ping-pong game.S

resources/ping-pong-mips32/game/game/game.S

@@ -6,61 +6,222 @@
     .set noat
 
 
+    .section .rodata
+    .p2align 2
+
+pause:
+    .asciz "pause\n"
+
+
     .section .bss
     .p2align 2
 
+    .word 0
+    .word 0
+kb_buffer:
+    .rept 32
+    .word 0
+    .endr
+score:
+    .word 0
+button_state:
+    .word 0
+.global pause_state
+pause_state:
+    .word 0
+
 
     .section .text
     .p2align 2
 
     .global GAME_START
 GAME_START:
+    li t6, 1
+    lui t0, %hi(SWITCH) + 1
+    lui t1, %hi(BUTTON) + 1
+    lw t2, %lo(SWITCH)(t0)
+    beqz t2, 1f
+    lw t3, %lo(BUTTON)(t1)
+    lui t0, %hi(pause_state)
+    li t2, 0x1
+    sw t2, %lo(pause_state)(t0)
+    la a0, UART0
+    la a1, pause
+    jal PRINT
     nop
+    lui t0, %hi(next_thread)
+    la t1, SUPV_TCB
+    sw t1, %lo(t0)
+    syscall
+1:
+    lui t0, %hi(button_state)
+    lw t2, %lo(button_state)(t0)
+    xor t2, t2, zero
+    sw t3, %lo(button_state)(t0)
+    and t3, t2, t3
+    andi t0, t3, 0x1
+    andi t1, t3, 0x2
+    slti t2, player1_y, HEIGHT - 1
+    beqz t0, 2f
+    slt t3, t6, player1_y
+    add player1_y, player1_y, t2
+2:
+    beqz t1, 3f
+    sltu t0, ball_cntx, ball_spx
+    sub player1_y, player1_y, t3
+3:
+    bnez t0, 4f
+    sltu t1, ball_cnty, ball_spy
+    add ball_x, ball_x, ball_dx
+    li ball_cntx, 0
+    slt t2, t6, ball_x
+    slti t3, ball_x, HEIGHT
+    and t0, t2, t3
+    sll t0, t0, 1
+    addiu t0, t0, -2
+    xor ball_dx, ball_dx, t0
+4:
+    bnez t1, 5f
     nop
+    add ball_y, ball_y, ball_dy
+    li ball_cnty, 0
+    sltiu t1, ball_dy, 1
+    slt t2, t6, ball_y
+    slti t3, ball_y, HEIGHT
+    and t0, t2, t3
+    or t0, t1, t0
+    sll t0, t0, 1
+    addiu t0, t0, -2
+    xor ball_dy, ball_dy, t0
+5:
+    la t0, kb_buffer
+    lw t2, -8(t0)
+    lw t3, -4(t0)
+    beq t2, t3, 8f
+    addiu t1, t0, t2
+    j kb_readbuffer
+    lw t5, 0(t1)
+kb_readbuffer_loop:
+    andi t2, t2, 0x7c
+    beq t2, t3, 8f
+    addiu t1, t0, t2
+    lw t5, 0(t1)
+kb_readbuffer:
+    li t1, KB_PAUSE
+    bne t5, t1, 6f
     nop
+    lui v0, %hi(pause_state)
+    li t1, 0x2
+    sw t1, %lo(pause_state)(v0)
+    la a0, UART0
+    la a1, pause
+    jal PRINT
     nop
+    lui v0, %hi(next_thread)
+    la t1, SUPV_TCB
+    sw t1, %lo(v0)
+    syscall
+    j kb_readbuffer_loop
+    addiu t2, t2, 4
+6:
+    li t1, KB_UP
+    bne t5, t1, 7f
+    slti t1, player2_y, HEIGHT - 1
+    beqz t1, kb_readbuffer_loop
+    addiu t2, t2, 4
+    j kb_readbuffer_loop
+    add player2_y, player2_y, t1
+7:
+    li t1, KB_DOWN
+    bne t5, t1, kb_readbuffer_loop
+    addiu t2, t2, 4
+    slt t1, t6, player2_y
+    beqz t1, kb_readbuffer_loop
     nop
-    nop
+    j kb_readbuffer_loop
-    nop
+    sub player2_y, player2_y, t1
-    nop
+8:
+    sw t2, -8(t0)
+// TODO
     j GAME_START
     nop
 
