пропозиції роботи
Maciej
G.
Projektant /
Programista, Famor
S.A.
Temat: Komunikacja SPI -> Arduino - Elbert v2(Spartan III)
Cześć,kończąc kurs CPLD/FPGA ze strony:
https://startingelectronics.org/software/VHDL-CPLD-cour...
wypróbowałem komunikację SPI (FPGA is SPI slave) pomiędzy Ardiuon Uno a moją płytka FPGA "Elbert v2)
https://numato.com/elbert-v2-spartan-3a-fpga-developmen...
Oto pliki projektu ISE Webpack 14.7
Moduł klienta SPI (3 sygnały : MOSI - data, Slave enable, SPI clock):
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity SPI_rx2_top is
Port ( SCK : in STD_LOGIC; -- SPI input clock
DATA : in STD_LOGIC; -- SPI serial data input
CS : in STD_LOGIC; -- chip select input (active low)
LED : inout STD_LOGIC_VECTOR (7 downto 0));
end SPI_rx2_top;
architecture Behavioral of SPI_rx2_top is
signal dat_reg : STD_LOGIC_VECTOR (7 downto 0);
begin
process (SCK)
begin
if (SCK'event and SCK = '1') then -- rising edge of SCK
if (CS = '0') then -- SPI CS must be selected
-- shift serial data into dat_reg on each rising edge
-- of SCK, MSB first
dat_reg <= dat_reg(6 downto 0) & DATA;
end if;
end if;
end process;
-- only update LEDs when not shifting (CS inactive)
LED <= dat_reg when (CS = '1') else LED;
end Behavioral;
A tu plik "user constraints" dla mojej płytki:
NET "SCK" LOC = "P19";
NET "DATA" LOC = "P21";
NET "CS" LOC = "P18";
// PINY ZGODNIE Z INSTRUKCJA DO PLYTKI (ODREBNY PIN DO KAZDEGO Z WYJSC)
NET "LED<0>" LOC = "P46"; //LED0
NET "LED<1>" LOC = "P47"; //LED1
NET "LED<2>" LOC = "P48"; //LED2
NET "LED<3>" LOC = "P49"; //LED3
NET "LED<4>" LOC = "P50"; //LED4
NET "LED<5>" LOC = "P51"; //LED5
NET "LED<6>" LOC = "P54"; //LED6
NET "LED<7>" LOC = "P55"; //LED7
A tu przykładowy kod dla Arduino :
Ten post został edytowany przez Autora dnia 11.08.17 o godzinie 17:13
*
Digital Pot Control
This example controls an Analog Devices AD5206 digital potentiometer.
The AD5206 has 6 potentiometer channels. Each channel's pins are labeled
A - connect this to voltage
W - this is the pot's wiper, which changes when you set it
B - connect this to ground.
The AD5206 is SPI-compatible,and to command it, you send two bytes,
one with the channel number (0 - 5) and one with the resistance value for the
channel (0 - 255).
The circuit:
* All A pins of AD5206 connected to +5V
* All B pins of AD5206 connected to ground
* An LED and a 220-ohm resisor in series connected from each W pin to ground
* CS - to digital pin 10 (SS pin)
* SDI - to digital pin 11 (MOSI pin)
* CLK - to digital pin 13 (SCK pin)
created 10 Aug 2010
by Tom Igoe
Thanks to Heather Dewey-Hagborg for the original tutorial, 2005
*/
// inslude the SPI library:
#include <SPI.h>
// set pin 10 as the slave select for the digital pot:
const int slaveSelectPin = 10;
void setup() {
// set the slaveSelectPin as an output:
pinMode(slaveSelectPin, OUTPUT);
// initialize SPI:
SPI.begin();
}
void loop() {
// go through the six channels of the digital pot:
for (int channel = 0; channel < 6; channel++) {
// change the resistance on this channel from min to max:
for (int level = 0; level < 255; level++) {
digitalPotWrite(channel, level);
delay(10);
}
// wait a second at the top:
delay(100);
// change the resistance on this channel from max to min:
for (int level = 0; level < 255; level++) {
digitalPotWrite(channel, 255 - level);
delay(10);
}
}
}
void digitalPotWrite(int address, int value) {
// take the SS pin low to select the chip:
digitalWrite(slaveSelectPin, LOW);
// send in the address and value via SPI:
SPI.transfer(address);
SPI.transfer(value);
// take the SS pin high to de-select the chip:
digitalWrite(slaveSelectPin, HIGH);
}
Użyte 3 piny 13, 1, 10 - opis w programie. Komunikacja działa bez zarzutu.
Pozdrawiam
