After getting frustrated with microchips own AN1186, and having had some succes with https://github.com/sde1000/NanodeUNIO on the arduino, I've decided to port that library to the msp430.

Pins and clockspeed need to be configured in the header UNIO.h. Specifically, the following defines will probably need to be updated:

#define UNIO_EEPROM_ADDRESS (0xa0)
#define UNIO_PXIN     (P1IN)
#define UNIO_PXOUT    (P1OUT)
#define UNIO_PXDIR    (P1DIR)
#define UNIO_PXSEL    (P1SEL)
#define UNIO_PXSEL2   (P1SEL2)
#define UNIO_PIN      (0)
/* The number of clocks a us takes, as timings are minima,
   round this number up to the nearest integer.*/
#define UNIO_USCLKS   (8)

Tested with both the ti compiler (v17.3.0, c99), and gcc (6.2, -std=gnu99) on both the MSP430AFE253, and the MSP430F2013.