Espruino on your watch!

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fanoush
So I got the display working with the SSD1306 module :-)
```
SPI1.setup({mosi:6,sck:5,baud:8000000})
g=require("SSD1306").connectSPI(SPI1,D28,D4,function(){g.drawString("Hello",0,0);g.flip()},{cs:D29,height:32})
```
Looks like I have most of the hardware pinout covered. I have updated HW summary here DS-D6 Hardware I still guess on some analog input there could be real battery voltage (NRF.getBattery() returns 3.3 which s already regulated)

So now let's see how far can I go with Espruino to do some watch interface - showing time, setting alarms etc. So far it looks pretty usable.

BTW I noticed some strange issue, the HR sensor needs to be enabled by pin 26. When it is not done any i2c read on its bus hangs (forever?) and ctrl+c does not work, is there a way to break it? Or maybe some timeout?

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