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<h1 id="_1">마이컴 설계</h1>
<h2 id="_2">어셈블리 언어</h2>
<pre><code class="language-asm">
LOAD 10 ; R0 = 5
LOOP:
LED_ON ; LED 켜기
DELAY 1000 ; 대기
LED_OFF ; LED 끄기
DELAY 1000 ; 대기
DEC ; R0 = R0 - 1
JNZ LOOP ; R0 != 0이면 LOOP로 이동
JZ END_ON ; R0 == 0이면 END_ON으로 이동
END_ON:
LED_ON ; LED 켠 상태 유지
JMP END_ON ; 무한 반복
</code></pre>
<h2 id="cpu">CPU 구성</h2>
<p>CPU 내부의 구성은 다음과 같다.</p>
<ul>
<li>PC</li>
<li>ROM</li>
<li>Decoder</li>
<li>GPIO</li>
<li>Delay Counter</li>
<li>R0</li>
</ul>
<h2 id="_3">명령어</h2>
<p>0x1 LOAD n <br>
0x2 INC <br>
0x3 DEC<br>
0x4 JMP addr<br>
0x5 JZ addr<br>
0x6 JNZ addr<br>
0x7 LED_ON<br>
0x8 LED_OFF<br>
0x9 DELAY n<br></p>
<h2 id="_4">컴파일러</h2>
<p>어셉블리로 작성된 프로그램을 명령어 코드로 변환된 기계어 언어로 변환해주는 프로그램</p>
<pre><code class="language-bash">
python asmtohex.py led.asm
</code></pre>
<h2 id="_5">프로그램 다운로드</h2>
<p>시리얼을 통해서 기계어 hex 파일로 변환된 프로그램을 다운로드 한다.</p>
<pre><code>python hexsend.py led.hex
</code></pre>
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<h1 id="_1">어셈블러작성</h1>
<h2 id="led">LED 프로그램작성</h2>
<p>LED 를 제어하는 데 필요한 명령어를 구성을 한다.</p>
<h3 id="c">C 언어 표현</h3>
<p>C 언어로 작성된 프로그램은 다음과 같이 동작하는 프로그램</p>
<pre><code class="language-c">
#include &lt;stdint.h&gt;
void LED_ON(void);
void LED_OFF(void);
void DELAY(uint32_t ms);
int main(void)
{
int R0;
R0 = 10;
LOOP:
LED_ON();
DELAY(1000);
LED_OFF();
DELAY(1000);
R0--;
if (R0 != 0)
goto LOOP;
END_ON:
LED_ON();
while (1)
{
// JMP END_ON
}
return 0;
}
</code></pre>
<h3 id="asm">ASM 언어 표현</h3>
<ul>
<li><a href="../files/led.asm">led.asm 다운로드</a></li>
</ul>
<pre><code class="language-asm">
LOAD 10 ; R0 = 5
LOOP:
LED_ON ; LED 켜기
DELAY 1000 ; 대기
LED_OFF ; LED 끄기
DELAY 1000 ; 대기
DEC ; R0 = R0 - 1
JNZ LOOP ; R0 != 0이면 LOOP로 이동
JZ END_ON ; R0 == 0이면 END_ON으로 이동
END_ON:
LED_ON ; LED 켠 상태 유지
JMP END_ON ; 무한 반복
</code></pre>
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<h1 id="_1">다운로더 작성</h1>
<p>기계어 hex 파일로 FPGA 코어로 전송한다.</p>
<h2 id="_2">변환 프로그램 구동</h2>
<pre><code class="language-bash">python hexsend.py led.hex
</code></pre>
<p><img alt="내 사진" src="../imgs/asmtohex.png" /></p>
<h2 id="_3">변환프로그램</h2>
<p>hexsend.py 파일 이름으로 다음과 파이썬 언어로 작성한다.</p>
<p><a href="../files/hexsend.py">hexsend.py 다운로드</a></p>
<pre><code class="language-python">import sys
import time
from pathlib import Path
try:
import serial
except ImportError:
print(&quot;pyserial이 필요합니다.&quot;)
print(&quot;설치: pip install pyserial&quot;)
sys.exit(1)
PORT = &quot;COM3&quot;
BAUD = 115200
def read_hex_file(hex_path):
data = bytearray()
for line_no, raw_line in enumerate(hex_path.read_text(encoding=&quot;utf-8&quot;).splitlines(), start=1):
