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Bloquer a cause du tx

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This commit is contained in:
Gamenight77
2025-05-13 12:22:50 +02:00
parent d1f907f7b6
commit e124c7c0c4
9 changed files with 523 additions and 37 deletions
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2
Semaine_4/UART_FIFO/IP/verilog/fifo.v
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@@ -34,8 +34,8 @@
end
if (rd_en && !empty) begin // OUT
rd_ptr <= (rd_ptr + 1) % SIZE;
rd_data <= fifo[rd_ptr];
rd_ptr <= (rd_ptr + 1) % SIZE;
count <= count - 1;
end
end

472
Semaine_4/UART_FIFO/IP/verilog/txuartlite.v Normal file
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@@ -0,0 +1,472 @@
////////////////////////////////////////////////////////////////////////////////
//
// Filename: txuartlite.v
// {{{
// Project: wbuart32, a full featured UART with simulator
//
// Purpose: Transmit outputs over a single UART line. This particular UART
// implementation has been extremely simplified: it does not handle
// generating break conditions, nor does it handle anything other than the
// 8N1 (8 data bits, no parity, 1 stop bit) UART sub-protocol.
//
// To interface with this module, connect it to your system clock, and
// pass it the byte of data you wish to transmit. Strobe the i_wr line
// high for one cycle, and your data will be off. Wait until the 'o_busy'
// line is low before strobing the i_wr line again--this implementation
// has NO BUFFER, so strobing i_wr while the core is busy will just
// get ignored. The output will be placed on the o_txuart output line.
//
// (I often set both data and strobe on the same clock, and then just leave
// them set until the busy line is low. Then I move on to the next piece
// of data.)
//
// Creator: Dan Gisselquist, Ph.D.
// Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
// }}}
// Copyright (C) 2015-2024, Gisselquist Technology, LLC
// {{{
// This program is free software (firmware): 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 MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory. Run make with no
// target there if the PDF file isn't present.) If not, see
// <http://www.gnu.org/licenses/> for a copy.
// }}}
// License: GPL, v3, as defined and found on www.gnu.org,
// {{{
// http://www.gnu.org/licenses/gpl.html
//
////////////////////////////////////////////////////////////////////////////////
//
`default_nettype none
// }}}
module txuartlite #(
// {{{
// TIMING_BITS -- the number of bits required to represent
// the number of clocks per baud. 24 should be sufficient for
// most baud rates, but you can trim it down to save logic if
// you would like. TB is just an abbreviation for TIMING_BITS.
parameter [4:0] TIMING_BITS = 5'd8,
localparam TB = TIMING_BITS,
// CLOCKS_PER_BAUD -- the number of system clocks per baud
// interval.
parameter [(TB-1):0] CLOCKS_PER_BAUD = 234 // 24'd868
// }}}
) (
// {{{
input wire i_clk, i_reset,
input wire i_wr,
input wire [7:0] i_data,
// And the UART input line itself
output reg o_uart_tx,
// A line to tell others when we are ready to accept data. If
// (i_wr)&&(!o_busy) is ever true, then the core has accepted
// a byte for transmission.
output wire o_busy
// }}}
);
// Register/net declarations
// {{{
localparam [3:0] TXUL_BIT_ZERO = 4'h0,
// TXUL_BIT_ONE = 4'h1,
// TXUL_BIT_TWO = 4'h2,
// TXUL_BIT_THREE = 4'h3,
