/**
* IR receiver and transmitter driver.
*
* @date 2006-12-10
*
* @author Anders Runeson, Andreas Fritiofson
*
*/
/*-----------------------------------------------------------------------------
* Includes
*---------------------------------------------------------------------------*/
#include <config.h>
#include <drivers/mcu/pcint.h>
#include <drivers/mcu/gpio.h>
#include <drivers/ir/transceiver/irtransceiverMulti.h>
#include <drivers/ir/protocols.h>
#include <avr/io.h>
#include <avr/interrupt.h>
/*-----------------------------------------------------------------------------
* Globals
*---------------------------------------------------------------------------*/
#if IR_RX_ENABLE==1
struct {
uint8_t enable;
uint16_t timeout;
uint8_t timeoutEnable;
uint16_t *rxbuf;
uint8_t rxlen;
uint8_t storeEnable;
irCallback_t callback;
} drvIrRxChannel[3];
#endif
#if IR_TX_ENABLE==1
uint16_t *txbuf;
uint8_t txlen;
static uint8_t bufIndex; //selects the pulse width in buffer to send
volatile uint8_t data_transmitted;
#endif
/*-----------------------------------------------------------------------------
* Prerequisites
*---------------------------------------------------------------------------*/
#ifndef IR_RX_ACTIVE_LOW
#define IR_RX_ACTIVE_LOW 1
#endif
#ifndef IR_TX_ACTIVE_LOW
#define IR_TX_ACTIVE_LOW 0
#endif
#ifndef IR_TX_ENABLE
#define IR_TX_ENABLE 0
#endif
#ifndef IR_RX_ENABLE
#define IR_RX_ENABLE 0
#endif
#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega16__) || defined(__AVR_ATmega32__)
#define TIMSK1 TIMSK
#define TIFR1 TIFR
#define ICIE1 TICIE1
#endif
#define IR_COMPARE_VECTOR TIMER1_COMPB_vect
#define IR_TIMEOUT_VECTOR TIMER1_COMPA_vect
#define IR_CAPTURE_VECTOR TIMER1_CAPT_vect
#define IR_TIMEOUT_REG OCR1A
#define IR_COMPARE_REG OCR1B
#define IR_CAPTURE_REG ICR1
#define IR_COUNT_REG TCNT1
#define IR_MODULATION_REG OCR0A
/*#define IR_TIMER_INIT() TCCR1A = 0; \
TCCR1B = (1<<ICNC1)|(2<<CS10);
*/
#define IR_TIMER_INIT() TCCR1A = 0; \
TCCR1B = (2<<CS10);
#define IR_MASK_COMPARE() TIMSK1 &= ~(1<<OCIE1B);
#define IR_UNMASK_COMPARE() TIFR1 = (1<<OCF1B); TIMSK1 |= (1<<OCIE1B);
#define IR_MASK_TIMEOUT() TIMSK1 &= ~(1<<OCIE1A);
#define IR_UNMASK_TIMEOUT() TIFR1 = (1<<OCF1A); TIMSK1 |= (1<<OCIE1A);
#define IR_MASK_CAPTURE() TIMSK1 &= ~(1<<ICIE1);
#define IR_UNMASK_CAPTURE() TIFR1 = (1<<ICF1); TIMSK1 |= (1<<ICIE1);
#define IR_CAPTURE_FALLING() TCCR1B &= ~(1<<ICES1); \
TIFR1 = (1<<ICF1);
#define IR_CAPTURE_RISING() TCCR1B |= (1<<ICES1); \
TIFR1 = (1<<ICF1);
#define IR_OUTP_HIGH() TCCR0A |= (1<<COM0A0);
#define IR_OUTP_LOW() TCCR0A &= ~(1<<COM0A0);
/*-----------------------------------------------------------------------------
* Interrupt Handlers
*---------------------------------------------------------------------------*/
/*
timer 1 has two comprare registers and compare ISRs, one is used below for "timeout" on receive and the other is used here for transmitter
//TODO: how to handle more than one transmitter on one compare interrupt, spara en array med tider och nån enableflagga för varje kanal
*/
#if IR_TX_ENABLE==1
ISR(IR_COMPARE_VECTOR)
{
if ((bufIndex&1) == 1) { /* if odd, ir-pause */
IR_OUTP_LOW();
} else {
IR_OUTP_HIGH();
}
//The following three lines is just to allow a start signal to be zero.
/* bufIndex++;
while (txbuf[bufIndex] == 0){
bufIndex++;
}*/
if (bufIndex < txlen)
{
IR_COMPARE_REG += txbuf[bufIndex++];
//IR_COMPARE_REG += *(txbuf + bufIndex++);
}
else
{
IR_MASK_COMPARE();
data_transmitted = 1;
}
}
#endif
#if IR_RX_ENABLE==1
//TODO: hur hantera detta i multi receiver
//TODO: ha en array med tider och nån enableflagga för varje kanal
//TODO: mot slutet av ISRen laddas nästa tid in...
