Question
how to set samping rate of adc using stm32f4 as 1000 samples/seconds
Posted on July 30, 2013 at 09:36
Hello I want to set sampling rate 1000 samples/seconds.I am using ADC with FreeRTOS following are ADC.C and main.c files.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ADC.c #include ''stm32f4xx.h'' #include ''FreeRTOS.h'' #include ''task.h'' #include <math.h> #include <stdio.h> #include <stdlib.h> adcInit(){ ADC_InitTypeDef ADC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; //Enable ADC1 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //Enable the ADC1 GPIO Clock RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //Initializing GPIO for ADC GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //Initializing GPIO GPIO_Init(GPIOC, &GPIO_InitStructure); //ADC Common Init //Use Independent mode ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; ADC_CommonInit(&ADC_CommonInitStructure); //ADC1 Init ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = 1; ADC_Init(ADC1, &ADC_InitStructure); //Enabling Temperature sensor ADC_TempSensorVrefintCmd(ENABLE); //ADC1 regular channel16 configuration ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_3Cycles); //Enable ADC1 ADC_Cmd(ADC1, ENABLE); NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } main.c.......................>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> #include ''stm32f4xx.h'' #include ''FreeRTOS.h'' #include ''task.h'' #include <math.h> #include <stdio.h> #include <stdlib.h> #define MAX_COUNT 3 float adcValue[10000]; float adcVoltage[10000]; uint32_t count=0; uint32_t ADCx = ADC1; uint32_t USARTx = USART1; /*uint32_t USART_BaudRate = 9600; //uint32_t ADC_Resolution_Xb = ADC_Resolution12b; uint32_t ADC_SampleTime_XCycles = ADC_SampleTime_3Cycles ; uint32_t ADC_Channel_X = ADC_Channel_1 ; */ static void AdcTask(void *pvParameters){ ADC_SoftwareStartConv(ADCx); ADC_ITConfig(ADCx,ADC_IT_EOC,ENABLE); while(1){ ADC_GetFlagStatus(ADCx,ADC_FLAG_EOC); //Wait Until Transmit Finishes while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET); USART_SendData(USARTx,adcVoltage); } } initx(){ adcInit(); usartInit(); } void ADC_IRQHandler(void){ adcValue[count++] = (float)ADC_GetConversionValue(ADCx); } int main(void){ initx(); xTaskCreate(AdcTask, (signed char*)''AdcTask'', 128, NULL, tskIDLE_PRIORITY+1, NULL); vTaskStartScheduler(); return 0; }