void pwm_init (void)
{
/* Time Base configuration */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 1199; // 24MHz clock, 24MHz/1200 = 20KHz
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Channel 1, 2,3 Configuration in PWM mode */
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = 0; // start with 0% duty cycle
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
/* configure ETR for current control */
TIM_ETRConfig (TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_ClearOC1Ref (TIM1, TIM_OCClear_Enable);
TIM_ClearOC2Ref (TIM1, TIM_OCClear_Enable);
TIM_ClearOC3Ref (TIM1, TIM_OCClear_Enable);
/* TIM1 counter enable */
TIM_Cmd (TIM1, ENABLE);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs (TIM1, ENABLE);
}
void ADC_config(void) {
DMA_InitTypeDef DMA_InitStructure_ADC;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitSt_C, GPIO_InitSt_D;
ADC_CommonInitTypeDef ADC_struct;
ADC_InitTypeDef ADC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//CONFIGURE DMA FOR ADC
DMA_InitStructure_ADC.DMA_Channel = DMA_Channel_0;
DMA_InitStructure_ADC.DMA_PeripheralBaseAddr = ADC_DR_ADDRESS;
DMA_InitStructure_ADC.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure_ADC.DMA_BufferSize = NUMBER_SAMPL_ADC;
DMA_InitStructure_ADC.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure_ADC.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure_ADC.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure_ADC.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure_ADC.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure_ADC.DMA_Priority = DMA_Priority_High;
DMA_InitStructure_ADC.DMA_FIFOMode = DMA_FIFOMode_Enable;
DMA_InitStructure_ADC.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure_ADC.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure_ADC);
//enable DMA interrupt
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
//CONFIGURE GPIO FOR ADC;
/*ADC Channel 10 -> PC0*/
GPIO_InitSt_C.GPIO_Pin = GPIO_Pin_0;
GPIO_InitSt_C.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitSt_C.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitSt_C);
//ADC COMMON INIT
ADC_struct.ADC_Mode = ADC_Mode_Independent ;
ADC_struct.ADC_Prescaler = ADC_Prescaler_Div8; //700kHz
ADC_struct.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
ADC_struct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_struct);
//ADC CHANNEL INIT
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_3Cycles);
ADC_DMARequestAfterLastTransferCmd(ADC1, DISABLE);
// ENABLE ADC1 DMA
ADC_DMACmd(ADC1, ENABLE);
// ENABLE ADC1
ADC_Cmd(ADC1, ENABLE);
/*configure TIM3*/
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
/* Input Trigger selection */
TIM_ETRConfig(TIM3, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);
TIM_SelectInputTrigger(TIM3, TIM_TS_ETRF);
/* Slave Mode selection: Trigger Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Trigger);
/*Trigger ADC -> PD2*/
GPIO_InitSt_D.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitSt_D.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitSt_D.GPIO_Pin = GPIO_Pin_2;
GPIO_Init(GPIOD, &GPIO_InitSt_D);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_TIM3);
}