/* When this timeout occurs a pulsetrain is complete */
ISR(IR_TIMEOUT_VECTOR)
{
/* Find which channel timed out */
uint16_t timeDiff = 0xffff;
uint8_t channel = 0;
/* for (uint8_t i=0; i < 3; i++)
{
if ((drvIrRxChannel[channel].timeoutEnable==TRUE) && (IR_TIMEOUT_REG-drvIrRxChannel[i].timeout < timeDiff))
{
timeDiff = IR_TIMEOUT_REG-drvIrRxChannel[i].timeout;
channel = i;
}
}
*/
/* If more than 3 flanks was recevied */
if (drvIrRxChannel[channel].rxlen > 3)
{
/* Notify the application that a pulse train has been received. */
drvIrRxChannel[channel].callback(channel, drvIrRxChannel[channel].rxbuf, drvIrRxChannel[channel].rxlen);
}
drvIrRxChannel[channel].storeEnable = FALSE;
drvIrRxChannel[channel].timeoutEnable = FALSE;
IR_MASK_TIMEOUT();
//TODO: reset the timeout for next enabled channel
/*
uint16_t nextTimeout = drvIrRxChannel[channel].timeout;
for (uint8_t i=0; i < 3; i++)
{
//TODO: hitta den med timeout härnäst (svårt med tanke på att den tiden kan ha passerat eftersom vi är under interrupt)
//kanske inte är så noga, i värsta fall tar det 65ms extra
if ((drvIrRxChannel[channel].timeoutEnable) && (drvIrRxChannel[i].timeout < nextTimeout))
{
nextTimeout = drvIrRxChannel[i].timeout;
}
}
IR_UNMASK_TIMEOUT();
IR_TIMEOUT_REG = nextTimeout;
*/
}
#endif
/*-----------------------------------------------------------------------------
* Private Functions
*---------------------------------------------------------------------------*/
#if IR_RX_ENABLE==1
/* these wrapper functions are called from the pcint driver (callback) */
void IrTransceiver_Store_ch0(uint8_t id, uint8_t status)
{
IrTransceiver_Store(0);
}
void IrTransceiver_Store_ch1(uint8_t id, uint8_t status)
{
IrTransceiver_Store(1);
}
void IrTransceiver_Store_ch2(uint8_t id, uint8_t status)
{
IrTransceiver_Store(2);
}
void IrTransceiver_Store(uint8_t channel)
{
static uint16_t prev_time[3];
uint16_t pulsewidth;
/* Read the timer counter register to get the current "time". */
uint16_t time = IR_COUNT_REG
;
/* Subtract the current measurement from the previous to get the pulse width. */
pulsewidth
= time - prev_time
[channel
]; prev_time
[channel
] = time;
if (drvIrRxChannel[channel].storeEnable)
{
/* Store the measurement. */
drvIrRxChannel[channel].rxbuf[drvIrRxChannel[channel].rxlen++] = pulsewidth;
/* Disable future measurements if we've filled the buffer. */
//TODO: What to do in multi recevier?
//TODO: Report overflow to application
if (drvIrRxChannel[channel].rxlen == MAX_NR_TIMES)
{
drvIrRxChannel[channel].rxlen = MAX_NR_TIMES-1;
}
}
else if (drvIrRxChannel[channel].enable == TRUE)
{
/* The first edge of the pulse train has been detected. Enable the storage of the following pulsewidths. */
drvIrRxChannel[channel].storeEnable = TRUE;
drvIrRxChannel[channel].rxlen = 0;
drvIrRxChannel[channel].timeoutEnable = TRUE;
/* Set the timeout for detection of the end of the pulse train. */
drvIrRxChannel
[channel
].
