pic_serial.c File Reference

#include "config.h"
#include "pic_utils.h"
#include "pic_serial.h"
#include <string.h>
#include <stdlib.h>

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Functions

uns8 bin2Hex (uns8 x)
uns8 serial_getc (void)
 Retrieve a character from the serial port.
void serial_print_int (uns16 i)
 Print a 16 bit number to the serial port.
void serial_print_int_hex (uns8 i)
 Print an 8 bit number in hex to the serial port.
void serial_print_int_hex_16bit (uns16 i)
 Print a 16 bit number in hex to the serial port.
void serial_print_nl ()
 Print a newline.
void serial_print_spc ()
 Print a space.
void serial_print_str (rom char *str)
 Print a rom string out to the serial port.
void serial_print_str (char *str)
 Print a string out to the serial port.
void serial_putc (uns8 c)
 Transmit a single character.
uns8 serial_rx_avail ()
 Tests if the serial rx fifo has a character available.
void serial_rx_isr ()
 Serial receive interrupt service routine.
void serial_setup (bit req_brgh, uns8 req_spbrg)
 Configure the pic for serial communicaitons.
uns8 serial_tx_empty ()
 Tests if the serial tx fifo is empty.
void serial_tx_isr ()
 Serial transmit interrupt service routine.

Variables

uns8 rx_buffer [SERIAL_RX_BUFFER_SIZE]
uns8 rx_end = 0
uns8 rx_start = 0
uns8 tx_buffer [SERIAL_TX_BUFFER_SIZE]
uns8 tx_end = 0
uns8 tx_start = 0


Detailed Description

Definition in file pic_serial.c.


Function Documentation

uns8 bin2Hex ( uns8  x  )  [inline]

Definition at line 48 of file pic_serial.c.

Referenced by serial_print_int_hex().

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uns8 serial_getc ( void   ) 

Retrieve character from the serial port. Note that if there is nothing in the fifo, this function will wait until a character is received - and this will never happen if interrupts are turned off when this is called! So, be careful not to call getc during a critical section or during an ISR unless* you're sure there's something in the fifo. You can do this by calling the serial_rx_avail() routine. In any other situation, you can call getc() and happily wait for a character to arrive.

Definition at line 216 of file pic_serial.c.

References end_crit_sec, rx_buffer, rx_end, rx_start, start_crit_sec, and uns8.

void serial_print_int ( uns16  i  ) 

Print a 16 bit unsigned number in decimal to the serial port

Parameters:
i the 16 bit number to be printed

Definition at line 262 of file pic_serial.c.

References serial_putc(), and uns8.

Referenced by pkt_process_tx_queue(), pkt_queue_packet(), and pkt_send_payload().

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void serial_print_int_hex ( uns8  i  ) 

Print a 8 bit unsigned number in hex to the serial port

Parameters:
i 8 bit number to be printed

Definition at line 283 of file pic_serial.c.

References bin2Hex(), and serial_putc().

Referenced by i2c_write_eeprom(), pkt_print_packet(), and serial_print_int_hex_16bit().

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void serial_print_int_hex_16bit ( uns16  i  ) 

Print a 16 bit unsigned number in hex to the serial port

Parameters:
i 16 bit number to be printed

Definition at line 290 of file pic_serial.c.

References serial_print_int_hex().

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void serial_print_nl (  ) 

Print a new line out the serial port - if you do this often, this routine can be used to save a couple of instructions. Always helps!

Definition at line 301 of file pic_serial.c.

References serial_putc().

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void serial_print_spc (  ) 

Print a space out the serial port - if you do this often, this routine can be used to save a couple of instructions. Always helps!

Definition at line 296 of file pic_serial.c.

References serial_putc().

Referenced by i2c_write_eeprom(), pkt_print_packet(), and pkt_process_tx_queue().

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void serial_print_str ( rom char *  str  ) 

Send a null terminated rom string out the serial port

Parameters:
str the rom string to be sent

Definition at line 250 of file pic_serial.c.

References serial_putc(), and uns8.

