 8 M pwm cycle = (1/8) * 1000 = 125U TIM1_PWMMode_Init (VT_PWM, TIM1_DIV9 ); // PWM frequency setting initialization frequency F = 8 K // ToPWM_Value (500); // set the PWM duty cycle of the three-phase driver 500/1000 = 50% // TIM1PinA_Enb; // PWM output to IO. At this time, the PWM signal output is displayed on IO.