Добавили аппаратный контроль таймаута в шине для готовности периферийный плат. Добавили в регистр контроля шины состояние передачи (бит 1). Уменьшили период такта по сихросигналу на четверть.
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@ -43,7 +43,7 @@ signal addressToTransmit : std_logic_vector(7 downto 0) := x"00";
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signal dataToTransmit : std_logic_vector(15 downto 0) := x"0000";
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signal dataFromDevices : std_logic_vector(15 downto 0) := x"0000";
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type CommunicationState_start is (Waiting, TransmitAddress, TransmitData, TransmitCRC, TransmitCheck, ReceiveData, ReceiveCRC, ReceiveCheck);
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type CommunicationState_start is (Waiting, TransmitAddress, TransmitData, TransmitCRC, TransmitCheck, ReceiveData, ReceiveCRC, ReceiveCheck, Timeout);
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signal CommunicationState : CommunicationState_start := Waiting ;
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signal resetCRC : std_logic := '1';
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@ -110,7 +110,8 @@ begin
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process(clk) is
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variable count : integer range 0 to 255 := 0;
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variable countValue : integer range 0 to 255 := 50;
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variable halfPeriod : integer range 0 to 255 := 50;
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variable pause : integer range 0 to 255 := 200;
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variable state : integer range 0 to 1 := 1;
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variable bitCnt : integer range -1 to 31 := 0;
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variable latch : integer range 0 to 1 := 0;
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@ -123,8 +124,6 @@ begin
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latch := 0;
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resetCRC <= '1';
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sbdataout <= '0';
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lineBusy <= '0';
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count := 0;
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state := 1;
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if start = '1' and startPrev = '0' then
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direction <= cmdBuf(15);
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@ -133,9 +132,30 @@ begin
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dataCRC(23 downto 16) <= cmdBuf(7 downto 0);
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dataToTransmit <= dataBufIn;
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dataCRC(15 downto 0) <= dataBufIn;
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controlBuf(15 downto 2) <= (others => '0');
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controlBuf(1) <= '1';
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controlBuf(0) <= '0';
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if count < pause then
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CommunicationState <= Timeout;
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count := count + 1;
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else
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CommunicationState <= TransmitAddress;
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lineBusy <= '1';
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controlBuf <= (others => '0');
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count:= 0;
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end if;
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else
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if count < pause then
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count := count + 1;
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controlBuf(1) <= '1';
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else
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controlBuf(1) <= '0';
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end if;
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end if;
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when Timeout =>
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if count < pause then
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count := count + 1;
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else
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CommunicationState <= TransmitAddress;
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count:= 0;
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end if;
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when TransmitAddress =>
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if bitCnt = -1 then
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@ -147,7 +167,7 @@ begin
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end if;
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bitCnt := 15;
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else
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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if latch = 0 then
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sbdataout <= direction;
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@ -157,16 +177,16 @@ begin
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sbclk <= '0';
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end if;
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count := count + 1;
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elsif count = countValue and state = 1 then
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elsif count = halfPeriod and state = 1 then
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latch := 1;
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count := 0;
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state := 0;
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elsif count < countValue and state = 0 then
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elsif count < halfPeriod and state = 0 then
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if count = 0 then
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sbclk <= '1';
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end if;
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count := count + 1;
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elsif count = countValue and state = 0 then
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elsif count = halfPeriod and state = 0 then
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count := 0;
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state := 1;
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bitCnt := bitCnt - 1;
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@ -177,21 +197,21 @@ begin
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CommunicationState <= TransmitCRC;
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bitCnt := 3;
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else
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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sbdataout <= dataToTransmit(bitCnt);
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sbclk <= '0';
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end if;
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count := count + 1;
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elsif count = countValue and state = 1 then
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elsif count = halfPeriod and state = 1 then
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count := 0;
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state := 0;
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elsif count < countValue and state = 0 then
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elsif count < halfPeriod and state = 0 then
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if count = 0 then
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sbclk <= '1';
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end if;
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count := count + 1;
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elsif count = countValue and state = 0 then
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elsif count = halfPeriod and state = 0 then
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count := 0;
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state := 1;
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bitCnt := bitCnt - 1;
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@ -202,32 +222,33 @@ begin
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if bitCnt = -1 then
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CommunicationState <= TransmitCheck;
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else
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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sbdataout <= CRC(bitCnt);
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sbclk <= '0';
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end if;
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count := count + 1;
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elsif count = countValue and state = 1 then
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elsif count = halfPeriod and state = 1 then
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count := 0;
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state := 0;
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elsif count < countValue and state = 0 then
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elsif count < halfPeriod and state = 0 then
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if count = 0 then
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sbclk <= '1';
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end if;
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count := count + 1;
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elsif count = countValue and state = 0 then
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elsif count = halfPeriod and state = 0 then
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count := 0;
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state := 1;
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bitCnt := bitCnt - 1;
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end if;
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end if;
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else
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count := 0;
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CommunicationState <= Waiting;
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controlBuf(15) <= '1';
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end if;
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when TransmitCheck =>
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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sbclk <= '0';
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end if;
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@ -247,21 +268,21 @@ begin
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CommunicationState <= ReceiveCRC;
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bitCnt := 3;
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else
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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sbclk <= '0';
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end if;
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count := count + 1;
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elsif count = countValue and state = 1 then
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elsif count = halfPeriod and state = 1 then
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dataFromDevices(bitCnt) <= sbdatain;
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count := 0;
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state := 0;
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elsif count < countValue and state = 0 then
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elsif count < halfPeriod and state = 0 then
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if count = 0 then
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sbclk <= '1';
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end if;
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count := count + 1;
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elsif count = countValue and state = 0 then
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elsif count = halfPeriod and state = 0 then
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count := 0;
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state := 1;
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bitCnt := bitCnt - 1;
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@ -271,12 +292,12 @@ begin
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if bitCnt = -1 then
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CommunicationState <= ReceiveCheck;
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else
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if count < countValue and state = 1 then
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if count < halfPeriod and state = 1 then
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if count = 0 then
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sbclk <= '0';
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end if;
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count := count + 1;
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elsif count = countValue and state = 1 then
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elsif count = halfPeriod and state = 1 then
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bufCRC(BitCnt) <= sbdatain;
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count := 0;
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state := 0;
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@ -286,12 +307,12 @@ begin
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dataCRC(15 downto 0) <= dataFromDevices(15 downto 0);
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resetCRC <= '0';
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end if;
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elsif count < countValue and state = 0 then
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elsif count < halfPeriod and state = 0 then
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if count = 0 then
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sbclk <= '1';
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end if;
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count := count + 1;
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elsif count = countValue and state = 0 then
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elsif count = halfPeriod and state = 0 then
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count := 0;
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state := 1;
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bitCnt := bitCnt - 1;
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@ -308,8 +329,11 @@ begin
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else
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controlBuf(12) <= '1';
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end if;
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count := 0;
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CommunicationState <= Waiting;
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when others =>
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count := 0;
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CommunicationState <= Waiting;
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end case;
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startPrev <= start;
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end if;
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