MSP430G2433: Signal detection through polling input register vs ADC measurement

abhishek Sabnis

Part Number: MSP430G2433

I my application, one of the port is set as input I/O and monitoring signal which is either High (V = 3V) or low (V = 0.5 V). based on status of this input pin MCU makes very important decisions.

Which method between polling vs ADC measurement is preferred in terms of accuracy if input signal in noisy? how software filters should be used to make correct decisions?

over 8 years ago

0 Caleb Overbay over 8 years ago

TI__Genius 15370 points

Hi Abhishek,

I would recommend using the I/O and setup the pin to interrupt on either a high to low transition or a low to high transition. This way you can put the device into a low power mode, consume less current, and not waste any cycles polling the pin. To keep track of the state of the pin, once an interrupt occurs for say a low to high transition, you can then reconfigure the pin to detect a high to low transition effectively keeping track of it's state.

Best regards,
Caleb Overbay