SensorsのトピックRe: MMA9551 map multiple bits to the same GPIO pin

MMA9551 map multiple bits to the same GPIO pin

vladdogaru — Tue, 03 Feb 2026 21:18:33 GMT

Hi there! Is it possible to map a logical OR of multiple bits to the same GPIO pin? I ask because in flash mode we can use 4 pins, but might need more bits mapped to GPIO. For example, in the tilt application, mapping all three ANGFLG bits already leaves us with only one usable GPIO pin.

Thanks in advance.

Re: MMA9551 map multiple bits to the same GPIO pin

maureen — Thu, 13 Nov 2014 15:13:26 GMT

Hi Vlad,

Yes it is possible to do this, but you will need to write a small custom application to implement the logic. Then you can map the output of your custom application to a GPIO. Please see AN4129: Building Custom Applications on MMA9550L/MMA9551L. A sample custom application is also available for download.

Maureen