uLab
/
remotelaboratory
mirror of https://mirror.git.trinitydesktop.org/gitea/uLab/remotelaboratory
0
0
Fork 0
Code Issues Releases Wiki Activity

Slow demo file 7-segment clock to a more reasonable KHz value

Browse Source
master
Timothy Pearson 6 years ago
parent d64d218d18
commit 9db454faca
1 changed files with 104 additions and 104 deletions
Show Stats Download Patch File Download Diff File

208
fpga/serial/lattice/eb85/ice40_remotefpga_test/main.v
Unescape View File

@ -1,104 +1,104 @@
// This file is part of the Universal Laboratory (uLab) // This file is part of the Universal Laboratory (uLab)
// //
// © 2007 - 2019 Raptor Engineering, LLC // © 2007 - 2019 Raptor Engineering, LLC
// All Rights Reserved // All Rights Reserved
// //
// Licensed under the terms of the AGPL v3 // Licensed under the terms of the AGPL v3
module guest_fpga_top(clk, reset, four_bit_input, four_bit_output, eight_bit_input, eight_bit_output, sixteen_bit_input, sixteen_bit_output, lcd_data_in_address, lcd_data_in_data, lcd_data_in_enable, led_segment_bus, led_digit_select); module guest_fpga_top(clk, reset, four_bit_input, four_bit_output, eight_bit_input, eight_bit_output, sixteen_bit_input, sixteen_bit_output, lcd_data_in_address, lcd_data_in_data, lcd_data_in_enable, led_segment_bus, led_digit_select);
input clk; input clk;
input reset; input reset;
input [3:0] four_bit_input; input [3:0] four_bit_input;
output reg [3:0] four_bit_output; output reg [3:0] four_bit_output;
input [7:0] eight_bit_input; input [7:0] eight_bit_input;
output reg [7:0] eight_bit_output; output reg [7:0] eight_bit_output;
input [15:0] sixteen_bit_input; input [15:0] sixteen_bit_input;
output reg [15:0] sixteen_bit_output; output reg [15:0] sixteen_bit_output;
output reg [5:0] lcd_data_in_address; output reg [5:0] lcd_data_in_address;
output reg [7:0] lcd_data_in_data; output reg [7:0] lcd_data_in_data;
output reg lcd_data_in_enable; output reg lcd_data_in_enable;
output reg [7:0] led_segment_bus; output reg [7:0] led_segment_bus;
output reg [3:0] led_digit_select; output reg [3:0] led_digit_select;
reg [7:0] lcd_sample_counter = 48; // Create a sample LCD display counter register reg [7:0] lcd_sample_counter = 48; // Create a sample LCD display counter register
reg [31:0] lcd_character_change_timer = 0; // Wait a certain number of cycles before loading a new character reg [31:0] lcd_character_change_timer = 0; // Wait a certain number of cycles before loading a new character
reg [5:0] lcd_current_character = 0; // The current character's address reg [5:0] lcd_current_character = 0; // The current character's address
always @(posedge clk) begin always @(posedge clk) begin
four_bit_output = four_bit_input; // Loopback four_bit_output = four_bit_input; // Loopback
eight_bit_output = eight_bit_input[3:0] + eight_bit_input[7:4]; // Sample adder eight_bit_output = eight_bit_input[3:0] + eight_bit_input[7:4]; // Sample adder
sixteen_bit_output = sixteen_bit_input[15:8] * sixteen_bit_input[7:0]; // Sample multiplier sixteen_bit_output = sixteen_bit_input[15:8] * sixteen_bit_input[7:0]; // Sample multiplier
// Sample LCD display routine // Sample LCD display routine
lcd_data_in_address = lcd_current_character; // Character location on the LCD display lcd_data_in_address = lcd_current_character; // Character location on the LCD display
lcd_data_in_data = lcd_sample_counter; // Character code to display lcd_data_in_data = lcd_sample_counter; // Character code to display
lcd_data_in_enable = 1; // Enable data transmission lcd_data_in_enable = 1; // Enable data transmission
// Cycle through all character positions // Cycle through all character positions
lcd_current_character = lcd_current_character + 1; lcd_current_character = lcd_current_character + 1;
if (lcd_current_character > 31) begin if (lcd_current_character > 31) begin
lcd_current_character = 16; lcd_current_character = 16;
end end
// Cycle through the numbers 0 to 9 at one second intervals // Cycle through the numbers 0 to 9 at one second intervals
lcd_character_change_timer = lcd_character_change_timer + 1; lcd_character_change_timer = lcd_character_change_timer + 1;
if (lcd_character_change_timer > 6000000) begin // Wait one second in between character changes if (lcd_character_change_timer > 6000000) begin // Wait one second in between character changes
lcd_character_change_timer = 0; lcd_character_change_timer = 0;
lcd_sample_counter = lcd_sample_counter + 1; lcd_sample_counter = lcd_sample_counter + 1;
if (lcd_sample_counter > 57) begin // Character code for the digit 9 if (lcd_sample_counter > 57) begin // Character code for the digit 9
lcd_sample_counter = 48; // Character code for the digit 0 lcd_sample_counter = 48; // Character code for the digit 0
end end
end end
end end
// 7-segment LED display driver clock generator // 7-segment LED display driver clock generator
reg sseg_clock; reg sseg_clock;
reg [4:0] sseg_clock_counter; reg [10:0] sseg_clock_counter;
always @(posedge clk) begin always @(posedge clk) begin
sseg_clock_counter = sseg_clock_counter + 1; sseg_clock_counter = sseg_clock_counter + 1;
if (sseg_clock_counter > 16) begin if (sseg_clock_counter > 1023) begin
sseg_clock_counter = 0; sseg_clock_counter = 0;
sseg_clock = ~sseg_clock; sseg_clock = ~sseg_clock;
end end
end end
// 7-segment LED display driver // 7-segment LED display driver
// led_segment_bus and led_digit_select are active low // led_segment_bus and led_digit_select are active low
// The bit sequence, MSB to LSB, is dp a b c d e f g // The bit sequence, MSB to LSB, is dp a b c d e f g
// Segment letters are taken from ug130.pdf page 15 // Segment letters are taken from ug130.pdf page 15
// 0: 8'b10000001 // 0: 8'b10000001
// 1: 8'b11001111 // 1: 8'b11001111
// 2: 8'b10010010 // 2: 8'b10010010
// 3: 8'b10000110 // 3: 8'b10000110
reg [2:0] current_anode; reg [2:0] current_anode;
always @(posedge sseg_clock) begin always @(posedge sseg_clock) begin
current_anode = current_anode + 1; current_anode = current_anode + 1;
if (current_anode > 3) begin if (current_anode > 3) begin
current_anode = 0; current_anode = 0;
end end
case (current_anode) case (current_anode)
0: begin 0: begin
led_digit_select = 4'b1110; led_digit_select = 4'b1110;
led_segment_bus = 8'b10000001; led_segment_bus = 8'b10000001;
end end
1: begin 1: begin
led_digit_select = 4'b1101; led_digit_select = 4'b1101;
led_segment_bus = 8'b11001111; led_segment_bus = 8'b11001111;
end end
2: begin 2: begin
led_digit_select = 4'b1011; led_digit_select = 4'b1011;
led_segment_bus = 8'b10010010; led_segment_bus = 8'b10010010;
end end
3: begin 3: begin
led_digit_select = 4'b0111; led_digit_select = 4'b0111;
led_segment_bus = 8'b10000110; led_segment_bus = 8'b10000110;
end end
endcase endcase
end end
endmodule endmodule

Write Preview
Loading…
Cancel
Save