GPi LED moudle clock tested OK

So I mounted the 4 digit LED module on top of the GPi and executed the gz_led_demo program, but nothing happened, all LEDs are off.  I was not surprised, because I know it won't start.  I GPi's 3V3 switched power off and then on again, and the LED module display the clock in hour and minute happily.

So far so good.  Jogging time.

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