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Création de la structure du uart fifo

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This commit is contained in:
Gamenight77
2025-05-06 09:42:26 +02:00
parent aaebf22d48
commit 1ca3456ab8
17 changed files with 758 additions and 12 deletions
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3
Semaine_4/UART/README.md Normal file
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# UART
Faire deux modules : un pour l'émetteur et un pour le récepteur. Le module émetteur doit être capable d'envoyer des données sur le port série, tandis que le module récepteur doit être capable de recevoir des données sur le port série. Les deux modules doivent être capables de communiquer entre eux.

39
Semaine_4/UART/src/verilog/top_uart_loopback.v
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@@ -13,7 +13,7 @@ module top_uart_loopback (
wire tx_ready;
initial begin
leds = 6'b000000; // Initialiser les LEDs à 0
leds = 6'b111111;
end
// === UART RX ===
@@ -36,30 +36,49 @@ module top_uart_loopback (
.tx(tx)
);
// === FSM pour déclencher la transmission ===
localparam IDLE = 0, SEND = 1;
reg state = IDLE;
// === FSM avec délai ===
localparam IDLE = 0, WAIT = 1, SEND = 2;
reg [1:0] state = IDLE;
reg [8:0] delay_counter = 0;
always @(posedge clk) begin
leds[5] <= rx;
leds[4] <= tx;
case (state)
IDLE: begin
tx_enable <= 0;
delay_counter <= 0;
if (rx_received && tx_ready) begin
tx_data <= rx_data;
tx_enable <= 1;
state <= SEND;
leds[0] <= 1;
leds[5:1] <= 0;
state <= WAIT;
leds[0] <= 0;
leds[1] <= 1;
end
end
WAIT: begin
delay_counter <= delay_counter + 1;
if (delay_counter == 8'd400 && tx_ready) begin
tx_enable <= 1;
state <= SEND;
end else begin
tx_enable <= 0;
end
leds[0] <= 1;
leds[1] <= 0;
end
SEND: begin
tx_enable <= 0;
state <= IDLE;
leds[0] <= 0; // LED 0 allumée pour indiquer la réception
leds[1] <= 1; // LED 1 éteinte pour indiquer l'attente de transmission
leds[0] <= 0;
leds[1] <= 0; // Envoi terminé
end
endcase
end

2
Semaine_4/UART/src/verilog/uart_tx.v
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@@ -84,7 +84,7 @@ module uart_tx #(
if(rst_p == 1'b1) begin
tx_data_latch <= 8'd0;
end else if(state == IDLE && tx_enable == 1'b1) begin
tx_data_latch <= data; // Charger les données de `data` dans `tx_data_latch`
tx_data_latch <= data; // Charger les données de data dans tx_data_latch
end
end

4
Semaine_4/UART_FIFO/.gitignore vendored Normal file
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runs
.vscode
workspace.code-workspace
*.pyc

19
Semaine_4/UART_FIFO/constraints/top_uart_loopback.cst Normal file
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IO_LOC "rx" 70;
IO_PORT "rx" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "tx" 69;
IO_PORT "tx" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "clk" 4;
IO_PORT "clk" PULL_MODE=UP BANK_VCCIO=1.8;
IO_LOC "leds[0]" 15;
IO_PORT "leds[0]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "leds[1]" 16;
IO_PORT "leds[1]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "leds[2]" 17;
IO_PORT "leds[2]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "leds[3]" 18;
IO_PORT "leds[3]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "leds[4]" 19;
IO_PORT "leds[4]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;
IO_LOC "leds[5]" 20;
IO_PORT "leds[5]" PULL_MODE=UP DRIVE=8 BANK_VCCIO=1.8;

6
Semaine_4/UART_FIFO/project.bat Normal file
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@call c:\oss-cad-suite\environment.bat
@echo off
if "%1"=="sim" call scripts\simulate.bat
if "%1"=="wave" call scripts\gtkwave.bat
if "%1"=="clean" call scripts\clean.bat
if "%1"=="build" call scripts\build.bat

