First commit

Author: pcm720

LICENSE

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+
+PRJ = main
+MCU = atmega88p
+CLK = 8000000UL
+
+# Libraries
+LIBSRC = $(wildcard *.c)
+LIBOBJ = $(LIBSRC:.c=.o)
+LIBHDR = $(LIBSRC:.c=.h)
+
+# Compiler and linker settings
+CPPFLAGS = -mmcu=$(MCU) -DF_CPU=$(CLK) -I. -I$(LIBDIR) -Wall
+CFLAGS = -Os -g -std=gnu11 -Wall
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -ffunction-sections -fdata-sections 
+LDFLAGS = -Wl,-Map,$(PRJ).map -mmcu=$(MCU) 
+LDFLAGS += -Wl,--gc-sections
+
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE    = avr-size --format=avr --mcu=$(MCU)
+CC      = avr-gcc
+
+# Programmer settings
+PRG = apu2 -P ft0
+AVRDUDE = taskset -c 1 avrdude -c $(PRG) -p $(MCU) -C ~/.avrduderc -C /etc/avrdude.conf
+LFU = 0xE2
+HFU = 0xDF
+EFU = 0xFF
+
+all: $(PRJ).hex
+
+clean:
+	rm -f *.hex *.elf *.o *.map $(LIBOBJ)
+
+test:
+	$(AVRDUDE) -v
+
+flash: all
+	$(AVRDUDE) -U flash:w:$(PRJ).hex:i
+
+fuse:
+	$(AVRDUDE) -U lfuse:w:$(LFU):m -B 1200 -U hfuse:w:$(HFU):m -U efuse:w:$(EFU):m
+
+disasm: $(PRJ).elf
+	$(OBJDUMP) -d $(PRJ).elf
+
+%.o: %.c $(LIBHDR) Makefile
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<;
+
+$(PRJ).elf: $(LIBOBJ)
+	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
+
+$(PRJ).hex: $(PRJ).elf
+	rm -f $(PRJ).hex
+	$(OBJCOPY) -j .text -j .data -O ihex $(PRJ).elf $(PRJ).hex
+	$(SIZE) $(PRJ).elf

Makefile

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+# 4-port HDMI Switch
+
+A pretty basic 4-port HDMI Switch design based on three Texas Instruments HD3SS215 2:1/1:2 Differential Switch ICs and ATmega88PA-AU microcontroller.
+
+# Notes
+
+Some kind of hot-air rework station is strongly recommended for soldering HD3SS215.
+
+# Images
+
+You can find more pictures in *extra/pictures*
+
+![Switch](extra/pictures/Front.jpg)

README.md

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+/*
+Main definitions file for HDMI Switcher
+    Copyright (C) 2018 pcm720 <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see 
+<http://www.gnu.org/licenses/>.
+*/
+
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+/* switch states (used for outputState/selectedState)
+    outputState/selectedState map:
+        bits: 76543210
+        76543: not used
+        2:     output          (enabled — 1, disabled — 0)
+        1:     selected switch (SW1 — 1, SW2 — 0)
+        0:     selected port   (A — 0, B — 1)
+*/
+#define OFF   0x0
+#define HDMI1 0x6 // 0b110
+#define HDMI2 0x7 // 0b111
+#define HDMI3 0x4 // 0b100
+#define HDMI4 0x5 // 0b101
+
+// inputs (PORT D)
+#define B_OFF   0x1B
+#define B_HDMI1 0x1E
+#define B_HDMI2 0x1D
+#define B_HDMI3 0x17
+#define B_HDMI4 0x0F
+
+// LEDs (PORT B)
+#define LED_HDMI1 0x0
+#define LED_HDMI2 0x1
+#define LED_HDMI3 0x6
+#define LED_HDMI4 0x7
+
+// switch control pins configuration (PORT C)
+#define SW1_SW2_OE  0x28 // 0b101000
+#define SW3_OE      0x2  // 0b10
+#define Dx_SEL_MASK 0x15 // 0b010101
+#define PC_HDMI1    0x23 // 0b100011
+#define PC_HDMI2    0x33 // 0b110011
+#define PC_HDMI3    0xA  // 0b001010
+#define PC_HDMI4    0xE  // 0b001110
+
+/*
+PC0 = SW3_Dx_SEL
+PC1 = SW3_OE
+PC2 = SW2_Dx_SEL
+PC3 = SW2_OE
+PC4 = SW1_Dx_SEL
+PC5 = SW1_OE
+
+            OFF                 HDMI1                  HDMI2                   HDMI3                   HDMI4
+        OE      DxSEL        OE      DxSEL          OE      DxSEL           OE      DxSEL           OE      DxSEL
+SW1     LOW     —            HIGH    LOW            HIGH    HIGH            LOW     —               LOW     —
+SW2     LOW     —            LOW     —              LOW     —               HIGH    LOW             HIGH    HIGH
+SW3     LOW     —            HIGH    HIGH           HIGH    HIGH            HIGH    LOW             HIGH    LOW
+*/
+
+#endif

