UART_string

//code for sending a string via uart method from board to pc via open sda port
#include "MKL46Z4.H"
#include "string.h"
# define len 40
void sw1(){
	SIM_SCGC5=SIM_SCGC5|SIM_SCGC5_PORTC_MASK;
	PORTC_PCR3=1u<<8|1u<<1|1u<<0;
	GPIOC_PDDR=GPIOC_PDDR&~(1u<<8);
}
void sw2(){
	SIM_SCGC5=SIM_SCGC5|SIM_SCGC5_PORTC_MASK;
	PORTC_PCR12=1u<<8|1u<<1|1u<<0;
	GPIOC_PDDR=GPIOC_PDDR&~(1u<<8);
}
void green()
{
	SIM_SCGC5=SIM_SCGC5|SIM_SCGC5_PORTD_MASK;
	PORTD_PCR5=1u<<8;
	GPIOD_PDDR=1u<<5;
	GPIOD_PSOR=1u<<5;
}
void red()
{
	SIM_SCGC5=SIM_SCGC5|SIM_SCGC5_PORTE_MASK;
	PORTE_PCR29=1u<<8;
	GPIOE_PDDR=1u<<29;
	GPIOE_PSOR=1u<<29;
}
void redon()
{
	GPIOE_PCOR=1u<<29;
}
void greenon()
{
	GPIOD_PCOR=(1u<<5);
}
void greenoff()
{
	GPIOD_PSOR=1u<<5;
}
void redoff()
{
	GPIOE_PSOR=1u<<29;
}
int sw1stat()
{
	if(GPIOC_PDIR==4096||GPIOC_PDIR==0)
	return 1;
	else
		return 0;
}
int sw2stat()
{
	if(GPIOC_PDIR==8||GPIOC_PDIR==0)
		return 1;
		else
			return 0;
}
int getgreenstatus()                             //READ DATA FROM PORT DATA INPUT REGISTER OF GREEN LED
{
	if( GPIOD_PDIR==1u<<5)
		return 0;
	else
		return 1;
}
int getredstatus()                             //READ DATA FROM PORT DATA INPUT REGISTER OF RED LED
{
	if( GPIOE_PDIR==1u<<29)
		return 0;
	else
		return 1;
}
void UART_Init(void){
	SIM_SOPT2=(1u<<26);//SIM_SOPT2_UART0SRC(1);Clock to UART0 MCGFLLCLK 20.97152MHz as MCG_C4=0x00 low range 20Mhz
	//SIM_SOPT5=0x00;kar na kar
	//open-drain mode disabled(Clear bit 16) plus
	//connection to UART_TX and UART_RX(Module to module interconnect) Clear bit 2,1 and 0
	SIM_SCGC4=SIM_SCGC4|(1u<<10);//set bit 10 for giving clock to UART0
	SIM_SCGC5=SIM_SCGC5_PORTA_MASK;//set bit 9 for giving clock to PORTA
	PORTA_PCR1=PORTA_PCR1&~(1u<<10)|(1u<<9)&~(1u<<8);//PTA1 as UART1_RX (010  9 for alternative 2 which is UART0_RX)
	PORTA_PCR2=PORTA_PCR1&~(1u<<10)|(1u<<9)&~(1u<<8);//PTA2 as UART1_TX (010  9 for alternative 2 which is UART0_TX)
	UART0_C2=0x00;//TX and RX both disabled
    UART0_BDH=0x00;//0x02;//Baud rate =9600,20.97152Mhz clock
    UART0_BDL=0x88;//BR=136//0x22;//BR=132.5=132=100111000
    UART0_C1=0x00;
    //UART0_S2=UART0_S1 & 0xC1;
    UART0_C3=0x00;
    UART0_C4=0x0F;//OSR=15//OSR=3
    UART0_C5=0x00;//not both edges 0x02;//as OSR=4, sampling on both edges of baud rate clock of received data
    UART0_C2=UART0_C2 | (1u<<3);//only TX enable
    //UART0_C2=UART0_C2 | (1u<<2);//for RX pin to enable
}

void InitSYSTICK(void)
{
	//this is a 24 bit down counter
	SysTick->CTRL=0;//disable timer
	SysTick->LOAD=0x00FFFFFF;//load to full value 0x00FFFFFF
	SysTick->VAL=0;//write anything to reset register
	SysTick->CTRL=0x00000004;//1=bus clock, 0=disable interrupt, 0=disable systick
}
void delay(void)
{
	SysTick->VAL=0;//reset counter
	SysTick->CTRL=0x00000005;//enable counter
	while((SysTick->CTRL & 0x00010000) == 0)//check flag
		{

		}

}
unsigned char UART_InChar(void)
{

	while(UART0_S1 & (1u<<5))
	{
		return(UART0_D);
	}
}
void UART_OutChar(unsigned char data)
{
	while(!(UART0_S1 & (1u<<7)));
	UART0_D=data;
}
// iterative method
void UART_OutUDec(unsigned long n)
{
	unsigned cnt=0;
	unsigned char buffer[11];
	do
	{
		buffer[cnt] = n%10;// digit
		n = n/10;
		cnt++;
	}	while(n);// repeat until n==0
	do
	{
		UART_OutChar(buffer[cnt-1]+'0');
		cnt--;
	}while(cnt != 0);
}
int main()
{
	green();
	red();

	redon();
	redoff();
	greenon();
	greenoff();
	UART_Init();
	InitSYSTICK();
	sw1();
	sw2();

    char msg[len]="udit kr agarwal";
    while(1)
    {
    	if(sw2stat()==1)
    		{greenon();redoff();}
    	else
    		{greenoff();redon();}
    	if(sw1stat()==1)
    	{
    		for(int i=0;i<len;i++)
    			UART_OutChar(msg[i]);
    		//UART0_C2=UART0_C2|(1u<<0);
    		while(sw1stat()==1);
    	}

    }

	return 0;

}