45
Semaine_4/UART_FIFO/scripts/build.bat Normal file
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@echo off
setlocal
rem === Aller à la racine du projet ===
cd /d %~dp0\..
rem === Config de base ===
set DEVICE=GW2AR-LV18QN88C8/I7
set BOARD=tangnano20k
set TOP=top_uart_loopback
set CST_FILE=%TOP%.cst
set JSON_FILE=runs/%TOP%.json
set PNR_JSON=runs/pnr_%TOP%.json
set BITSTREAM=runs/%TOP%.fs
rem === Créer le dossier runs si nécessaire ===
if not exist runs (
mkdir runs
)
echo === Étape 1 : Synthèse avec Yosys ===
yosys -p "read_verilog -sv src/verilog/%TOP%.v src/verilog/uart_rx.v src/verilog/uart_tx.v; synth_gowin -top %TOP% -json %JSON_FILE%"
if errorlevel 1 goto error
echo === Étape 2 : Placement & Routage avec nextpnr-himbaechel ===
nextpnr-himbaechel --json %JSON_FILE% --write %PNR_JSON% --device %DEVICE% --vopt cst=constraints/%CST_FILE% --vopt family=GW2A-18C
if errorlevel 1 goto error
echo === Étape 3 : Packing avec gowin_pack ===
gowin_pack -d %DEVICE% -o %BITSTREAM% %PNR_JSON%
if errorlevel 1 goto error
echo === Étape 4 : Flash avec openFPGALoader ===
openFPGALoader -b %BOARD% %BITSTREAM%
if errorlevel 1 goto error
echo === Compilation et flash réussis ===
goto end
:error
echo === Une erreur est survenue ===
:end
endlocal
pause

4
Semaine_4/UART_FIFO/scripts/clean.bat Normal file
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@@ -0,0 +1,4 @@
@echo off
echo === Nettoyage du dossier runs ===
rd /s /q runs
mkdir runs

3
Semaine_4/UART_FIFO/scripts/gtkwave.bat Normal file
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@echo off
echo === Lancement de GTKWave ===
gtkwave runs/uart.vcd

29
Semaine_4/UART_FIFO/scripts/simulate.bat Normal file
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@echo off
echo === Simulation avec Icarus Verilog ===
setlocal enabledelayedexpansion
:: Dossier de sortie
set OUT=runs/sim.vvp
:: Top-level testbench module
set TOP=tb_uart
:: Répertoires contenant des fichiers .v
set DIRS=src/verilog tests/verilog IP/verilog
:: Variable pour stocker les fichiers
set FILES=
:: Boucle sur chaque dossier
for %%D in (%DIRS%) do (
for %%F in (%%D\*.v) do (
set FILES=!FILES! %%F
)
)
:: Compilation avec Icarus Verilog
iverilog -g2012 -o %OUT% -s %TOP% %FILES%
endlocal
vvp runs/sim.vvp

67
Semaine_4/UART_FIFO/src/verilog/top_uart_loopback_fifo.v Normal file
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module top_uart_loopback (
input wire clk, // 27 MHz
input wire rx,
output wire tx,
output reg [5:0] leds
);
wire rx_received;
wire [7:0] rx_data;
reg [7:0] tx_data;
reg tx_enable;
wire tx_ready;
initial begin
leds = 6'b000000; // Initialiser les LEDs à 0
end
// === UART RX ===
uart_rx uart_rx_inst (
.clk(clk),
.rst_p(1'b0),
.rx_pin(rx),
.rx_received(rx_received),
.rx_enable(1'b1),
.rx_data(rx_data)
);
// === UART TX ===
uart_tx uart_tx_inst (
.clk(clk),
.rst_p(1'b0),
.data(tx_data),
.tx_enable(tx_enable),
.tx_ready(tx_ready),
.tx(tx)
);
// === FSM pour déclencher la transmission ===
localparam IDLE = 0, SEND = 1;
reg state = IDLE;
always @(posedge clk) begin
leds[5] <= rx;
case (state)
IDLE: begin
tx_enable <= 0;
if (rx_received && tx_ready) begin
tx_data <= rx_data;
tx_enable <= 1;
state <= SEND;
leds[0] <= 1;
leds[5:1] <= 0;
end
end
SEND: begin
tx_enable <= 0;
state <= IDLE;
leds[0] <= 0; // LED 0 allumée pour indiquer la réception
leds[1] <= 1; // LED 1 éteinte pour indiquer l'attente de transmission
end
endcase
end
endmodule