line = raw_line.split(&quot;;&quot;)[0].strip()
if not line:
continue
line = line.replace(&quot;0x&quot;, &quot;&quot;).replace(&quot;0X&quot;, &quot;&quot;)
if len(line) != 4:
raise ValueError(f&quot;{line_no}번째 줄 오류: 16비트 HEX 4자리여야 함: {raw_line}&quot;)
word = int(line, 16)
high = (word &gt;&gt; 8) &amp; 0xFF
low = word &amp; 0xFF
data.append(high)
data.append(low)
return data
def main():
if len(sys.argv) != 2:
print(&quot;사용법: python hexsend.py led.hex&quot;)
sys.exit(1)
hex_path = Path(sys.argv[1])
if not hex_path.exists():
print(f&quot;파일 없음: {hex_path}&quot;)
sys.exit(1)
send_data = read_hex_file(hex_path)
send_data.append(0xFF)
send_data.append(0xFF)
print(f&quot;파일: {hex_path}&quot;)
print(f&quot;전송 바이트 수: {len(send_data)}&quot;)
print(&quot;전송 데이터:&quot;)
print(send_data.hex(&quot; &quot;).upper())
ser = serial.Serial(
port=PORT,
baudrate=BAUD,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=1
)
time.sleep(2)
ser.reset_input_buffer()
ser.reset_output_buffer()
ser.write(send_data)
ser.flush()
ser.close()
print()
print(f&quot;{PORT}, {BAUD}bps 전송 완료&quot;)
if __name__ == &quot;__main__&quot;:
main()
</code></pre>
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<h1 id="_1">프로그램 실습</h1>
<ol>
<li>어셈블리 언어로 프로그램을 작성하고</li>
<li>컴파일 하고</li>
<li>hex 파일을 다운로드 </li>
<li>FPGA 실습키트에서 동작을 확인한다.</li>
<li>VHDL을 매번 수정,컴파일,다운로드하지 않아도, 프로그램 코드를 변경하여 원하는동작을 바로 실행할 수 있다.</li>
</ol>
<h2 id="_2">프로그램 작성</h2>
<p><img alt="내 사진" src="../imgs/asm.png" /></p>
<p>R0 의 값을 변경하거나, DELAY 의 값을 변경하여 프로그램을 수정한다.
R0 는 LED가 깜빡이는 횟수를 설정하는 것이며, DELAY 에 설정되는 값은 ms의 값으로 지연값을 나타낸다.</p>
<h2 id="_3">프로그램 컴파일</h2>
<pre><code class="language-bash">python asmtohex.py led.asm
</code></pre>
<p><img alt="내 사진" src="../imgs/asmtohex.png" /></p>
<p>led.hex 파일을 출력한다.</p>
<h2 id="_4">프로그램 전송</h2>
<p>hexsend.py 을 이용해서 프로그램을 FPGA 로 동작코드를 전송한다.</p>
<pre><code class="language-bash">python hexsend.py led.hex
</code></pre>
<p><img alt="내 사진" src="../imgs/hexsend.png" /></p>
<h2 id="_5">동작상태 확인</h2>
<p>프로그램을 수정하여 컴파일 하여 전송하므로써, 속도, 횟수를 자유롭게 변경하여 프로그램 적용하여 구동할 수 있다.</p>
<p>프로그램을 다운로드 하여 즉시 반영된 동작을 확인한다.</p>
<p><img alt="내 사진" src="../imgs/ledonoff.png" /></p>
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+51
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사용법
1. ASM을 HEX로 변환
python asmtohex.py led.asm
결과:
led.hex
2. HEX를 COM3로 전송
python hexsend.py led.hex
pyserial 설치:
pip install pyserial
명령어 포맷:
16bit = opcode[15:12] + operand[11:0]
명령어:
NOP 0x0
LOAD n 0x1
INC 0x2
DEC 0x3
JMP addr 0x4
JZ addr 0x5
JNZ addr 0x6
LED_ON 0x7
LED_OFF 0x8
DELAY n 0x9
led.asm 변환 결과:
1005
7000
9064
8000
9064
3000
6001
5008
