use work.util.all;
entity rpi_mc_simple_dc is
+generic(
+ pwm_width : natural:=11
+ );
port (
gpio2: in std_logic; -- SDA
gpio3: in std_logic; -- SCL
gpio4: in std_logic; -- CLK
gpio14: in std_logic; -- Tx
gpio15: in std_logic; -- Rx
- gpio17: out std_logic; -- RTS
- gpio18: out std_logic; -- PWM0/PCMCLK
- gpio27: out std_logic; -- SD1DAT3
- gpio22: out std_logic; -- SD1CLK
- gpio23: out std_logic; -- SD1CMD
- gpio24: out std_logic; -- SD1DAT0
+ gpio17: in std_logic; -- RTS
+ gpio18: in std_logic; -- PWM0/PCMCLK
+ gpio27: in std_logic; -- SD1DAT3
+ gpio22: in std_logic; -- SD1CLK
+ gpio23: in std_logic; -- SD1CMD
+ gpio24: in std_logic; -- SD1DAT0
gpio10: in std_logic; -- SPI0MOSI
gpio9: out std_logic; -- SPI0MISO
- gpio25: out std_logic; -- SD1DAT1
+ gpio25: in std_logic; -- SD1DAT1
gpio11: in std_logic; -- SPI0SCLK
gpio8: in std_logic; -- SPI0CE0
gpio7: in std_logic; -- SPI0CE1
);
end component;
- type state_type is (f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13,f14,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,r13,r14,reset);
+ component mcpwm is
+ generic (
+ pwm_width: natural
+ );
+ port (
+ clock: in std_logic;
+ sync: in std_logic; --flag that counter "restarts-overflows"
+ data_valid:in std_logic; --indicates data is consistent
+ failsafe: in std_logic; --turn off both transistors
+ en_p, en_n: in std_logic; --enable positive & enable shutdown
+ match: in std_logic_vector (pwm_width-1 downto 0); --posion of counter when we swap output logic
+ count: in std_logic_vector (pwm_width-1 downto 0); --we use an external counter
+ out_p, out_n: out std_logic --pwm outputs: positive & shutdown
+ --TODO add the rest of pwm signals, swap match to pwm_word
+ );
+ end component;
+
+
+ type state_type is (f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13,f14,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,r13,r14,f15,r15,reset,rst_wait);
signal state : state_type;
+
+ type channel_type is (ch0, ch1, ch2);
+
signal adc_data: std_logic_vector(11 downto 0); --ADC income data
signal adc_reset : std_logic;
signal adc_rst_old : std_logic_vector(1 downto 0);
signal adc_channels: std_logic_vector(35 downto 0);
signal spiclk_old: std_logic_vector(1 downto 0); --pro detekci hrany SPI hodin
- signal pwm_in, pwm_dir_in: std_logic;
+ --signal pwm_in, pwm_dir_in: std_logic;
signal gpio_clk: std_logic;
signal dat_reg : STD_LOGIC_VECTOR (95 downto 0); --shift register for spi
signal position: std_logic_vector(31 downto 0); --pozice z qcounteru
signal ce0_old: std_logic_vector(1 downto 0);
+ --pwm signals
+ constant pwm_n: natural := 3; --number of pwm outputs
+ --number of ticks per pwm cycle, 2^11=2048
+ constant pwm_period : std_logic_vector (pwm_width-1 downto 0) := (others=>'1');
+ type pwm_res_type is array(1 to 3) of std_logic_vector (pwm_width-1 downto 0);
+
+ signal pwm_match: pwm_res_type; --point of reversion of pwm output, 0 to 2047
+ signal pwm_count: std_logic_vector (pwm_width-1 downto 0); --counter, 0 to 2047
+ signal pwm_sync: std_logic;
+ signal pwm_en_p: std_logic_vector(1 to 3);
+ signal pwm_en_n: std_logic_vector(1 to 3);
+
+ signal income_data_valid: std_logic;
-- attribute syn_noprune of gpio2 : signal is true;
ab_error => open
);
+ pwm_block: for i in pwm_n downto 1 generate
+ pwm_map: mcpwm
+ generic map (
+ pwm_width => pwm_width
+ )
+ port map (
+ clock => gpio_clk, --50 Mhz clk from gpclk on raspberry
+ sync => pwm_sync, --counter restarts
+ data_valid => income_data_valid,
+ failsafe => '0',
+ --
+ -- pwm config bits & match word
+ --
