ezlink_modem_main.c

芯科rf资料

/*
** ============================================================================
**
** FILE
**  Id: EZLink_Modem_Main.c, v2.0
**
** DESCRIPTION
**  EZLink Modem Demo main file 
**
** COPYRIGHT
**  Copyright 2006 Integration Associates Inc.  All rights reserved.
**
** LIMITED USE LICENSE.  
**  By using this software, the user agrees to the terms of the 
**  following license.  If the user does not agree to these terms, 
**  then this software should be returned within 30 days and a full 
**  refund of the purchase price or license fee will provided.  
**  Integration Associates hereby grants a license to the user on the 
**  following terms and conditions:  The user may use, copy, modify, 
**  revise, translate, abridge, condense, expand, collect, compile, 
**  link, recast, distribute, transform or adapt this software solely 
**  in connection with the development of products incorporating 
**  integrated circuits sold by Integration Associates.  Any other use 
**  for any other purpose is expressly prohibited with the prior written 
**  consent of Integration Associates.
**
** Any copy or modification made must satisfy the following conditions:
** 
** 1. Both the copyright notice and this permission notice appear in all copies of the software, 
**    derivative works or modified versions, and any portions thereof, and that both notices 
**    appear in supporting documentation.
**
** 2. All copies of the software shall contain the following acknowledgement: "Portions of this 
**    software are used under license from Integration Associates Inc. and are copyrighted."
**
** 3  Neither the name of Integration Associates Inc. nor any of its subsidiaries may be used 
**    to endorse or promote products derived from this software without specific prior written 
**    permission.
**
** THIS SOFTWARE IS PROVIDED BY "AS IS" AND ALL WARRANTIES OF ANY KIND, INCLUDING THE IMPLIED 
** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE, ARE EXPRESSLY DISCLAIMED.  THE DEVELOPER 
** SHALL NOT BE LIABLE FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.  
** THIS SOFTWARE MAY NOT BE USED IN PRODUCTS INTENDED FOR USE IN IMPLANTATION OR OTHER DIRECT 
** LIFE SUPPORT APPLICATIONS WHERE MALFUNCTION MAY RESULT IN THE DIRECT PHYSICAL HARM OR INJURY 
** TO PERSONS.  ALL SUCH IS USE IS EXPRESSLY PROHIBITED.
**
** ============================================================================
*/

//processor definitions
#include <18F2520.h>
#fuses INTRC_IO,NOPROTECT,NOBROWNOUT,NOWDT,NOPUT,NOMCLR,NODEBUG,NOLVP,NOXINST,NOPBADEN
#use delay(clock=8000000)                                     // 8 MHz internal oscillator
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)                  // hw usart: 8bit/1 stop bit/no parity bit/no handshake/data rate: 9.6kbps
#use fast_io(a)
#use fast_io(b)
#use fast_io(c)

//==============================================================
//      Select the frequency band and the target device
//==============================================================
//#define  BAND_434
//#define  BAND_868
#define  BAND_915

#define  IA4421

//include files
#include "EZLink_Modem_main.h"
#include "EZLink_Modem_cmd.c"
#include <string.h>

//global variable
int8 enable_eewrite;

//==============================================================
//          Circular buffer handling
//==============================================================
char ReadBuffer (void)
  {
  char nextChar;
  if (BufChar)                                                  // if the buffer is NOT empty:
    {
    BufChar--;                                                  // decrement the buffer
    nextChar = CircBuf[o_ptr];                                  // get the next character
    if (++o_ptr == CIRCBUF_LEN) o_ptr = 0;                      // step to the next character
    return nextChar;
    }
  }


//==============================================================
// Interrupt routines
//==============================================================
#int_timer2
void MAIN_hardint(void)
  {
  ++swit_10ms;                                                  // 10ms sw it request
  }

#int_rda
void Serial_receive(void)                                       // RS232 receive
  {
  CircBuf[i_ptr] = getc();                                      // get new character
  if (++i_ptr == CIRCBUF_LEN) i_ptr = 0;                        // buffer is circular
  if (i_ptr == o_ptr)                                           // is the buffer full?
    {
    if (++o_ptr == CIRCBUF_LEN) o_ptr = 0;
    }
  else BufChar++;                                               // if not, inc Nr of characters
  rs232_timer = 1;                                              // restart rs232 rx timer
  }

