write in C for a STM32F446RE microcontroller Write a source library that contains the with the following public functions: void keypadInit(void); /Initiallized the GPIO to read the keypad. uint16_t readKeypad(void); //Returns the state of all of the keypad buttons in the return value at the moment the function is called. void decodeKeypad(uint16_t, char ); //Takes the state of the keypad and returns (by reference) an array of the key's pressed. The library should work with the following main: int main (void) { uint16_t key; char carray[17]; keypadInit(); while(1) { while(!(key = readKeypad())); /Get which keys pressed/ decodeKeypad(key, carray); /What are those keys/ printf("%s\n",carray); /Print those keys to screen/ while(readKeypad() == key); /Wait for the keypad to change*/ } } Problem 1: Write a library that works with the following pin assignments Row 0 -> PC0 Row 1 -> PC2 Row 2-> PC4 Row 3 -> PC6 Col 0-> PC8 Col 1->PC10 Col 2->PC12 Problem 2: Write a library that works with the following pin assignments Row 0 -> PC1 Row 1 -> PC3 Row2-> PC5 Row 3 -> PC7 Col 0-> PC9 Col 1->PC11 Col 2->PC13

Microsoft Visual C#

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter8: Advanced Method Concepts

Section: Chapter Questions

Problem 7RQ

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write in C for a STM32F446RE microcontroller

Write a source library that contains the with the following public functions:

void keypadInit(void); /Initiallized the GPIO to read the keypad.

uint16_t readKeypad(void); //Returns the state of all of the keypad buttons in the return value at the moment the function is called.

void decodeKeypad(uint16_t, char *); //Takes the state of the keypad and returns (by reference) an array of the key's pressed.

The library should work with the following main:

int main (void)
{
uint16_t key;
char carray[17];

keypadInit();

while(1)
{
while(!(key = readKeypad())); /*Get which keys pressed*/
decodeKeypad(key, carray); /*What are those keys*/
printf("%s\n",carray); /*Print those keys to screen*/
while(readKeypad() == key); /*Wait for the keypad to change*/
}
}

Problem 1: Write a library that works with the following pin assignments

Row 0 -> PC0

Row 1 -> PC2

Row 2-> PC4

Row 3 -> PC6

Col 0-> PC8

Col 1->PC10

Col 2->PC12

Problem 2: Write a library that works with the following pin assignments

Row 0 -> PC1

Row 1 -> PC3

Row2-> PC5

Row 3 -> PC7

Col 0-> PC9

Col 1->PC11

Col 2->PC13

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