CSE321_Project2_aryanshs_main

---

About

---

• Project Description: Explore design and implementation in a bare metal system with a combination lock/security system
• Contribitor List: Aryansh Sharma

---

Features

---

Explore design and implementation in a bare metal system with a combination lock/security system. The LCD will lock/unlock based on if you enter the right code/password

---

Required Materials

---

• LCD (1602 or 1802)
• Nucleo
• Keypad
• Solderless Breadboard
• Jumper wires
• LEDs
• Resistors

---

Resources and References

---

• https://www.st.com/resource/en/reference_manual/dm00310109-stm32l4-series-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

---

Getting Started

---

• Assemble and connect the hardware pieces
• Clone the project using git clone {url}
• Navigate to the cloned repoository
• Plug in the microcontroller and run the code in CSE321_project2_aryanshs_main.cpp

---

CSE321_project2_aryanshs_main.cpp:

---

The implementation and the code is in the above mentioned file

---

• Things Declared

---

• Imports:

  • 'mbed.h'
  • 'PinNames.h'
  • cstdint
  • cstdio
  • stdio.h
  • string.h
  • "lcd_1602.h"

• Variables:

  • int increment
  • char code
  • char RightCode
  • int32_t output_zero
  • int32_t output_one
  • int32_t outputPB4_ones
  • int32_t outputPB4_zeroes
  • int32_t outputPB3_ones
  • int32_t outputPB3_zeroes
  • int32_t input_pin
  • bool locked
  • lcd (inherited from CSE321_LCD)

• Functions:

  • KeyHandler8
  • KeyHandler9
  • KeyHandler10
  • KeyHandler11
  • newHandler
  • check
  • lightlcd

---

• API and Built In Elements Used

---

• ISR
• InterruptIn
• LCD API
• Bounce

---

• Custom Functions

---

• KeyHandler8
  • An ISR function for first column that checks which row the current is flowing from
  • Inputs: None
  • Gloal variables used: increment, newHandler()
• KeyHandler9
  • An ISR function for second column that checks which row the current is flowing from
  • Inputs: None
  • Gloal variables used: increment, newHandler()
• KeyHandler10
  • An ISR function for third column that checks which row the current is flowing from
  • Inputs: None
  • Gloal variables used: increment, newHandler()
• KeyHandler11
  • An ISR function for fourth column that checks which row the current is flowing from
  • Inputs: None
  • Gloal variables used: increment, newHandler()
• newHandler
  • Function that handles the configuration of toggling led on and off at the press of a button on the keypad
  • Inputs: None
  • Global variables used: None
• check
  • Function that checks if the code entered is right or wrong
  • Inputs: int inc
  • Global variables used: increment, lightlcd()
• lightlcd
  • Function that handles what to display on the LCD
  • Inputs: bool lock
  • Global variables used: bool locked, lcd (class inherited from CSE321_LCD)