//==============================================================
// RF settings
//==============================================================
int16 set_frq(int8 ch)
  {
  if( ch > FREQ_maxid )
  {
	ch = 0;
  }
  //save channel number into the EEPROM
  if( enable_eewrite == 1 )
  {
     write_eeprom(EE_rf_ch, ch);
  }
  return (0xA000 + FREQ_start + ((int16)ch * FREQ_step));
  }

int16 set_tx(int8 dev, int8 pwr)                                   // set deviation (15 ... 240kHz) and relative output power: 0..7
  {
  if(dev < 15) dev = 15;
  if( enable_eewrite == 1 )
     write_eeprom(EE_rf_dev, dev);
  if(pwr > 7) pwr = 7;
  if( enable_eewrite == 1 )
     write_eeprom(EE_rf_pwr, pwr);
  if(dev == 255) dev = 90;
  dev = dev / 15 - 1;
  return(0x9800 + dev * 0x10 + 7 - pwr);
  }

int16 set_dr(int16 dr)                                             // set data rate (up to 32kbps)
  {
  int16 r;
  if(dr == 65535) dr = 9600;
  if(dr > 32000) dr = 32000;
  if( enable_eewrite == 1 )
   {
   write_eeprom(EE_rf_dr, dr);                                   // save the lower byte
   write_eeprom(EE_rf_dr + 1, dr >> 8);                          // save the high byte to the next location
   }
  if(dr < 2700)
    {
    dr *= 8;
    dr /= 100;
    r = (3448 + dr / 2) / dr - 1;
    return(0xC680 + r);
    }
  else
    {
    dr /= 100;
    r = (3448 + dr / 2) / dr - 1;
    return(0xC600 + r);
    }
  }

//==============================================================
// SPI interface functions
//==============================================================
// SPI interface read                                           // read spidata from SPI
//--------------------------------------------------------------
int8 spi_read_sw(void)
  {
  int8 i, spidata;
  output_low(SPI_SDO);
  output_low(SPI_SCK);
  for (i=0;i<8;i=i+1)
    {
    shift_left(&spidata, 1, input(SPI_SDI));
    output_high(SPI_SCK);
    output_low(SPI_SCK);
    }
  return(spidata);
  }

// SPI interface write                                          // send spidata via SPI
//--------------------------------------------------------------
void spi_write_sw(int16 spidata)
  {
  int8 i;
  output_low(SPI_SDO);
  output_low(SPI_SCK);
  for (i=0;i<8;i=i+1)
    {
    output_bit(SPI_SDO, shift_left(&spidata, 1, 0));
    output_high(SPI_SCK);
    output_low(SPI_SCK);
    }
  output_low(SPI_SDO);
  }

// Send SPI command to the rf chip                              // send 16-bit SPI command with NSEL control
//--------------------------------------------------------------
void send_cmd(int16 spicmd)
  {
  output_low(NSEL);
  spi_write_sw(spicmd >> 8);
  spi_write_sw(spicmd);
  output_high(NSEL);
  }

//==============================================================
// initialization
//==============================================================
void MAIN_init(void)
  {
  int16 dr;
//---- PIC init ------------------------------------------------
  setup_oscillator(OSC_8MHZ | OSC_INTRC);
  setup_comparator(NC_NC_NC_NC);
  setup_CCP1(CCP_OFF);
  setup_CCP2(CCP_OFF);
  #ifdef IA4421
   setup_ADC_PORTS(AN0); 		                                // AN0(PIN_A0): ARSSI
  #endif
  set_tris_a(0x03);		//inputs: ARSSI; VDI
  set_tris_b(0x0d);		//inputs: FFIT, NIRQ, SDO
  set_tris_c(0x8b);		//inputs: T1OSO, T1OSI, UART_RX

  setup_timer_2(T2_DIV_BY_4, 250, 10);                          // 10ms hardware interrupt (@4MHz)
  enable_interrupts(INT_TIMER2);
  enable_interrupts(INT_RDA);
  enable_interrupts(GLOBAL);

  enable_eewrite = 1;

  output_high(NSEL);                                            // nSEL inactive
  output_high(NFFS);                                            // nFFS inactive
  output_low(SPI_SDO);                                          // set SPI to default state
  output_low(SPI_SCK);                                          // set SPI to default state

  output_high(TLED);                                            // Blink LEDs on starup
  delay_ms(50);
  output_high(RLED);
  delay_ms(50);
  output_low(TLED);
  delay_ms(50);
  output_low(RLED);

  opmode = 0;                                                   // default mode: data (1: command mode)
  swit_10ms = 0;
  i_ptr = 0;
  o_ptr = 0;
  BufChar = 0;
  RxPacketLen = 0;
  RxPacketPtr = 0;
  rs232_timer = 0;
  rs232_timeout = 200;                                          // RS232 rx timeout = 1s
  rs232_EOP = 13;                                               // RS232 EOP char = <CR>