// TXUL_BIT_FOUR = 4'h4,
// TXUL_BIT_FIVE = 4'h5,
// TXUL_BIT_SIX = 4'h6,
// TXUL_BIT_SEVEN = 4'h7,
TXUL_STOP = 4'h8,
TXUL_IDLE = 4'hf;
reg [(TB-1):0] baud_counter;
reg [3:0] state;
reg [7:0] lcl_data;
reg r_busy, zero_baud_counter;
// }}}
// Big state machine controlling: r_busy, state
// {{{
//
initial r_busy = 1'b1;
initial state = TXUL_IDLE;
always @(posedge i_clk)
if (i_reset)
begin
r_busy <= 1'b1;
state <= TXUL_IDLE;
end else if (!zero_baud_counter)
// r_busy needs to be set coming into here
r_busy <= 1'b1;
else if (state > TXUL_STOP) // STATE_IDLE
begin
state <= TXUL_IDLE;
r_busy <= 1'b0;
if ((i_wr)&&(!r_busy))
begin // Immediately start us off with a start bit
r_busy <= 1'b1;
state <= TXUL_BIT_ZERO;
end
end else begin
// One clock tick in each of these states ...
r_busy <= 1'b1;
if (state <=TXUL_STOP) // start bit, 8-d bits, stop-b
state <= state + 1'b1;
else
state <= TXUL_IDLE;
end
// }}}
// o_busy
// {{{
//
// This is a wire, designed to be true is we are ever busy above.
// originally, this was going to be true if we were ever not in the
// idle state. The logic has since become more complex, hence we have
// a register dedicated to this and just copy out that registers value.
assign o_busy = (r_busy);
// }}}
// lcl_data
// {{{
//
// This is our working copy of the i_data register which we use
// when transmitting. It is only of interest during transmit, and is
// allowed to be whatever at any other time. Hence, if r_busy isn't
// true, we can always set it. On the one clock where r_busy isn't
// true and i_wr is, we set it and r_busy is true thereafter.
// Then, on any zero_baud_counter (i.e. change between baud intervals)
// we simple logically shift the register right to grab the next bit.
initial lcl_data = 8'hff;
always @(posedge i_clk)
if (i_reset)
lcl_data <= 8'hff;
else if (i_wr && !r_busy)
lcl_data <= i_data;
else if (zero_baud_counter)
lcl_data <= { 1'b1, lcl_data[7:1] };
// }}}
// o_uart_tx
// {{{
//
// This is the final result/output desired of this core. It's all
// centered about o_uart_tx. This is what finally needs to follow
// the UART protocol.
//
initial o_uart_tx = 1'b1;
always @(posedge i_clk)
if (i_reset)
o_uart_tx <= 1'b1;
else if (i_wr && !r_busy)
o_uart_tx <= 1'b0; // Set the start bit on writes
else if (zero_baud_counter) // Set the data bit.
o_uart_tx <= lcl_data[0];
// }}}
// Baud counter
// {{{
// All of the above logic is driven by the baud counter. Bits must last
// CLOCKS_PER_BAUD in length, and this baud counter is what we use to
// make certain of that.
//
// The basic logic is this: at the beginning of a bit interval, start
// the baud counter and set it to count CLOCKS_PER_BAUD. When it gets
// to zero, restart it.
//
// However, comparing a 28'bit number to zero can be rather complex--
// especially if we wish to do anything else on that same clock. For
// that reason, we create "zero_baud_counter". zero_baud_counter is
// nothing more than a flag that is true anytime baud_counter is zero.
// It's true when the logic (above) needs to step to the next bit.
// Simple enough?
//
// I wish we could stop there, but there are some other (ugly)
// conditions to deal with that offer exceptions to this basic logic.
//
// 1. When the user has commanded a BREAK across the line, we need to
// wait several baud intervals following the break before we start
// transmitting, to give any receiver a chance to recognize that we are
