NIOS Character. Last updated 7/16/18
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1 NIOS Character Last updated 7/16/18
2 Character Buffer Block Diagram CLK RST Clock Reset_bar CLK RST PLL 25MHz* CPU Onchip Memory JTAG UART Timer System ID S M S S S S S M S Character Buffer DMA Dual Port FIFO Character System VGA Controller VGA Connector 25MHz** - VGA clk 2 tj
3 Character Buffer Block 80 char x 60 lines ASCII Character 8 x 8 matrix / char Automatically scans through memory 3 tj
4 Dual Clock FIFO Allows different incoming and outgoing data rates 4 tj
5 VGA Controller Block Creates and drives the required VGA signals 5 tj
6 Create a new Quartus project Do not select a Simulation Tool in EDA Tool Settings Open Tools Platform Designer 6 tj
7 Add NIOS Processors and Peripherals Embedded Processors NIOS II Processor NIOS II/f Add On-chip Memory Basic Functions On Chip Memory On Chip Memory (RAM or ROM) RAM Size = 12,000 bytes 7 tj
8 Add JTAG Interface Protocols Serial JTAG Uart Intel FPGA IP Add Timer Processors and Peripherals Peripherals Interval Timer Intel FPGA IP Add System ID Basic Functions Simulation; Debug and Verification Debug and Performance System ID Peripheral Intel FPGA IP 8 tj
9 Connect up basic NIOS system NIOS Inputs 9 tj
10 Connect up basic NIOS system On-chip Memory Connect to data and instruction masters 10 tj
11 Connect up basic NIOS system JTAG, Timer, SysID Connect to data master Assign Priorities 11 tj
12 Connect up basic NIOS system Assign the NIOS II Reset and Exception vectors 12 tj
13 Create Character System Add a PLL Basic Functions Clocks; PLLs and Resets PLL ALTPLL Intel FPGA IP 50MHz input clock no areset or locked c0 25MHz 13 tj
14 Create Character System Connect PLL Connect to data master 14 tj
15 Create Character System Character Buffer University Program Audio and Video Video Character Buffer for VGA Display Connect to data master 15 tj
16 Create Character System Dual Clock FIFO University Program Audio and Video Video Dual Clock FIFO Color Bits 10 Color Planes - 3 Connect to video character buffer streaming source Connect to c0 16 tj
17 Create Character System VGA Controller University Program Audio and Video Video VGA Controller DE10-Lite VGA Connector VGA 640x480 Connect to dual_clock_buffer streaming source Connect to c0 Export and rename 17 tj
18 Create Character System Assign Base Addresses 18 tj
19 Create Character System Check for errors 19 tj
20 Create Character System Save the Platform Designer system Generate the Platform Designer system The first time you generate you must delete the last directory in the path don t use the 20 tj
21 Create Character System Add the.qip file to the project 21 tj
22 Create DE10 Design Instantiate into a VHDL file Open a new VHDL design In Platform Designer: Generate Show Instantiation Template Copy and Paste into the new design where appropriate component nios_character is port ( clk_clk : in std_logic := 'X'; -- clk reset_reset_n : in std_logic := 'X'; -- reset_n vga_out_clk : out std_logic; -- CLK vga_out_hs : out std_logic; -- HS vga_out_vs : out std_logic; -- VS vga_out_blank : out std_logic; -- BLANK vga_out_sync : out std_logic; -- SYNC vga_out_r : out std_logic_vector(3 downto 0); -- R vga_out_g : out std_logic_vector(3 downto 0); -- G vga_out_b : out std_logic_vector(3 downto 0) -- B ); end component nios_character; u0 : component nios_character port map ( clk_clk => CONNECTED_TO_clk_clk, -- clk.clk reset_reset_n => CONNECTED_TO_reset_reset_n, -- reset.reset_n vga_out_clk => CONNECTED_TO_vga_out_CLK, -- vga_out.clk vga_out_hs => CONNECTED_TO_vga_out_HS, --.HS vga_out_vs => CONNECTED_TO_vga_out_VS, --.VS vga_out_blank => CONNECTED_TO_vga_out_BLANK, --.BLANK vga_out_sync => CONNECTED_TO_vga_out_SYNC, --.SYNC vga_out_r => CONNECTED_TO_vga_out_R, --.R vga_out_g => CONNECTED_TO_vga_out_G, --.G vga_out_b => CONNECTED_TO_vga_out_B --.B ); 22 tj
23 Create DE10 Design Instantiate into a VHDL file Instantiation template component library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; entity nios_character_de10 is port( CLOCK_50 : in std_logic; VGA_HS: out std_logic; VGA_VS: out std_logic; ); end entity; VGA_R: out std_logic_vector(3 downto 0); VGA_G: out std_logic_vector(3 downto 0); VGA_B: out std_logic_vector(3 downto 0) architecture behavioral of nios_character_de10 is no signals component nios_character is port ( clk_clk : in std_logic := 'X ; -- clk reset_reset_n : in std_logic := 'X ; -- reset_n vga_out_clk : out std_logic; -- CLK vga_out_hs : out std_logic; -- HS vga_out_vs : out std_logic; -- VS vga_out_blank : out std_logic; -- BLANK vga_out_sync : out std_logic; -- SYNC vga_out_r : out std_logic_vector(3 downto 0); -- R vga_out_g : out std_logic_vector(3 downto 0); -- G vga_out_b : out std_logic_vector(3 downto 0) -- B ); end component nios_character; DE10 pin aliases from.qsf file 23 tj
