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-- Copyright (c) 2019 Nuand LLC
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.math_real.all;
use ieee.math_complex.all;
library work;
use work.util.all;
architecture wlan_micro_packet_dma of fx3_model is
constant PCLK_HALF_PERIOD : time := 1 sec * (1.0/100.0e6/2.0);
constant START_COUNT : natural := 32;
constant BLOCKS_PER_ITERATION : natural := 4;
constant ITERATIONS : natural := 4;
-- Control mapping
alias dma0_rx_ack is fx3_ctl( 0);
alias dma1_rx_ack is fx3_ctl( 1);
alias dma2_tx_ack is fx3_ctl( 2);
alias dma3_tx_ack is fx3_ctl( 3);
alias dma_rx_enable is fx3_ctl( 4);
alias dma_tx_enable is fx3_ctl( 5);
alias dma_idle is fx3_ctl( 6);
alias system_reset is fx3_ctl( 7);
alias dma0_rx_reqx is fx3_ctl( 8);
alias dma1_rx_reqx is fx3_ctl(12); -- due to 9 being connected to dclk
alias dma2_tx_reqx is fx3_ctl(10);
alias dma3_tx_reqx is fx3_ctl(11);
type gpif_state_t is (IDLE, TX_META, TX_SAMPLES, RX_SAMPLES);
signal gpif_state_rx, gpif_state_tx : gpif_state_t;
signal rx_done : boolean := false;
signal tx_done : boolean := false;
signal rx_data : std_logic_vector(31 downto 0);
signal tx_data : std_logic_vector(31 downto 0);
function data_gen (count : natural) return std_logic_vector is
variable msw, lsw : std_logic_vector(15 downto 0);
begin
msw := (others =>'0');--std_logic_vector(to_signed(count+1, 16));
lsw := std_logic_vector(to_signed(count, 16));
return (msw & lsw);
end function data_gen;
function data_check (count : natural ; rxdata : std_logic_vector(31 downto 0)) return boolean is
begin
return (rxdata = data_gen(count));
end function data_check;
type integer_array_t is array(natural range <>) of std_logic_vector(31 downto 0);
constant TX_PACKET_54_ONE : integer_array_t := (
x"00000000", x"00020000", x"009a000a", x"00000000", x"000000D4",
x"e110b470", x"000012e5");
constant TX_PACKET_54_TWO : integer_array_t := (
x"00000240", x"00020001", x"009a0036", x"00000000", x"02000207",
x"04000300", x"06000500", x"08000700", x"0a000900", x"0c000b00",
x"0e000d00", x"0f010f00", x"02010101", x"04010301", x"06010501",
x"08010701", x"0a010901", x"0c010b01");
constant TX_PACKET_54_THREE : integer_array_t := (
x"00000340", x"00020002", x"009a0036", x"00000000", x"02000207",
x"04000300", x"06000500", x"08000700", x"0a000900", x"0c000b00",
x"0e000d00", x"0f010f00", x"02010101", x"04010301", x"06010501",
x"08010701" , x"0a010901" , x"0c010b01");
constant TX_PACKET_54_FOUR : integer_array_t := (
x"00000340", x"00020001", x"009a0036", x"00000000", x"02000207",
x"04000300", x"06000500", x"08000700", x"0a000900", x"0c000b00",
x"0e000d00", x"0f010f00", x"02010101", x"04010301", x"06010501",
x"08010701", x"0a010901", x"0c010b01");
begin
-- DCLK which isn't used
fx3_ctl(9) <= '0';
fx3_ctl(3 downto 0) <= (others => 'Z');
-- Create a 100MHz clock output
fx3_pclk <= not fx3_pclk after PCLK_HALF_PERIOD when (not rx_done or not tx_done) else '0';
-- Doneness
done <= rx_done and tx_done;
rx_sample_stream : process
constant BLOCK_SIZE : natural := 512;
variable count : natural := START_COUNT;
variable req_time : time;
begin
gpif_state_rx <= IDLE;
dma0_rx_reqx <= '1';
dma1_rx_reqx <= '1';
dma_rx_enable <= '0';
rx_data <= (others => 'U');
wait until rising_edge(fx3_pclk) and system_reset = '0';
nop(fx3_pclk, 1000);
wait until rising_edge(fx3_pclk) and fx3_rx_en = '1';
wait for 30 us;
for j in 1 to ITERATIONS loop
dma_rx_enable <= '1';
for i in 1 to BLOCKS_PER_ITERATION loop
dma0_rx_reqx <= '0';
req_time := now;
wait until rising_edge( fx3_pclk ) and dma0_rx_ack = '1';
wait until rising_edge( fx3_pclk );
dma0_rx_reqx <= '1';