7000
4008
시리얼 전송 바이트:
10 05 70 00 90 64 80 00 90 64 30 00 60 01 50 08 70 00 40 08
+132
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#!/usr/bin/env python3
import sys
from pathlib import Path
OPCODE = {
"NOP": 0x0,
"LOAD": 0x1,
"INC": 0x2,
"DEC": 0x3,
"JMP": 0x4,
"JZ": 0x5,
"JNZ": 0x6,
"LED_ON": 0x7,
"LED_OFF": 0x8,
"DELAY": 0x9,
}
def remove_comment(line):
return line.split(";")[0].strip()
def parse_number(text):
text = text.strip()
if text.lower().startswith("0x"):
return int(text, 16)
if text.lower().startswith("0b"):
return int(text, 2)
return int(text, 10)
def assemble(asm_text):
labels = {}
instructions = []
pc = 0
# 1차 패스: 라벨 주소 수집
for raw_line in asm_text.splitlines():
line = remove_comment(raw_line)
if not line:
continue
if line.endswith(":"):
label = line[:-1].strip()
if label in labels:
raise ValueError(f"중복 라벨: {label}")
labels[label] = pc
continue
if ":" in line:
label_part, inst_part = line.split(":", 1)
label = label_part.strip()
inst_line = inst_part.strip()
if label in labels:
raise ValueError(f"중복 라벨: {label}")
labels[label] = pc
if inst_line:
instructions.append(inst_line)
pc += 1
continue
instructions.append(line)
pc += 1
machine = []
# 2차 패스: 명령어 변환
for addr, line in enumerate(instructions):
parts = line.replace(",", " ").split()
if not parts:
continue
mnemonic = parts[0].upper()
if mnemonic not in OPCODE:
raise ValueError(f"{addr}: 알 수 없는 명령어: {mnemonic}")
opcode = OPCODE[mnemonic]
operand = 0
if len(parts) >= 2:
arg = parts[1]
if arg in labels:
operand = labels[arg]
else:
operand = parse_number(arg)
if operand < 0 or operand > 0x0FFF:
raise ValueError(f"{addr}: operand 범위 초과 0~4095: {operand}")
word = (opcode << 12) | (operand & 0x0FFF)
machine.append(word)
return machine, labels, instructions
def main():
if len(sys.argv) != 2:
print("사용법: python asmtohex.py led.asm")
sys.exit(1)
asm_path = Path(sys.argv[1])
if not asm_path.exists():
print(f"파일 없음: {asm_path}")
sys.exit(1)
hex_path = asm_path.with_suffix(".hex")
asm_text = asm_path.read_text(encoding="utf-8")
machine, labels, instructions = assemble(asm_text)
with hex_path.open("w", encoding="utf-8") as f:
for word in machine:
f.write(f"{word:04X}\n")
print("라벨:")
for name, addr in labels.items():
print(f" {name} = {addr}")
print()
print("기계어:")
for addr, word in enumerate(machine):
print(f" {addr:02d}: {word:04X} ; {instructions[addr]}")
print()
print(f"HEX 생성 완료: {hex_path}")
if __name__ == "__main__":
main()
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#!/usr/bin/env python3
import sys
import time
from pathlib import Path
try:
import serial
except ImportError:
print("pyserial이 필요합니다.")