timeout = time + IR_MAX_PULSE_WIDTH
; uint16_t nextTimeout = drvIrRxChannel[channel].timeout;
for (uint8_t i=0; i < 3; i++)
{
//TODO: hitta den med timeout härnäst (svårt med tanke på att den tiden kan ha passerat eftersom vi är under interrupt)
//kanske inte är så noga, i värsta fall tar det 65ms extra
if ((drvIrRxChannel[channel].timeoutEnable) && (drvIrRxChannel[i].timeout < nextTimeout))
{
nextTimeout = drvIrRxChannel[i].timeout;
}
}
IR_TIMEOUT_REG = nextTimeout;
/* Enable timeout interrupt for detection of the end of the pulse train. */
IR_UNMASK_TIMEOUT();
//TODO: if buffer resource coordinator is implemented this is where a buffer should be assinged to this channel
}
}
#endif
/*-----------------------------------------------------------------------------
* Public Functions
*---------------------------------------------------------------------------*/
/* call this function like this:
IrTransceiver_Init_TX_Channel(channelnumber, buffer, callback, pcint-id, GPIO_D6);
buffer is a memory location
callback is a function to call when a receive/transmitt is complete
also call with IO port to use
*/
#if IR_RX_ENABLE==1
void IrTransceiver_Init_TX_Channel(uint8_t channel, uint16_t *buffer, irCallback_t callback, uint8_t pcint_id, volatile uint8_t* port, volatile uint8_t* pin, volatile uint8_t* ddr,uint8_t nr, uint8_t pcint)
{
if (channel == 0)
{
Pcint_SetCallback(pcint_id, pcint, &IrTransceiver_Store_ch0);
}
else if (channel == 1)
{
Pcint_SetCallback(pcint_id, pcint, &IrTransceiver_Store_ch1);
}
else if (channel == 2)
{
Pcint_SetCallback(pcint_id, pcint, &IrTransceiver_Store_ch2);
}
if (channel < 3)
{
/* Set port direction to input */
*ddr &= ~(1 << nr);
drvIrRxChannel[channel].rxbuf = buffer;
drvIrRxChannel[channel].rxlen = 0;
drvIrRxChannel[channel].storeEnable = FALSE;
drvIrRxChannel[channel].timeoutEnable = FALSE;
drvIrRxChannel[channel].callback = callback;
drvIrRxChannel[channel].enable = TRUE;
}
}
/* call this function like this:
IrTransceiver_DeInit_TX_Channel(channelnumber, pcint-id, GPIO_D6);
*/
void IrTransceiver_DeInit_TX_Channel(uint8_t channel, uint8_t pcint_id, volatile uint8_t* port, volatile uint8_t* pin, volatile uint8_t* ddr,uint8_t nr, uint8_t pcint)
{
/* Deactivate interrupt */
Pcint_SetCallback(pcint_id, pcint, 0);
if (channel < 3)
{
/* Deactivate channel */
drvIrRxChannel[channel].enable = FALSE;
drvIrRxChannel[channel].rxlen = 0;
drvIrRxChannel[channel].storeEnable = FALSE;
drvIrRxChannel[channel].timeoutEnable = FALSE;
drvIrRxChannel[channel].callback = 0;
}
}
uint8_t IrTransceiver_GetStoreEnable(uint8_t channel)
{
return drvIrRxChannel[channel].storeEnable;
}
void IrTransceiver_Disable(uint8_t channel)
{
if (channel < 3)
{
/* Soft disable channel */
drvIrRxChannel[channel].enable = FALSE;
}
}
void IrTransceiver_Enable(uint8_t channel)
{
if (channel < 3)
{
/* Soft enable channel */
drvIrRxChannel[channel].enable = TRUE;
}
}
void IrTransceiver_Reset(uint8_t channel)
{
if (channel < 3)
{
/* Reset channel */
drvIrRxChannel[channel].rxlen = 0;
drvIrRxChannel[channel].storeEnable = FALSE;
drvIrRxChannel[channel].timeoutEnable = FALSE;
}
}
#endif
/*
void IrTransceiver_Init_RX_Channel(uint8_t channel, uint16_t *buffer, irCallback_t callback, volatile uint8_t* port, volatile uint8_t* pin, volatile uint8_t* ddr,uint8_t nr, uint8_t pcint)
{
}
*/
void IrTransceiver_Init(void)
{
for (uint8_t i = 0; i < 3; i++)
{
drvIrRxChannel[i].storeEnable = FALSE;
drvIrRxChannel[i].timeoutEnable = FALSE;
drvIrRxChannel[i].rxlen = 0;
}
IR_TIMER_INIT();
#if IR_TX_ENABLE==1
/* Set up transmitter */
IR_T_DDR |= (1<<IR_T_BIT);
#if defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
TCCR0A = (0<<COM0A1)|(0<<COM0A0)|(1<<WGM01)|(0<<WGM00);
TCCR0B = (0<<WGM02)|(1<<CS00)|(0<<CS01)|(0<<CS02);
#endif
#if IR_TX_ACTIVE_LOW==1
/* when pwm is disconnected from port (during low) the port should output 5V */
IR_T_PORT |= (1<<IR_T_BIT);
#else
/* when pwm is disconnected from port (during low) the port should output 0V */
IR_T_PORT &= ~(1<<IR_T_BIT);
#endif
#endif
}
uint8_t IrTransceiver_Transmit_Poll(void) {
#if IR_TX_ENABLE==1
if (data_transmitted == 0) {
return IR_NOT_FINISHED;
} else {
return IR_OK;
}
#else
return 0;
#endif
}
uint8_t IrTransceiver_Transmit(uint16_t *buffer, uint8_t length, uint8_t modfreq)
{
#if IR_TX_ENABLE==1
data_transmitted = 0;
if (length == 0) return IR_NO_DATA;
txbuf = buffer;
txlen = length;
bufIndex = 1;
IR_MODULATION_REG = modfreq;
IR_COMPARE_REG = IR_COUNT_REG + txbuf[0];
IR_OUTP_HIGH();
IR_UNMASK_COMPARE();
//while (!data_transmitted);
return IR_OK;
#else
return 0;
#endif
}