Application Example of the combination of stm32f103 adc1 and DMA

# DefineADC1_Chanel00 # defineADC1_Chanel11 # defineADC1_Chanel22 # defineADC1_Chanel33 # region // = the number of open AD channels ============================#defineadc _ ENB_NUM1 # define ADC_CYC_Cycles5 ready // set the adconversion rate uint16_t AD_Value [ADC_ENB_NUM]; // the region where the DMA data is stored # define ADC1_DR_Address (uint32_t) 0x4001244C) // base address of the ADC1 data register //******************************* * ***** // Function Name: ADC1_Config // function: adc1 Initialization Configuration // entry parameter: NONE // exit parameter: NONE // return value: none //************************************* **/void ADC1_Config (void) {ADC_InitTypeDef ADC_InitStructure; RCC_APB2PeriphClockCmd (RCC_APB2Periph_ADC1, ENABLE); // enable adc/* DMA1 channel1 configuration ready */RCC_ADCCLKConfig (RCC_PCLK2_Div6 ); // ADC clock Division: 72/6 = 12 M/* ADC1 configuration frequency */ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; // independent Conversion Mode: ADC_InitStructure.ADC_ScanConvMode = ENABLE; // ENABLE scan mode De = ENABLE; // ENABLE the Continuous Conversion Mode. Disable = ADC_ExternalTrigConv_None; // The ADC external switch. Disable the ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right status. // The alignment mode is 12-bit, right alignment mode ADC_InitStructure.ADC_NbrOfChannel = ADC_ENB_NUM; // Number of enable channels, one ADC_Init (ADC1, & ADC_InitStructure);/* ADC1 regular channel9 configuration * // ADC Channel group, the sampling sequence of the 9th channels is 1. The conversion time is ADC_RegularChannelConfig (ADC1, ADC_Channel_9, 1, ADC_CYC _ Cycles5); // ADC_RegularChannelConfig (ADC1, ADC_Channel_8, 2, ADC_SampleTime_55Cycles5); ADC_DMACmd (ADC1, ENABLE); // ADC command to ENABLE ADC_Cmd (ADC1, ENABLE ); // enable ADC1ADC_ResetCalibration (ADC1); // re-calibrate while (ADC_GetResetCalibrationStatus (ADC1); // wait for the re-calibration to complete ADC_StartCalibration (ADC1 ); // start calibration while (ADC_GetCalibrationStatus (ADC1); // wait for the calibration to complete ADC_SoftwareStartConvCmd (ADC1, ENABLE); // The ADC continuously updates the RAM zone through DMA. // ADC_TempSensorVrefintCmd (ENABLE );} //*************************************/ /function name: DMA_Config_ADC1 // function: DMA Initialization Configuration // entry parameter: NONE // exit parameter: NONE // return value: none //************************************* **/void DMA_Config_ADC1 (void) {DMA_InitTypeDef DMA_InitStructure; RCC_AHBPeriphClockCmd (enabled, ENABLE); // ENABLE the DMA clock DMA_DeInit (DMA1_Channel1); // ENABLE DMA1's first channel resume = ADC1_DR_Add Ress; // The peripheral base address of DMA = (uint32_t) & AD_Value [0]; // The memory storage base address is a private array DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; // The DMA conversion mode is SRC. After the peripherals move to the memory DMA_InitStructure.DMA_BufferSize = Num_Adc_Chanel; // The DMA cache size, N buffers = DMA_PeripheralInc_Disable; // After receiving the data, the device address cannot be moved back to DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // after the device address is disabled, the target memory address is moved back to DMA_Ini TStructure. DMA_PeripheralDataSize = bytes; // defines the peripheral data width as 16 bytes = DMA_MemoryDataSize_HalfWord; // the size of the DMA moving data. HalfWord is 16 bytes = DMA_Mode_Circular; // The conversion mode, loop cache mode. Strong = strong; // high DMA Priority Ratio = DMA_M2M_Disable; // disable DMA_Init (DMA1_Channel1, & DMA_InitStructure) in M2M mode;/* Enable DMA1 channel1 */DMA_Cmd (DMA1_Channel1, ENABLE);} // === adc gpio initialization ====== void ADC1_GPIOInit (void) {// ----------- PB samples // VR port PB1GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; // pin 1GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // 50 m clock speed GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; // input mode GPIO_Init (GPIOB, & GPIO_InitStructure );} // ===== instance application ========/// ADC1 initialization settings ADC1_GPIOInit (); ADC1_Config (); DMA_Config_ADC1 (); // dma settings // -- main program ----- void mian (void) {while (1) {while (! F_10MS); F_10MS = 0; Tmp = AD_Value [0]; // read AD results in the cache }}