// out of the break condition, and to know that the next bit will be
// a stop bit.
//
// 2. A reset is similar to a break condition--on both we wait several
// baud intervals before allowing a start bit.
//
// 3. In the idle state, we stop our counter--so that upon a request
// to transmit when idle we can start transmitting immediately, rather
// than waiting for the end of the next (fictitious and arbitrary) baud
// interval.
//
// When (i_wr)&&(!r_busy)&&(state == TXUL_IDLE) then we're not only in
// the idle state, but we also just accepted a command to start writing
// the next word. At this point, the baud counter needs to be reset
// to the number of CLOCKS_PER_BAUD, and zero_baud_counter set to zero.
//
// The logic is a bit twisted here, in that it will only check for the
// above condition when zero_baud_counter is false--so as to make
// certain the STOP bit is complete.
initial zero_baud_counter = 1'b1;
initial baud_counter = 0;
always @(posedge i_clk)
if (i_reset)
begin
zero_baud_counter <= 1'b1;
baud_counter <= 0;
end else begin
zero_baud_counter <= (baud_counter == 1);
if (state == TXUL_IDLE)
begin
baud_counter <= 0;
zero_baud_counter <= 1'b1;
if ((i_wr)&&(!r_busy))
begin
baud_counter <= CLOCKS_PER_BAUD - 1'b1;
zero_baud_counter <= 1'b0;
end
end else if (!zero_baud_counter)
baud_counter <= baud_counter - 1'b1;
else if (state > TXUL_STOP)
begin
baud_counter <= 0;
zero_baud_counter <= 1'b1;
end else if (state == TXUL_STOP)
// Need to complete this state one clock early, so
// we can release busy one clock before the stop bit
// is complete, so we can start on the next byte
// exactly 10*CLOCKS_PER_BAUD clocks after we started
// the last one
baud_counter <= CLOCKS_PER_BAUD - 2;
else // All other states
baud_counter <= CLOCKS_PER_BAUD - 1'b1;
end
// }}}
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// FORMAL METHODS
// {{{
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
`ifdef FORMAL
// Declarations
`ifdef TXUARTLITE
`define ASSUME assume
`else
`define ASSUME assert
`endif
reg f_past_valid, f_last_clk;
reg [(TB-1):0] f_baud_count;
reg [9:0] f_txbits;
reg [3:0] f_bitcount;
reg [7:0] f_request_tx_data;
wire [3:0] subcount;
// Setup
// {{{
initial f_past_valid = 1'b0;
always @(posedge i_clk)
f_past_valid <= 1'b1;
initial `ASSUME(!i_wr);
always @(posedge i_clk)
if ((f_past_valid)&&($past(i_wr))&&($past(o_busy)))
begin
`ASSUME(i_wr == $past(i_wr));
`ASSUME(i_data == $past(i_data));
end
// }}}
// Check the baud counter
// {{{
always @(posedge i_clk)
assert(zero_baud_counter == (baud_counter == 0));
always @(posedge i_clk)
if (f_past_valid && !$past(i_reset) && $past(baud_counter != 0)
&& $past(state != TXUL_IDLE))
assert(baud_counter == $past(baud_counter - 1'b1));
always @(posedge i_clk)
if (f_past_valid && !$past(i_reset) && !$past(zero_baud_counter)
&& $past(state != TXUL_IDLE))
assert($stable(o_uart_tx));
initial f_baud_count = 1'b0;
always @(posedge i_clk)
if (zero_baud_counter)
f_baud_count <= 0;
else
f_baud_count <= f_baud_count + 1'b1;
always @(posedge i_clk)
assert(f_baud_count < CLOCKS_PER_BAUD);
always @(posedge i_clk)
if (baud_counter != 0)
assert(o_busy);
// }}}
// {{{
initial f_txbits = 0;
always @(posedge i_clk)
if (zero_baud_counter)
f_txbits <= { o_uart_tx, f_txbits[9:1] };
always @(posedge i_clk)
if (f_past_valid && !$past(i_reset)&& !$past(zero_baud_counter)
&& !$past(state==TXUL_IDLE))
