NET OS 6.1 Training

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NETOS 6.1 Training
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GPIO APIs
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NETOS 6.1 Signal Multiplexing

• System tradeoffs affecting pin count at
  design-time.
• NS9750 unit cost reduced by conserving pins.
• Applications select their function multiplexing
  based on system requirements. See HW Ref
  Manual.
• NS9750 multiplexing includes
• Serial
• IEEE-1284
• LCD
• Timers, DMA, Interrupts
• GPIO

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NETOS Legacy Support

• Signal Multiplexing not addressed in legacy
  product.
• Drivers would configure as needed.
• Last come / Last served
• Its always good to be the last thread spawned.

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NETOS 6.1 Compile Time API

• One header file contains all the multiplexing
  settings.
• Multiplexing errors are caught at compile time.
• System verification tool.
• Located in Platform directory gpio.h
• Either assign a group or leave it internal.
• Pins with all functions internal are GPIO enabled

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Multiplexing Serial

• Four serial ports A through D, map to /com/0
  through /com/3
• 2, 4, 6, 8 wire applications
• SPI

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Multiplexing LCD

• The LCD can be configured
• 4, 8, 18, 24 bit
• Dual 4 or 8 bit applications
• LCD Line End signal can be routed separate.
• Not required in all LCD applications.

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Multiplexing IEEE-1284

• IEEE-1284
• Some signals available on primary or alternate
  pins

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Other Multiplexing

• USB Over-current
• USB Power Relay
• Ethernet CAM
• 2 DMA channels
• 16 Timers
• 4 IRQs

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GPIO Pins

• All unassigned pins are available for GPIO
• Defaults to inputs
• Can be set to output, initial value 0 or 1.
• Two convenience functions
• MCgetGPIOpin
• MCsetGPIOpin

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Review Current gpio.h

• Easy and Fast BSP customization.
• Remove multiplexing dependencies from the drivers.