Host Shield Teensy Teensy++----------- ------ --------SS 10 10INT 9 9MOSI 2 22MISO 3 23SCK 1 21Reset Vcc Vcc+3.3V Vcc (MCP1825) Vcc (must use MCP1825)GND GND GND
Circuits At Home 2010USB Host Shield QC test routinePress any key to continue...Reading REVISION register...Die revision 03Test PASSEDChecking GPIO lines. Install GPIO loopback adapter and press any key to continue...GPIO read/write mismatch. Write: 0 Read: FFGPIO check failed. Make sure GPIO loopback adapter is installedSPI test. Each '.' indicates 64K transferred. Stops after transferring 1MB (16 dots)................Test PASSEDOscillator start/stop test. Oscillator state is ONSetting CHIP RESET. Oscillator state is OFFClearing CHIP RESET. PLL is stable. Time to stabilize - 521 cyclesTest PASSEDUSB Connectivity test. Waiting for device connection...
As wired, at least as nearly as I can tell using my ohm-meter, the USB host power is connected to the +3 volt power. For use with a Teensy converted to 3 volts, but powered from a USB cable supplying 5 volts, I think the best option would be the cut the host power jumper and solder a wire from the 5 volt pad on the bottom of the Teensy board to the host power pad that becomes isolated if that jumper is cut. Maybe? Of course, this isn't really nice for mounting either board in a DIP socket. The 5V power power pad is on the bottom side of Teensy, and the host power pad on the USB Mini Host Shield is so close the USB host connector shell that I'm not sure I can solder a wire in place without shorting the power.
I suppose I'll try it first with 3 volts to the USB host power. Do many USB devices work with only 3.3 volts?
I didn't see the board test example in version 2.0. Did I miss it, or is it available somewhere for 2.0?