145
Semaine_4/UART_FIFO/src/verilog/uart_rx_fifo.v Normal file
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@@ -0,0 +1,145 @@
module uart_rx #(
parameter CLK_FREQ = 27_000_000,
parameter BAUD_RATE = 115200
)(
input clk, //clock input
input rst_p, //asynchronous reset input, high active
input rx_enable, //data receiver module ready
input rx_pin, //serial data input
output reg[7:0] rx_data, //received serial data
output reg rx_received //received serial data is valid
);
localparam CYCLE = CLK_FREQ / BAUD_RATE;
//state machine code
localparam S_IDLE = 1;
localparam S_START = 2; //start bit
localparam S_REC_BYTE = 3; //data bits
localparam S_STOP = 4; //stop bit
localparam S_DATA = 5;
reg[2:0] state;
reg[2:0] next_state;
reg rx_d0; //delay 1 clock for rx_pin
reg rx_d1; //delay 1 clock for rx_d0
wire rx_negedge; //negedge of rx_pin
reg[7:0] rx_bits; //temporary storage of received data
reg[15:0] cycle_cnt; //baud counter
reg[2:0] bit_cnt; //bit counter
assign rx_negedge = rx_d1 && ~rx_d0; // Front déscendant
always@(posedge clk or posedge rst_p) // Filtrage du signial
begin
if(rst_p == 1'b1)begin
rx_d0 <= 1'b0;
rx_d1 <= 1'b0;
end else begin
rx_d0 <= rx_pin;
rx_d1 <= rx_d0;
end
end
always@(posedge clk or posedge rst_p)begin // Compteur d'etat
if(rst_p == 1'b1)
state <= S_IDLE;
else
state <= next_state;
end
always@(*)begin
case(state)
S_IDLE:
if(rx_negedge) // Detection du start bit
next_state = S_START;
else
next_state = S_IDLE;
S_START:
if(cycle_cnt == CYCLE - 1) //one data cycle
next_state = S_REC_BYTE;
else
next_state = S_START;
S_REC_BYTE:
if(cycle_cnt == CYCLE - 1 && bit_cnt == 3'd7) //receive 8bit data
next_state = S_STOP;
else
next_state = S_REC_BYTE;
S_STOP:
if(cycle_cnt == CYCLE/2 - 1) //half bit cycle,to avoid missing the next byte receiver
next_state = S_DATA;
else
next_state = S_STOP;
S_DATA:
if(rx_enable) //data receive complete
next_state = S_IDLE;
else
next_state = S_DATA;
default:
next_state = S_IDLE;
endcase
end
always@(posedge clk or posedge rst_p)
begin
if(rst_p == 1'b1)
rx_received <= 1'b0;
else if(state == S_STOP && next_state != state)
rx_received <= 1'b1;
else if(state == S_DATA && rx_enable)
rx_received <= 1'b0;
end
always@(posedge clk or posedge rst_p)
begin
if(rst_p == 1'b1)
rx_data <= 8'd0;
else if(state == S_STOP && next_state != state)
rx_data <= rx_bits;//latch received data
end
always@(posedge clk or posedge rst_p)
begin
if(rst_p == 1'b1)
begin
bit_cnt <= 3'd0;
end
else if(state == S_REC_BYTE)
if(cycle_cnt == CYCLE - 1)
bit_cnt <= bit_cnt + 3'd1;
else
bit_cnt <= bit_cnt;
else
bit_cnt <= 3'd0;
end
always@(posedge clk or posedge rst_p)
begin
if(rst_p == 1'b1)
cycle_cnt <= 16'd0;
else if((state == S_REC_BYTE && cycle_cnt == CYCLE - 1) || next_state != state)
cycle_cnt <= 16'd0;
else
cycle_cnt <= cycle_cnt + 16'd1;
end
//receive serial data bit data
always@(posedge clk or posedge rst_p)
begin
if(rst_p == 1'b1)
rx_bits <= 8'd0;
else if(state == S_REC_BYTE && cycle_cnt == CYCLE/2 - 1)
rx_bits[bit_cnt] <= rx_pin;
else
rx_bits <= rx_bits;
end
endmodule