     .global GAME_TIMER
 GAME_TIMER:
-    j RESTART
+    addi sp, sp, -16
+    sw ra, 12(sp)
+    sw a1, 8(sp)
+    sw a0, 4(sp)
+    sw v0, 0(sp)
+    addiu ball_cntx, ball_cntx, 1
+    addiu ball_cnty, ball_cnty, 1
+    la a0, UART0
+    ori a1, player1_y, 0x80
+    jal WRITESERIAL
     nop
-
+    ori a1, player2_y, 0x80
-    .global GAME_KB0
+    jal WRITESERIAL
-GAME_KB0:
-    j RESTART
     nop
+    ori a1, ball_x, 0x80
+    jal WRITESERIAL
+    nop
+    ori a1, ball_y, 0x80
+    jal WRITESERIAL
+    nop
+    li a1, 0x0A // '\n'
+    jal WRITESERIAL
+    nop
+    mtc0 zero, CP0_COUNT
+    lw v0, 0(sp)
+    lw a0, 4(sp)
+    lw a1, 8(sp)
+    lw ra, 12(sp)
+    j RESTART
+    addi sp, sp, 16
 
     .global GAME_KB1
 GAME_KB1:
-    addi sp, sp, -16
+    addi sp, sp, -24
-    sw ra, 12(sp)
+    sw ra, 20(sp)
+    sw t1, 16(sp)
+    sw t0, 12(sp)
     sw a0, 8(sp)
     sw v1, 4(sp)
     sw v0, 0(sp)
-    la k0, RESTART
 
     la a0, UART1
-0:
+    la t0, kb_buffer
+    lw k0, -8(t0)
+    lw k1, -4(t0)
+kb_writebuffer:
+    addiu k1, k1, 4
+    andi k1, k1, 0x7c
+    beq k0, k1, 1f
+    nop
     jal TRYREADSERIAL
     nop
-    beqz v1, 1f
+    beqz v1, 2f
-    nop
+    addiu t1, t0, k0
-
+    sw v0, 0(t1)
-    j 0b
+    j kb_writebuffer
     nop
 1:
+    jal TRYREADSERIAL
+    nop
+    bnez v1, 1b
+    nop
+2:
+    addiu k1, k1, -4
     lw v0, 0(sp)
+    andi k1, k1, 0x7c
     lw v1, 4(sp)
+    sw k1, -4(t0)
     lw a0, 8(sp)
-    lw ra, 12(sp)
+    lw t0, 12(sp)
-    jr k0
+    lw t1, 16(sp)
-    addi sp, sp, 16
+    lw ra, 20(sp)
+    j RESTART
+    addi sp, sp, 24
 
 
     .set reorder

resources/ping-pong-mips32/game/game/game.ld

@@ -5,6 +5,9 @@ OUTPUT_FORMAT("elf32-tradlittlemips")
 
 PROVIDE(SPVR_STACK_INIT = 0x807E0000);
 PROVIDE(GAME_STACK_INIT = 0x807F0000);
+PROVIDE(SEG7            = 0xBFAFF010);
+PROVIDE(SWITCH          = 0xBFAFF020);
+PROVIDE(BUTTON          = 0xBFAFF028);
 PROVIDE(UART0           = 0xBFE40000);
 PROVIDE(UART1           = 0xBFE40010);
 SECTIONS

resources/ping-pong-mips32/game/game/init.S

@@ -1,6 +1,7 @@
 #include <regdef.h>
 #include <mipsregs.h>
 #include <exception.h>
+#include <game.h>
 
     .set noreorder
     .set noat
@@ -9,8 +10,8 @@
     .section .rodata
     .p2align 2
 
-pingpong_hello:
+pingpong:
-    .asciz "Ping Pong."
+    .asciz "Ping Pong.\n"
 
 
     .section .data
@@ -78,17 +79,9 @@ GAME_TCB:
     .word DEFAULT_INT_HANDLER
     .word DEFAULT_INT_HANDLER
     .word DEFAULT_INT_HANDLER
+    .word GAME_KB1
     .word DEFAULT_INT_HANDLER
-    .word DEFAULT_INT_HANDLER
+    .word GAME_TIMER
-    .word DEFAULT_INT_HANDLER
-    .word 0
-    .word 0
-    .word 0
-    .word 0
-    .word 0
-    .word 0
-    .word 0
-    .word 0
     .word 0
     .word 0
     .word 0
@@ -103,8 +96,27 @@ GAME_TCB:
     .word 0
     .word 0
     .word 0
+    // random
+    .word 0xBFC00380
+    // player1
+    .word center_y
+    // player2
+    .word center_y
+    // ball_x
+    .word center_x
+    // ball_y
+    .word center_y
+    // ball_cntx
     .word 0
+    // ball_cnty
     .word 0
+    // ball_spx
+    .word x_sp3
+    // ball_spy
+    .word y_sp3
+    // ball_dx
+    .word -1
+    // ball_dy
     .word 0
     // gp
     .word 0
@@ -117,9 +129,9 @@ GAME_TCB:
     // Count
     .word 0
     // Compare
-    .word 33000000 / 2
+    .word 16500000 / fps
     // STATUS
-    .word STATUSF_IP7 | STATUSF_IP5 | STATUSF_IP4 | ST0_IE
+    .word IE_IRQ5 | IE_IRQ3 | IE_IRQ2 | ST0_IE
     // EPC
     .word GAME_START
 
