The project is using MCU stm32f103C8T6 for controlling. Here we use the peripheral ADC for current sampling, and we need the time from the interrupt happening to the interrupt executing less than 2us. But the codes following spending about 6us. How can I reduce the time to 2us?
void ADC_Conf(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1);
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T4_CC4;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Left;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2,1,ADC_SampleTime_13Cycles5);
NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // AD中断优先级最高
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
ADC_ClearFlag(ADC1, ADC_FLAG_EOC);
ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);
ADC_ExternalTrigConvCmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
}
void ADC1_2_IRQHandler(void)
{
if (ADC1->SR & 0x02)
{
ADC1->SR = ~(uint32_t)0x02;
adc.adc_samples[0] = _IQ16toIQ(ADC_GetConversionValue(ADC1));
}
}
