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serial.c

Go to the documentation of this file.

#include <avr/io.h>
#include "serial.h"

#ifdef USE_STDIO

#include <stdio.h>

FILE *usb_fd;

FILE *xbee_fd;

#endif

void usb_init() {
  //Set baud rate
  // - 115200 (both wired and wireless) is UBRR=8, U2X=1
  // - 9600 is U2X =1, UBRR = 107.
#if (USB_BAUD == 115200)
  UBRR0H = 0x00;
  UBRR0L = 8;
  UCSR0A |= _BV(U2X0);
#elif (USB_BAUD == 9600)
  UBRR0H = 0x00;
  UBRR0L = 103;
  UCSR0A |= _BV(U2X0);
#else //Baud rate is defined in the header file, we should not get here
  return;
#endif

  /*Enable receiver and transmitter */
  UCSR0B |= (1<<RXEN0)|(1<<TXEN0);
        
  /* Set frame format: 8data, 1stop bit, asynchronous normal mode */
  UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01);
  
  // if we have enabled the stdio stuff, then we init it here
#ifdef USE_STDIO
  /* Open the stdio stream corresponding to this port */
  usb_fd = fdevopen(usb_putc, usb_getc);
#endif
}

void xbee_init() {
  //Set baud rate
  // - 115200 (both wired and wireless) is UBRR=8, U2X=1
  // - 9600 is U2X =1, UBRR = 107.
#if (XBEE_BAUD == 115200)
  UBRR1H = 0x00;
  UBRR1L = 8;
  UCSR1A |= _BV(U2X1);
#elif (XBEE_BAUD == 9600)
  UBRR1H = 0x00;
  UBRR1L = 103;
  UCSR1A |= _BV(U2X1);
#else //Baud rate is defined in the header file, we should not get here
  return;
#endif

  //Enable receiver and transmitter
  UCSR1B |= (1<<RXEN1)|(1<<TXEN1);
        
  // Set frame format: 8data, 1stop bit, asynchronous normal mode
  UCSR1C |= (1<<UCSZ10) | (1<<UCSZ11);
  
  // if we have enabled the stdio stuff, then we init it here
#ifdef USE_STDIO
  /* Open the stdio stream corresponding to this port */
  xbee_fd = fdevopen(xbee_putc, xbee_getc);
#endif
}

int usb_putc(char c) {
  // Wait until buffer is clear for sending
  loop_until_bit_is_set(UCSR0A, UDRE0);
        
  // Load buffer with your character
  UDR0 = c;
  return 0;
}

int xbee_putc(char c) {
  // Wait until buffer is clear for sending
  loop_until_bit_is_set(UCSR1A, UDRE1);
        
  // Load buffer with your character
  UDR1 = c;
  return 0;
}

int usb_puts(char *s) {
  char *t = s;
  while (*t != 0) {
    usb_putc(*t);
    t++;
  }
  return 0;
}

void usb_puts_P (PGM_P s) {
    char buf;
        
    while (memcpy_P (&buf, s, sizeof (char)), buf!=0) {
        usb_putc (buf);
        s++;
    }
}



int usb_getc(void) {
  // Wait for the receive buffer to be filled
  loop_until_bit_is_set(UCSR0A, RXC0);
        
  // Read the receive buffer
  return UDR0;
}

int xbee_getc(void) {
  // Wait for the receive buffer to be filled
  loop_until_bit_is_set(UCSR1A, RXC1);
        
  // Read the receive buffer
  return UDR1;
}

int usb_getc_nb(char *c) {
  // check if the receive buffer is filled
  if (UCSR0A & _BV(RXC0)) {
    // Read the receive buffer
    (*c) = UDR0;
    return 0;
  } else {
    // Return empty
    return -1;
  }
}

int xbee_getc_nb(char *c) {
  // check if the receive buffer is filled
  if (UCSR1A & _BV(RXC1)) {
    // Read the receive buffer
    (*c) = UDR1;
    return 0;
  } else {
    // Return empty
    return -1;
  }
}


/*
  prints an int to serial

  code adapted from Chris Efstathiou's code (hendrix@otenet.gr)
  uses usb_putc
*/
int usb_puti(int value ) {
  unsigned char usb_data[6]={'0','0','0','0','0','0' }, position=sizeof(usb_data), radix=10; 

  /* convert int to ascii  */ 
  if(value<0) { 
    usb_putc('-'); 
    value=-value; 
  }    
  do { 
    position--; 
    *(usb_data+position)=(value%radix)+'0'; 
    value/=radix;  
  } while(value); 

    
  /* start displaying the number */
  for(;position<=(sizeof(usb_data)-1);position++) {
            
    usb_putc(usb_data[position]);
  }

  return 0;
}

uint8_t hex_digit (uint8_t value)
{
    if (value>15) return '?';
    // Postcondition: 0<=x<=15

    return "0123456789ABCDEF"[value];
}

void usb_puth16 (uint16_t value)
{
    usb_putc (hex_digit((value >>12)&0xF));
    usb_putc (hex_digit((value >>8 )&0xF));
    usb_putc (hex_digit((value >>4 )&0xF));
    usb_putc (hex_digit( value      &0xF));
}

void usb_puth8(uint8_t value)
{
    usb_putc (hex_digit ((value)>>4 &0xF));
    usb_putc (hex_digit ( value     &0xF));
}

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