common.h

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+/*
+EEPROM operations
+    Copyright (C) 2018 pcm720 <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see 
+<http://www.gnu.org/licenses/>.
+*/
+
+#include "eeprom.h"
+#include <avr/eeprom.h>
+#include <util/atomic.h>
+
+static inline uint8_t calculate_parity(uint8_t* state);
+
+uint8_t eeprom_read(uint8_t* state) {
+    uint8_t parity_bit;
+    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+        eeprom_read_block((void*)state, (void*)0, sizeof(*state));
+        parity_bit = ((*state >> 0x7) & 1); // get parity bit read from EEPROM
+        *state &= ~0x80; // clear parity bit from state
+    }
+    if (calculate_parity(state) != parity_bit) return 1; // read failed
+    else return 0;
+}
+
+uint8_t eeprom_write(uint8_t state) {
+    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+        state = state + (calculate_parity(&state) << 0x7); // 8th bit of state is a parity bit
+        eeprom_update_block((const void*)&state, (void*)0, sizeof(state));
+    }
+    return eeprom_read(&state); // if write failed, returns 1
+}
+
+static inline uint8_t calculate_parity(uint8_t* state) {
+    return ((*state >> 1) ^ (*state >> 2) ^ (*state >> 3)) & 1;
+}

eeprom.c

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+/*
+Header file for EEPROM operations
+    Copyright (C) 2018 pcm720 <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see 
+<http://www.gnu.org/licenses/>.
+*/
+
+#ifndef EEPROM_H_
+#define EEPROM_H_
+
+#include "common.h"
+
+uint8_t eeprom_read(uint8_t* state);
+uint8_t eeprom_write(uint8_t state);
+
+#endif

eeprom.h

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+Reference				|	Value		|	Size		|	Count
+
+Buttons:
+B1-B5					|	1243SHIM					|	5
+
+Diodes:
+D1						|	BAT54		|	SOT-23		|	1
+D2-D6					|	KP-2012SGD					|	5
+
+Fuses:
+F1						|	MF-MSMF050-2				|	1
+
+HDMI Sockets:
+HDMI1-HDMI4				|	DS1114-BN0					|	4
+HDMI5					|	LOTES, Model # Unknown		|	1
+
+Headers:
+ISP1					|	IDC-06MS/2.54 pin header	|	1
+
+USB Sockets:
+J1						|	Molex_47346-0001			|	1
+
+Resistors:
+R1-R4, R18				|	1M			|	0805		|	5
+R5-R8					|	100k		|	0805		|	4
+R10-R11					|	47k			|	0805		|	2
+R14-R17, R19-R21, R27	|	10k			|	0805		|	8
+R22-R25					|	200			|	0805		|	4
+R26						|	1k			|	0805		|	1
+
+
+ICs:
+U1-U3					|	HD3SS215RTQT				| 3
+U4						|	ATMEGA88PA-AU
+U5						|	AMS1117-3.3
+
+Capacitors:
+С1-C10, C12				|	0.1 uF		|	0805		|	11
+С11, C13, C15, C17		|	100 nF		|	0603		|	4
+С14, C16				|	47 uF 10V	|	Tantalum B	|	2