- last edited on by
Lina DABASINSKAITE
Hi, I've just started using TouchGFX. I'm using the STM32F429-DISCO development kit. I created the screen you see above via TouchGFX. I want the frequency variable I wrote earlier to come next to the "Frequency" section. At the same time, I want the width variable I wrote to come next to the "Duty Cycle" section. Since this Decode is a HALF_TIME_IC_Capture Callback function, I don't know where I should run it and with which code I should press the screen. Model.cpp , Screen1View etc. I'd appreciate it if you could help. i'm sorry about my English.
This is my code.
#define TIMCLOCK 90000000
#define PSCALAR 0
#define numval 100
#define MIN(a,b) ((a) < (b) ? (a) : (b))
int riseCaptured = 0;
int fallCaptured = 0;
uint32_t riseData[numval];
uint32_t fallData[numval];
float frequency = 0;
float width = 0;
int isMeasured = 0;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
// If the Interrupt is triggered by 1st Channel
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
{
riseCaptured = 1;
}
// If the Interrupt is triggered by 2nd Channel
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
fallCaptured = 1;
}
/* Rest of the calculations will be done,
* once both the DMAs have finished capturing enough data */
if ((riseCaptured) && (fallCaptured))
{
// calculate the reference clock
float refClock = TIMCLOCK/(PSCALAR+1);
int indxr = 0;
int indxf = 0;
int countr = 0;
int countrf = 0;
float riseavg = 0;
float rfavg = 0;
/* In case of high Frequencies, the DMA sometimes captures 0's in the beginning.
* increment the index until some useful data shows up
*/
while (riseData[indxr] == 0) indxr++;
/* Again at very high frequencies, sometimes the values don't change
* So we will wait for the update among the values
*/
while ((MIN((riseData[indxr+1]-riseData[indxr]), (riseData[indxr+2]-riseData[indxr+1]))) == 0) indxr++;
/* riseavg is the difference in the 2 consecutive rise Time */
/* Assign a start value to riseavg */
riseavg += MIN((riseData[indxr+1]-riseData[indxr]), (riseData[indxr+2]-riseData[indxr+1]));
indxr++;
countr++;
/* start adding the values to the riseavg */
while (indxr < (numval))
{
riseavg += MIN((riseData[indxr+1]-riseData[indxr]), riseavg/countr);
countr++;
indxr++;
}
/* Find the average riseavg, the average time between 2 RISE */
riseavg = riseavg/countr;
indxr = 0;
/* The calculation for the Falling pulse on second channel */
/* If the fall time is lower than rise time,
* Then there must be some error and we will increment
* both, until the error is gone
*/
if (fallData[indxf] < riseData[indxr])
{
indxf+=2; indxr+=2;
while (fallData[indxf] < riseData[indxr]) indxf++;
}
else if (fallData[indxf] > riseData[indxr])
{
indxf+=2; indxr+=2;
while (fallData[indxf] > riseData[indxr+1]) indxr++;
}
/* The method used for the calculation below is as follows:
* If Fall time < Rise Time, increment Fall counter
* If Fall time - Rise Time is in between 0 and (difference between 2 Rise times), then its a success
* If fall time > Rise time, but is also > (difference between 2 Rise times), then increment Rise Counter
*/
while ((indxf < (numval)) && (indxr < (numval)))
{
/* If the Fall time is lower than rise time, increment the fall indx */
while ((int16_t)(fallData[indxf]-riseData[indxr]) < 0)
{
indxf++;
}
/* If the Difference in fall time and rise time is >0 and less than rise average,
* Then we will register it as a success and increment the countrf (the number of successes)
*/
if (((int16_t)(fallData[indxf]-riseData[indxr]) >= 0) && (((int16_t)(fallData[indxf]-riseData[indxr]) <= riseavg)))
{
rfavg += MIN((fallData[indxf]-riseData[indxr]), (fallData[indxf+1]-riseData[indxr+1]));
indxf++;
indxr++;
countrf++;
}
else
{
indxr++;
}
}
/* Calculate the Average time between 2 Rise */
rfavg = rfavg/countrf;
/* Calculate Frequency
* Freq = Clock/(time taken between 2 Rise)
*/
frequency = (refClock/(float)riseavg);;
/* Width of the pulse
* = (Time between Rise and fall) / clock
*/
width = ((rfavg)/((float)(refClock/1000000)))*1000; // width in ns
riseCaptured = 0;
fallCaptured = 0;
isMeasured = 1;
}
}
