LAB: GPIO Digital InOut

LAB: GPIO Digital InOut

Date: 2023-09-19

Author/Partner:

Github: repository link

Demo Video: Youtube link

PDF version:

Introduction

In this lab, you are required to create a simple program that toggle multiple LEDs with a push-button input. Create HAL drivers for GPIO digital in and out control and use your library.

You must submit

• LAB Report (*.pdf)

• Zip source files(main*.c, ecRCC.h, ecGPIO.h etc...).

  • Only the source files. Do not submit project files

Requirement

Hardware

• MCU

  • NUCLEO-F411RE

• Actuator/Sensor/Others:

  • LEDs x 3

  • Resistor 330 ohm x 3, breadboard

Software

• Keil uVision, CMSIS, EC_HAL library

Problem 1: Create EC_HAL library

Procedure

Create the library directory \repos\EC\lib\.

Save your header library files in this directory. See here for detail.

DO NOT make duplicates of library files under each project folders

Create your own library for Digital_In and Out : ecGPIO.h, ecGPIO.c

• Download library files from here

• Use the provided ecRCC.h and ecRCC.c

• Modify ecGPIO.c, ecGPIO.h

ecRCC.h (provided)

void RCC_HSI_init(void);  
void RCC_GPIOA_enable(void);   
void RCC_GPIOB_enable(void); 
void RCC_GPIOC_enable(void);

ecGPIO.h

void GPIO_init(GPIO_TypeDef *Port, int pin,  int mode);  
void GPIO_write(GPIO_TypeDef *Port, int pin,  int output);  
int  GPIO_read(GPIO_TypeDef *Port, int pin);  
void GPIO_mode(GPIO_TypeDef* Port, int pin, int mode);  
void GPIO_ospeed(GPIO_TypeDef* Port, int pin,  int speed);  
void GPIO_otype(GPIO_TypeDef* Port, int pin,  int type);  
void GPIO_pupd(GPIO_TypeDef* Port, int pin,  int pupd);

• Example code

/* ecGPIO.c  */

// Input(00), Output(01), AlterFunc(10), Analog(11)
void GPIO_mode(GPIO_TypeDef *Port, int pin, int mode){
   Port->MODER &= ~(3UL<<(2*pin));     
   Port->MODER |= mode<<(2*pin);    
}

Problem 2: Toggle LED with Button

Procedure

1. Create a new project under the directory \repos\EC\LAB\

• The project name is “LAB_GPIO_DIO_LED”.

• Name the source file as “LAB_GPIO_DIO_LED.c”

• Use the example code provided here.

2. Include your library ecGPIO.h, ecGPIO.c in \repos\EC\lib\.

You MUST write your name in the top of the source file, inside the comment section.

3. Toggle the LED by pushing the button.

• Push button (LED ON), Push Button (LED OFF) and repeat

Configuration

Button (B1)	LED
Digital In	Digital Out
GPIOC, Pin 13	GPIOA, Pin 5
PULL-UP	Open-Drain, Pull-up, Medium Speed

Code

Your code goes here:

Explain your source code with necessary comments.

Sample Code

#define LED_PIN 	5
#define BUTTON_PIN 13

void setup(void);
	
int main(void) { 
	// Initialiization
	setup();
	
	// Inifinite Loop 
	while(1){
		if(GPIO_read(GPIOC, BUTTON_PIN) == 0)		GPIO_write(GPIOA, LED_PIN, HIGH);
		else 										GPIO_write(GPIOA, LED_PIN, LOW);
	}
}


// Initialiization 
void setup(void)
{
	RCC_HSI_init();	
	GPIO_init(GPIOC, BUTTON_PIN, INPUT);  // calls RCC_GPIOC_enable()
	GPIO_init(GPIOA, LED_PIN, OUTPUT);    // calls RCC_GPIOA_enable()
}

Discussion

1. Find out a typical solution for software debouncing and hardware debouncing.

2. What method of debouncing did this NUCLEO board use for the push-button(B1)?

Problem 3: Toggle LED with Button

Procedure

1. Create a new project under the directory \repos\EC\LAB\

• The project name is “LAB_GPIO_DIO_multiLED”.

• Name the source file as “LAB_GPIO_DIO_multiLED.c”

You MUST write your name in the top of the source file, inside the comment section.

2. Include your library ecGPIO.h, ecGPIO.c in \repos\lib\.

3. Connect 4 LEDs externally with necessary load resistors.

• As Button B1 is Pressed, light one LED at a time, in sequence.

• Example: LED0--> LED1--> …LED3--> …LED0….

Configuration

Button	LED
Digital In	Digital Out
GPIOC, Pin 13	PA5, PA6, PA7, PB6
PULL-UP	Push-Pull, Pull-up, Medium Speed

Circuit Diagram

Circuit diagram

You need to modify the circuit diagram

image

Code

Your code goes here

Explain your source code with necessary comments.

// YOUR MAIN CODE ONLY

Results

Experiment images and results

Show experiment images /results

Add demo video link

Discussion

1. Find out a typical solution for software debouncing and hardware debouncing. What method of debouncing did this NUCLEO board use for the push-button(B1)?

Answer discussion questions

Reference

Complete list of all references used (github, blog, paper, etc)

Troubleshooting

(Option) You can write a Troubleshooting section