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/*
* Copyright 2020 Daniel Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "arch.h"
#include "driver/neopixel.h"
#include "driver/stdout.h"
#include <util/delay.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#define CLOCK_LO ( ( PIND & _BV(PD3) ) != 0 )
#define CLOCK_HI ( ( PIND & _BV(PD3) ) == 0 )
#define DATA_LO ( ( PIND & _BV(PD2) ) != 0 )
#define DATA_HI ( ( PIND & _BV(PD2) ) == 0 )
#define DATA_BIT ( ( ~PIND & _BV(PD2) ) >> PD2 )
#define BUF_SIZE 36
#define BUF_MAX ((BUF_SIZE)-1)
#define RINGBUF_SIZE ((BUF_SIZE)+2)
#define NUM_PIXELS 256
Adafruit_NeoPixel np(NUM_PIXELS, GPIO::pb0, NEO_GRB+NEO_KHZ800);
#define MYADDRESS (0x0006)
volatile uint16_t address;
volatile uint8_t ringbuf[RINGBUF_SIZE];
volatile uint8_t ringbuf_byte = 0;
volatile uint8_t ringbuf_bitmask = 0x80;
volatile uint8_t buf[BUF_SIZE];
volatile uint8_t done;
void update()
{
if (buf[0] > 100) {
buf[0] = 100;
}
if (buf[1] + buf[2] + buf[3] > 50) {
buf[1] = 5;
buf[2] = 0;
buf[3] = 0;
}
uint32_t color = np.Color(buf[1], buf[2], buf[3]);
uint8_t rgb = buf[0];
for (uint8_t col = 0; col < 32; col++) {
for (uint8_t row = 0; row < 8; row++) {
uint8_t pixel_index = col*8;
if (col % 2) {
pixel_index += 7 - row;
} else {
pixel_index += row;
}
if (rgb) {
color = np.gamma32(np.ColorHSV(((uint16_t)col*8+row) * 255, 255, rgb));
}
if (buf[31-col+4] & _BV(row)) {
np.setPixelColor(pixel_index, color);
} else {
np.setPixelColor(pixel_index, 0);
}
}
}
np.show();
}
void next_bit(uint8_t *byte, uint8_t *mask, uint8_t const size)
{
if (*mask > 0x01) {
*mask >>= 1;
} else {
*byte = (*byte + 1) % size;
*mask = 0x80;
}
}
void ringbuf_to_buf(void)
{
uint8_t read_byte = ringbuf_byte;
uint8_t read_bitmask = ringbuf_bitmask;
// byte[bitmask] is the next bit that would be written -- and, thanks to
// the buffer size, also the most significant bit of message byte 0.
for (uint8_t write_byte = 0; write_byte < BUF_SIZE; write_byte++) {
buf[write_byte] = 0;
for (uint8_t write_bitmask = 0x80; write_bitmask > 0; write_bitmask >>= 1) {
if (ringbuf[read_byte] & read_bitmask) {
buf[write_byte] |= write_bitmask;
}
if (read_bitmask > 0x01) {
read_bitmask >>= 1;
} else {
read_byte = (read_byte + 1) % RINGBUF_SIZE;
read_bitmask = 0x80;
}
}
}
}
int main(void)
{
arch.setup();
gpio.setup();
kout.setup();
np.setup();
PORTD = _BV(PD2) | _BV(PD3);
EICRA = _BV(ISC10);
EIMSK = _BV(INT1);
np.setPixelColor(0, np.Color(0, 1, 1));
np.setPixelColor(7, np.Color(0, 1, 1));
np.setPixelColor(248, np.Color(0, 1, 1));
np.setPixelColor(255, np.Color(0, 1, 1));
np.show();
while (1) {
arch.idle();
if (done) {
/*
kout << dec << "done, byte=" << ringbuf_byte << hex << " bitmask=" << ringbuf_bitmask << " ringbuf = " << hex;
for (uint8_t i = 0; i < RINGBUF_SIZE; i++) {
kout << ringbuf[i] << " ";
}
kout << endl;
*/
ringbuf_to_buf();
/*
kout << "update, buf = " << hex;
for (uint8_t i = 0; i < BUF_SIZE; i++) {
kout << buf[i] << " ";
}
kout << endl;
*/
update();
done = 0;
}
}
return 0;
}
ISR(INT1_vect)
{
if (CLOCK_HI && !done) {
if (DATA_BIT) {
ringbuf[ringbuf_byte] |= ringbuf_bitmask;
address = (address << 1) | 1;
gpio.led_on(0);
} else {
ringbuf[ringbuf_byte] &= ~ringbuf_bitmask;
address = (address << 1) | 0;
gpio.led_off(0);
}
if (ringbuf_bitmask > 0x01) {
ringbuf_bitmask >>= 1;
} else {
ringbuf_byte = (ringbuf_byte + 1) % RINGBUF_SIZE;
ringbuf_bitmask = 0x80;
}
}
else if (DATA_HI && (address == MYADDRESS)) {
done = 1;
}
}
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