assert(state == $past(state));
initial f_bitcount = 0;
always @(posedge i_clk)
if ((!f_past_valid)||(!$past(f_past_valid)))
f_bitcount <= 0;
else if ((state == TXUL_IDLE)&&(zero_baud_counter))
f_bitcount <= 0;
else if (zero_baud_counter)
f_bitcount <= f_bitcount + 1'b1;
always @(posedge i_clk)
assert(f_bitcount <= 4'ha);
always @(*)
if (!o_busy)
assert(zero_baud_counter);
always @(posedge i_clk)
if ((i_wr)&&(!o_busy))
f_request_tx_data <= i_data;
assign subcount = 10-f_bitcount;
always @(posedge i_clk)
if (f_bitcount > 0)
assert(!f_txbits[subcount]);
always @(posedge i_clk)
if (f_bitcount == 4'ha)
begin
assert(f_txbits[8:1] == f_request_tx_data);
assert( f_txbits[9]);
end
always @(posedge i_clk)
assert((state <= TXUL_STOP + 1'b1)||(state == TXUL_IDLE));
always @(posedge i_clk)
if ((f_past_valid)&&($past(f_past_valid))&&($past(o_busy)))
cover(!o_busy);
// }}}
`endif // FORMAL
`ifdef VERIFIC_SVA
reg [7:0] fsv_data;
//
// Grab a copy of the data any time we are sent a new byte to transmit
// We'll use this in a moment to compare the item transmitted against
// what is supposed to be transmitted
//
always @(posedge i_clk)
if ((i_wr)&&(!o_busy))
fsv_data <= i_data;
//
// One baud interval
// {{{
//
// 1. The UART output is constant at DAT
// 2. The internal state remains constant at ST
// 3. CKS = the number of clocks per bit.
//
// Everything stays constant during the CKS clocks with the exception
// of (zero_baud_counter), which is *only* raised on the last clock
// interval
sequence BAUD_INTERVAL(CKS, DAT, SR, ST);
((o_uart_tx == DAT)&&(state == ST)
&&(lcl_data == SR)
&&(!zero_baud_counter))[*(CKS-1)]
##1 (o_uart_tx == DAT)&&(state == ST)
&&(lcl_data == SR)
&&(zero_baud_counter);
endsequence
// }}}
//
// One byte transmitted
// {{{
//
// DATA = the byte that is sent
// CKS = the number of clocks per bit
//
sequence SEND(CKS, DATA);
BAUD_INTERVAL(CKS, 1'b0, DATA, 4'h0)
##1 BAUD_INTERVAL(CKS, DATA[0], {{(1){1'b1}},DATA[7:1]}, 4'h1)
##1 BAUD_INTERVAL(CKS, DATA[1], {{(2){1'b1}},DATA[7:2]}, 4'h2)
##1 BAUD_INTERVAL(CKS, DATA[2], {{(3){1'b1}},DATA[7:3]}, 4'h3)
##1 BAUD_INTERVAL(CKS, DATA[3], {{(4){1'b1}},DATA[7:4]}, 4'h4)
##1 BAUD_INTERVAL(CKS, DATA[4], {{(5){1'b1}},DATA[7:5]}, 4'h5)
##1 BAUD_INTERVAL(CKS, DATA[5], {{(6){1'b1}},DATA[7:6]}, 4'h6)
##1 BAUD_INTERVAL(CKS, DATA[6], {{(7){1'b1}},DATA[7:7]}, 4'h7)
##1 BAUD_INTERVAL(CKS, DATA[7], 8'hff, 4'h8)
##1 BAUD_INTERVAL(CKS-1, 1'b1, 8'hff, 4'h9);
endsequence
// }}}
//
// Transmit one byte
// {{{
// Once the byte is transmitted, make certain we return to
// idle
//
assert property (
@(posedge i_clk)
(i_wr)&&(!o_busy)
|=> ((o_busy) throughout SEND(CLOCKS_PER_BAUD,fsv_data))
##1 (!o_busy)&&(o_uart_tx)&&(zero_baud_counter));
// }}}
// {{{
assume property (
@(posedge i_clk)
(i_wr)&&(o_busy) |=>
(i_wr)&&($stable(i_data)));
//
// Make certain that o_busy is true any time zero_baud_counter is
// non-zero
//
always @(*)
assert((o_busy)||(zero_baud_counter) );
// If and only if zero_baud_counter is true, baud_counter must be zero
// Insist on that relationship here.
always @(*)
assert(zero_baud_counter == (baud_counter == 0));
// To make certain baud_counter stays below CLOCKS_PER_BAUD
always @(*)
assert(baud_counter < CLOCKS_PER_BAUD);
//
// Insist that we are only ever in a valid state
always @(*)
assert((state <= TXUL_STOP+1'b1)||(state == TXUL_IDLE));
// }}}
`endif // Verific SVA
// }}}
endmodule

