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EOC flag clears when entering ISR

ionutF
Associate III

‎2016-11-04 08:59 AM

Posted on November 04, 2016 at 16:59

When I start the ADC conversion the code jumps to ADC1_COMP_IRQHandler

In ADC isr the EOC flag clears after first assembly instruction of isr code. So when I check for EOC flag if is set...the flag is already zero.

A workaround would be to not check that flag and read the ADC anyway, if I have just the EOC event as IRQ source enabled. Is EOC flag clearing by hardware? How to prevent it?

I checked the code w/o

ADC_ContinuousModeCmd(ADC1,DISABLE);

ADC_OverrunModeCmd(ADC1,ENABLE);

ADC_WaitModeCmd(ADC1,ENABLE);

ADC_DiscModeCmd(ADC1,ENABLE);

ADC_AutoPowerOffCmd(ADC1,ENABLE);

Code:

#define D1_PORT GPIOA

#define D2_PORT GPIOB

#define D3_PORT GPIOB

#define D4_PORT GPIOB

#define DP_PORT GPIOB

#define D1_Pin GPIO_Pin_12

#define D2_Pin GPIO_Pin_4

#define D3_Pin GPIO_Pin_3

#define D4_Pin GPIO_Pin_12

#define SegB_Port GPIOA

#define SegD_Port GPIOA

#define SegE_Port GPIOA

#define SegC_Port GPIOB

#define SegG_Port GPIOB

#define SegA_Port GPIOF

#define SegF_Port GPIOF

#define SegA_Pin GPIO_Pin_6

#define SegB_Pin GPIO_Pin_15

#define SegC_Pin GPIO_Pin_14

#define SegD_Pin GPIO_Pin_8

#define SegE_Pin GPIO_Pin_11

#define SegF_Pin GPIO_Pin_7

#define SegG_Pin GPIO_Pin_13

#define DP_Pin GPIO_Pin_15

#define RelayPort GPIOB

#define K1Pin GPIO_Pin_2

#define K2Pin GPIO_Pin_10

#define SW1Pin GPIO_Pin_7

#define SW2Pin GPIO_Pin_6

#define SW3Pin GPIO_Pin_4

#define SWPort GPIOB

#define UserbtnPort GPIOA

#define UserbtnPin GPIO_Pin_0

int

main(

void

)

{

gpio_config();

adc_config();

ADC_StartOfConversion(ADC1);

while

(1)

{

}

}

void

ADC1_COMP_IRQHandler(

void

)

{

if

(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC)==SET)

{

DCVoltageValues[DCVoltageValuesIdx]=ADC_GetConversionValue(ADC1);

DCVoltageValuesIdx++;

}

ADC_ClearFlag(ADC1,ADC_FLAG_EOC|ADC_FLAG_ADRDY|ADC_FLAG_EOSMP|ADC_FLAG_EOSEQ|ADC_FLAG_OVR);

ADC_ClearITPendingBit(ADC1,ADC_IT_EOC);

ADC_ClearITPendingBit(ADC1,ADC_IT_EOSMP);

ADC_ClearITPendingBit(ADC1,ADC_IT_EOSEQ);

ADC_ClearITPendingBit(ADC1,ADC_IT_OVR);

ADC_ClearITPendingBit(ADC1,ADC_IT_AWD);

}

void

gpio_config(

void

)

{

GPIO_InitTypeDef GPIO_InitStructure;

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

GPIO_StructInit(&GPIO_InitStructure);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOF,ENABLE);

//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC,ENABLE);

/* Enable SYSCFG clock for EXTI controller */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;

//50MHz

GPIO_InitStructure.GPIO_Pin = D1_Pin|SegB_Pin|SegD_Pin|SegE_Pin;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = D2_Pin|D3_Pin|D4_Pin|SegC_Pin|SegG_Pin;

GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = SegA_Pin|SegF_Pin;

GPIO_Init(GPIOF, &GPIO_InitStructure);

//led 072

// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

// GPIO_Init(GPIOC, &GPIO_InitStructure);

//K1 , K2

GPIO_InitStructure.GPIO_Pin = K1Pin|K2Pin;

GPIO_Init(RelayPort, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin= SW1Pin|SW2Pin|SW3Pin;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;

//50MHz

GPIO_Init(SWPort, &GPIO_InitStructure);

//buton 072

// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//are pull up pe placa

// GPIO_InitStructure.GPIO_Pin= UserbtnPin;

// GPIO_Init(UserbtnPort, &GPIO_InitStructure);

/* Configure EXTI7 line */

EXTI_InitStructure.EXTI_Line = EXTI_Line7;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

/* Configure EXTI6 line */

EXTI_InitStructure.EXTI_Line = EXTI_Line6;

EXTI_Init(&EXTI_InitStructure);

/* Configure EXTI5 line */

EXTI_InitStructure.EXTI_Line = EXTI_Line5;

EXTI_Init(&EXTI_InitStructure);

// buton 072

//EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

//EXTI_InitStructure.EXTI_Line = EXTI_Line0;

//EXTI_Init(&EXTI_InitStructure);

/* Enable and set EXTI4..15 Interrupt to the lowest priority */

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

//NVIC_Init(&NVIC_InitStructure);

//buton 072

// NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;

// NVIC_InitStructure.NVIC_IRQChannelPriority = 0;

// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

// NVIC_Init(&NVIC_InitStructure);

}

void

adc_config(

void

)

{

ADC_InitTypeDef ADC_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

/* GPIOA Periph clock enable */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

//ADC Clock Source Selection : 6MHz

RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div2);

/* ADC1 Periph clock enable */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* Configure ADC Channel1 1..4 as analog input */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3 ;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* ADCs DeInit */

ADC_DeInit(ADC1);

/* Initialize ADC structure */

ADC_StructInit(&ADC_InitStructure);

/* Configure the ADC1 in continuous mode with a resolution equal to 12 bits */

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T3_TRGO;

//T3 trgo=update event

ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;

ADC_Init(ADC1, &ADC_InitStructure);

ADC_ChannelConfig(ADC1, ADC_Channel_1 , ADC_SampleTime_239_5Cycles);

/* ADC Calibration */

ADC_GetCalibrationFactor(ADC1);

/* Enable the ADC peripheral */

ADC_Cmd(ADC1, ENABLE);

/* Wait the ADRDY flag */

while

(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));

ADC_TempSensorCmd(ENABLE);

ADC_VrefintCmd(ENABLE);

ADC_VbatCmd(ENABLE);

ADC_ContinuousModeCmd(ADC1,DISABLE);

ADC_OverrunModeCmd(ADC1,ENABLE);

ADC_WaitModeCmd(ADC1,ENABLE);

ADC_DiscModeCmd(ADC1,ENABLE);

ADC_AutoPowerOffCmd(ADC1,ENABLE);

ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);

/* Enable the ADC gloabal Interrupt */

NVIC_InitStructure.NVIC_IRQChannel = ADC1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPriority = 5;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

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2 REPLIES 2
Tesla DeLorean
Guru

‎2016-11-04 11:53 AM

Posted on November 04, 2016 at 19:53

Is EOC flag clearing by hardware? 

Tell me you are not staring at a peripheral view in the debugger..

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..
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matic
Associate III

‎2016-11-04 02:20 PM

Posted on November 04, 2016 at 22:20

'' EOC is cleared by software writing 1 to it or by reading the ADCx_DR register ''

As Clive said, you might read DR register via debugger in watch window or with other register view window (depends on development tool). Read by debugger will clear EOC flag the same as read by CPU will.

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