+ en_n => pwm_en_n(i), --enable positive pwm
+ en_p => pwm_en_p(i), --enable "negative" ->activate shutdown
+ match => pwm_match(i),
+ count => pwm_count,
+ -- outputs
+ out_p => pwm(i), --positive signal
+ out_n => shdn(i) --reverse signal is in shutdown mode
+ );
+ end generate;
+
+
-- pll: pll50to200
-- port map (
can_rx and can_tx and
dip_sw(1) and dip_sw(2) and dip_sw(3) and
irc_a and irc_b and
- -- gpio17 and gpio18 and gpio27 and gpio22 and
+ gpio17 and gpio18 and gpio27 and gpio22 and gpio23 and gpio24 and gpio25 and
gpio8 and gpio11 and gpio7 and gpio10 and
ext_scs1 and ext_scs2 and ext_miso and ext_mosi and ext_sclk and ext_scs0;
rs485_dir <= '0';
- shdn(1) <= '0';
- shdn(2) <= '0';
- shdn(3) <= '1';
-
- pwm(1) <= '0';
- pwm(2) <= '0';
- pwm(3) <= '0';
+ --shdn(1) <= '0';
+ --shdn(2) <= '0';
+ --shdn(3) <= '1';
+ --pwm(1) <= '0';
+ --pwm(2) <= '0';
+ --pwm(3) <= '0';
+
+ process
+ begin
+ wait until (gpio_clk'event and gpio_clk='1');
+ IF(pwm_count = pwm_period) THEN
+ --end of period reached
+ pwm_count <= (others=>'0'); --reset counter
+ pwm_sync <= '1'; -- inform PWM logic about new period start
+ ELSE --end of period not reached
+ pwm_count <= std_logic_vector(unsigned(pwm_count)+1); --increment counter
+ pwm_sync <= '0';
+ END IF;
+ end process;
process
begin
--sestupna hrana SS, pripravime data pro prenos
if (ce0_old = "10" ) then
+ income_data_valid<='0';
dat_reg(95 downto 64) <= position(31 downto 0); --pozice
dat_reg(63 downto 61) <= hal_in(1 to 3); --halovy sondy
dat_reg(60 downto 36) <= (others => '1'); --let the rest fill with ones
dat_reg(35 downto 0) <= adc_channels(35 downto 0); --current mesurments
+ adc_reset<='0'; --remove reset flag, and wait on its rising edge
elsif (ce0_old = "01") then --rising edge of SS, we should read the data
adc_reset<=dat_reg(95);
+ pwm_en_p(1 to 3)<=dat_reg(94 downto 92);
+ pwm_en_n(1 to 3)<=dat_reg(91 downto 89);
+ --11 bit pwm TODO: make it generic
+ pwm_match(1)(pwm_width-1 downto 0)<=dat_reg(34 downto 24);
+ pwm_match(2)(pwm_width-1 downto 0)<=dat_reg(22 downto 12);
+ pwm_match(3)(pwm_width-1 downto 0)<=dat_reg(10 downto 0);
+ income_data_valid<='1';
end if;
end process;
process
variable data_ready : std_logic;
- variable channel: std_logic_vector(1 downto 0);
+ variable channel: channel_type;
+ variable reset_re: std_logic:='0';
+ variable reset_count: integer:=0;
begin
wait until (gpio_clk'event and gpio_clk='1');
+
+ --reset rising edge detection
+ adc_rst_old(0)<=adc_reset;
+ adc_rst_old(1)<=adc_rst_old(0);
+
+ if (adc_rst_old="01") then
+ reset_re:='1';
+ end if;
+
case state is
when reset=>
- adc_scs<='0'; --active-high SS
- data_ready:='0';
+ reset_re:='0'; --clear reset flag
+ adc_scs<='1'; --active-low SS
+ adc_sclk<='0'; --lower clock
+ data_ready:='0';
--addresse are CH(A2,A1,A0): CH0:(0,0,1),CH1:(1,0,1),CH2:(0,1,0)
adc_address<="001101010";
- channel:="00";
- when f1=>
+ channel:=ch0;
+ adc_channels(35 downto 0)<=(others=>'1'); --for debug only - remove this line!
+ adc_data(11 downto 0)<=(others=>'1');
+ reset_count:=0;
+ state<=rst_wait;
+ when rst_wait=>
+ if (reset_count<10) then
+ reset_count:=reset_count+1;
+ if (reset_count=7) then
+ adc_scs<='0'; --give the adc some time to prepare before trensfer
+ end if;
+ else
+ state<=f1;
+ end if;
+ when f1=> --1st 'fallin edge' - its not falling edge in any case-if rst clock is low before
adc_sclk<='0'; --clk
adc_mosi<='1'; --start bit
state<=r1; --next state
- when r1=> --rising edge
- adc_sclk<='1';
+ when r1=> --1st rising edge (adc gets the start bit, we get date..)
