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Bug #1435
closedsim card detect does not work (SW_SIM)
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Description
The SAM7 has (software-controlled) internal pull-up resistors, but no pull-down resistors.
Thus, we cannot simply attach the sim card detect contact between 3V3 and the GPIO. We either add a pull-down (bad, as it adds a component and power consumption), or we connect the SW2 pin of the SIM card socket to GND instead of 3V3
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