315 lines
9.7 KiB
C
315 lines
9.7 KiB
C
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/* The software in this file is based on code from FU Berlin. */
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/*
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Copyright 2003/2004, Freie Universitaet Berlin. All rights reserved.
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These sources were developed at the Freie Universität Berlin, Computer
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Systems and Telematics group.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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This software is provided by FUB and the contributors on an "as is"
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basis, without any representations or warranties of any kind, express
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or implied including, but not limited to, representations or
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warranties of non-infringement, merchantability or fitness for a
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particular purpose. In no event shall FUB or contributors be liable
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for any direct, indirect, incidental, special, exemplary, or
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consequential damages (including, but not limited to, procurement of
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substitute goods or services; loss of use, data, or profits; or
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business interruption) however caused and on any theory of liability,
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whether in contract, strict liability, or tort (including negligence
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or otherwise) arising in any way out of the use of this software, even
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if advised of the possibility of such damage.
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This implementation was developed by the CST group at the FUB.
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Contributors: Thomas Pietsch, Bjoern Lichtblau
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*/
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/* \file recir.c
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** \ingroup Firmware
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** \brief Receiving RC5 via IR Receiving Diode.
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**
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** \code
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** RC5: 1780 us bitlength (manchester encoded, so half bitlength of 890 us is important)
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** Transferred packet (2 start + toggle bit + 5 address bits + 6 comand bits)):
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** | S | S | T | A4 | A3 | A2 | A1 | A0 | C5 | C4 | C3 | C2 | C1 | C0 |
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** irdata format: | ? | ? | error | newData | T | A4 | A3 | A2 | A1 | A0 | C5 | C4 | C3 | C2 | C1 | C0 |
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** \endcode
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**
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** <img src="../pics/rc5.jpg">
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** See detailed description at <a href="http://users.pandora.be/davshomepage/rc5.htm">http://users.pandora.be/davshomepage/rc5.htm</a>
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**
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** Some common addresses and commands:
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** \code
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** Address: Device: Command:
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** 0 TV1 0...9 Numbers 0...9 (channel select)
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** 1 TV2 12 Standby
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** 5 VCR1 16 Master Volume +
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** 6 VCR2 17 Master Volume -
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** 17 Tuner 18 Brightness +
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** 18 Audio Tape 19 Brightness -
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** 20 CD Player 50 Fast rewind
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** 52 Fast run forward
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** 53 Play
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** 54 Stop
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** 55 Recording
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** \endcode
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**/
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#include "contiki.h"
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#include "dev/ir.h"
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#include "dev/leds.h"
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#include "dev/beep.h"
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PROCESS(ir_process, "IR receiver");
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process_event_t ir_event_received;
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/*---------------------------------------------------------------------------*/
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#define SIR1 (P1OUT |= 0x01) ///< MACRO: Puts IR sending diode high.
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#define SIR0 (P1OUT &= 0xFE) ///< MACRO: Puts IR sending diode low.
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#define BIT75 3282 ///< 3 quarters of a bit after start, 3282 cyc @ 2,4576Mhz = 1335us.
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#define BIT50 2188 ///< Half of bit length, 2188 cyc @ 2,4576Mhz = 890 us.
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/*---------------------------------------------------------------------------*/
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/* Sends a logical one via IR, method is timed for the 2.4576Mhz SMCLK!!!
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*/
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static volatile void
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send1bit(void)
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{
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volatile int i;
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for(i = 0; i < 34; ++i) {
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SIR1; SIR1; SIR1; SIR1;
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SIR0; SIR0; SIR0; SIR0;
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SIR0; SIR0; SIR0; SIR0;
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SIR0;
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}
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}
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/*---------------------------------------------------------------------------*/
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/* Sends a logical 0 via IR, method is timed for the 2.4576Mhz SMCLK!!!
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*/
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static volatile void
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send0bit(void)
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{
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volatile int i;
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for(i = 0; i < 34; ++i) {
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SIR0; SIR0; SIR0; SIR0;
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SIR0; SIR0; SIR0; SIR0;
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SIR0; SIR0; SIR0; SIR0;
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SIR0;
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}
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}
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/*---------------------------------------------------------------------------*/
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/* Sends the lower 12 bits of data via IR, turns interrupt off while
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it's sending.
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*/
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void
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ir_send(unsigned short data)
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{
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volatile unsigned short mask = 0x2000;
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data |= 0xF000;
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dint();
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while(mask != 0){
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if(!(mask & data)){
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send1bit();
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send0bit();
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} else {
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send0bit();
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send1bit();
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}
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mask /= 2;
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}
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eint();
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}
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/*---------------------------------------------------------------------------*/
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/* Testroutine which repetedly sends two commands.
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*/
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/*void
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ir_test_send(void)
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{
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volatile unsigned int i;
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send12bits(0xF010);
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for(i=0; i<0xFFFF; i++) nop();
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send12bits(0xF011);
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for(i=0; i<0xFFFF; i++) nop();
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}*/
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/*---------------------------------------------------------------------------*/
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static void setErrorBit(void);
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static void clearErrorBit(void);
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static void setDataAvailableBit(void);
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static void clearDataAvailableBit(void);
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/// \name Internal variables.
