Posted on March 21, 2015 at 17:15Hi Clive I understand what your suggesting. If I understand correctly you would have to hold the first ADC value to be able to compare it as the cycle passes over.
I have been attempting other methods and have found a way of doing it. Now the count holds once the count has incremented until the ADC goes lower and then it is able to increment once the ADC goes high again.
Its worth noting when reading that with no volts on the ADC it read 4095 and when it had 5v on it was around 3066 figure so the difference will be around 1029.
It currently looks a bit messy so I will attempt at tidying it up.
Thank you for your help.
The code is.
int main(void)
{
int sensor_count = 0;
int cycle;
int A, B, C, D;
PA0_button_setup();
LED_Setup();
GPIO_ResetBits(GPIOB, GPIO_Pin_1 );
adc_configure(); //Start configuration
PB1_Pin_Setup();
ConvertedValue = adc_convert(); //Converted value read from ADC
while (1)
{
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) && cycle == 0)
{
cycle = 1;
GPIO_SetBits(GPIOD, GPIO_Pin_15 |GPIO_Pin_14);
GPIO_SetBits(GPIOB, GPIO_Pin_1);
if (sensor_count >=3)
{
GPIO_ResetBits(GPIOD, GPIO_Pin_15 |GPIO_Pin_14);
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
}
while (!(sensor_count >= 3))
{
ConvertedValue = adc_convert();
A = ConvertedValue;
B = 4095;
C = (B - A);
cycle = 1;
switch (cycle)
{
case 1:
if (C > 850 && ! D == 0)
{
cycle = 2;
D = 0;
}
case 2:
if ((cycle == 2))
{
cycle = 3;
sensor_count++;
D = 0;
}
else
{
cycle = 1;
D = 0;
}
case 3:
if ( C < 850)
{
D = 1;
}
break;
default:
{
GPIO_ResetBits(GPIOD, GPIO_Pin_15 |GPIO_Pin_14);
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
cycle = 0;
sensor_count = 0;
}
}
}
GPIO_ResetBits(GPIOD, GPIO_Pin_15 |GPIO_Pin_14);
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
cycle = 0;
sensor_count = 0;
}
else
{
GPIO_ResetBits(GPIOD, GPIO_Pin_15 |GPIO_Pin_14);
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
cycle = 0;
sensor_count = 0;
}
}
}