report "RX iteration " & to_string(j) & " block " & to_string(i) & " delay " & to_string(now - req_time);
for i in 1 to BLOCK_SIZE loop
gpif_state_rx <= RX_SAMPLES;
rx_data <= fx3_gpif;
wait until rising_edge( fx3_pclk );
--assert data_check(count, rx_data) severity failure;
count := (count + 1) mod 2048;
gpif_state_rx <= IDLE;
rx_data <= (others => 'X');
end loop;
end loop;
dma_rx_enable <= '0';
wait for 10 us;
end loop;
report "Done with RX sample stream";
rx_done <= true;
wait;
end process;
tx_sample_stream : process
constant BLOCK_SIZE : natural := 512;
variable count : natural := START_COUNT;
variable timestamp_cntr : natural := 100;
variable header_len : natural := 0;
variable packet_len : natural := 0;
variable data_out : std_logic_vector(31 downto 0);
variable req_time : time;
begin
gpif_state_tx <= IDLE;
dma2_tx_reqx <= '1';
dma3_tx_reqx <= '1';
dma_tx_enable <= '0';
fx3_gpif <= (others =>'Z');
wait until rising_edge(fx3_pclk) and system_reset = '0';
nop(fx3_pclk, 1000);
wait until rising_edge(fx3_pclk) and fx3_tx_en = '1';
wait for 10 us;
for k in 1 to ITERATIONS loop
dma_tx_enable <= '1';
for j in 1 to BLOCKS_PER_ITERATION loop
header_len := 0;
dma3_tx_reqx <= '0';
req_time := now;
wait until rising_edge( fx3_pclk ) and dma3_tx_ack = '1';
wait until rising_edge( fx3_pclk );
wait until rising_edge( fx3_pclk );
wait until rising_edge( fx3_pclk );
dma3_tx_reqx <= '1';
report "TX iteration " & to_string(k) & " block " & to_string(j) & " delay " & to_string(now - req_time);
if( fx3_tx_meta_en = '1') then
header_len := 4;
for i in 1 to 4 loop
case (i) is
when 1 =>
if( j = 1) then
packet_len := TX_PACKET_54_ONE'length;
elsif( j = 2 ) then
packet_len := TX_PACKET_54_TWO'length;
elsif( j = 3 ) then
packet_len := TX_PACKET_54_THREE'length;
else
packet_len := TX_PACKET_54_FOUR'length;
end if;
data_out := x"1000" & std_logic_vector(to_unsigned(packet_len, 16));
when 2 =>
--data_out(31 downto 0) := std_logic_vector(to_signed(timestamp_cntr, 32));
--timestamp_cntr := timestamp_cntr + 300;
data_out := (others => '0');
when 3 =>
data_out := (others => '0');
when 4 =>
data_out := (others => '1');
end case;
gpif_state_tx <= TX_META;
fx3_gpif <= data_out;
tx_data <= data_out;
wait until rising_edge( fx3_pclk );
gpif_state_tx <= IDLE;
tx_data <= (others => 'X');
end loop;
end if;
count := 0;
for i in 0 to packet_len-1 loop
gpif_state_tx <= TX_SAMPLES;
if( j = 1 ) then
data_out := std_logic_vector(TX_PACKET_54_ONE(i));
elsif( j = 2 ) then
data_out := std_logic_vector(TX_PACKET_54_TWO(i));
elsif( j = 3 ) then
data_out := std_logic_vector(TX_PACKET_54_THREE(i));
else
data_out := std_logic_vector(TX_PACKET_54_FOUR(i));
end if;
fx3_gpif <= data_out(31 downto 0);
tx_data <= data_out(31 downto 0);
wait until rising_edge( fx3_pclk );
count := (count + 1) mod 2048;
gpif_state_tx <= IDLE;
tx_data <= (others => 'X');
end loop;
fx3_gpif <= (others =>'Z');
nop(fx3_pclk, 10);
end loop;
wait for 8 ms;
dma_tx_enable <= '0';
wait for 10 us;
end loop;
report "Done with TX sample stream";
tx_done <= true;
wait;
end process;
reset_system : process
begin
system_reset <= '1';
dma_idle <= '0';
nop( fx3_pclk, 100 );
system_reset <= '0';
nop( fx3_pclk, 10 );
dma_idle <= '1';
wait;
end process;
-- TODO: UART Interface
fx3_uart_txd <= '1';
fx3_uart_cts <= '1';
assert (gpif_state_tx = IDLE and gpif_state_rx /= IDLE)
or (gpif_state_rx = IDLE and gpif_state_tx /= IDLE)
or (gpif_state_rx = IDLE and gpif_state_tx = IDLE)
report "gpif_state_rx and gpif_state_tx cannot both be non-idle"
severity failure;
end architecture wlan_micro_packet_dma;
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