Sync Triple-A libraries.
This commit is contained in:
Mika Tuupola
parent
471fc46da6
commit
6f11fafbef
72
tpic6b595_shiftout/pins/arduino.h
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72
tpic6b595_shiftout/pins/arduino.h
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@ -0,0 +1,72 @@
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/*
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* arduino.h
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*
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* Lightweight macro implementation of Arduino style pin numbering
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* for accessing Atmel digital and analog pins.
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*
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* pin_mode(1, OUTPUT);
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* digital_write(1, HIGH);
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* pin_mode(2, INPUT);
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* digital_read(2);
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*
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* This file is based on Arduino project.
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* https://github.com/arduino/Arduino/
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*
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* Copyright (c) 2007-2011 David A. Mellis, Mika tuupola
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*
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* Licensed under the LGPL 2.1 license:
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* http://www.opensource.org/licenses/lgpl-2.1.php
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*/
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#ifndef ARDUINO_H
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#define ARDUINO_H
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/* atmega328 */
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#define PORT_AT_PIN_0 PortD
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#define PORT_AT_PIN_1 PortD
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#define PORT_AT_PIN_2 PortD
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#define PORT_AT_PIN_3 PortD
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#define PORT_AT_PIN_4 PortD
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#define PORT_AT_PIN_5 PortD
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#define PORT_AT_PIN_6 PortD
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#define PORT_AT_PIN_7 PortD
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#define PORT_AT_PIN_8 PortB
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#define PORT_AT_PIN_9 PortB
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#define PORT_AT_PIN_10 PortB
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#define PORT_AT_PIN_11 PortB
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#define PORT_AT_PIN_12 PortB
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#define PORT_AT_PIN_13 PortB
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#define PORT_AT_PIN_14 PortC
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#define PORT_AT_PIN_15 PortC
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#define PORT_AT_PIN_16 PortC
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#define PORT_AT_PIN_17 PortC
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#define PORT_AT_PIN_18 PortC
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#define PORT_AT_PIN_19 PortC
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#define PORT_AT_PIN_20 PortB
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#define PORT_AT_PIN_21 PortB
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#define MASK_AT_PIN_0 _BV(0)
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#define MASK_AT_PIN_1 _BV(1)
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#define MASK_AT_PIN_2 _BV(2)
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#define MASK_AT_PIN_3 _BV(3)
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#define MASK_AT_PIN_4 _BV(4)
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#define MASK_AT_PIN_5 _BV(5)
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#define MASK_AT_PIN_6 _BV(6)
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#define MASK_AT_PIN_7 _BV(7)
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#define MASK_AT_PIN_8 _BV(0)
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#define MASK_AT_PIN_9 _BV(1)
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#define MASK_AT_PIN_10 _BV(2)
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#define MASK_AT_PIN_11 _BV(3)
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#define MASK_AT_PIN_12 _BV(4)
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#define MASK_AT_PIN_13 _BV(5)
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#define MASK_AT_PIN_14 _BV(0)
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#define MASK_AT_PIN_15 _BV(1)
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#define MASK_AT_PIN_16 _BV(2)
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#define MASK_AT_PIN_17 _BV(3)
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#define MASK_AT_PIN_18 _BV(4)
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#define MASK_AT_PIN_19 _BV(5)
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#define MASK_AT_PIN_20 _BV(6)
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#define MASK_AT_PIN_21 _BV(7)
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#endif /* ARDUINO_H */
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33
tpic6b595_shiftout/pins/digital.h
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33
tpic6b595_shiftout/pins/digital.h
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/*
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* digital.h
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*
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* Lightweight macro implementation of AVR pin numbering for
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* accessing Atmel digital and analog pins.
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*
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* pin_mode(A1, OUTPUT);
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* digital_write(A1, HIGH);
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* pin_mode(A2, INPUT);
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* digital_read(A2);
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*
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* This file is based on the excellent ArduinoLite project by
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* Shikai Chen <csk@live.com>.