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void serial_print_str ( char *  str  ) 

Send a null terminated string out the serial port

Parameters:
str the string to be sent

Definition at line 238 of file pic_serial.c.

References serial_putc(), and uns8.

Referenced by i2c_write_eeprom(), pkt_print_packet(), pkt_process_rf_data(), pkt_process_tx_queue(), pkt_queue_packet(), pkt_send_packet(), and pkt_send_payload().

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void serial_putc ( uns8  c  ) 

Sends a single character out the serial connection. It is sent straight out if possible, otherwise put into the fifo. Note that if you fill the fifo while interrupts are off (eg, in an interrupt routine or a critical section) then this routine will hang the pic, since it's waiting for an interrupt to clear the fifo, which never comes... The moral is to keep your fifo big enough or don't send too much while interrupts are off (eg, in an interrupt response routine). Of course, you *can* send things in an ISR - just don't fill the fifo up.

Parameters:
c the character to transmit

Definition at line 122 of file pic_serial.c.

References kill_interrupts, tx_buffer, tx_end, tx_start, and uns8.

Referenced by serial_print_int(), serial_print_int_hex(), serial_print_nl(), serial_print_spc(), and serial_print_str().

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uns8 serial_rx_avail (  ) 

Tests to see if the serial receive fifo has a character available. Useful to call before getc() if interrupts are not enabled in that section of code.

Returns:
true (non zero) if there are one or more characters waiting in the fifo queue, false (zero) otherwise

Definition at line 307 of file pic_serial.c.

References rx_end, and rx_start.

void serial_rx_isr (  ) 

This routine needs to be called from your interrupt() routine when the receive hardware interrupt occurs in order to put received bytes into the fifo buffer.

Definition at line 176 of file pic_serial.c.

References rx_buffer, rx_end, rx_start, and uns8.

void serial_setup ( bit  req_brgh,
uns8  req_spbrg 
)

Configures the pic and gets ready for interrupt-driven serial communications. Includes setting the tris bits appropriately, and getting the baud rate generator set up. After calling this you can immediately start sending and receiving bytes.

Parameters:
brgh refer to your pic documentation
spbrg refer to your pic documentation

Definition at line 58 of file pic_serial.c.

References kill_interrupts.

uns8 serial_tx_empty (  ) 

Tests to see if the serial transmit fifo is empty.

Returns:
true (non zero) if tx fifo is empty, false (zero) otherwise

Definition at line 308 of file pic_serial.c.

References tx_end, and tx_start.

void serial_tx_isr (  ) 

serial_load_tx

This routine needs to be called from your interrupt() routine when the transmit hardware interrupt occurs in order to send bytes that are waiting in the fifo buffer.

Definition at line 156 of file pic_serial.c.

References tx_buffer, tx_end, tx_start, and uns8.


Variable Documentation

uns8 rx_buffer[SERIAL_RX_BUFFER_SIZE]

Receive fifo

Definition at line 31 of file pic_serial.c.

Referenced by serial_getc(), and serial_rx_isr().

uns8 rx_end = 0

Receive fifo end point

Definition at line 35 of file pic_serial.c.

Referenced by serial_getc(), serial_rx_avail(), and serial_rx_isr().

uns8 rx_start = 0

Receive fifo start point

Definition at line 33 of file pic_serial.c.

Referenced by serial_getc(), serial_rx_avail(), and serial_rx_isr().

uns8 tx_buffer[SERIAL_TX_BUFFER_SIZE]

Transmit fifo

Definition at line 24 of file pic_serial.c.

Referenced by pkt_send_packet(), serial_putc(), and serial_tx_isr().

uns8 tx_end = 0

Transmit fifo end point

Definition at line 28 of file pic_serial.c.

Referenced by serial_putc(), serial_tx_empty(), and serial_tx_isr().

uns8 tx_start = 0

Transmit fifo start point

Definition at line 26 of file pic_serial.c.

Referenced by serial_putc(), serial_tx_empty(), and serial_tx_isr().


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