i2c hangs using mbed on Samd21 xplain pro board [$25] about platform-atmelsam

`#include "mbed.h"
#include "string.h"

//--------Board pin Declarations
DigitalOut myled(PB30);
Serial pc(PA22,PA23);//tx, rx
DigitalIn interrupt1(PB04);
DigitalIn interrupt2(PB05);
I2C i2c(PA08,PA09);// I2C pins on Xplained Pro Board

char deviceAddress = 0x1D;

int main()
{
char byte_read[1];
char who_am_i[1];
who_am_i[0]=0xD;
byte_read[0]=0xFF;
while(1)
{

    i2c.start();                 // Start
    i2c.write(deviceAddress,who_am_i,1,true);
    i2c.stop();
    // done


wait_ms(500);
myled=1;
wait_ms(500);
myled=0;

}

}`

so if i use this code, in theory i should be writting two times on the SDA line isnt it? well on my scope i am only seeing one clock burst. so it is only sending the device address and it missed sending the register i want to read.

[ivankravets]

Does it work with mbed online IDE?

[ivankravets]

We have updated mbed framework. Do you still experience this problem?

[ivankravets]

Microchip left ARM mbed and ARM dropped support for this board. Please use Arduino framework instead.