126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
//Mostly from: http://www.pezzino.ch/stm32-adc-voltage-monitor/
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//Also: http://www.micromouseonline.com/2009/05/26/simple-adc-use-on-the-stm32/
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#include "adc.h"
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#include <stm32f30x_rcc.h>
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#include <stm32f30x_gpio.h>
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#include <stm32f30x_adc.h>
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#include <stm32f30x_tim.h>
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#include <stm32f30x_misc.h>
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static int calibration_value;
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extern RCC_ClocksTypeDef RCC_Clocks;
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void InitADC()
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{
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ADC_InitTypeDef ADC_InitStructure;
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ADC_CommonInitTypeDef ADC_CommonInitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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/* Configure the ADC clock */
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RCC_ADCCLKConfig( RCC_ADC34PLLCLK_Div2 );
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/* Enable ADC1 clock */
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RCC_AHBPeriphClockCmd( RCC_AHBPeriph_ADC34, ENABLE );
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/* ADC Channel configuration */
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/* GPIOC Periph clock enable */
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RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE );
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/* Configure ADC Channel7 as analog input */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
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GPIO_Init( GPIOB, &GPIO_InitStructure );
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ADC_StructInit( &ADC_InitStructure );
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/* Calibration procedure */
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ADC_VoltageRegulatorCmd( ADC4, ENABLE );
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/* Insert delay equal to 10 µs */
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_delay_us( 10 );
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ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
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ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;
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ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
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ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;
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ADC_CommonInit( ADC4, &ADC_CommonInitStructure );
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ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Enable;
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ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;
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ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;
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ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;
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ADC_InitStructure.ADC_NbrOfRegChannel = 1;
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ADC_Init( ADC4, &ADC_InitStructure );
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/* ADC4 regular channel3 configuration */
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ADC_RegularChannelConfig( ADC4, ADC_Channel_3, 1, ADC_SampleTime_181Cycles5 );
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/* Enable ADC4 */
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ADC_Cmd( ADC4, ENABLE );
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/* wait for ADRDY */
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while( !ADC_GetFlagStatus( ADC4, ADC_FLAG_RDY ) );
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NVIC_InitTypeDef NVIC_InitStructure;
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/* Enable the TIM2 gloabal Interrupt */
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NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init (&NVIC_InitStructure);
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/* TIM2 clock enable */
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RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM2, ENABLE);
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/* Time base configuration */
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RCC->CFGR |= 0X1400;
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TIM_TimeBaseStructure.TIM_Period = (RCC_Clocks.HCLK_Frequency/(ADCFS*ADCOVERSAMP)) - 1;
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TIM_TimeBaseStructure.TIM_Prescaler = 1 - 1; // Operate at clock frequency
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit (TIM2, &TIM_TimeBaseStructure);
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/* TIM IT enable */
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TIM_ITConfig (TIM2, TIM_IT_Update, ENABLE);
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/* TIM2 enable counter */
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TIM_Cmd (TIM2, ENABLE);
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/* Start ADC4 Software Conversion */
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ADC_StartConversion( ADC4 );
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}
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void TIM2_IRQHandler (void)
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{
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static uint8_t oversamp = 0;
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static int32_t average = 0;
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static int32_t oversampout = 0;
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if (TIM_GetITStatus (TIM2, TIM_IT_Update) != RESET) {
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TIM_ClearITPendingBit (TIM2, TIM_IT_Update);
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int16_t value = ADC_GetConversionValue(ADC4);
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ADC_StartConversion( ADC4 );
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oversampout += value;
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oversamp++;
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if( oversamp >= ADCOVERSAMP )
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{
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value = oversampout / ADCOVERSAMP;
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average = ((average*1023) + (value*1024))/1024;
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value = value-(average/1024);
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oversamp = 0;
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ADCCallback( value );
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oversampout = 0;
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}
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}
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}
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