Android email widget not updating
The following section “About Android and USB Host” again concludes why USB-Host is becoming more and more important for mobile devices and points out main differences between Android ADK (Android Accessory Development Kit) and the Android USB Host API.
EDIT: control transfers for FTDI equiped Arduinos Since we got requested a lot if the FTDI Usb-Serial converter will work too, here ist the control transfer code that needs to be exchanged.
By notifying s Send Lock of the Usb Controller the data will be transferred.
During USB initialization, the Arduino USB serial converter is set up and after that, communication is done using the bulk IN endpoint of the very same serial converter.
With both the aforementioned firmware installed your Arduino board and the Android application installed on your phone or tablet, you will be able to control the brightness of the Arduino Uno’s built-in LED with a slider on your Android device.
The interrupt routine is extremely basic: The RX data has to be read in the ISR (interrupt service routine) from UDR0; have a look at the Atmega328P reference manual for further details.
Since we are doing no multi-buffering shenanigans the handling is extremely simple (no need to call cli() or anything).