Hello,
On our hardware there is a following connection: DRDY signal from ADS1298 is connected to GPIO_26 pin of the C5505 DSP (on the ECG development board this signal is connected to INT1 pin). I setup the interrupt to be on the pin GPIO26 on the falling edge. ADS is setup to work on a frequency of 500 sps.
With this setup I get only a couple of interrupts every second. Sometimes even not that much. The data looks valid, but the frequency of the interrupts is the problematic part.
Can somebody from TI's support take a look at this issue and provide us with some ideas on how to proceed. Are there some limitations of the frequency of interrupts on GPIO port in comparison with INT1 pin?
I'm using the exaclty same example software provided from TI as on a ECG development board.. There everything works properly, on our board the only difference is that the interrupt signal has been moved to different pin on a DSP. This is how I initialize the GPIO interrupt:
/* Open GPIO module */
hGpio = GPIO_open(&gpioObj, &status);
if((NULL == hGpio) || (CSL_SOK != status))
{
printf("GPIO_open failed\n");
return;
}
else
{
printf("GPIO_open Successful\n");
}
config.pinNum = CSL_GPIO_PIN26;
config.direction = CSL_GPIO_DIR_INPUT;
config.trigger = CSL_GPIO_TRIG_FALLING_EDGE;
GPIO_configBit (hGpio, &config);
GPIO_enableInt(hGpio, CSL_GPIO_PIN26); // Set pin 26 as interrupt source
IRQ_plug(GPIO_EVENT, &int1_isr);
IRQ_enable(GPIO_EVENT);
IRQ_globalEnable();
Thank you for any suggestions.
