Posted on May 31, 2017 at 17:02Hello,
I'm still trying to continue the programmation of my STM32F405 board and I have (again) a little problem. I use a OP-AMP to compare 2 signals by sending him a integer. The return value is always the same even if I change the initial integer and I dont understand why...
I hope this is understandable.
Can you explain me what's wrong in my code or eventually show me some documentation ?
void gpio_initialize()
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_initStruct_PA_an2;
GPIO_initStruct_PA_an2.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_initStruct_PA_an2.GPIO_Mode = GPIO_Mode_AN;
GPIO_initStruct_PA_an2.GPIO_OType = GPIO_OType_PP;
GPIO_initStruct_PA_an2.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_initStruct_PA_an2.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_initStruct_PA_an2);
}
void dac_initialize()
{
DAC_InitTypeDef DAC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;// DAC_WaveGeneration_Triangle;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
//DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_Cmd(DAC_Channel_2, ENABLE);
DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE);
DAC_SoftwareTriggerCmd(DAC_Channel_2, ENABLE);
}
void adc_initialize()
{
ADC_InitTypeDef ADC_init_struct12b;
//Clock configuration
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//ADC structure configuration
ADC_DeInit();
ADC_init_struct12b.ADC_DataAlign = ADC_DataAlign_Right;
ADC_init_struct12b.ADC_Resolution = ADC_Resolution_12b;
ADC_init_struct12b.ADC_ContinuousConvMode = ENABLE;
ADC_init_struct12b.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_init_struct12b.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_init_struct12b.ADC_NbrOfConversion = 1;
ADC_init_struct12b.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1, &ADC_init_struct12b);//Initialize ADC with the previous configuration
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_3Cycles);
ADC_Cmd(ADC1, ENABLE);
}
int adc_convert_sence()
{
ADC_SoftwareStartConv(ADC1);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
return ADC_GetConversionValue(ADC1);
}
int main(void)
{
gpio_initialize();
adc_initialize();
dac_initialize();
systickInit(1000);
DAC_SetChannel2Data(DAC_Align_12b_R, 2048);
while (1)
{
DAC_SetChannel1Data(DAC_Align_12b_R, 0);
delay_ms(20);
resultSence = adc_convert_sence();
printf('%d / ', resultSence);
DAC_SetChannel1Data(DAC_Align_12b_R, 10);
delay_ms(20);
resultSence = adc_convert_sence();
printf('%d / ', resultSence);
DAC_SetChannel1Data(DAC_Align_12b_R, 500);
delay_ms(20);
resultSence = adc_convert_sence();
printf('%d / ', resultSence);
}
}
Thanking you in advance,
Nicolas-