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//@{
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static unsigned int ir_pos; ///< current position in frame
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static unsigned int recvdata; ///< here a received packet is saved
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static unsigned int recvdatabuffer; ///< temporary buffer for receiving
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static unsigned char ir_temp; ///< saves the first half of the manchester bit
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//@}
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/// \name Public functions.
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/// If ::recir_dataAvailable()==1 use the get* functions.
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//@{
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unsigned char recir_getCode(void){ return (recvdata & 0x003F); }
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unsigned char recir_getAddress(void){ return ((recvdata & 0x07C0) >> 6); }
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unsigned char recir_getToggle(void){ return ((recvdata & 0x0800) >> 11); }
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unsigned char recir_getError(void){ return ((recvdata & 0x2000) >> 13); }
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u16_t
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ir_data(void)
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{
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return recvdata;
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}
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u8_t
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ir_poll(void)
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{
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if(recvdata & 0x1000) {
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clearDataAvailableBit();
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return 1;
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} else {
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return 0;
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}
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}
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///\name Internal functions.
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//@{
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static void setErrorBit(void){ recvdata |= 0x2000; }
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static void clearErrorBit(void) { recvdata &= 0xDFFF; }
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static void setDataAvailableBit(void){ recvdata |= 0x1000; }
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static void clearDataAvailableBit(void){ recvdata &= 0xEFFF; }
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/// Timer B0 interrupt service routine
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interrupt(TIMERB1_VECTOR) Timer_B1 (void) {
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/*P2OUT = (P2OUT & 0xf7) | (8 - (P2OUT & 0x08));*/
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if(ir_pos <= 25) {
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if(ir_pos % 2) { // odd position
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if(ir_temp && !(P1IN & 0x04)) { // 1 - 0 --> write 1
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recvdatabuffer +=1;
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recvdatabuffer = recvdatabuffer << 1;
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} else if(!ir_temp && (P1IN & 0x04)) { // 0 - 1 --> write 0
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recvdatabuffer = recvdatabuffer << 1;
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} else {
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setErrorBit();
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if(P1IN & 0x04) {
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recvdatabuffer += 1;
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}
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recvdatabuffer = recvdatabuffer << 1;
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}
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} else { // even position
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ir_temp = P1IN & 0x04;
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}
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}
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if(ir_pos == 25) { // end reached
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recvdatabuffer = recvdatabuffer >> 1;
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if(!recir_getError() && ( (recvdatabuffer & 0x0FFF) != (recvdata & 0x0FFF) ) ){
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recvdata = recvdatabuffer;
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setDataAvailableBit();
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} else {
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_NOP();
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}
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}
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if(ir_pos==27) {
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TBCCTL1 &= ~CCIE;
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//GREENOFF;
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// temporary debug output
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//sendRS232Address(recvdatabuffer);
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//if(recir_getError()) sendRS232('E');
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//sendRS232String("\r\n");
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if(!recir_getError()) beep_beep(20);
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// reenable interrupt for falling edge
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P1IFG &= ~(0x04);
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P1IE |= 0x04; // enable interrupt for recir RC5
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leds_off(LEDS_RED);
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}
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ir_pos++;
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TBCCR1 += BIT50; // set new interrupt
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TBCCTL1 &= ~CCIFG;
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}
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/** \brief IR Interrupt routine
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**
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** For the falling edge (start of RC5 packet)( mid of first start bit ), IRReceiver is on P12
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** real interrupt routine, which calls this, is in sensors.c */
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void
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ir_irq(void)
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{
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if(P1IN & 0x04) return; // high again, just a peak
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ir_pos = 0;
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recvdatabuffer = 0;
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clearErrorBit();
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// the first timer interrupt will occur in the mid of the first half of the second start bit
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TBCCR1 = TBR + BIT75; // set first TBCCR1 IRQ to 75% of RC5 bitlength
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TBCCTL1 &= ~CCIFG; // clear previous compare flag
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TBCCTL1 |= CCIE; // CCR0 interrupt enabled, interrupt occurs when timer equals CCR0
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P1IE &= ~0x04; // disable interrupt for P12 ( ReceiveIR )
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leds_on(LEDS_RED);
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//GREENON;
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}
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//@}
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/*---------------------------------------------------------------------*/
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PROCESS_THREAD(ir_process, ev, data)
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{
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PROCESS_BEGIN();
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// init TIMERB ccr0 to run continouslycreate the 5 ms interval
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// ccr1 is used for ir receiving (RC5)
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TBCTL = TBSSEL1 + TBCLR; // select SMCLK (2.4576MHz), clear TBR
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TBCTL |= MC1; // Start Timer_A in continuous mode
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P1IES |= 0x04; // Important for IR-RC5 receive to detect the first FALLING edge
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ir_event_received = process_alloc_event();
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_POLL);
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if(ir_poll() == IR_DATA) {
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unsigned short irdata;
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irdata = ir_data() & 0x7ff;
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process_post(PROCESS_BROADCAST, ir_event_received, (process_data_t)irdata);
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------*/
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