Posted on February 22, 2014 at 13:39Hi All,
I have noticed that there are not much information in this forum regarding the subject.
(stm32f4):
0. Configure GPIO for ADC (PC0 - ADC channel 10)
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
1. Activate IRQ
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);
ADC_ITConfig(ADC1, ADC_IT_AWD, ENABLE);
2. Configure ADC
ADC_InitTypeDef ADC_init_structure;
ADC_init_structure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_init_structure.ADC_Resolution = ADC_Resolution_12b;
ADC_init_structure.ADC_ContinuousConvMode = ENABLE;
ADC_init_structure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_init_structure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_init_structure.ADC_NbrOfConversion = 1;
ADC_init_structure.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1, &ADC_init_structure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);
3. Configure AWD
ADC_AnalogWatchdogSingleChannelConfig(ADC1, ADC_Channel_10);
ADC_AnalogWatchdogThresholdsConfig(ADC1, 400, 0);
ADC_AnalogWatchdogCmd(ADC1, ADC_AnalogWatchdog_SingleRegEnable);
4. Activate ADC
ADC_Cmd(ADC1, ENABLE);
5. Set up IRQ function (everytime )
void ADC_IRQHandler(void)
{
if (ADC_GetITStatus(ADC1, ADC_IT_AWD))
{
ADC_ClearITPendingBit(ADC1, ADC_IT_AWD);
}
}
So every time the analog input pin gets a higher value than 400 the interrupt will fire.
Is the configuration/statement correct above?
Regards,
/rygelxvi
