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Project PRINT TCSP 6 Software Design Narrative

This project outlines a smart printer power management system that utilizes a power indicator LED as a light sensor to monitor light levels and control the printer's power. Incoming print jobs are routed to a local storage or printer based on light conditions. The system employs a PIC32MX795F512 microcontroller, integrates SPI-to-Ethernet communication, and features comprehensive software design considerations, including ADC light sensing and LCD display updates. The architecture ensures efficient job management and power savings through intelligent sensor data processing and routing.

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Project PRINT TCSP 6 Software Design Narrative

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  1. Project PRINT TCSP 6 Software Design Narrative Team 8 Vineeth Harikumar

  2. Project Abstract • Printer power management system • Use the power indicator LED as a light sensor • Control printer's power based on light levels • Route incoming print jobs to local storage/printer

  3. Block Diagram 110VAC 3 3 110VAC 4 Ethernet Power Relay RPG SD Card 6 PIC32MX795F512HMicrocontroller SPI-to-Ethernet Controller Ethernet LED 100 ohms 16 4 ? SM Power Supply (to all components) LCD Display 2 4 5VDC

  4. Software Design Considerations SPI • MICRO SD • SPI-to-Ethernet Controller UART • Debugging ADC • LED light sensing GPIO pins • LCD

  5. Software Design Hybrid design • Interrupts • UART - Debugging • Timers - light sensing routines, timeouts • SPI-to-Ethernet controller • Polling • Store incoming bytes to SD card • Transmit bytes from SD card • Check flags for updating LCD • Check flags for LED light sensing routines

  6. Software Design Reset initializeSPI() initializeUART() initializeADC() while(1) configureInterrupts() initializeSDCard() writeIncomingPacketsToSDCard() readAndForwardPacketsOnSPI() sampleADCVoltage() updateLCD() controlPrinterMode()

  7. Code Hierarchy main.c SPI.h ADC.h LCD.h SDCARD.h TIMER.h UART.h initLCD() sendCommand() sendByte() initSPI() SPIinterrupts() configTimer() TIMER_ISR() initSDCard() ReadSector() WriteSector() initUART() UART_ISR() WriteString() initADC() sampleADC()

  8. Initializations ADC • Pins AN4 & AN5 • External VREF+ & VREF- • Manual scanning mode LCD • 12 GPIO Pins • 8 data pins for DB0-DB9 • Register select, Read/Write mode, Clock

  9. Initializations UART • UART1 Receiver and Transmitter • 8 bit data size • 0 parity bits, 1 stop bit • Data rate = 38400bps TIMER • Timer Channel 1 • 10ms interrupts

  10. Initializations SPI • MicroSD card • 3 pins (SCK,SDO, SDI) • Read/Write transfer rate 10Mbps • SPI-to-Ethernet controller • Implemented with two interrupt pins and SPI • Maximum data transfer rate of upto 10Mbps

  11. Code Completion Status

  12. Questions?

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