Hello all I have been working on an issue with our production board and are now changing the LED pulse configuration. Our goal is to run the LED over ~1.8 frames and then turn off. Then on the 2 frame the other LED will turn on. We are using the Vsync pulse as our interrupt for the LED toggling.
We are running at 15 fps and that gives us a Vsync of ~66ms. When I have the pulseTime set to anything less than 66 ms it functions correctly and each LED will begin its pulse every 4th frame as it should. However, as soon as I increase it to say 70, both LEDs stay on and do not toggle. I would have expected this if I had the time to be 66*4 = 264 ms. Any help would be appreciated.
Our current setup is the following:
/* Create the thread for the application */
retThrdCreate = CyU3PThreadCreate(
&gpioThread, /* GPIO Example App Thread structure */
"21:GPIO_simple_output", /* Thread ID and Thread name */
GpioThread_Entry_Simple, /* GPIO Example App Thread Entry function */
0, /* No input parameter to thread */
ptr, /* Pointer to the allocated thread stack */
CY_FX_GPIOAPP_THREAD_STACK, /* Thread stack size */
CY_FX_GPIOAPP_THREAD_PRIORITY, /* Thread priority */
CY_FX_GPIOAPP_THREAD_PRIORITY, /* Preemption threshold for the thread. */
CYU3P_NO_TIME_SLICE, /* No time slice for the application thread */
CYU3P_DONT_START /* Start the Thread immediately */
);
Create the thread
Enter thread
while(1){
uint32_t eventFlag;
// Wait for a VSYNC High Signal before starting the LED Fire process
CyU3PReturnStatus_t apiRetStatus = CyU3PEventGet( &glFxGpioAppEvent,
CY_FX_GPIOAPP_GPIO_HIGH_EVENT, CYU3P_EVENT_OR_CLEAR,
&eventFlag, CYU3P_WAIT_FOREVER);
if (apiRetStatus != CY_U3P_SUCCESS)
continue;
if (IR_flag == CyTrue)
{
// We are wanting to make sure that we hold the LED flash over the course of 123 msec so
// we need to pulse the IR_led over 2 pulses
if (frameCounterL != 1){
PulseIRLED( 123, CX3_IR_LED_RIGHT);
frameCounterL++;
}
else{
frameCounterL = 0;
IR_flag = CyFalse;
}
}
else
{
if (frameCounterR != 1){
PulseIRLED( 123, CX3_IR_LED_LEFT);
frameCounterR++;
}
else{
frameCounterR = 0;
IR_flag = CyTrue;
}
}
}
// Pulse IRLED
// ========================================================================================================
void PulseIRLED( const uint16_t wPulseWidth, const uint8_t IRLED)
{
gpioIRComplexConfig.outValue = IR_LED_ENABLE;
gpioIRComplexConfig.pinMode = CY_U3P_GPIO_MODE_PULSENOW;
#ifdef TIME_IN_US
gpioIRComplexConfig.threshold = CY_FX_PWM_PERIOD_MS / 1000 * wPulseWidth;
#else
gpioIRComplexConfig.threshold = CY_FX_PWM_PERIOD_MS * wPulseWidth;
#endif // TIME_IN_US
CyU3PGpioSetComplexConfig( IRLED, &gpioIRComplexConfig);
CyU3PGpioComplexPulseNow( IRLED, gpioIRComplexConfig.threshold);
} // PulseIRLED