2
Semaine_4/UART_FIFO/scripts/gtkwave.bat
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@@ -1,3 +1,3 @@
@echo off
echo === Lancement de GTKWave ===
gtkwave runs/uart_fifo.vcd
gtkwave runs/uart_tx_fifo.vcd

2
Semaine_4/UART_FIFO/scripts/simulate.bat
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@@ -6,7 +6,7 @@ setlocal enabledelayedexpansion
set OUT=runs/sim.vvp
:: Top-level testbench module
set TOP=tb_uart_fifo
set TOP=tb_uart_tx_fifo
:: Répertoires contenant des fichiers .v
set DIRS=src/verilog tests/verilog IP/verilog

35
Semaine_4/UART_FIFO/src/verilog/uart_tx_fifo.v
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@@ -16,7 +16,7 @@ module uart_tx_fifo #(
reg fifo_rd_en;
// UART wires
wire tx_ready;
wire tx_busy;
reg uart_tx_enable;
reg [7:0] uart_tx_data;
@@ -24,6 +24,7 @@ module uart_tx_fifo #(
typedef enum logic [1:0] {
IDLE,
WAIT_READY,
READ_FIFO,
SEND
} state_t;
@@ -44,39 +45,39 @@ module uart_tx_fifo #(
);
// UART TX instantiation
uart_tx #(
.CLK_FREQ(CLK_FREQ),
.BAUD_RATE(BAUD_RATE)
) uart_tx_inst (
.clk(clk),
.rst_p(1'b0),
.data(uart_tx_data),
.tx_enable(uart_tx_enable),
.tx_ready(tx_ready),
.tx(tx_pin)
txuartlite uart_tx_inst (
.i_clk(clk),
.i_reset(1'b0),
.i_wr(uart_tx_enable),
.i_data(uart_tx_data),
.o_uart_tx(tx_pin),
.o_busy(tx_busy)
);
always_ff @(posedge clk) begin
// Valeurs par défaut
fifo_rd_en <= 0;
uart_tx_enable <= 0;
case (state)
IDLE: begin
if (!fifo_empty) begin
if (!fifo_empty)
state <= WAIT_READY;
end
end
WAIT_READY: begin
if (tx_ready) begin
if (!tx_busy) begin
fifo_rd_en <= 1;
state <= SEND;
state <= READ_FIFO;
end
end
SEND: begin
READ_FIFO: begin
// fifo_rd_data sera valide ici
uart_tx_data <= fifo_rd_data;
state <= SEND;
end
SEND: begin
uart_tx_enable <= 1;
state <= IDLE;
end

2
Semaine_4/UART_FIFO/tests/verilog/tb_uart_rx_fifo.v
View File

@@ -30,7 +30,7 @@ module tb_uart_rx_fifo;
uart_rx_fifo #(
.CLK_FREQ(CLK_FREQ),
.BAUD_RATE(BAUD_RATE),
.FIFO_DEPTH(8)
.FIFO_SIZE(8)
) rx_fifo_instance (
.clk(clk),
.rx_pin(rx),

27
Semaine_4/UART_FIFO/tests/verilog/tb_uart_tx_fifo.v
View File

@@ -14,19 +14,22 @@ module tb_uart_tx_fifo;
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 RX wires
wire [7:0] rx_data;
wire rx_received;
rxuartlite uart_rx_inst (
.i_clk(clk),
.i_reset(1'b0),
.i_uart_rx(tx),
.o_wr(rx_received),
.o_data(rx_data)
);
uart_tx_fifo #(
.CLK_FREQ(27_000_000),
.BAUD_RATE(115_200),
.FIFO_DEPTH(8)
.FIFO_SIZE(8)
)tx_fifo_instance (
.clk(clk),
.wr_en(wr_en),
@@ -43,21 +46,23 @@ module tb_uart_tx_fifo;
#50;
data_in <= 8'd234;
data_in <= 8'h23;
wr_en <= 1'b1; // Activer l'écriture dans la FIFO
#37;
wr_en <= 1'b0; // Désactiver l'écriture dans la FIFO
data_in <= 8'd123;
/**/data_in <= 8'h75;
wr_en <= 1'b1; // Activer l'écriture dans la FIFO
#37;
wr_en <= 1'b0; // Désactiver l'écriture dans la FIFO
data_in <= 8'd45;
data_in <= 8'hff;
wr_en <= 1'b1; // Activer l'écriture dans la FIFO
#37;
wr_en <= 1'b0; // Désactiver l'écriture dans la FIFO
#5000
$display("======== END UART TX FIFO test =========");
#1000000;

1
Semaine_5/UART_ULTRASON_COMMANDS/.gitignore vendored
View File

@@ -2,3 +2,4 @@ runs
.vscode
workspace.code-workspace
*.pyc
.idea

17
Semaine_5/UART_ULTRASON_COMMANDS/IP/verilog/uart_tx_fifo.v
View File

@@ -24,6 +24,7 @@ module uart_tx_fifo #(
typedef enum logic [1:0] {
IDLE,
WAIT_READY,
READ_FIFO,
SEND
} state_t;
@@ -57,13 +58,14 @@ module uart_tx_fifo #(
);
always_ff @(posedge clk) begin
// Valeurs par défaut
fifo_rd_en <= 0;
uart_tx_enable <= 0;
case (state)
IDLE: begin
fifo_rd_en <= 0;
uart_tx_enable <= 0;
if (!fifo_empty) begin
fifo_rd_en <= 1;
state <= WAIT_READY;
end
end
@@ -71,12 +73,17 @@ module uart_tx_fifo #(
WAIT_READY: begin
if (tx_ready) begin
fifo_rd_en <= 1;
state <= SEND;
state <= READ_FIFO;
end
end
SEND: begin
READ_FIFO: begin
uart_tx_data <= fifo_rd_data;
state <= SEND;
fifo_rd_en <= 0;
end
SEND: begin
uart_tx_enable <= 1;
state <= IDLE;
end