1. Turbine Flow Meter Kevin Hooks Senior Design Project

2. Overview Micro Controller Kernel, Tasks, CPU Load Data Flow Diagrams State Machine Diagrams Module, Public Tasks, Functions and Variables Questions?

3. Micro Controller HC9S12DP512 16-bit device 512K bytes Flash EEPROM, 14K bytes RAM, 4K bytes of EEPROM 2 SCI, 3 SPI, 8-channel IC/OC ECT, two 8- channel, 10-bit ADC, 8 channel PWM, 29 GPIO, 20 GPIO with interrupts 24 MHz Bus Frequency

4. Micro Controller About < 300 Kbytes Flash EEPROM 1 SCI 1 SPI 2 IC/IOC (1 input capture, 1 Pulse Accumulator)

5. Kernel Time Slicing Period of 1s Total Tasks 5 1 Interrupts

6. Tasks LCD_Update Pulse_Count Period_Count Thermo_Get Calculate_Values

7. LCD_Update Checks for Display Units Compares Current LCD Value with new LCD Value If different then update LCD display Run Time ~10ms max, ~1ms Average CPU Load ~ 10ms/1s = 10% max, ~1ms/1s = 1% average

8. Pulse_Count Counts Pulses for 10ms Stores Value in public variable *Pulse_Val Run Time ~10ms CPU Load ~10ms/1s = 10%, should always be 10ms

9. Period_Count Counts the period of one pulse Stores value in public Variable *Period_Val Run Time Varies based on Frequency (Max of 1ms at frequency of 10kHz average of.5ms at 50kHz) CPU Load ~1ms/1s = 1% max, ~.5ms/1s =.5% average

10. Thermo_Get Performs an SPI read for one 16-bit value from the MAX6675 and stores into variable Thermo_Val. Only 12 bits are used so it will need to be masked. At 24MHz clock the runtime is max ~10uS CPU Load = ~10us/1s =.001%

11. Calculate_Values Receives variables from each get task and performs a series of calculations to provide one final 8-bit result New_Value Checks for variable set by touch screen ISR to determine calculations for correct units Run Time ~10us CPU Load = ~10us/1s =.001%

12. Get_Touch ISR If a screen touch is detected, jump to ISR This ISR simply sets a variable to a specific value. This will be used to determine unit display Run Time is ~1uS

13. Final CPU Load Max CPU Load = 10ms/1s + 10ms/1s + 1ms/1s + 1us/1s + 1us/1s = 21.002% Average CPU Load = 16.502%

14. Data Flow Diagram: LCD_Update Task

15. Data Flow Diagram: Pulse_Count

16. Data Flow Diagram: Period_Count

17. Data Flow Diagram: Thermo_Get

18. Data Flow Diagram: Calculate_Values

19. Data Flow Diagram: SCI_Read_Isr

20. State Diagram for UI Initial State

21. Modules, Tasks, Public Data ModulesTasksPublic Functions and Data Main.cWaitForSlice(), LCD.c Modified from Trevor Wilcox LCD_Update()Prev_Val Disp_Val() Get_Touch() Compare_Val() SCI_read_Isr() Calculation.cCalculate_values()New_Val Unit_Val OCDelay.c Todd Morton SPI.cThermo_Get()Thermo_Val ECT.cPulse_Count(), Period_Count() Pulse_Val, Period_Val 9S12DP256Start.c Todd Morton

22. Questions?