dbgu embedded

#include <stdint.h>
#include <stdbool.h>
#include "include/AT91SAM9263.h"

#define RXRDY AT91C_US_RXRDY  // (DBGU) RXRDY Interrupt
#define TXRDY AT91C_US_TXRDY   // (DBGU) TXRDY Interrupt
#define ENDRX AT91C_US_ENDRX // (DBGU) End of Receive Transfer Interrupt
#define ENDTX AT91C_US_ENDTX  // (DBGU) End of Transmit Interrupt
#define OVRE AT91C_US_OVRE // (DBGU) Overrun Interrupt
#define FRAME AT91C_US_FRAME  // (DBGU) Framing Error Interrupt
#define PARE AT91C_US_PARE // (DBGU) Parity Error Interrupt
#define TXEMPTY AT91C_US_TXEMPTY // (DBGU) TXEMPTY Interrupt
#define TXBUFE AT91C_US_TXBUFE  // (DBGU) TXBUFE Interrupt
#define RXBUFF AT91C_US_RXBUFF  // (DBGU) RXBUFF Interrupt
#define COMM_TX AT91C_US_COMM_TX // (DBGU) COMM_TX Interrupt
#define COMM_RX AT91C_US_COMM_RX  // (DBGU) COMM_RX Interrupt

#define RSTRX  AT91C_US_RSTRX // (DBGU) Reset Receiver
#define RSTTX AT91C_US_RSTTX// (DBGU) Reset Transmitter

#define RESET_REC (1<<2)
#define RESET_TRAN (1<<3)
#define ENABLE_REC (1<<4)
#define DISABLE_REC (1<<5)
#define ENABLE_TRAN (1<<6)
#define DISABLE_TRAN (1<<7)



#define PIOC_PDR AT91C_PIOC_PDR
#define PIOC_ASR AT91C_PIOC_ASR
#define RxD (1<<30)
#define TxD (1<<31)
#define CD (115200) //clock divisor

#define RXEN AT91C_US_RXEN
#define TXEN AT91C_US_TXEN

#define DBGU_THR (volatile unsigned int *) (0xFFFFEE1C)


static void Open_DBGU(void) {
    AT91C_BASE_DBGU->DBGU_IDR = (RXRDY | TXRDY | ENDRX | ENDTX | OVRE | FRAME | PARE | TXEMPTY | TXBUFE | RXBUFF | COMM_TX | COMM_RX ); //disable interrupts
    AT91C_BASE_DBGU->DBGU_CR = (RESET_REC | RESET_TRAN | DISABLE_REC | DISABLE_TRAN); // reset and turn off receiver and transmiter
    *PIOC_PDR = (RxD | TxD); //disable PIO from controlling the pins
    *PIOC_ASR = (RxD | TxD); //assign line to the peripherial function
    AT91C_BASE_DBGU->DBGU_BRGR = CD; //unit baud rate generator register
    AT91C_BASE_DBGU->DBGU_MR = (1<<11); //no parity and normal mode
    AT91C_BASE_DBGU->DBGU_CR = (ENABLE_REC | ENABLE_TRAN); //enable receiver and transmiter


}

void printChar(char buffer) {

    while( !( (*AT91C_DBGU_CSR) & (1<<1)) ) {}
    *DBGU_THR = buffer;
}

char readChar(char buffer) {

        while( ~(*AT91C_DBGU_CSR & RXRDY)  ){}
        buffer = (char)*AT91C_DBGU_RHR;

        return buffer;
}

void printAlphabet(void) {

    char lowerChar, upperChar;

    for(lowerChar = 'a' ; lowerChar <= 'z' ; lowerChar++) {
        printChar(lowerChar);
    }
    for(upperChar = 'A' ; upperChar <= 'Z'; upperChar++){
        printChar(upperChar);
    }

}

void printString(char* string) {

    int counter = 0;
    while(string[counter] != '\0') {
        printChar(string[counter]);
        counter++;
    }
}

int main(void) {

    Open_DBGU();
    printAlphabet();
    char* string = "Sentence to print";
    printString(string);


    //char letter =
}