Posted on July 30, 2013 at 09:36Hello I want to set sampling rate 1000 samples/seconds.I am using ADC with FreeRTOS following are ADC.C and main.c files.
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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;
}
