Initial commit.

1 files changed, 211 insertions, 0 deletions

diff --git a/hdl/front_panel.sv b/hdl/front_panel.sv
new file mode 100644
index 0000000..52b4bdb
--- /dev/null
+++ b/hdl/front_panel.sv
@@ -0,0 +1,211 @@
+module front_panel
+    #(  DEBOUNCE_MAX    = 100
+    )
+    (   input   bit clk
+    ,   input   bit reset
+
+    ,   input   bit [8:1][12:1] led
+    ,   output  bit [3:1][12:1] switch
+
+    ,   inout   wire [10:1]  gpioa
+    ,   inout   wire [28:13] gpiob
+    ,   inout   wire [40:31] gpioc
+    );
+
+localparam DEBOUNCE_BITS = $clog2(DEBOUNCE_MAX+1);
+
+enum
+    {   LED_ROW1
+    ,   DEAD_ROW2
+    ,   LED_ROW2
+    ,   DEAD_ROW3
+    ,   LED_ROW3
+    ,   DEAD_ROW4
+    ,   LED_ROW4
+    ,   DEAD_ROW5
+    ,   LED_ROW5
+    ,   DEAD_ROW6
+    ,   LED_ROW6
+    ,   DEAD_ROW7
+    ,   LED_ROW7
+    ,   DEAD_ROW8
+    ,   LED_ROW8
+    ,   DEAD_ROW9
+    ,   SWITCH_PREP
+    ,   SWITCH_ROW1
+    ,   SWITCH_ROW2
+    ,   SWITCH_ROW3
+    } state;
+
+bit [3:1][12:1] switch_raw;
+bit [DEBOUNCE_BITS-1:0] switch_debounce;
+
+`define LEDROW1 gpioc[38]
+`define LEDROW2 gpioc[40]
+`define LEDROW3 gpiob[15]
+`define LEDROW4 gpiob[16]
+`define LEDROW5 gpiob[18]
+`define LEDROW6 gpiob[22]
+`define LEDROW7 gpioc[37]
+`define LEDROW8 gpiob[13]
+
+`define SWROW1  gpioc[36]
+`define SWROW2  gpioa[1]
+`define SWROW3  gpioa[2]
+
+`define COL1    gpioa[8]
+`define COL2    gpioa[10]
+`define COL3    gpioa[7]
+`define COL4    gpiob[27]
+`define COL5    gpioc[31]
+`define COL6    gpiob[26]
+`define COL7    gpiob[24]
+`define COL8    gpiob[21]
+`define COL9    gpiob[19]
+`define COL10   gpiob[23]
+`define COL11   gpioc[32]
+`define COL12   gpioc[33]
+
+`define DO_LEDS
+`define DO_SWITCHES
+
+always_ff @(posedge clk) begin
+    // LED rows (active high)
+    `LEDROW1    = 1'b0;
+    `LEDROW2    = 1'b0;
+    `LEDROW3    = 1'b0;
+    `LEDROW4    = 1'b0;
+    `LEDROW5    = 1'b0;
+    `LEDROW6    = 1'b0;
+    `LEDROW7    = 1'b0;
+    `LEDROW8    = 1'b0;
+
+    // Switch rows (active low)
+    `SWROW1     = 1'b1;
+    `SWROW2     = 1'b1;
+    `SWROW3     = 1'b1;
+
+    if (reset) begin
+        switch = 0;
+        switch_raw = 0;
+        switch_debounce = 0;
+        state = state.first;
+    end else begin
+        automatic bit [3:1][12:1] new_switch = switch_raw;
+
+        case (state)
+`ifdef DO_LEDS
+`define LED_ROW(n) \
+            LED_ROW``n: begin \
+                `LEDROW``n  = 1'b1; \
+                `COL1       = ~led[n][1]; \
+                `COL2       = ~led[n][2]; \
+                `COL3       = ~led[n][3]; \
+                `COL4       = ~led[n][4]; \
+                `COL5       = ~led[n][5]; \
+                `COL6       = ~led[n][6]; \
+                `COL7       = ~led[n][7]; \
+                `COL8       = ~led[n][8]; \
+                `COL9       = ~led[n][9]; \
+                `COL10      = ~led[n][10]; \
+                `COL11      = ~led[n][11]; \
+                `COL12      = ~led[n][12]; \
+            end
+
+            `LED_ROW(1)
+            `LED_ROW(2)
