Posted on June 09, 2017 at 15:48Hello All,
I am working on a development board with the MCU STM32107VCT6. I am trying to store the values from two Analog sensors and use these values to do some task. However, I am facing a problem with the ADC coversion. Say, the value stored is 2.5V, but the controller is doing the task at a different voltage. You can review my code below. It would be a great help if any of you can guide me where have I gone wrong.
Thank You.
/* This is how I am storing the value. The sensor is connected to PA5*/
if
(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4) == TRUE)
{
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_41Cycles5);
ADC_Cmd(ADC1,
ENABLE);
ADC_ResetCalibration(ADC1);
while
(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while
(ADC_GetCalibrationStatus(ADC1) ==
SET);
ADC_SoftwareStartConvCmd(ADC1,
ENABLE);
while
(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)){}
value_Sensor1 = ADC_GetConversionValue(ADC1) * (3.3 / 4095); // value_Sensor1 is defined as static float
}
/*This is the code to detect the stored value. Until the stored value is detected, I want to keep the PD10 high*/
if
(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4) ==
Bit_SET) // detecting should start when I press PD4
{
temp = 0;
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_41Cycles5);
ADC_Cmd(ADC1,
ENABLE);
ADC_ResetCalibration(ADC1);
while
(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while
(ADC_GetCalibrationStatus(ADC1));
GPIO_WriteBit(GPIOD, GPIO_Pin_10,
Bit_SET);
do
{
ADC_SoftwareStartConvCmd(ADC1,
ENABLE);
while
(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)){}
temp = ADC_GetConversionValue(ADC1) * (3.3 / 4095);
}
while
(temp != value_Sensor1);
GPIO_WriteBit(GPIOD, GPIO_Pin_10,
Bit_RESET);
}