24 Create DE10 Design Instantiate into a VHDL file Instantiation template instance mapped to DE10 qsf pin aliases begin u0 : component nios_character port map ( clk_clk => CLOCK_50, -- clk.clk reset_reset_n => '1, -- reset.reset_n --vga_out_clk => CONNECTED_TO_vga_out_CLK, -- vga_out.clk vga_out_hs => VGA_HS, --.HS vga_out_vs => VGA_VS, --.VS --vga_out_blank => CONNECTED_TO_vga_out_BLANK, --.BLANK --vga_out_sync => CONNECTED_TO_vga_out_SYNC, --.SYNC vga_out_r => VGA_R, --.R vga_out_g => VGA_G, --.G vga_out_b => VGA_B --.B ); end architecture; Note: these 3 signals are not used - comment out or remove 24 tj
25 Create DE10 Design Prepare to synthesize If you did not do these when you created the project be sure to do them now assignments device device and Pin options Single Uncompressed with memory initialization Import the pin aliases (qsf file) Setup the SDF file Be sure to set your top level entity Start Compilation 25 tj
26 Create DE10 Design Complete the HW setup Download the HW project onto the board DO NOT CLOSE either of these windows 26 tj
27 Create Eclipse System Open NIOSII software Tools NIOSII Software Build Tools for Eclipse Create the BSP File New NIOSII Application and BSP from template Blank Template Edit the BSP Right click on the BSP, NIOS II BSP Editor Change the properties for small systems Small C library Reduced device drivers Re-Generate the BSP 27 tj
28 Create Eclipse System In the BSP under drivers/inc Open altera_up_avalon_video_character_buffer_with_dma.h Find the video character buffer structure name Create a pointer of this type // define a pointer of type char buffer type // to use as a reference in the dma functions // alt_up_char_buffer_dev * char_buf_dev; 28 tj
29 Create Eclipse System In the BSP under drivers/inc Open altera_up_avalon_video_character_buffer_with_dma.h Find the function to open the character buffer dma device 29 tj
30 Create Eclipse System In the BSP under drivers/inc Open the device and assign it to the previously defined pointer // open the Character Buffer control port // name reference is in system.h // "/dev/video_character_buffer_with_dma_0_avalon_char_buffer_slave" // char_buf_dev = alt_up_char_buffer_open_dev("/dev/video_character_buffer_with_dma_0"); 30 tj
31 Create Eclipse System In the BSP under drivers/inc Open altera_up_avalon_video_character_buffer_with_dma.h The remainder of the character buffer dma commands are in this file This actually writes to the buffer /** Draw a character at the location specified by <em>(x, y)</em> on the * VGA monitor with white color and transparent background * ch -- the character to draw x-- the \em x coordinate y-- the \em y coordinate * 0 for success, -1 for error (such as out of bounds) **/ int alt_up_char_buffer_draw(alt_up_char_buffer_dev *char_buffer, unsigned char ch, unsigned int x, unsigned int y); tj
32 Create Eclipse System /** Draw a NULL-terminated text string at the location specified by <em>(x, y)</em> * ch -- the character to draw x-- the \em x coordinate y-- the \em y coordinate Strings do not wrap around the display * 0 for success, -1 for error (such as out of bounds) **/ int alt_up_char_buffer_string(alt_up_char_buffer_dev *char_buffer, const char *ptr, unsigned int x, unsigned int y); /** Clears the character buffer's memory * 0 for success **/ int alt_up_char_buffer_clear(alt_up_char_buffer_dev *char_buffer); This actually writes to the buffer 32 tj
33 Create Eclipse System Write a program to print some characters to the screen ///////////////// // Include files ///////////////// #include "altera_up_avalon_video_character_buffer_with_dma.h" #include "system.h" #include <stdio.h> 33 tj
34 Create Eclipse System Write a program to print some characters to the screen int main(void){ // define a pointer of type char buffer type // to use as a reference in the dma functions // alt_up_char_buffer_dev * char_buf_dev; // open the Character Buffer port // name reference is in system.h // "/dev/video_character_buffer_with_dma_0_avalon_char_buffer_slave" // char_buf_dev = alt_up_char_buffer_open_dev("/dev/video_character_buffer_with_dma_0"); // Check for error and output to the console // if ( char_buf_dev == NULL) printf ("Error: could not open character buffer device \n"); else printf ("Opened character buffer device \n"); 34 tj
35 Create Eclipse System Write a program to print some characters to the screen // Print some text to the screen // char text = 'X'; char text_top_row[40] = "Altera DE10_lite\0"; char text_bottom_row[40] = "Character Buffer\0"; /* output text message near the middle of the VGA monitor */ alt_up_char_buffer_clear(char_buf_dev); alt_up_char_buffer_draw(char_buf_dev, text, 0, 0); alt_up_char_buffer_draw(char_buf_dev, text, 0, 59); alt_up_char_buffer_draw(char_buf_dev, text, 79, 0); alt_up_char_buffer_draw(char_buf_dev, text, 79, 59); alt_up_char_buffer_string(char_buf_dev, text_top_row, 20,20); alt_up_char_buffer_string(char_buf_dev, text_bottom_row, 40,40); // end program message printf ("Program complete \n"); } return 0; 35 tj
36 Create Eclipse System Compile the software Select the code file (char.c) Project Build Project Right Click on the project run as Nios II Hardware 36 tj
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