From d018623210358476b34dae805b6e902520b16c8f Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Fri, 17 Apr 2020 20:25:55 +0200
Subject: add derfmap -> 8x32 WS2812B matrix app

---
 src/app/ws2812b_dmap/Makefile.inc |   2 +
 src/app/ws2812b_dmap/main.cc      | 110 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 src/app/ws2812b_dmap/Makefile.inc
 create mode 100644 src/app/ws2812b_dmap/main.cc

(limited to 'src/app/ws2812b_dmap')

diff --git a/src/app/ws2812b_dmap/Makefile.inc b/src/app/ws2812b_dmap/Makefile.inc
new file mode 100644
index 0000000..ce0a386
--- /dev/null
+++ b/src/app/ws2812b_dmap/Makefile.inc
@@ -0,0 +1,2 @@
+loop ?= 1
+arch_drivers += ,stdin,neopixel
diff --git a/src/app/ws2812b_dmap/main.cc b/src/app/ws2812b_dmap/main.cc
new file mode 100644
index 0000000..6535dda
--- /dev/null
+++ b/src/app/ws2812b_dmap/main.cc
@@ -0,0 +1,110 @@
+#include "arch.h"
+#include "driver/neopixel.h"
+#include "driver/stdin.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 NUM_PIXELS 256
+
+Adafruit_NeoPixel np(NUM_PIXELS, GPIO::pb0, NEO_GRB+NEO_KHZ800);
+
+#define MYADDRESS (0x0006)
+
+volatile uint16_t address;
+volatile uint8_t buf[BUF_SIZE];
+volatile uint8_t done;
+
+void update()
+{
+	if (buf[35] > 100) {
+		buf[35] = 100;
+	}
+	if (buf[32] + buf[33] + buf[34] > 50) {
+		buf[32] = 0;
+		buf[33] = 0;
+		buf[34] = 5;
+	}
+	uint32_t color = np.Color(buf[34], buf[33], buf[32]);
+	uint8_t rgb = buf[35];
+	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[col] & _BV(row)) {
+				np.setPixelColor(pixel_index, color);
+			} else {
+				np.setPixelColor(pixel_index, 0);
+			}
+		}
+	}
+	np.show();
+}
+
+int main(void)
+{
+
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+	kin.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) {
+			update();
+			done = 0;
+		}
+	}
+
+	return 0;
+}
+
+ISR(INT1_vect)
+{
+	if (CLOCK_HI) {
+		for (uint8_t i = BUF_MAX; i > 0; i--) {
+			buf[i] = (buf[i] << 1) | (buf[i-1] >> 7);
+		}
+		buf[0] = (buf[0] << 1) | (address >> 15);
+		address = (address << 1) | DATA_BIT;
+		if (DATA_BIT) {
+			gpio.led_on(0);
+		} else {
+			gpio.led_off(0);
+		}
+	}
+	else if (DATA_HI && (address == MYADDRESS)) {
+		done = 1;
+	}
+}
-- 
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