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*
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* http://code.google.com/p/arduino-lite/
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* http://www.csksoft.net/
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*
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* Copyright (c) 2010-2011 Shikai Chen, Mika Tuupola
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*
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* Licensed under the LGPL 2.1 license:
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* http://www.opensource.org/licenses/lgpl-2.1.php
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*/
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#ifndef DIGITAL_H
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#define DIGITAL_H
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#include "pins.h"
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#define digital_read(pin) EXPAND_WRAPPER(_DIGITAL_READ, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define digital_read_raw(pin) EXPAND_WRAPPER(_DIGITAL_READ_RAW, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define digital_write(pin, val) DIGITAL_WRITE_##val(pin)
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#define digital_toggle(pin) EXPAND_WRAPPER(_DIGITAL_TOGGLE, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#endif /* DIGITAL_H */
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228
tpic6b595_shiftout/pins/pins.h
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228
tpic6b595_shiftout/pins/pins.h
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@ -0,0 +1,228 @@
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/*
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* pins.h
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*
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* Lightweight macro implementation of AVR pin numbering for
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* accessing Atmel digital and analog pins.
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*
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* pin_mode(A1, OUTPUT);
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* digital_write(A1, HIGH);
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* pin_mode(A2, INPUT);
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* digital_read(A2);
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*
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* This file is based on the excellent ArduinoLite project by
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* Shikai Chen <csk@live.com>.
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*
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* http://code.google.com/p/arduino-lite/
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* http://www.csksoft.net/
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*
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* Copyright (c) 2010-2011 Shikai Chen, Mika Tuupola
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*
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* Licensed under the LGPL 2.1 license:
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* http://www.opensource.org/licenses/lgpl-2.1.php
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*/
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#ifndef PINS_H
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#define PINS_H
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#include <avr/sfr_defs.h>
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#include <avr/io.h>
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#include "arduino.h"
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#define HIGH 0x1
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#define LOW 0x0
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#define INPUT 0x0
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#define OUTPUT 0x1
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#define ENABLE 0x1
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#define DISABLE 0x0
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#define PIN_TO_PORT(x) PORT_AT_PIN_##x
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#define PIN_TO_MASK(x) MASK_AT_PIN_##x
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#define PORT_TO_DIRECTION_REGISTER(x) DIRECTION_REGISTER_AT_##x
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#define PORT_TO_OUTPUT_REGISTER(x) OUTPUT_REGISTER_AT_##x
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#define PORT_TO_INPUT_REGISTER(x) INPUT_REGISTER_AT_##x
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#ifdef PORTA
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#define DIRECTION_REGISTER_AT_PortA DDRA
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#define OUTPUT_REGISTER_AT_PortA PORTA
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#define INPUT_REGISTER_AT_PortA PINA
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#define PORT_AT_PIN_A0 PortA
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#define PORT_AT_PIN_A1 PortA
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#define PORT_AT_PIN_A2 PortA
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#define PORT_AT_PIN_A3 PortA
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#define PORT_AT_PIN_A4 PortA
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#define PORT_AT_PIN_A5 PortA
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#define PORT_AT_PIN_A6 PortA
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#define PORT_AT_PIN_A7 PortA
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#define MASK_AT_PIN_A0 _BV(0)
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#define MASK_AT_PIN_A1 _BV(1)
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#define MASK_AT_PIN_A2 _BV(2)
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#define MASK_AT_PIN_A3 _BV(3)
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#define MASK_AT_PIN_A4 _BV(4)
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#define MASK_AT_PIN_A5 _BV(5)
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#define MASK_AT_PIN_A6 _BV(6)
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#define MASK_AT_PIN_A7 _BV(7)
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#endif
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#ifdef PORTB
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#define DIRECTION_REGISTER_AT_PortB DDRB
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#define OUTPUT_REGISTER_AT_PortB PORTB
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#define INPUT_REGISTER_AT_PortB PINB
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#define PORT_AT_PIN_B0 PortB
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#define PORT_AT_PIN_B1 PortB
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#define PORT_AT_PIN_B2 PortB
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#define PORT_AT_PIN_B3 PortB
