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Add SD card support to the PIC32MX7 MMB board; Add regiser level debug instrumentatin for the PIC32 SPI driver

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Fix return values from sleep(), usleep(), and sigtimedwait().  Fix STM32 F2 I2C bug-for-bug compatibility

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STM32 OTF FS device.  USB console now works for me.  Some of these changes are hacks that need to be revisited.

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NxWM: Finishes touchscreen implementation; NuttX: Standardize touchscreen initialization interfaces for all boards

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Add circular DMA support to STM32 and STM32 serial driver; Add initial configuration for the Mikroelektronika PIC32MX7 MMB board

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