added UART driver - fixes #70

ARM-communication-protocol/USART2/include/USART_config.h

@@ -0,0 +1,28 @@
+/*****************************************/
+/* Author  :  Gehad Elkoumy              */
+/* Version :  V01                        */
+/* Date    :  11 Jun 2023                */
+/*****************************************/
+
+#ifndef USART_CONFIG_H
+#define USART_CONFIG_H
+
+/* 
+
+	Baud rate to be implemented 
+	
+	For 8MHz:-     Baudrate = Fclk/(16*BRR)
+	9600-> BRR = 52.083 :-
+	Fractionl = 1
+	Mantissa = 34
+	
+	115200-> BRR = 4.34 :-
+	Fractionl = 5
+	Mantissa = 4
+
+
+
+*/
+
+
+#endif

ARM-communication-protocol/USART2/include/USART_interface.h

@@ -0,0 +1,22 @@
+/*****************************************/
+/* Author  :  Gehad Elkoumy              */
+/* Version :  V01                        */
+/* Date    :  11 Jun 2023                */
+/*****************************************/
+
+#ifndef USART_INTERFACE_H
+#define USART_INTERFACE_H
+
+void MUSART2_voidInit(void);
+void MUSART2_voidSendData(u8 Copy_u16Data);
+void MUSART2_voidSendString(u8 *Copy_u8String);
+void MUSART2_voidSendNumbers(s32 Copy_s32Number);
+u8 MUSART2_u8ReceiveData(void);
+
+#endif
+
+
+
+
+
+

ARM-communication-protocol/USART2/include/USART_private.h

@@ -0,0 +1,27 @@
+/*****************************************/
+/* Author  :  Gehad Elkoumy              */
+/* Version :  V01                        */
+/* Date    :  11 Jun 2023                */
+/*****************************************/
+
+#ifndef USART_PRIVATE_H
+#define USART_PRIVATE_H
+
+typedef struct{
+	volatile u32 SR;
+	volatile u32 DR;
+	volatile u32 BRR;
+	volatile u32 CR1;
+	volatile u32 CR2;
+	volatile u32 CR3;
+	volatile u32 GTPR;
+}USART_t;
+
+
+#define 	USART2 		((USART_t *) 0x40004400)
+
+
+#define ZeroASCIICode       48
+
+
+#endif

ARM-communication-protocol/USART2/src/USART_program.c

@@ -0,0 +1,97 @@
+/*****************************************/
+/* Author  :  Gehad Elkoumy              */
+/* Version :  V01                        */
+/* Date    :  11 Jun 2023                */
+/*****************************************/
+
+#include "STD_TYPES.h"
+#include "BIT_MATH.h"
+
+#include "RCC_interface.h"
+#include "DIO_interface.h"
+
+#include "USART_interface.h"
+#include "USART_private.h"
+#include "USART_config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void MUSART2_voidInit(void)
+{
+	/*Enable clock of GPIO, AFIO , USART2*/
+	RCC_voidEnableClock(RCC_APB2,2);
+	//RCC_voidEnableClock(RCC_APB2,3);
+	RCC_voidEnableClock(RCC_APB2,0);
+	RCC_voidEnableClock(RCC_APB1,17);
+
+	/*pin mode*/
+	MGPIO_VoidSetPinDirection(GPIOA,PIN2,OUTPUT_10MHZ_AFPP);   // TX
+	MGPIO_VoidSetPinDirection(GPIOA,PIN3,INPUT_FLOATING);   // RX
+
+	/*	baud rate = 9600		*/
+	USART2 -> BRR = 0x341;
+
+	SET_BIT((USART2-> CR1), 3);			/* Enabling Transmitter */
+	SET_BIT((USART2-> CR1), 2);			/* Enabling Receiver */
+	SET_BIT((USART2-> CR1), 13);     	/* Enabling USART */
+
+	USART2 -> SR = 0;					/* Clearing status register */
+}
+
+void MUSART2_voidSendData(u8 Copy_u16Data)
+{
+	USART2 -> DR = Copy_u16Data;
+	while((GET_BIT((USART2 -> SR), 6)) == 0);
+	CLR_BIT(USART2->SR,6);
+
+}
+
+void MUSART2_voidSendString(u8 *Copy_u8String)
+{
+	while( (*Copy_u8String) != '\0' )
+		{
+			MUSART2_voidSendData(*Copy_u8String);
+			Copy_u8String++;
+		}
+}
+
+void MUSART2_voidSendNumbers(s32 Copy_s32Number)
+{
+	char arr[15];
+	/* convert number to string */
+	itoa(Copy_s32Number , arr , 10);
+	u8* string = (u8*)arr;
+
+	MUSART2_voidSendString(string);
+}
+
+u8 MUSART2_u8ReceiveData(void)
+{
+	u8 Loc_u8ReceivedData = 0;
+	/* wait until receive complete*/
+	while((GET_BIT((USART2 -> SR), 5)) == 0);
+	Loc_u8ReceivedData = USART2 -> DR;
+	return (Loc_u8ReceivedData);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

ARM-communication-protocol/USART2/src/main.c

@@ -0,0 +1,38 @@
+/*
+ * main.c
+ *
+ *  Created on: Jun 11, 2023
+ *      Author: Gehad Elkoumy
+ */
+
+#include"STD_TYPES.h"
+#include"BIT_MATH.h"
+
+#include"RCC_interface.h"
+#include"DIO_interface.h"
+#include"USART_interface.h"
+
+u8 x = 22;
+void main (void)
+{
+	/*initialize clocks*/
+	RCC_voidInitSysClock();
+
+	MUSART2_voidInit();
+	//MUSART2_voidSendString("hello world");
+	//s32 x=255;
+
+	while(1)
+		{
+			//MUSART2_voidSendString((u8*)"hello");
+			//MUSART2_voidSendString((u8*)"\r\n");
+			MUSART2_voidSendNumbers(x);
+			MUSART2_voidSendString((u8*)"\r\n");
+			//x++;
+
+		}
+
+
+
+}
+