From: Martin Prudek <prudemar@fel.cvut.cz>
Date: Sat, 28 Mar 2015 12:12:22 +0000 (+0100)
Subject: zjednoduseni vzorkovani spi hodin gpio hodinami. Otestovano a funkcni. (SCLK 500... 
X-Git-Url: https://rtime.felk.cvut.cz/gitweb/fpga/rpi-motor-control.git/commitdiff_plain/a13a7e25b5b3707dd2fdf05f448dbba5e86b7529

zjednoduseni vzorkovani spi hodin gpio hodinami. Otestovano a funkcni. (SCLK 500 KHz, GPCLK 2MHz)
---

diff --git a/pmsm-control/rpi_mc_simple_dc.vhdl b/pmsm-control/rpi_mc_simple_dc.vhdl
index 7cdfac3..75ed727 100644
--- a/pmsm-control/rpi_mc_simple_dc.vhdl
+++ b/pmsm-control/rpi_mc_simple_dc.vhdl
@@ -121,8 +121,8 @@ architecture behavioral of rpi_mc_simple_dc is
 	--"0000000100100011010001010110011110001001101010111100110111101111";
 		--(others=>'0'); --registr pro SPI
 	signal position: std_logic_vector(31 downto 0); --pozice z qcounteru
-	signal spi_clk_rise: std_logic; --synchronni detekce nabezne hrany spi hodin
-	signal spi_clk_fall: std_logic; --synchronni detekce sestupne hrany spi hodin
+	--signal spi_clk_rise: std_logic; --synchronni detekce nabezne hrany spi hodin
+	--signal spi_clk_fall: std_logic; --synchronni detekce sestupne hrany spi hodin
 	signal ce0_int: std_logic;
 	
 	--  attribute syn_noprune of gpio2 : signal is true;
@@ -211,28 +211,31 @@ begin
 	pwm(3) <= '0';
 
 	
-	process(gpio_clk)
-	begin
-		if gpio_clk= '1' and gpio_clk'event then
-			spiclk_old_lvl<=spi_clk;
-		end if;
-	end process;
-	spi_clk_rise <= (not spiclk_old_lvl) and spi_clk;
-	spi_clk_fall <= (not spi_clk) and spiclk_old_lvl; 
+--	process(gpio_clk)
+--	begin
+--		if gpio_clk= '1' and gpio_clk'event then
+--			spiclk_old_lvl<=spi_clk;
+--		end if;
+--	end process;
+--	spi_clk_rise <= (not spiclk_old_lvl) and spi_clk;
+--	spi_clk_fall <= (not spi_clk) and spiclk_old_lvl; 
  
   
-	process(spi_clk_fall,spi_clk_rise)
+--	process(spi_clk_fall,spi_clk_rise)
+	process
 	begin
-		if (rising_edge(spi_clk_rise)) then --rising edge, faze cteni 
+		wait until (gpio_clk'event and gpio_clk='1');
+		if (spi_clk='1' and spiclk_old_lvl='0') then --rising edge, faze cteni
 			if (gpio7 = '0') then             -- SPI CS must be selected
 				-- shift serial data into dat_reg on each rising edge
 				-- of SCK, MSB first
 				dat_reg(7 downto 0) <= dat_reg(6 downto 0) & gpio10;
+				spiclk_old_lvl <= '1';
 				end if;
-		elsif (rising_edge(spi_clk_fall) ) then --falling edge, faze zapisu
+		elsif (spi_clk='0' and spiclk_old_lvl='1' ) then --falling edge, faze zapisu
 			if (gpio7 = '0') then
 				gpio9 <= dat_reg(7); --zapisujeme nejdriv MSB
-				
+				spiclk_old_lvl <= '0';
 			end if;
 		end if;
 	end process;