Solar Telematics System Design Constraint Analysis Presentation Brian Kelley Clayton Dickemann Dan Ehrman Craig Lechlitner

Updated Block Diagram

Wireless

PSSCs 1. An ability to track vehicle location through GPS. 2. An ability to receive and send CAN messages from and to other systems in the car. 3. An ability to display graphics on the LCD display. 4. An ability to respond to user input using a touchscreen. 5. An ability to store and load data to and from non-volatile memory.

Primary Criteria Project must be maintained by other PSR members –We have dev. tools and programming experience with PIC devices Space Some information must be visible at all times Must be readable in moderate sunlight

Computation Requirements Control Microcontroller –GPS, CAN, UART x2, SPI –Low CPU usage Graphics Controller –800x480 at 4 Hz (absolute minimum), Hz desired –Rendering images –Reading from SD card –Generating sound

GPIO Requirements PIC32PIC24DA SPI Chip Select03 Touch Screen Interrupts02 SPI Data Ready11 LCD Backlight Enable01 Debug LED11 Optoisolated External InputsTBD0 Total2+TBD8

On-Chip Peripherals PIC32PIC24DA Graphics ModuleNoYes SPI13 PWM02 CAN10 PMPNo20-bit addr, 16-bit data UART31

Off-Chip Peripherals GPS: LS MB, 10ns SRAM: ISSI IS61WV102416BLL SD Card: 2 GB Touchscreen Controller: TSC2000 Audio Volume Control: MCP4241 Audio Low-Pass Op-Amp: MCP602 Audio Amplifier: LM4950

Power Constraints Need to keep power reasonable, but not a huge concern Design will take about 6 W Should be a reasonable size for a small car Needs to be easily usable by a driver Packaging Constraints

PIC24DA + Has rectangle copy/character gen. + CPU can manually access pixels + Has a deflate processor + Is a microcontroller - Has to use SRAM, which is expensive Epson S1D Can interface with SDRAM + Has better alpha blending - 8-bit interface - Silly Command Interface

PIC32 + PSR standard + PSR CAN library already created + Has lots of extras + Experience - MIPS isn’t as “real- world” as ARM STM32F103CB + 48-pin + ARM is in everything + Single-cycle multiply and divide + Temp. sensor - Only one SPI - Never used before

Questions?