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#define PORT_AT_PIN_B4 PortB
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#define PORT_AT_PIN_B5 PortB
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#define PORT_AT_PIN_B6 PortB
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#define PORT_AT_PIN_B7 PortB
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#define MASK_AT_PIN_B0 _BV(0)
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#define MASK_AT_PIN_B1 _BV(1)
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#define MASK_AT_PIN_B2 _BV(2)
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#define MASK_AT_PIN_B3 _BV(3)
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#define MASK_AT_PIN_B4 _BV(4)
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#define MASK_AT_PIN_B5 _BV(5)
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#define MASK_AT_PIN_B6 _BV(6)
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#define MASK_AT_PIN_B7 _BV(7)
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#endif
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#ifdef PORTC
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#define DIRECTION_REGISTER_AT_PortC DDRC
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#define OUTPUT_REGISTER_AT_PortC PORTC
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#define INPUT_REGISTER_AT_PortC PINC
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#define PORT_AT_PIN_C0 PortC
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#define PORT_AT_PIN_C1 PortC
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#define PORT_AT_PIN_C2 PortC
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#define PORT_AT_PIN_C3 PortC
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#define PORT_AT_PIN_C4 PortC
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#define PORT_AT_PIN_C5 PortC
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#define PORT_AT_PIN_C6 PortC
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#define PORT_AT_PIN_C7 PortC
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#define MASK_AT_PIN_C0 _BV(0)
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#define MASK_AT_PIN_C1 _BV(1)
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#define MASK_AT_PIN_C2 _BV(2)
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#define MASK_AT_PIN_C3 _BV(3)
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#define MASK_AT_PIN_C4 _BV(4)
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#define MASK_AT_PIN_C5 _BV(5)
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#define MASK_AT_PIN_C6 _BV(6)
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#define MASK_AT_PIN_C7 _BV(7)
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#endif
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#ifdef PORTD
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#define DIRECTION_REGISTER_AT_PortD DDRD
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#define OUTPUT_REGISTER_AT_PortD PORTD
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#define INPUT_REGISTER_AT_PortD PIND
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#define PORT_AT_PIN_D0 PortD
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#define PORT_AT_PIN_D1 PortD
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#define PORT_AT_PIN_D2 PortD
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#define PORT_AT_PIN_D3 PortD
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#define PORT_AT_PIN_D4 PortD
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#define PORT_AT_PIN_D5 PortD
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#define PORT_AT_PIN_D6 PortD
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#define PORT_AT_PIN_D7 PortD
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#define MASK_AT_PIN_D0 _BV(0)
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#define MASK_AT_PIN_D1 _BV(1)
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#define MASK_AT_PIN_D2 _BV(2)
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#define MASK_AT_PIN_D3 _BV(3)
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#define MASK_AT_PIN_D4 _BV(4)
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#define MASK_AT_PIN_D5 _BV(5)
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#define MASK_AT_PIN_D6 _BV(6)
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#define MASK_AT_PIN_D7 _BV(7)
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#endif
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#ifdef PORTE
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#define DIRECTION_REGISTER_AT_PortE DDRE
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#define OUTPUT_REGISTER_AT_PortE PORTE
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#define INPUT_REGISTER_AT_PortE PINE
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#define PORT_AT_PIN_E0 PortE
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#define PORT_AT_PIN_E1 PortE
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#define PORT_AT_PIN_E2 PortE
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#define PORT_AT_PIN_E3 PortE
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#define PORT_AT_PIN_E4 PortE
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#define PORT_AT_PIN_E5 PortE
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#define PORT_AT_PIN_E6 PortE
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#define PORT_AT_PIN_E7 PortE
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#define MASK_AT_PIN_E0 _BV(0)
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#define MASK_AT_PIN_E1 _BV(1)
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#define MASK_AT_PIN_E2 _BV(2)
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#define MASK_AT_PIN_E3 _BV(3)
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#define MASK_AT_PIN_E4 _BV(4)
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#define MASK_AT_PIN_E5 _BV(5)
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#define MASK_AT_PIN_E6 _BV(6)
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#define MASK_AT_PIN_E7 _BV(7)
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#endif
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#ifdef PORTF
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#define DIRECTION_REGISTER_AT_PortF DDRF
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#define OUTPUT_REGISTER_AT_PortF PORTF
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#define INPUT_REGISTER_AT_PortF PINF
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#define PORT_AT_PIN_F0 PortF
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#define PORT_AT_PIN_F1 PortF
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#define PORT_AT_PIN_F2 PortF
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#define PORT_AT_PIN_F3 PortF
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#define PORT_AT_PIN_F4 PortF
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#define PORT_AT_PIN_F5 PortF
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#define PORT_AT_PIN_F6 PortF
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#define PORT_AT_PIN_F7 PortF
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#define MASK_AT_PIN_F0 _BV(0)
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#define MASK_AT_PIN_F1 _BV(1)
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#define MASK_AT_PIN_F2 _BV(2)
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#define MASK_AT_PIN_F3 _BV(3)
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#define MASK_AT_PIN_F4 _BV(4)
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#define MASK_AT_PIN_F5 _BV(5)
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#define MASK_AT_PIN_F6 _BV(6)
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#define MASK_AT_PIN_F7 _BV(7)
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#endif
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#define MERGE_TO_FUNC(prefix, id) prefix##_##id
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#define EXPAND_WRAPPER(NEXTLEVEL, ...) NEXTLEVEL(__VA_ARGS__)
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#define _SET_OUTPUT(port_id, msk) PORT_TO_DIRECTION_REGISTER(port_id) |= (msk)
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#define _SET_INPUT(port_id, msk) PORT_TO_DIRECTION_REGISTER(port_id) &= ~(msk)
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#define _DIGITAL_WRITE_HIGH(port_id, msk) PORT_TO_OUTPUT_REGISTER(port_id) |= (msk)
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#define _DIGITAL_WRITE_LOW(port_id, msk) PORT_TO_OUTPUT_REGISTER(port_id) &= ~(msk)
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#define _DIGITAL_READ_RAW(port_id, msk) ((PORT_TO_INPUT_REGISTER(port_id)) & (msk))
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#define _DIGITAL_READ(port_id, msk) (((PORT_TO_INPUT_REGISTER(port_id)) & (msk)) != 0 ? 1 : 0)
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#define _DIGITAL_TOGGLE(port_id, msk) PORT_TO_OUTPUT_REGISTER(port_id) ^= (msk)
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#define SET_1(pin) SET_OUTPUT(pin)
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#define SET_0(pin) SET_INPUT(pin)
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#define SET_0x1(pin) SET_OUTPUT(pin)
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#define SET_0x0(pin) SET_INPUT(pin)
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#define DIGITAL_WRITE_HIGH(pin) EXPAND_WRAPPER(_DIGITAL_WRITE_HIGH, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define DIGITAL_WRITE_LOW(pin) EXPAND_WRAPPER(_DIGITAL_WRITE_LOW, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define DIGITAL_WRITE_1(pin) DIGITAL_WRITE_HIGH(pin)
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#define DIGITAL_WRITE_0(pin) DIGITAL_WRITE_LOW(pin)
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#define DIGITAL_WRITE_0x1(pin) DIGITAL_WRITE_HIGH(pin)
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#define DIGITAL_WRITE_0x0(pin) DIGITAL_WRITE_LOW(pin)
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#define DIGITAL_WRITE_ENABLE(pin) DIGITAL_WRITE_HIGH(pin)
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#define DIGITAL_WRITE_DISABLE(pin) DIGITAL_WRITE_LOW(pin)
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#define SET_OUTPUT(pin) EXPAND_WRAPPER(_SET_OUTPUT, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define SET_INPUT(pin) EXPAND_WRAPPER(_SET_INPUT, PIN_TO_PORT(pin), PIN_TO_MASK(pin))
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#define pin_mode(pin, mode) SET_##mode(pin)
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#define pin_pullup(pin, val) DIGITAL_WRITE_##val(pin)
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#endif /* PINS_H */
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90
tpic6b595_shiftout/uart/uart.c
Normal file
90
tpic6b595_shiftout/uart/uart.c
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/*
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* Copyright 2011 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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*/
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#include <avr/io.h>
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#include <stdio.h>
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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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#ifndef BAUD
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#define BAUD 9600
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#endif
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#include <util/setbaud.h>
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#if defined (UBRR0H)
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#warning UART0
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#define UBRRxH UBRR0H
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#define UBRRxL UBRR0L
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#define UCSRxA UCSR0A
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#define U2Xx U2X0
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#define UCSRxC UCSR0C
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#define UCSZx1 UCSZ01
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#define UCSZx0 UCSZ00
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#define UCSRxB UCSR0B
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#define RXENx RXEN0
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#define TXENx TXEN0
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#define UDREx UDRE0
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#define RXCx RXC0
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#define UDRx UDR0
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#define UDRIEx UDRIE0
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#elif defined (UBRR1H)
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#warning UART1
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#define UBRRxH UBRR1H
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#define UBRRxL UBRR1L
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#define UCSRxA UCSR1A
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#define U2Xx U2X1
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#define UCSRxC UCSR1C
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#define UCSZx1 UCSZ11
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#define UCSZx0 UCSZ10
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#define UCSRxB UCSR1B
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#define RXENx RXEN1
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#define TXENx TXEN1
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#define UDREx UDRE1
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#define RXCx RXC1
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#define UDRx UDR1
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#define UDRIEx UDRIE1
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#else
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#error No UART?
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#endif
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/* http://www.cs.mun.ca/~rod/Winter2007/4723/notes/serial/serial.html */
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void uart_init(void) {
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UBRRxH = UBRRH_VALUE;
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UBRRxL = UBRRL_VALUE;
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#if USE_2X
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UCSRxA |= _BV(U2Xx);
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#else
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UCSRxA &= ~(_BV(U2Xx));
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#endif
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UCSRxC = _BV(UCSZx1) | _BV(UCSZx0); /* 8-bit data */
|
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UCSRxB = _BV(RXENx) | _BV(TXENx); /* Enable RX and TX */
|
||||
}
|
||||
|
||||
int uart_putchar(char c, FILE *stream) {
|
||||
if (c == '\n') {
|
||||
uart_putchar('\r', stream);
|
||||
}
|
||||
loop_until_bit_is_set(UCSRxA, UDREx);
|
||||
UDRx = c;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int uart_getchar(FILE *stream) {
|
||||
loop_until_bit_is_set(UCSRxA, RXCx);
|
||||
return UDRx;
|
||||
}
|
||||
23
tpic6b595_shiftout/uart/uart.h
Normal file
23
tpic6b595_shiftout/uart/uart.h
Normal file
@ -0,0 +1,23 @@
|
||||
/*
|
||||
* Copyright 2011 Mika Tuupola
|
||||
*
|
||||
* Licensed under the MIT license:
|
||||
* http://www.opensource.org/licenses/mit-license.php
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef UART_H
|
||||
#define UART_H
|
||||
|
||||
int uart_putchar(char c, FILE *stream);
|
||||
int uart_getchar(FILE *stream);
|
||||
|
||||
void uart_init(void);
|
||||
|
||||
/* http://www.ermicro.com/blog/?p=325 */
|
||||
|
||||
FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
|
||||
FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ);
|
||||
|
||||
#endif /* UART_H */
|
||||
|
||||
155
tpic6b595_shiftout/uart/uart_async.c
Normal file
155
tpic6b595_shiftout/uart/uart_async.c
Normal file
@ -0,0 +1,155 @@
|
||||
/*
|
||||
* Copyright 2011 Mika Tuupola
|
||||
*
|
||||
* Licensed under the MIT license:
|
||||
* http://www.opensource.org/licenses/mit-license.php
|
||||
*
|
||||
*/
|
||||
|
||||
/* Based on Atmel Application Note AVR 306 */
|
||||
|
||||
#include <avr/io.h>
|
||||
#include <avr/interrupt.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#ifndef BAUD
|
||||
#define BAUD 9600
|
||||
#endif
|
||||
#include <util/setbaud.h>
|
||||
|
||||
#ifndef UART_RX_BUFFER_SIZE
|
||||
#define UART_RX_BUFFER_SIZE 64
|
||||
#endif
|
||||
|
||||
#ifndef UART_TX_BUFFER_SIZE
|
||||
#define UART_TX_BUFFER_SIZE 64
|
||||
#endif
|
||||
|
||||
#if defined (UBRR0H)
|
||||
|
||||
#warning Using UART0
|
||||
#define UBRRxH UBRR0H
|
||||
#define UBRRxL UBRR0L
|
||||
#define UCSRxA UCSR0A
|
||||
#define U2Xx U2X0
|
||||
#define UCSRxC UCSR0C
|
||||
#define UCSZx1 UCSZ01
|
||||
#define UCSZx0 UCSZ00
|
||||
#define UCSRxB UCSR0B
|
||||
#define RXENx RXEN0
|
||||
#define TXENx TXEN0
|
||||
#define UDREx UDRE0
|
||||
#define RXCx RXC0
|
||||
#define UDRx UDR0
|
||||
#define UDRIEx UDRIE0
|
||||
|
||||
#define USARTx_RX_vect USART_RX_vect
|
||||
#define USARTx_UDRE_vect USART_UDRE_vect
|
||||
#elif defined (UBRR1H)
|
||||
|
||||
#warning Using UART1
|
||||
#define UBRRxH UBRR1H
|
||||
#define UBRRxL UBRR1L
|
||||
#define UCSRxA UCSR1A
|
||||
#define U2Xx U2X1
|
||||
#define UCSRxC UCSR1C
|
||||
#define UCSZx1 UCSZ11
|
||||
#define UCSZx0 UCSZ10
|
||||
#define UCSRxB UCSR1B
|
||||
#define RXENx RXEN1
|
||||
#define TXENx TXEN1
|
||||
#define UDREx UDRE1
|
||||
#define RXCx RXC1
|
||||
#define UDRx UDR1
|
||||
#define UDRIEx UDRIE1
|
||||
|
||||
#define USARTx_RX_vect USART1_RX_vect
|
||||
#define USARTx_UDRE_vect USART1_UDRE_vect
|
||||
|
||||
#else
|
||||
#error No UART?
