fifo

#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include "include/AT91SAM9263.h"

//-------------------------DBGU_IDR-----------------------------------//
#define DISABLE_RXRDY_INTERRUPT AT91C_US_RXRDY
#define DISABLE_TXRDY_INTERRUPT AT91C_US_TXRDY
#define DISABLE_END_OF_RECIVE_TRANSFER_INPUT AT91C_US_ENDRX
#define DISBLE_END_OF_TRNASMIT_INTERRUPT AT91C_US_ENDTX
#define DISABLE_OVERRUN_INTERRUPT AT91C_US_OVRE
#define DISABLE_FRAMING_ERROR_INTERUPT AT91C_US_FRAME
#define DISABLE_PARITY_ERROR_INTERRUPT AT91C_US_PARE
#define DISABLE_TXEMPTY_INTERRUPT AT91C_US_TXEMPTY
#define DISABLE_TXBUFE_INTERRUPT AT91C_US_TXBUFE
#define DISABLE_RXBUFF_INTERUPT AT91C_US_RXBUFF
#define DISABLE_COMM_TX_INTERRUPT AT91C_US_COMM_TX //30
#define DISABLE_COMM_RX_INTERRUPT AT91C_US_COMM_RX //31
#define DISABLE_RECIVER AT91C_US_RXDIS
#define DISABLE_TRANSIMTER AT91C_US_TXDIS

#define CAPITAL_A_ASCII 65
#define LOWER_A_ASCII 97
#define CAPITAL_Z_ASCII 90
#define LOWER_Z_ASCII 122
#define MCK 100000000
#define CD 115200
#define BUFFERSIZE 0xF
#define ASCII_ENTER 10

typedef struct FIFO
{
  char buffer[BUFFERSIZE+1];
  unsigned int head;
  unsigned int tail;
}Fifo;

void fifoInit (struct FIFO *fifo)
{
  fifo->head = 0;
  fifo->tail = 0;
}

void fifoEmpty (struct FIFO *fifo)
{
  fifo->head = fifo->tail;
}

int fifoPut (struct FIFO *fifo, char data)
{
  if((fifo->tail - fifo->head) == 1 || (fifo->tail - fifo->head) == BUFFERSIZE)
  {
    return -1;
  }
  fifo->buffer[fifo->head] = data;
  fifo->head = (fifo->head + 1) & BUFFERSIZE; //return to the start of fifo
  return 1;
}

int fifoGet (struct FIFO *fifo, char *data)
{
  if(fifo->head != fifo->tail)
  {
    *data = fifo->buffer[fifo->tail];
    fifo->tail = (fifo->tail +1) & BUFFERSIZE;
    return 1;
  }
  else
  {
    return -1;
  }
}

void disableInterrupts(void)
{
  AT91C_BASE_DBGU->DBGU_IDR = (DISABLE_RXRDY_INTERRUPT|DISABLE_TXRDY_INTERRUPT|DISABLE_END_OF_RECIVE_TRANSFER_INPUT|DISBLE_END_OF_TRNASMIT_INTERRUPT|
                              DISABLE_OVERRUN_INTERRUPT|DISABLE_FRAMING_ERROR_INTERUPT|DISABLE_PARITY_ERROR_INTERRUPT|DISABLE_TXEMPTY_INTERRUPT|
                              DISABLE_TXBUFE_INTERRUPT|DISABLE_RXBUFF_INTERUPT|DISABLE_COMM_TX_INTERRUPT|DISABLE_COMM_RX_INTERRUPT); //desactivate debug interrupt
}

void configurePeripheralPorts(void)
{
  AT91C_BASE_PIOC->PIO_ASR |= AT91C_PIO_PC30; // debug receiver data RxD//Pio Periherial A select Register//reciver
  AT91C_BASE_PIOC->PIO_PDR |= AT91C_PIO_PC30; //PIO Disable Register

  AT91C_BASE_PIOC->PIO_ASR |= AT91C_PIO_PC31; //debug receiver data TXD //transmitter
  AT91C_BASE_PIOC->PIO_PDR |= AT91C_PIO_PC31;
}

void turnOffReciver(void)
{
  AT91C_BASE_DBGU->DBGU_CR |= AT91C_US_RSTRX; //reset and turn off/disable receiver
}

void turnOffTransmitter(void)
{
    AT91C_BASE_DBGU->DBGU_CR |= AT91C_US_RSTTX; // reset and turn off/disable treansmitter
}

void disabeReciver(void)
{
  AT91C_BASE_DBGU->DBGU_CR |= DISABLE_RECIVER; //reset and turn off/disable receiver
}

void disableTransmitter(void)
{
    AT91C_BASE_DBGU->DBGU_CR |= DISABLE_TRANSIMTER; // reset and disable treansmitter
}

