Hello everybody
I am currently developing an application that measures the pulse duration, using a PSoC counter, I am using a 4200L development card.
On the rising edge, I reload the value of the counter, and on the falling edge I use the interrupts, I read the value of the counter
PS: the duration of the out_pulse pulse is of value 2.04us.
can someone help me correct and move on the code, I read the value of the counter and I expect to get 91 or 92, but I get a much higher value around 130
I attach to this message the .zip project
Thanks in advance,
Soukayna,
Code:
/*******************************************************************************
* Function Name: main
********************************************************************************
*
* The main function performs the following actions:
* 1. Counter, PWM_2s, PWM_Pulse. and UART are started.
* 2. At the InPulse rising edge the Counter is reloaded (set to 0 value)
* 3. At the InPulse falling edge the Counter value is saved and the width
* of the input pulse InPulse is calculated
* 4. The UART sends the calculated width value to the PC terminal display
*
*******************************************************************************/
volatile int capture_flag = 0;
volatile uint16_t Counter_value = 0;
CY_ISR(isr_Counter)
{
uint32_t source;
isr_Counter_Disable();
source = Counter_GetInterruptSource();
if (source & Counter_INTR_MASK_CC_MATCH) {
capture_flag = 1 ;
Counter_value = Counter_ReadCounter();
}
Counter_ClearInterrupt(source);
}
int main(void)
{
/* Values used for calculation and captures are initialized */
//int pulseCaptureCount = 0;
//uint32 pulseCaptureCount = 0u;
char snum[32]; /* for string conversion */
/* Enable the Global Interrupt */
CyGlobalIntEnable;
/* Initialize the components */
PWM_2s_Start();
PWM_Pulse_Start();
isr_Counter_ClearPending();
isr_Counter_StartEx(isr_Counter);
Counter_Start();
UART_Start();
UART_UartPutString("Pulse duration measurement counter started\r\n");
for(;;)
{
/* Captures the counter value at the InPulse falling edge */
//pulseCaptureCount = Counter_ReadCapture();
/* Delay for stability... */
//CyDelay(100);
if (capture_flag) {
capture_flag = 0;
/* The counter captured value is printed */
sprintf(snum, "Measured: %d\n\r", Counter_value);
UART_UartPutString(snum);
Counter_WriteCounter(0);
isr_Counter_Enable();
}
}
} /* [] END OF FILE */
Schematic:
