Commit 19c0be34 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

add preliminary arduino nano dmx driver 

note that it disables stdout / kout support, as the ATMega328 only has one
UART.
parent b78f5950

include/arch/arduino-nano/driver/dmx.h

0 → 100644
+20 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2022 Daniel Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */



class DMX {

	private:

		DMX(const DMX &copy);



	public:

		unsigned char frames[16];



		DMX() {}



		void setup();

		void write();

};



extern DMX dmx;

src/arch/arduino-nano/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -35,6 +35,15 @@ config arch_arduino_nano_driver_timer 
bool "Timer with Interrupts"

select meta_driver_timer



config arch_arduino_nano_driver_dmx

bool "DMX"

select meta_driver_dmx



config arch_arduino_nano_driver_dmx_pin

string "DMX Pin"

default "pb5"

depends on arch_arduino_nano_driver_dmx



choice arch_arduino_nano_cpu

bool "CPU Type"

src/arch/arduino-nano/Makefile.inc

+4 −0
Original line number Diff line number Diff line
@@ -88,6 +88,10 @@ ifdef CONFIG_arch_arduino_nano_driver_adc 
	CXX_TARGETS += src/arch/arduino-nano/driver/adc.cc

endif



ifdef CONFIG_arch_arduino_nano_driver_dmx

	CXX_TARGETS += src/arch/arduino-nano/driver/dmx.cc

endif



ifdef CONFIG_arch_arduino_nano_driver_spi

	CXX_TARGETS += src/arch/arduino-nano/driver/spi.cc

endif

src/arch/arduino-nano/driver/dmx.cc

0 → 100644
+52 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2022 Daniel Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <avr/io.h>

#include "arch.h"

#include "driver/dmx.h"

#include "driver/gpio.h"



#define BAUD 250000UL

#include <util/setbaud.h>



void DMX::setup()

{

	UBRR0H = UBRRH_VALUE;

	UBRR0L = UBRRL_VALUE;



#if USE_2X

	UCSR0A |= _BV(U2X0);

#else

	UCSR0A &= ~_BV(U2X0);

#endif



	UCSR0B |= _BV(TXEN0);

	UCSR0C = _BV(USBS0) | _BV(UCSZ01) | _BV(UCSZ00); // 8 bits

}



void DMX::write()

{

	// Disable UART for reset and mark signals

	UCSR0B &= ~_BV(TXEN0);

	gpio.output(GPIO::pd1, 0);

	arch.delay_us(88); // break

	gpio.output(GPIO::pd1, 1);

	arch.delay_us(8);

	UCSR0B |= _BV(TXEN0); // causes line to go high

	for (uint8_t i = 0; i < 16; i++) {

		while (!(UCSR0A & _BV(UDRE0)));

		UDR0 = frames[i];

	}

	for (uint8_t i = 0; i < 241; i++) {

		while (!(UCSR0A & _BV(UDRE0)));

		UDR0 = 0;

	}

	for (uint8_t i = 0; i < 255; i++) {

		while (!(UCSR0A & _BV(UDRE0)));

		UDR0 = 0;

	}

}



DMX dmx;

src/driver/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -6,6 +6,8 @@ config meta_driver_adc 
bool

config meta_driver_counter

bool

config meta_driver_dmx

bool

config meta_driver_hardware_i2c

bool

config meta_driver_i2c