NET+OS 6.1 Training

GPIO APIs

NET+OS 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

NET+OS Legacy Support Signal Multiplexing not addressed in legacy product. –Drivers would configure as needed. –Last come / Last served It’s always good to be the last thread spawned.

NET+OS 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

Multiplexing Serial Four serial ports A through D, map to “/com/0” through “/com/3” –2, 4, 6, 8 wire applications –SPI

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.

Multiplexing IEEE-1284 IEEE-1284 –Some signals available on primary or alternate pins

Other Multiplexing USB Over-current USB Power Relay Ethernet CAM 2 DMA channels 16 Timers 4 IRQ’s

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

Review Current gpio.h Easy and Fast BSP customization. Remove multiplexing dependencies from the drivers.