File content as of revision 0:59c04ca89ae2:

#include "mbed.h"
#include "max32630fthr.h"
Serial pc(USBTX, USBRX);
Serial uart(P5_3, P5_4, 9600);
I2C i2c(P5_7,P6_0); // SDA, SCL

DigitalOut pc_activity(LED1);
DigitalOut uart_activity(LED2);
 
int main() {
    uart.format(8,Serial::None,1);
    char    data[2]; 
    data[0] = 0x1A;     //MAX14960 BootCfg register
    data[1] = 0x30;     // Always-On Mode, off state via PWR_OFF_CMD
    i2c.write( 0x50, data, 2 );

    data[0] = 0x17;     //MAX14960 LDO3Vset register
    data[1] = 0x19;     //3.3V
    i2c.write( 0x50, data, 2 );
    
    data[0] = 0x16;     //MAX14960 LDO3cfg register
    data[1] = 0xE2;     //Enable LDO3
    i2c.write( 0x50, data, 2 );
      
    wait(1);
    while(1) {
        if(pc.readable()) {
            uart.putc(pc.getc());
            pc_activity = !pc_activity;
        }
        if(uart.readable()) {
            pc.putc(uart.getc());
            uart_activity = !uart_activity;
        }
    }
}