131
Semaine_4/UART_FIFO/src/verilog/uart_tx_fifo.v Normal file
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@@ -0,0 +1,131 @@
module uart_tx #(
parameter CLK_FREQ = 27_000_000,
parameter BAUD_RATE = 115200
)(
input wire clk,
input wire rst_p,
input wire[7:0] data,
input wire tx_enable,
output reg tx_ready,
output wire tx
);
localparam CYCLE = CLK_FREQ / BAUD_RATE;
localparam IDLE = 2'd0;
localparam START = 2'd1;
localparam DATA = 2'd2;
localparam STOP = 2'd3;
reg [1:0] state = IDLE;
reg [1:0] next_state;
reg [15:0] cycle_cnt; //baud counter
reg tx_reg;
reg [2:0] bit_cnt;
reg [7:0] tx_data_latch = 0;
assign tx = tx_reg;
always@(posedge clk or posedge rst_p)begin // Avance d'etat
if(rst_p == 1'b1)
state <= IDLE;
else
state <= next_state;
end
always@(*) begin
case(state)
IDLE:
if(tx_enable == 1'b1)
next_state = START;
else
next_state = IDLE;
START:
if(cycle_cnt == CYCLE - 1)
next_state = DATA;
else
next_state = START;
DATA:
if(cycle_cnt == CYCLE - 1 && bit_cnt == 3'd7)
next_state = STOP;
else
next_state = DATA;
STOP:
if(cycle_cnt == CYCLE - 1)
next_state = IDLE;
else
next_state = STOP;
default:
next_state = IDLE;
endcase
end
always@(posedge clk or posedge rst_p)begin // tx_ready block
if(rst_p == 1'b1)
tx_ready <= 1'b0; // Reset
else if(state == IDLE && tx_enable == 1'b1)
tx_ready <= 1'b0; // Pas prêt tant que les données sont valides
else if(state == IDLE)
tx_ready <= 1'b1;
else if(state == STOP && cycle_cnt == CYCLE - 1)
tx_ready <= 1'b1; // Prêt une fois le bit STOP envoyé
else
tx_ready <= tx_ready; // Reste inchangé dans d'autres cas
end
always@(posedge clk or posedge rst_p) begin // tx_data_latch block
if(rst_p == 1'b1) begin
tx_data_latch <= 8'd0;
end else if(state == IDLE && tx_enable == 1'b1) begin
tx_data_latch <= data; // Charger les données de `data` dans `tx_data_latch`
end
end
always@(posedge clk or posedge rst_p)begin // DATA bit_cnt block
if(rst_p == 1'b1)begin
bit_cnt <= 3'd0;
end else if(state == DATA)
if(cycle_cnt == CYCLE - 1)
bit_cnt <= bit_cnt + 3'd1;
else
bit_cnt <= bit_cnt;
else
bit_cnt <= 3'd0;
end
always@(posedge clk or posedge rst_p)begin // Cycle counter
if(rst_p == 1'b1)
cycle_cnt <= 16'd0;
else if((state == DATA && cycle_cnt == CYCLE - 1) || next_state != state)
cycle_cnt <= 16'd0;
else
cycle_cnt <= cycle_cnt + 16'd1;
end
always@(posedge clk or posedge rst_p)begin // tx state managment
if(rst_p == 1'b1)
tx_reg <= 1'b1;
else
case(state)
IDLE,STOP:
tx_reg <= 1'b1;
START:
tx_reg <= 1'b0;
DATA:
tx_reg <= tx_data_latch[bit_cnt]; // SENDING BYTE HERE
default:
tx_reg <= 1'b1;
endcase
end
endmodule