+ adc_sclk<='1';
adc_data(5)<=adc_miso;
state<=f2;
when f2=> --2nd falling edge
adc_sclk<='0';
adc_mosi<=adc_address(8); --A2 address
state<=r2;
- when r2=> --rising edge
+ when r2=> --2nd rising edge (adc gets A2 address)
adc_sclk<='1';
adc_data(4)<=adc_miso;
state<=f3;
- when f3=> --3rd falling edge
+ when f3=> --3rd falling edge
adc_sclk<='0';
adc_mosi<=adc_address(7); --A1 address
state<=r3;
adc_sclk<='0';
adc_mosi<=adc_address(6); --A0 address
--shift the addresses
- adc_address(8 downto 0)<=adc_address(5 downto 0) & adc_address(8 downto 6);
+ adc_address(8 downto 0)<=adc_address(5 downto 0) & adc_address(8 downto 6);
state<=r4;
when r4=> --rising edge
adc_sclk<='1';
adc_sclk<='0';
adc_mosi<='1'; --SGL/DIF (HIGH - SGL=Single Ended)
state<=r6;
- when r6=> --rising edge
+ when r6=> --6th rising edge (we read last bit of conversion, adc gets SGL/DIF)
adc_sclk<='1';
adc_data(0)<=adc_miso;
state<=f7;
adc_sclk<='0';
adc_mosi<='0'; --PD1 (power down - PD1=PD0=0 -> power down between conversion)
state<=r7;
- when r7=> --rising edge, data ready
+ when r7=> --7th rising edge, data ready
adc_sclk<='1';
if (data_ready='1') then
case channel is
- when "00"=>
+ when ch0=>
adc_channels(35 downto 24)<=adc_data(11 downto 0);
- channel:="01";
- when "01"=>
+ --adc_channels(35 downto 24)<=(others=>'0');
+ channel:=ch1;
+ when ch1=>
adc_channels(23 downto 12)<=adc_data(11 downto 0);
- channel:="10";
- when "10"=>
+ --adc_channels(23 downto 12)<=(others=>'1');
+ channel:=ch2;
+ when ch2=>
adc_channels(11 downto 0)<=adc_data(11 downto 0);
- channel:="00";
+ --adc_channels(11 downto 0)<=(others=>'0');
+ channel:=ch0;
end case;
end if;
data_ready:='1';
adc_sclk<='0';
adc_mosi<='0'; --PD0
state<=r8;
- when r8=> --rising edge
+ when r8=> --8th rising edge (adc gets PD0)
adc_sclk<='1';
state<=f9;
- when f9=> --busy state between conversion, 9th falling edge
+ when f9=> --9th falling edge busy state between conversion (we write nothing)
adc_sclk<='0';
state<=r9;
- when r9=> --10th rising edge
+ when r9=> --9th rising edge (we nor ads get nothing)
adc_sclk<='1';
- adc_data(11)<=adc_miso;
state<=f10;
- when f10=>
+ when f10=> --10th falling edge
adc_sclk<='0';
state<=r10;
- when r10=> --11th rising edge
+ when r10=> --10th rising edge (we read 1. bit of conversion)
adc_sclk<='1';
- adc_data(10)<=adc_miso;
+ adc_data(11)<=adc_miso;
state<=f11;
when f11=>
adc_sclk<='0';
state<=r11;
- when r11=> --12th rising edge
+ when r11=> --11th rising edge
adc_sclk<='1';
- adc_data(9)<=adc_miso;
+ adc_data(10)<=adc_miso;
state<=f12;
when f12=>
adc_sclk<='0';
state<=r12;
- when r12=> --13th rising edge
+ when r12=> --12th rising edge
adc_sclk<='1';
- adc_data(8)<=adc_miso;
+ adc_data(9)<=adc_miso;
state<=f13;
when f13=>
adc_sclk<='0';
state<=r13;
- when r13=> --14th rising edge
+ when r13=> --13th rising edge
adc_sclk<='1';
- adc_data(7)<=adc_miso;
+ adc_data(8)<=adc_miso;
state<=f14;
when f14=>
adc_sclk<='0';
state<=r14;
- when r14=> --15th rising edge
+ when r14=> --14th rising edge
+ adc_sclk<='1';
+ adc_data(7)<=adc_miso;
+ state<=f15;
+ when f15=>
+ adc_sclk<='0';
+ --for rising edge detection in next cycle
+ state<=r15;
+ when r15=> --15th rising edge
adc_sclk<='1';
adc_data(6)<=adc_miso;
- adc_rst_old(0)<=adc_reset;
- adc_rst_old(1)<=adc_rst_old(0);
- if (adc_rst_old="01") then --we check rising edge of reset
+ if (reset_re='1') then --we check rising edge of reset
state<=reset;
else
state<=f1;
projects / fpga / rpi-motor-control.git / blobdiff