print("설치: pip install pyserial")
sys.exit(1)
PORT = "COM3"
BAUD = 115200
def read_hex_file(hex_path):
data = bytearray()
for line_no, raw_line in enumerate(hex_path.read_text(encoding="utf-8").splitlines(), start=1):
line = raw_line.split(";")[0].strip()
if not line:
continue
line = line.replace("0x", "").replace("0X", "")
if len(line) != 4:
raise ValueError(f"{line_no}번째 줄 오류: 16비트 HEX 4자리여야 함: {raw_line}")
word = int(line, 16)
high = (word >> 8) & 0xFF
low = word & 0xFF
data.append(high)
data.append(low)
return data
def main():
if len(sys.argv) != 2:
print("사용법: python hexsend.py led.hex")
sys.exit(1)
hex_path = Path(sys.argv[1])
if not hex_path.exists():
print(f"파일 없음: {hex_path}")
sys.exit(1)
send_data = read_hex_file(hex_path)
send_data.append(0xFF)
send_data.append(0xFF)
print(f"파일: {hex_path}")
print(f"전송 바이트 수: {len(send_data)}")
print("전송 데이터:")
print(send_data.hex(" ").upper())
ser = serial.Serial(
port=PORT,
baudrate=BAUD,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=1
)
time.sleep(2)
ser.reset_input_buffer()
ser.reset_output_buffer()
ser.write(send_data)
ser.flush()
ser.close()
print()
print(f"{PORT}, {BAUD}bps 전송 완료")
if __name__ == "__main__":
main()
+18
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@@ -0,0 +1,18 @@
LOAD 1 ; R0 = 5
LOOP:
LED_ON ; LED 켜기
DELAY 300 ; 대기
LED_OFF ; LED 끄기
DELAY 300 ; 대기
DEC ; R0 = R0 - 1
JNZ LOOP ; R0 != 0이면 LOOP로 이동
JZ END_ON ; R0 == 0이면 END_ON으로 이동
END_ON:
LED_ON ; LED 켠 상태 유지
JMP END_ON ; 무한 반복
+10
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@@ -0,0 +1,10 @@
1001
7000
912C
8000
912C
3000
6001
5008
7000
4008
+315
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@@ -0,0 +1,315 @@
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity micom is
port (
clk : in std_logic; -- 50MHz
reset : in std_logic; -- High reset
uart_rx : in std_logic;
led : out std_logic
);
end entity;
architecture rtl of micom is
constant CLK_FREQ : integer := 50000000;
constant BAUD_RATE : integer := 115200;
constant BAUD_CNT : integer := CLK_FREQ / BAUD_RATE;
type ram_type is array (0 to 255) of std_logic_vector(15 downto 0);
signal prog_ram : ram_type := (others => x"0000");
type uart_state_type is (
UART_IDLE,
UART_START,
UART_DATA,
UART_STOP
);
signal uart_state : uart_state_type := UART_IDLE;
signal baud_counter : integer range 0 to BAUD_CNT := 0;
signal bit_index : integer range 0 to 7 := 0;
signal rx_shift : std_logic_vector(7 downto 0) := (others => '0');
signal rx_byte : std_logic_vector(7 downto 0) := (others => '0');
signal rx_valid : std_logic := '0';
signal byte_high : std_logic_vector(7 downto 0) := (others => '0');
signal rx_phase : std_logic := '0';
signal wr_addr : integer range 0 to 255 := 0;
signal cpu_run : std_logic := '0';
type cpu_state_type is (
CPU_LOAD_PROGRAM,
CPU_FETCH,
CPU_DECODE,
CPU_DELAY
);
signal cpu_state : cpu_state_type := CPU_LOAD_PROGRAM;
signal pc : integer range 0 to 255 := 0;
signal inst : std_logic_vector(15 downto 0) := x"0000";
signal opcode : std_logic_vector(3 downto 0);
signal operand : unsigned(11 downto 0);
signal r0 : unsigned(15 downto 0) := (others => '0');
signal zflag : std_logic := '0';
signal delay_counter : unsigned(31 downto 0) := (others => '0');
begin
opcode <= inst(15 downto 12);
operand <= unsigned(inst(11 downto 0));
--------------------------------------------------------------------
-- UART RX
--------------------------------------------------------------------
process(clk, reset)
begin
if reset = '1' then
uart_state <= UART_IDLE;
baud_counter <= 0;
bit_index <= 0;
rx_shift <= (others => '0');
rx_byte <= (others => '0');
rx_valid <= '0';
elsif rising_edge(clk) then
rx_valid <= '0';