43
Semaine_4/UART_FIFO/tests/Python/uart_loopback_test.py Normal file
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import serial
import time
# À adapter selon ton système
PORT = 'COM7' # ex: COM3 sur Windows ou /dev/ttyUSB0 sur Linux
BAUDRATE = 115200
TIMEOUT = 3 # en secondes
def main():
try:
with serial.Serial(PORT, BAUDRATE, timeout=TIMEOUT) as ser:
print(f"[INFO] Connecté à {PORT} à {BAUDRATE} bauds.")
print("Tape un nombre entre 0 et 255. Ctrl+C pour quitter.\n")
while True:
user_input = input("Nombre à envoyer (0-255) : ")
if not user_input.isdigit():
print("⚠️ Entrée invalide. Tape un entier entre 0 et 255.")
continue
value = int(user_input)
if value < 0 or value >= 255:
print("⚠️ Valeur hors limites.")
continue
byte = bytes([value])
ser.write(byte)
print(f"[TX] Envoyé : {value} (0x{value:02X})")
time.sleep(0.01) # petite pause si nécessaire
rx = ser.read(1)
if rx:
print(f"[RX] Reçu : {int.from_bytes(rx, 'little')} (0x{rx.hex()})\n")
else:
print("⚠️ Aucun octet reçu (timeout ?)\n")
except serial.SerialException as e:
print(f"[ERREUR] Port série : {e}")
if __name__ == "__main__":
main()

84
Semaine_4/UART_FIFO/tests/verilog/tb_uart_fifo.v Normal file
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`timescale 1ns/1ps
module tb_uart;
reg clk = 0;
reg tx_enable = 0;
reg tx_ready;
reg [7:0] data_in = 8'h00;
reg [7:0] data_out;
reg rx_received;
wire rx_enable = 1'b1;
wire pin;
always #18.5 clk = ~clk;
localparam CLK_FREQ = 27_000_000;
localparam BAUD_RATE = 115_200;
uart_rx #(
.CLK_FREQ(CLK_FREQ),
.BAUD_RATE(BAUD_RATE)
) rx_instance (
.clk(clk),
.rx_pin(pin),
.rx_data(data_out),
.rx_received(rx_received),
.rx_enable(rx_enable)
);
uart_tx #(
.CLK_FREQ(CLK_FREQ),
.BAUD_RATE(BAUD_RATE)
)tx_instance (
.clk(clk),
.tx_enable(tx_enable),
.tx_ready(tx_ready),
.data(data_in),
.tx(pin),
.rst_p(1'b0)
);
initial begin
$dumpfile("runs/uart.vcd");
$dumpvars(0, tb_uart);
$display("======== Start UART LOOPBACK test =========");
#100;
data_in <= 8'd234; // 234
tx_enable <= 1;
wait(tx_ready == 1'b0);
tx_enable <= 0;
// Attendre
wait (rx_received == 1'b1); // Attendre que le signal de reception soit actif
$display("Data received: %d", data_out); // Afficher la valeur recu
$display("Data expected: %d", data_in); // Afficher la valeur envoyee
#1000;
wait(tx_ready == 1'b1); // Attendre que le signal de reception soit actif
data_in <= 8'd202; // 202
tx_enable <= 1;
wait(tx_ready == 1'b0);
tx_enable <= 0;
// Attendre
wait (rx_received == 1'b1); // Attendre que le signal de reception soit actif
$display("Data received: %d", data_out); // Afficher la valeur recu
$display("Data expected: %d", data_in); // Afficher la valeur envoyee
$display("======== END UART TX test =========");
#1000;
$stop;
end
endmodule

