Difference between revisions of "IOP16 PS/2 Keyboard"
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=== Software Interface === | === Software Interface === | ||
| − | ==== | + | ==== Status register (Read only) ==== |
| + | * Addr = 0 | ||
* Value = 0x00, No data present | * Value = 0x00, No data present | ||
* Value = 0x01, Data present | * Value = 0x01, Data present | ||
| − | ==== | + | ==== Data register (Read only) ==== |
| + | * Addr = 1 | ||
* ASCII Data | * ASCII Data | ||
| + | |||
| + | == PS/2 Keyboard Subroutines == | ||
| + | |||
| + | === Get character from keyboard === | ||
| + | |||
| + | * Blocking routine waits for keypress | ||
| + | * Returns ASCII key value in Reg1 | ||
| + | |||
| + | <pre> | ||
| + | RDKBD JSR WTKBRX WAIT FOR KBD RX CHAR | ||
| + | IOR 0X01 0X0D READ KBD CHAR | ||
| + | RTS | ||
| + | WTKBRX IOR 0X01 0X0C READ KBD STATUS | ||
| + | ARI 0X01 0X01 RX RDY BIT | ||
| + | BEZ WTKBRX LOOP UNTIL CHAR PRESENT | ||
| + | </pre> | ||
| + | |||
| + | === Poll the keyboard === | ||
| + | |||
| + | * Returns keyboard status in Reg1 | ||
| + | ** Returns 0x00 = No key | ||
| + | ** Returns 0x01 - Key was pressed | ||
| + | |||
| + | <pre> | ||
| + | POLLKBD IOR 0X01 0X0C | ||
| + | RTS | ||
| + | </pre> | ||
== Hook-up == | == Hook-up == | ||
| + | |||
| + | * Add to Top Level VHDL code | ||
=== Pins === | === Pins === | ||
| + | |||
| + | * Add to top level entity pins list | ||
<pre> | <pre> | ||
| − | -- PS/2 | + | -- PS/2 |
| − | ps2Clk : inout std_logic; | + | ps2Clk : inout std_logic; |
| − | ps2Data : inout std_logic; | + | ps2Data : inout std_logic; |
| + | </pre> | ||
| + | |||
| + | === Signals === | ||
| + | |||
| + | * Add signal into architecture section | ||
| + | |||
| + | <pre> | ||
| + | -- Decodes/Strobes | ||
| + | ... | ||
| + | signal w_kbcs : std_logic; | ||
| + | |||
| + | -- Interfaces | ||
| + | ... | ||
| + | signal w_KbdData : std_logic_vector(7 downto 0); | ||
</pre> | </pre> | ||
| Line 42: | Line 89: | ||
</pre> | </pre> | ||
| − | === Hook-up === | + | === Hook-up Strobes/Read Mux === |
| + | |||
| + | * Add to strobes and read mux | ||
<pre> | <pre> | ||
| Line 53: | Line 102: | ||
w_KbdData when w_periphAdr(7 downto 1) = "0000110" else | w_KbdData when w_periphAdr(7 downto 1) = "0000110" else | ||
... | ... | ||
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</pre> | </pre> | ||
Latest revision as of 17:59, 16 April 2022
Contents
PS/2 Keyboard
- Wrapper for PS/2 keyboard interfaces
- PS/2 to ASCII conversion
Software Interface
Status register (Read only)
- Addr = 0
- Value = 0x00, No data present
- Value = 0x01, Data present
Data register (Read only)
- Addr = 1
- ASCII Data
PS/2 Keyboard Subroutines
Get character from keyboard
- Blocking routine waits for keypress
- Returns ASCII key value in Reg1
RDKBD JSR WTKBRX WAIT FOR KBD RX CHAR IOR 0X01 0X0D READ KBD CHAR RTS WTKBRX IOR 0X01 0X0C READ KBD STATUS ARI 0X01 0X01 RX RDY BIT BEZ WTKBRX LOOP UNTIL CHAR PRESENT
Poll the keyboard
- Returns keyboard status in Reg1
- Returns 0x00 = No key
- Returns 0x01 - Key was pressed
POLLKBD IOR 0X01 0X0C RTS
Hook-up
- Add to Top Level VHDL code
Pins
- Add to top level entity pins list
-- PS/2 ps2Clk : inout std_logic; ps2Data : inout std_logic;
Signals
- Add signal into architecture section
-- Decodes/Strobes ... signal w_kbcs : std_logic; -- Interfaces ... signal w_KbdData : std_logic_vector(7 downto 0);
VHDL Instance
-- PS/2 keyboard/mapper to ANSI KEYBOARD : ENTITY WORK.Wrap_Keyboard port MAP ( i_CLOCK_50 => i_clk, i_n_reset => w_resetClean_n, i_kbCS => w_kbcs, i_RegSel => w_periphAdr(0), i_rd_Kbd => w_kbcs, i_ps2_clk => ps2Clk, i_ps2_data => ps2Data, o_kbdDat => w_KbdData );
Hook-up Strobes/Read Mux
- Add to strobes and read mux
-- Strobes/Selects
...
w_kbcs <= '1' when (w_periphAdr(7 downto 1) = "0000110") and (w_periphRd = '1') else '0';
-- Peripheral bus read mux
w_periphIn <= ...
w_KbdData when w_periphAdr(7 downto 1) = "0000110" else
...
Resources
- Logic Cells: 708
- Registers: 95
- Memory Bits: 0
- M9Ks: 0