case uart_state is
when UART_IDLE =>
if uart_rx = '0' then
baud_counter <= BAUD_CNT / 2;
uart_state <= UART_START;
end if;
when UART_START =>
if baud_counter = 0 then
if uart_rx = '0' then
baud_counter <= BAUD_CNT - 1;
bit_index <= 0;
uart_state <= UART_DATA;
else
uart_state <= UART_IDLE;
end if;
else
baud_counter <= baud_counter - 1;
end if;
when UART_DATA =>
if baud_counter = 0 then
rx_shift(bit_index) <= uart_rx;
baud_counter <= BAUD_CNT - 1;
if bit_index = 7 then
uart_state <= UART_STOP;
else
bit_index <= bit_index + 1;
end if;
else
baud_counter <= baud_counter - 1;
end if;
when UART_STOP =>
if baud_counter = 0 then
rx_byte <= rx_shift;
rx_valid <= '1';
uart_state <= UART_IDLE;
else
baud_counter <= baud_counter - 1;
end if;
end case;
end if;
end process;
--------------------------------------------------------------------
-- Loader
-- 실행 중 새 UART 데이터가 들어오면 자동 초기화 후 재다운로드
--------------------------------------------------------------------
process(clk, reset)
variable word_data : std_logic_vector(15 downto 0);
begin
if reset = '1' then
byte_high <= (others => '0');
rx_phase <= '0';
wr_addr <= 0;
cpu_run <= '0';
elsif rising_edge(clk) then
if rx_valid = '1' then
-- CPU 실행 중 새 데이터가 들어오면 기존 실행 중지 후 재다운로드 시작
if cpu_state /= CPU_LOAD_PROGRAM then
wr_addr <= 0;
rx_phase <= '0';
cpu_run <= '0';
byte_high <= rx_byte;
rx_phase <= '1';
else
if rx_phase = '0' then
byte_high <= rx_byte;
rx_phase <= '1';
else
word_data := byte_high & rx_byte;
if word_data = x"FFFF" then
cpu_run <= '1';
rx_phase <= '0';
else
prog_ram(wr_addr) <= word_data;
if wr_addr < 255 then
wr_addr <= wr_addr + 1;
end if;
rx_phase <= '0';
end if;
end if;
end if;
end if;
end if;
end process;
--------------------------------------------------------------------
-- CPU
--------------------------------------------------------------------
process(clk, reset)
begin
if reset = '1' then
cpu_state <= CPU_LOAD_PROGRAM;
pc <= 0;
inst <= x"0000";
r0 <= (others => '0');
zflag <= '0';
delay_counter <= (others => '0');
led <= '0';
elsif rising_edge(clk) then
-- 실행 중 UART 데이터가 들어오면 CPU를 초기화하고 다운로드 모드로 전환
if rx_valid = '1' and cpu_state /= CPU_LOAD_PROGRAM then
cpu_state <= CPU_LOAD_PROGRAM;
pc <= 0;
inst <= x"0000";
r0 <= (others => '0');
zflag <= '0';
delay_counter <= (others => '0');
led <= '0';
else
case cpu_state is
when CPU_LOAD_PROGRAM =>
if cpu_run = '1' then
pc <= 0;
cpu_state <= CPU_FETCH;
end if;
when CPU_FETCH =>
inst <= prog_ram(pc);
if pc < 255 then
pc <= pc + 1;
end if;
cpu_state <= CPU_DECODE;
when CPU_DECODE =>
case opcode is
when x"0" =>
cpu_state <= CPU_FETCH;
when x"1" =>
r0 <= resize(operand, 16);
if operand = 0 then
zflag <= '1';
else
zflag <= '0';
end if;
cpu_state <= CPU_FETCH;
when x"2" =>
r0 <= r0 + 1;
if r0 + 1 = 0 then
zflag <= '1';
else
zflag <= '0';
end if;
cpu_state <= CPU_FETCH;
when x"3" =>
r0 <= r0 - 1;
if r0 - 1 = 0 then
zflag <= '1';
else
zflag <= '0';
end if;
cpu_state <= CPU_FETCH;
when x"4" =>
pc <= to_integer(operand(7 downto 0));
cpu_state <= CPU_FETCH;
when x"5" =>
if zflag = '1' then
pc <= to_integer(operand(7 downto 0));
end if;
cpu_state <= CPU_FETCH;
when x"6" =>
if zflag = '0' then
pc <= to_integer(operand(7 downto 0));
end if;
cpu_state <= CPU_FETCH;
when x"7" =>
led <= '1';
cpu_state <= CPU_FETCH;
when x"8" =>
led <= '0';
cpu_state <= CPU_FETCH;
when x"9" =>
delay_counter <= to_unsigned(to_integer(operand) * 50000, 32);
cpu_state <= CPU_DELAY;
when others =>
cpu_state <= CPU_FETCH;
end case;
when CPU_DELAY =>
if delay_counter = 0 then
cpu_state <= CPU_FETCH;
else
delay_counter <= delay_counter - 1;
end if;
end case;
end if;
end if;
end process;
end architecture;
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