Hello Teensy community,
I'm a happy user of Teensy 2.0, and used it in numerous hobby project and protoyping fo job. I've also backed T3 on kickstarter.
Finally, a forum just for Teensy.
What I want is using the IRRemote Lib to send IR signals and I also want to transmit serial data with AltSerial Library.
By the way:
I didn't managed to successfully receive data with the NewSoftSerial or the SoftwareSerial library.
The test code was something like:
1) if USB (CDC) data received, transmit with Hardware Serial (9600 baud) (wich is connected by wire to the SoftSerial input).
2) Check if softserial received and transmit back to USB.
With AltSerial it works great.
I'm using Arduino 1.01.
The problem is that both library use the same pin 10 (one transmit IR signal the other as Serial Rx).
After closer inspection it appear that one uses the timer 4 and the other timer3.
It's probably because this pin is also ICP3 (Input capture 3) and OC4A (output compare 4).
My main question is : How can I resolve this conflict ?
For example : what should I modify to use OC4B pin instead of OC4A pin ? Or use another Capture Input for serial RX ?
I've worked with several MCU in the past years. Teensy as introduced me to AVR architecture and Arduino IDE.
Here are the registry configuration for both library :
IrRemoteInt.h
known_boards.h (AltSerial)
known_timer.h
I won't send IR and serial TX simultaneously, one sending at a time, my last option will be to add additional hardware demultiplexer in the circuit.
Can this last option work ?
I'm a happy user of Teensy 2.0, and used it in numerous hobby project and protoyping fo job. I've also backed T3 on kickstarter.
Finally, a forum just for Teensy.
What I want is using the IRRemote Lib to send IR signals and I also want to transmit serial data with AltSerial Library.
By the way:
I didn't managed to successfully receive data with the NewSoftSerial or the SoftwareSerial library.
The test code was something like:
1) if USB (CDC) data received, transmit with Hardware Serial (9600 baud) (wich is connected by wire to the SoftSerial input).
2) Check if softserial received and transmit back to USB.
With AltSerial it works great.
I'm using Arduino 1.01.
The problem is that both library use the same pin 10 (one transmit IR signal the other as Serial Rx).
After closer inspection it appear that one uses the timer 4 and the other timer3.
It's probably because this pin is also ICP3 (Input capture 3) and OC4A (output compare 4).
My main question is : How can I resolve this conflict ?
For example : what should I modify to use OC4B pin instead of OC4A pin ? Or use another Capture Input for serial RX ?
I've worked with several MCU in the past years. Teensy as introduced me to AVR architecture and Arduino IDE.
Here are the registry configuration for both library :
IrRemoteInt.h
Code:
// Teensy 2.0
#elif defined(__AVR_ATmega32U4__)
//#define IR_USE_TIMER1 // tx = pin 14
//#define IR_USE_TIMER3 // tx = pin 9
#define IR_USE_TIMER4_HS // tx = pin 10
....
// defines for timer4 (10 bits, high speed option)
#elif defined(IR_USE_TIMER4_HS)
#define TIMER_RESET
#define TIMER_ENABLE_PWM (TCCR4A |= _BV(COM4A1))
#define TIMER_DISABLE_PWM (TCCR4A &= ~(_BV(COM4A1)))
#define TIMER_ENABLE_INTR (TIMSK4 = _BV(TOIE4))
#define TIMER_DISABLE_INTR (TIMSK4 = 0)
#define TIMER_INTR_NAME TIMER4_OVF_vect
#define TIMER_CONFIG_KHZ(val) ({ \
const uint16_t pwmval = SYSCLOCK / 2000 / (val); \
TCCR4A = (1<<PWM4A); \
TCCR4B = _BV(CS40); \
TCCR4C = 0; \
TCCR4D = (1<<WGM40); \
TCCR4E = 0; \
TC4H = pwmval >> 8; \
OCR4C = pwmval; \
TC4H = (pwmval / 3) >> 8; \
OCR4A = (pwmval / 3) & 255; \
})known_boards.h (AltSerial)
Code:
// Teensy 2.0
//
#if defined(__AVR_ATmega32U4__) && defined(CORE_TEENSY)
//#define ALTSS_USE_TIMER1
//#define INPUT_CAPTURE_PIN 22 // receive
//#define OUTPUT_COMPARE_A_PIN 14 // transmit
//#define OUTPUT_COMPARE_B_PIN 15 // unusable PWM
//#define OUTPUT_COMPARE_C_PIN 4 // unusable PWM
#define ALTSS_USE_TIMER3
#define INPUT_CAPTURE_PIN 10 // receive
#define OUTPUT_COMPARE_A_PIN 9 // transmit
Code:
#elif defined(ALTSS_USE_TIMER3)
#define CONFIG_TIMER_NOPRESCALE() (TIMSK3 = 0, TCCR3A = 0, TCCR3B = (1<<ICNC3) | (1<<CS30))
#define CONFIG_TIMER_PRESCALE_8() (TIMSK3 = 0, TCCR3A = 0, TCCR3B = (1<<ICNC3) | (1<<CS31))
#define CONFIG_MATCH_NORMAL() (TCCR3A = TCCR3A & ~((1<<COM3A1) | (1<<COM3A0)))
#define CONFIG_MATCH_TOGGLE() (TCCR3A = (TCCR3A & ~(1<<COM3A1)) | (1<<COM3A0))
#define CONFIG_MATCH_CLEAR() (TCCR3A = (TCCR3A | (1<<COM3A1)) & ~(1<<COM3A0))
#define CONFIG_MATCH_SET() (TCCR3A = TCCR3A | ((1<<COM3A1) | (1<<COM3A0)))
#define CONFIG_CAPTURE_FALLING_EDGE() (TCCR3B &= ~(1<<ICES3))
#define CONFIG_CAPTURE_RISING_EDGE() (TCCR3B |= (1<<ICES3))
#define ENABLE_INT_INPUT_CAPTURE() (TIFR3 = (1<<ICF3), TIMSK3 = (1<<ICIE3))
#define ENABLE_INT_COMPARE_A() (TIFR3 = (1<<OCF3A), TIMSK3 |= (1<<OCIE3A))
#define ENABLE_INT_COMPARE_B() (TIFR3 = (1<<OCF3B), TIMSK3 |= (1<<OCIE3B))
#define DISABLE_INT_INPUT_CAPTURE() (TIMSK3 &= ~(1<<ICIE3))
#define DISABLE_INT_COMPARE_A() (TIMSK3 &= ~(1<<OCIE3A))
#define DISABLE_INT_COMPARE_B() (TIMSK3 &= ~(1<<OCIE3B))
#define GET_TIMER_COUNT() (TCNT3)
#define GET_INPUT_CAPTURE() (ICR3)
#define GET_COMPARE_A() (OCR3A)
#define GET_COMPARE_B() (OCR3B)
#define SET_COMPARE_A(val) (OCR3A = (val))
#define SET_COMPARE_B(val) (OCR3B = (val))
#define CAPTURE_INTERRUPT TIMER3_CAPT_vect
#define COMPARE_A_INTERRUPT TIMER3_COMPA_vect
#define COMPARE_B_INTERRUPT TIMER3_COMPB_vectI won't send IR and serial TX simultaneously, one sending at a time, my last option will be to add additional hardware demultiplexer in the circuit.
Can this last option work ?
