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Jul 21, 2023 135 likes •300 views

Andrew Frey Western Washington University Electronics Engineering Technology 2010 MCU: Freescale 9S12C32 32kBytes Flash EEPROM, 2kBytes RAM 24MHz Bus Frequency Memory Requirements <10kBytes ROM 1kByte RAM Resources

SLIDE 1

Andrew Frey Western Washington University Electronics Engineering Technology 2010

SLIDE 2

 MCU: Freescale 9S12C32

 32kBytes Flash EEPROM, 2kBytes RAM  24MHz Bus Frequency

 Memory Requirements

 <10kBytes ROM  1kByte RAM

 Resources Used

 1 SPI and 1 SCI port  9 GPIO pins

SLIDE 3

 Kernel

 TimeSlice  10ms period  4 Tasks

SLIDE 4

 CPLD: Xilinx XC2C256

 256 Macrocells, 16 Function Blocks  System Frequency: 1MHz

 Required Resources

 ~30 Macrocells

 Resources Used:

 8 GPIO pins

 Hierarchal VHDL Design

 9 VHDL modules (8 for SPI implementation)

SLIDE 5

 Different

States correspond to users actions

 Only 1

state(sleep mode) not user defined

First Code Entered Main Menu

User Code Management

Unlock Lock Sleep Mode

Button Pressed Inactivity Period Enter Code

*

#

SLIDE 6



WaitForSlice



Time Slice Scheduler



10ms period



KeyTask



Checks for keypress



Period: 10ms(sporadic)



Execution Time: ~50µs

SLIDE 7

 UITask

 Handles input from KeyTask  Updates the LCD screen  Saves user codes  Period: 20ms(sporadic)  Execution Time: ~2ms

 RFTask

 Configures Registers and sends data packets if valid

code has been entered

 Period: 100ms  Execution Time: ~500µs

SLIDE 8

Keypad I/O KeyTask() Key.c KeyInit() GetKey() WKDoorLock.c Key KeyFlag

SLIDE 9

WKDoorLock.c UITask() Key.c LD4Bit.c

LcdDispStrg() GetKey()

Key

FlashSaveCode()

SaveCode ProgFlash.c RFModules.c RFTask()

GoodCode

SLIDE 10

RFTask() RFModules.c WKDoorLock.c UITask() Startup

nRF24L01Init() TxConfig() GoodCode

nRF24L01+

LockMsg()

SLIDE 11

 L=Execution Time/Period  Lpeak = 50µs/10ms + 2ms/20ms + .5ms/100ms

= 11%

 Lavg = 4% based on amount of time in between uses

SLIDE 12

Module Tasks Functions Data WKDoorLock.c WaitFor Slice() UITask()

MsgOut

Code LCD4Bit.c

Lcd4BitInit()

RFModules.c RFTask() nRF24L01Init() TxConfig() LockMsg() Good_Code Key.c KeyTask() GetKey() KeyInit() Key ProgFlash.c

FlashSaveCode()

UserCode

SLIDE 13

 Detect_and_signal.vhd

 Decodes incoming Signal  Sends signal to motor driver  ~50-75 Macrocells used

 Spi_interface.vhd

 The master program for SPI implementaion  Consists of 8 other VHDL modules  ~30 Macrocells used

SLIDE 14

nRF24L01+ Spi_interface Spi_master.vhd Main.vhd

Detect/Decode

Motor Driver

MotorBF

SLIDE 15

 Macrocell usage:

 ~30/256 = 12%

SLIDE 16

Module Application Detect_and_Signal.vhd Decodes incoming signal. Sends signal to motor driver if the signal was the correct one. Spi_interface.vhd Interconnect structure of the SPI interface portion of the SPI master Sck_logic.vhd Generates an internal SCK by dividing the system clock as determined by CLKDIV. Upcnt5.vhd 5-bit counter Upcnt4.vhd 4-bit counter Spi_xmit_shift_reg.vhd Shift register that shifts data out on MOSI. 8 bit-shift register clocked on the SCK Spi_rcv_shift_reg.vhd Shift register that shifts data in on MISO. 8-bit shift register clocked on the SCK. Spi_control_sm.vhd Overall control of the SPI interface. Generates SS and control signals to the shift registers.