void configureThroughput(void)
{
  AT91C_BASE_DBGU->DBGU_BRGR = MCK/(16*CD); // MCK mster CLock/ (CD //clock Divisor *16) //baud Rate Generator Register //speed of transmiition
}

void configureOperationMode(void)
{
    AT91C_BASE_DBGU->DBGU_MR = AT91C_US_CHMODE_NORMAL| AT91C_US_PAR_NONE ; // set nomral mode 14 15 bit 0 0 // set no parity
}

void turnOnReciver(void)
{
    AT91C_BASE_DBGU->DBGU_CR |= AT91C_US_RXEN;
}

void turnOnTransmitter(void)
{
  AT91C_BASE_DBGU->DBGU_CR |= AT91C_US_TXEN;
}

void dbguInit(void)
{
  disableInterrupts();
  turnOffReciver();
  turnOffTransmitter();
  disabeReciver();
  disableTransmitter();
  configurePeripheralPorts();
  configureThroughput();
  configureOperationMode();
  turnOnReciver();
  turnOnTransmitter();
}

bool isCapital(char letter)
{
  return (letter >= CAPITAL_A_ASCII && letter <= CAPITAL_Z_ASCII);
}

bool isLower(char letter)
{
  return (letter >= LOWER_A_ASCII  && letter <= LOWER_Z_ASCII );
}

char letterConversion(char letter)
{
  if(isCapital(letter))
  {
    return tolower(letter);
  }
  else if(isLower(letter))
  {
    return toupper(letter);
  }
  else
  {
    return letter;
  }
}

void dbguPrintAsciiFifo(struct FIFO * fifo, char *data)
{
  do
  {
    while(!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXRDY)){}; //wait until Tx buffer busy - checj TXRDY flag

    //CSR channel status regster //TXRDY Interrupt
    AT91C_BASE_DBGU->DBGU_THR = letterConversion(*data);//* data ;//letterConversion(buffer); //write a singel char to Transmitter Holding Register
  }   while(fifoGet(fifo,data)!=-1);
  fifoEmpty(fifo);
}

void printMessage(const char*StringToPrint)
{
  int iterrator = 0;
  while(StringToPrint[iterrator] != '\0')
  {
    while(!(AT91C_BASE_DBGU->DBGU_CSR & DISABLE_TXRDY_INTERRUPT)){}; //wait until Tx buffer busy - checj TXRDY flag
    //CSR channel status regster //TXRDY Interrupt
    AT91C_BASE_DBGU->DBGU_THR =StringToPrint[iterrator]; //write a singel char to Transmitter Holding Register
    iterrator++;
  }
}

char dbguReadAsciiFifo(struct FIFO * fifo, char *data)
{
    while(!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY)){};//data avaible
    char buffer = AT91C_BASE_DBGU->DBGU_RHR;
      if(buffer == ASCII_ENTER)
      {
         dbguPrintAsciiFifo(fifo,data);
      }
      else
      {
        if(fifoPut(fifo, AT91C_BASE_DBGU->DBGU_RHR)==-1)
        {
          printMessage("not");
          dbguPrintAsciiFifo(fifo,data);
        }
      }
}

void dbguPrintAscii(const char buffer)
{
    while(!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXRDY)){}; //wait until Tx buffer busy - check TXRDY flag
    //CSR channel status regster //TXRDY Interrupt
    AT91C_BASE_DBGU->DBGU_THR = letterConversion(buffer); //write a singel char to Transmitter Holding Register
}

void dbguPrintAsciiForAlphabet(const char buffer)
{
    while(!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXRDY)){}; //wait until Tx buffer busy - checj TXRDY flag
    //CSR channel status regster //TXRDY Interrupt
    AT91C_BASE_DBGU->DBGU_THR = buffer; //write a singel char to Transmitter Holding Register
}

char dbguReadAscii(char buffer)
{
    while(!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY)){};//data avaible
    buffer = AT91C_BASE_DBGU->DBGU_RHR;
    //return buffer;
}

void printChars()
{
  char upper;
  char lower;
  for(upper ='A'; upper<= 'Z';++upper)
  {
    dbguPrintAsciiForAlphabet(upper);
  }
  for (lower ='a'; lower<= 'z';++lower)
  {
    dbguPrintAsciiForAlphabet(lower);
  }
}


int main()
{
  struct FIFO * fifo;
  fifoInit(fifo);
  dbguInit();
  char newLine = '\n';
  printChars();
  dbguPrintAscii(newLine);
  char input2;

  char* text = "My String to print";
  dbguPrintAscii(newLine);
  dbguPrintAscii(newLine);
  printMessage(text);
  dbguPrintAscii(newLine);
  dbguPrintAscii(newLine);
  char input = 't';
  //input = letterConversion(input);
  dbguPrintAscii(input);
  dbguPrintAscii(newLine);
  char character [100];
  while(true)
  {
    dbguReadAsciiFifo(fifo, character);
    dbguPrintAscii(newLine);
  }
  return 0;
}