STM32 用AD模块控制生成可变占空比的PWM.doc

/* * * file TIM/7PWM_Output/main.c * author MCD Application Team * version V3.5.0 * date 08-April-2011 * brief Main program body * * attention * * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. * * © COPYRIGHT 2011 STMicroelectronics * */ /* Includes -*/#include stm32f10x.h#include math.h#define ADC1_DR_Address (uint32_t)0x4001244C)/* addtogroup STM32F10x_StdPeriph_Examples * */* addtogroup TIM_7PWM_Output * */ /* Private typedef -*/* Private define -*/* Private macro -*/* Private variables -*/ADC_InitTypeDef ADC_InitStructure;DMA_InitTypeDef DMA_InitStructure;_IO uint16_t ADCConvertedValue3;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 RCC_Configuration(void);void GPIO_Configuration(void);void DMA_Configuration(void);void TIM4_Configuration(void);void ADC1_Configuration(void);/* Private functions -*/* * brief Main program * param None * retval None */int main(void) /*!CCR1 = (uint16_t) (ADCConvertedValue1* (TimerPeriod - 1) / 4096);TIM4-CCR2 = (uint16_t) (ADCConvertedValue0* (TimerPeriod - 1) / 4096); /* * brief Configures the different system clocks. * param None * retval None */void RCC_Configuration(void) /* TIM1, GPIOA, GPIOB, GPIOE and AFIO clocks enable */ SystemInit(); RCC_ADCCLKConfig(RCC_PCLK2_Div2); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC , ENABLE); RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM4, ENABLE);/* * brief Configure the TIM 1 Pins. * param None * retval None */void GPIO_Configuration(void) GPIO_InitTypeDef GPIO_InitStructure; /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_0|GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(GPIOC, &GPIO_InitStructure);void DMA_Configuration(void)/* DMA1 channel1 configuration -*/ DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 3; 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); /* Enable DMA1 channel1 */ DMA_Cmd(DMA1_Channel1, ENABLE);void ADC1_Configuration(void) /* ADC1 configuration -*/ ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 3; ADC_Init(ADC1, &ADC_InitStructure); /* ADC1 regular channel14 configuration */ ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_239Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_239Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_239Cycles5); /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); /* Enable ADC1 reset calibration register */ ADC_ResetCalibration(ADC1); /* Check the end of ADC1 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC1); /* Start ADC1 calibration */ ADC_StartCalibration(ADC1); /* Check the end of ADC1 calibration */ while(ADC_GetCalibrationStatus(ADC1); /* Start ADC1 Software Conversion */ ADC_SoftwareStartConvCmd(ADC1, ENABLE); void TIM4_Configuration(void) /* TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density and Connectivity line devices and to 24 MHz for Low-Density Value line and Medium-Density Value line devices The Timer pulse is calculated as follows: - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100 - */ TimerPeriod = (SystemCoreClock / 4000 ) - 1; /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */ Channel1Pulse = (uint16_t) (uint32_t) 5 * (TimerPeriod - 1) / 10); /* Compute CCR2 value to generate a duty cycle at 37.5% for channel 2 and 2N */ Channel2Pulse = (uint16_t) (uint32_t) 375 * (TimerPeriod - 1) / 1000); /* Compute CCR3 value to generate a duty cycle at 25% for channel 3 and 3N */ Channel3Pulse = (uint16_t) (uint32_t) 25 * (TimerPeriod - 1) / 100); /* Compute CCR4 value to generate a duty cycle at 12.5% for channel 4 */ Channel4Pulse = (uint16_t) (uint32_t) 125 * (TimerPeriod- 1) / 1000); /* Time Base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = TimerPe