I am using the ECAP module to capture pulses from a fan tachometer. I tested my implementation with a PWM input that simulates the fan's frequency of operation. Capture operation works fine at input frequencies of 100 Hz and above.
At one point I lowered the PWM input frequency to 1 Hz, and the module stopped capturing timestamps for further pulses. I checked the capture registers on code composer studio and found that the CAP1 and CAP2 registers contained very high 32-bit values. I suspect an overflow occurred. Is this possible?
Is there a minimum capture frequency required on the input signal? If not, should the ECAP module be configured differently to capture low frequencies?
I am not currently generating an interrupt on the counter overflow (CTROVF) event.