+            `LED_ROW(3)
+            `LED_ROW(4)
+            `LED_ROW(5)
+            `LED_ROW(6)
+            `LED_ROW(7)
+            `LED_ROW(8)
+`endif
+
+`ifdef DO_SWITCHES
+            SWITCH_PREP: begin
+                `SWROW1 = 1'b0;
+
+                `COL1   = 1'bZ;
+                `COL2   = 1'bZ;
+                `COL3   = 1'bZ;
+                `COL4   = 1'bZ;
+                `COL5   = 1'bZ;
+                `COL6   = 1'bZ;
+                `COL7   = 1'bZ;
+                `COL8   = 1'bZ;
+                `COL9   = 1'bZ;
+                `COL10  = 1'bZ;
+                `COL11  = 1'bZ;
+                `COL12  = 1'bZ;
+            end
+
+            SWITCH_ROW1: begin
+                `SWROW2 = 1'b0;
+
+                new_switch[1][1]    = ~`COL1;
+                new_switch[1][2]    = ~`COL2;
+                new_switch[1][3]    = ~`COL3;
+                new_switch[1][4]    = ~`COL4;
+                new_switch[1][5]    = ~`COL5;
+                new_switch[1][6]    = ~`COL6;
+                new_switch[1][7]    = ~`COL7;
+                new_switch[1][8]    = ~`COL8;
+                new_switch[1][9]    = ~`COL9;
+                new_switch[1][10]   = ~`COL10;
+                new_switch[1][11]   = ~`COL11;
+                new_switch[1][12]   = ~`COL12;
+            end
+
+            SWITCH_ROW2: begin
+                `SWROW3 = 1'b0;
+
+                new_switch[2][1]    = ~`COL1;
+                new_switch[2][2]    = ~`COL2;
+                new_switch[2][3]    = ~`COL3;
+                new_switch[2][4]    = ~`COL4;
+                new_switch[2][5]    = ~`COL5;
+                new_switch[2][6]    = ~`COL6;
+                new_switch[2][7]    = ~`COL7;
+                new_switch[2][8]    = ~`COL8;
+                new_switch[2][9]    = ~`COL9;
+                new_switch[2][10]   = ~`COL10;
+                new_switch[2][11]   = ~`COL11;
+                new_switch[2][12]   = ~`COL12;
+            end
+
+            SWITCH_ROW3: begin
+                new_switch[3][1]    = ~`COL1;
+                new_switch[3][2]    = ~`COL2;
+                new_switch[3][3]    = ~`COL3;
+                new_switch[3][4]    = ~`COL4;
+                new_switch[3][5]    = ~`COL5;
+                new_switch[3][6]    = ~`COL6;
+                new_switch[3][7]    = ~`COL7;
+                new_switch[3][8]    = ~`COL8;
+                new_switch[3][9]    = ~`COL9;
+                new_switch[3][10]   = ~`COL10;
+                new_switch[3][11]   = ~`COL11;
+                new_switch[3][12]   = ~`COL12;
+            end
+`endif
+        endcase
+
+        if (state == state.last)
+            state = state.first;
+        else
+            state = state.next;
+
+        if (new_switch == switch_raw) begin
+            if (switch_debounce == 0)
+                switch = switch_raw;
+            else
+                --switch_debounce;
+        end else begin
+            switch_raw = new_switch;
+            switch_debounce = DEBOUNCE_MAX;
+        end
+    end
+end
+
+endmodule