Split project structure to fw/hw, KiCad gitignore

Firmware/test/README

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+
+This directory is intended for PIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html

Firmware/test/test_demo.c

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+#include <stdint.h>
+#include <unity.h>
+#include <util/delay.h>
+#include "fifo.h"
+
+#include "unittest_transport.h"
+
+void test_fifo(void)
+{
+    uint8_t buf[3];
+    fifo_t f;
+    fifo_init(&f, buf, sizeof(buf));
+    fifo_put(&f, 0x11);
+    fifo_put(&f, 0x22);
+    fifo_put(&f, 0x33);
+
+    TEST_ASSERT_EQUAL(fifo_get_nowait(&f), 0x11);
+    TEST_ASSERT_EQUAL(fifo_get_nowait(&f), 0x22);
+    TEST_ASSERT_EQUAL(fifo_get_nowait(&f), 0x33);
+}
+
+int main()
+{
+    // NOTE!!! Wait for >2 secs
+    // if board doesn't support software reset via Serial.DTR/RTS
+    _delay_ms(2000);
+
+    DDRB |= 0x2;
+    PORTB &= ~0x2;
+
+    UNITY_BEGIN(); // IMPORTANT LINE!
+    RUN_TEST(test_fifo);
+    UNITY_END(); // stop unit testing
+
+    PORTB |= 0x2;
+    DDRB |= 0x4;
+    PORTB &= ~0x4;
+
+    while (1)
+        ;
+}

Firmware/test/unittest_transport.h

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+#ifndef UNITTEST_TRANSPORT_H
+#define UNITTEST_TRANSPORT_H
+
+#include <avr/io.h>
+#include <stdint.h>
+#include "uart.h"
+
+void unittest_uart_begin()
+{
+    // Set Baudrate according to datasheet (16MHz -> 9600 Baud -> 103)
+    UBRR0 = 103;
+    UCSR0B |= (1<<TXEN0);
+
+    // Reset Complete-Flags
+    UCSR0A = (1 << RXC0) | (1 << TXC0);
+}
+
+void unittest_uart_putchar(char c)
+{
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+    UDR0 = c;
+}
+
+void unittest_uart_flush()
+{
+}
+
+void unittest_uart_end()
+{
+}
+
+#endif