67
Semaine_4/UART_FIFO/tests/verilog/tb_uart_rx_fifo.v Normal file
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@@ -0,0 +1,67 @@
`timescale 1ns / 1ps
module tb_uart_rx;
reg clk = 0;
reg rx;
reg [7:0] data_in;
reg [7:0] data_out;
reg tx_data_valid;
reg tx_data_ready;
reg rx_received;
wire rx_enable = 1'b1; // Enable the receiver
localparam CLK_FREQ = 27_000_000;
localparam BAUD_RATE = 115_200;
localparam BIT_PERIOD = CLK_FREQ / BAUD_RATE;
localparam CLK_PERIOD_NS = 1000000000 / CLK_FREQ;
other_uart_tx tx_instance (
.clk(clk),
.tx_pin(rx),
.tx_data(data_in),
.tx_data_valid(tx_data_valid),
.tx_data_ready(tx_data_ready),
.rst_n(1'b1)
);
uart_rx #(
.CLK_FREQ(CLK_FREQ),
.BAUD_RATE(BAUD_RATE)
) rx_instance (
.clk(clk),
.rx_pin(rx),
.rx_data(data_out),
.rx_received(rx_received),
.rx_enable(rx_enable)
);
always #(CLK_PERIOD_NS/2) clk = ~clk;
initial begin
$dumpfile("runs/uart_rx.vcd");
$dumpvars(0, tb_uart_rx);
$display("======== Start UART RX test =========");
#100;
data_in = 8'd123; // Data to send
wait(tx_data_ready); // Wait for the transmitter to be ready
#1; // Small delay to ensure the data is latched
tx_data_valid = 1'b1; // Indicate that the data is valid
wait(tx_data_ready == 0);
tx_data_valid = 1'b0; // Clear the valid signal
wait(rx_received); // Wait for the receiver to receive the data
$display("Data sent: %d", data_in);
$display("Data received: %d", data_out); // Display the received data
$display("======== END UART RX test =========");
$finish;
end
endmodule

77
Semaine_4/UART_FIFO/tests/verilog/tb_uart_tx_fifo.v Normal file
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`timescale 1ns/1ps
module tb_uart_tx;
reg clk = 0;
reg tx_enable = 0;
reg [7:0] data_in = 8'h00;
reg [7:0] data_out;
wire tx;
reg tx_ready;
wire rx_recieved;
always #18.5 clk = ~clk;
other_uart_rx rx_instance(
.clk(clk),
.rx_pin(tx), // tx is connected to rx for testing
.rst_n(1'b1),
.rx_data(data_out),
.rx_data_valid(rx_recieved),
.rx_data_ready(1'b1)
);
uart_tx #(
.CLK_FREQ(27_000_000),
.BAUD_RATE(115_200)
)tx_instance (
.clk(clk),
.tx_enable(tx_enable),
.tx_ready(tx_ready),
.data(data_in),
.tx(tx),
.rst_p(1'b0)
);
initial begin
$dumpfile("runs/uart_tx.vcd");
$dumpvars(0, tb_uart_tx);
$display("======== Start UART TX test =========");
#100;
data_in <= 8'd234; // 234
tx_enable <= 1;
wait(tx_ready == 1'b0);
tx_enable <= 0;
// Attendre
wait (rx_recieved == 1'b1); // Attendre que le signal de reception soit actif
$display("Data received: %d", data_out); // Afficher la valeur recu
$display("Data expected: %d", data_in); // Afficher la valeur envoyee
#1000;
wait(tx_ready == 1'b1); // Attendre que le signal de reception soit actif
data_in <= 8'd202; // 202
tx_enable <= 1;
wait(tx_ready == 1'b0);
tx_enable <= 0;
// Attendre
wait (rx_recieved == 1'b1); // Attendre que le signal de reception soit actif
$display("Data received: %d", data_out); // Afficher la valeur recu
$display("Data expected: %d", data_in); // Afficher la valeur envoyee
$display("======== END UART TX test =========");
#1000;
$stop;
end
endmodule