|
||||
#endif
|
||||
|
||||
struct tx_ring {
|
||||
int buffer[UART_TX_BUFFER_SIZE];
|
||||
int start;
|
||||
int end;
|
||||
};
|
||||
|
||||
struct rx_ring {
|
||||
int buffer[UART_RX_BUFFER_SIZE];
|
||||
int start;
|
||||
int end;
|
||||
};
|
||||
|
||||
static struct tx_ring tx_buffer;
|
||||
static struct rx_ring rx_buffer;
|
||||
|
||||
/* http://www.cs.mun.ca/~rod/Winter2007/4723/notes/serial/serial.html */
|
||||
|
||||
void uart_init(void) {
|
||||
|
||||
tx_buffer.start = 0;
|
||||
tx_buffer.end = 0;
|
||||
|
||||
rx_buffer.start = 0;
|
||||
rx_buffer.end = 0;
|
||||
|
||||
UBRRxH = UBRRH_VALUE;
|
||||
UBRRxL = UBRRL_VALUE;
|
||||
|
||||
UCSRxC = _BV(UCSZx1) | _BV(UCSZx0); /* 8-bit data */
|
||||
UCSRxB = _BV(RXENx) | _BV(TXENx); /* Enable RX and TX */
|
||||
|
||||
sei();
|
||||
}
|
||||
|
||||
int uart_putchar(char c, FILE *stream) {
|
||||
if (c == '\n') {
|
||||
uart_putchar('\r', stream);
|
||||
}
|
||||
|
||||
int write_pointer = (tx_buffer.end + 1) % UART_TX_BUFFER_SIZE;
|
||||
|
||||
if (write_pointer != tx_buffer.start){
|
||||
tx_buffer.buffer[tx_buffer.end] = c;
|
||||
tx_buffer.end = write_pointer;
|
||||
|
||||
/* Data available. Enable the transmit interrupt for serial port 0. */
|
||||
UCSRxB |= _BV(UDRIEx);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int uart_getchar(FILE *stream) {
|
||||
int read_pointer = (rx_buffer.start + 1) % UART_RX_BUFFER_SIZE;
|
||||
|
||||
rx_buffer.start = read_pointer;
|
||||
return rx_buffer.buffer[read_pointer];
|
||||
}
|
||||
|
||||
ISR(USARTx_RX_vect) {
|
||||
int write_pointer = (rx_buffer.end + 1) % UART_RX_BUFFER_SIZE;
|
||||
|
||||
/* Add next byte to ringbuffer if it has space available. */
|
||||
if (write_pointer != rx_buffer.start){
|
||||
rx_buffer.buffer[rx_buffer.end] = UDRx;
|
||||
rx_buffer.end = write_pointer;
|
||||
}
|
||||
}
|
||||
|
||||
ISR(USARTx_UDRE_vect){
|
||||
int read_pointer = (tx_buffer.start + 1) % UART_TX_BUFFER_SIZE;
|
||||
|
||||
/* Transmit next byte if data available in ringbuffer. */
|
||||
if (read_pointer != tx_buffer.end) {
|
||||
UDRx = tx_buffer.buffer[read_pointer];
|
||||
tx_buffer.start = read_pointer;
|
||||
} else {
|
||||
/* Nothing to send. Disable the transmit interrupt for serial port x. */
|
||||
UCSRxB &= ~_BV(UDRIEx);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user