@@ -178,7 +190,7 @@ bss_init_done:
     sb  t1, 2(t0)   // FIFO
     li  t1, 0x80    // CFCR_DLAB, divisor latch
     sb  t1, 3(t0)   // CFCR
-    li  t1, 0x23    // modify Baud 57600
+    li  t1, 0x1b    // modify Baud 76388.89
     sb  t1, 0(t0)   // DATA
     srl t1, 8
     sb  t1, 1(t0)   // IER
@@ -191,14 +203,9 @@ bss_init_done:
     li  t1, 0x1     // IRxE
     sb  t1, 1(t0)   // IER
 
-    la s0, pingpong_hello
     la a0, UART0
-    lb a1, 0(s0)
+    la a1, pingpong
-0:
+    jal PRINT
-    jal WRITESERIAL
-    addiu s0, s0, 0x1
-    lb a0, 0(s0)
-    bne a0, zero, 0b
     nop
 
     j RESTART_LOAD

resources/ping-pong-mips32/game/game/trap.S

@@ -19,13 +19,13 @@
     sw k1, TF_STATUS(k0)
 
     mfc0 k0, CP0_CAUSE
-    andi k1, k0, 0x00FC
+    andi k1, k0, CAUSEF_EXCCODE
     bnez k1, SYSCALL
     nop
     mfc0 k1, CP0_STATUS
     and k0, k0, k1
 7:
-    andi k1, k0, CAUSEF_IP7
+    andi k1, k0, C_IRQ5
     beqz k1, 6f
     nop
     lui k0, %hi(current_thread)
@@ -34,7 +34,7 @@
     jr k1
     nop
 6:
-    andi k1, k0, CAUSEF_IP6
+    andi k1, k0, C_IRQ4
     beqz k1, 5f
     nop
     lui k0, %hi(current_thread)
@@ -43,7 +43,7 @@
     jr k1
     nop
 5:
-    andi k1, k0, CAUSEF_IP5
+    andi k1, k0, C_IRQ3
     beqz k1, 4f
     nop
     lui k0, %hi(current_thread)
@@ -52,7 +52,7 @@
     jr k1
     nop
 4:
-    andi k1, k0, CAUSEF_IP4
+    andi k1, k0, C_IRQ2
     beqz k1, 3f
     nop
     lui k0, %hi(current_thread)
@@ -61,7 +61,7 @@
     jr k1
     nop
 3:
-    andi k1, k0, CAUSEF_IP3
+    andi k1, k0, C_IRQ1
     beqz k1, 2f
     nop
     lui k0, %hi(current_thread)
@@ -70,7 +70,7 @@
     jr k1
     nop
 2:
-    andi k1, k0, CAUSEF_IP2
+    andi k1, k0, C_IRQ0
     beqz k1, 1f
     nop
     lui k0, %hi(current_thread)
@@ -79,7 +79,7 @@
     jr k1
     nop
 1:
-    andi k1, k0, CAUSEF_IP1
+    andi k1, k0, C_SW1
     beqz k1, 0f
     nop
     lui k0, %hi(current_thread)
@@ -102,11 +102,6 @@ SYSCALL:
     addiu k1, k1, 0x4
     mtc0 k1, CP0_EPC
 
-    .global DEFAULT_INT_HANDLER
-DEFAULT_INT_HANDLER:
-    j RESTART
-    nop
-
     .global RESTART_SAVE
 RESTART_SAVE:
     lui k0, %hi(current_thread)
@@ -198,6 +193,11 @@ RESTART:
     j RESTART
     nop
 
+    .global DEFAULT_INT_HANDLER
+DEFAULT_INT_HANDLER:
+    j RESTART
+    nop
+
 
     .set reorder
     .set at

resources/ping-pong-mips32/game/game/utils.S

@@ -10,20 +10,33 @@
     .global WRITESERIAL
 WRITESERIAL:
 1:
-    lb   t0, 5(a0)
+    lb   v0, 5(a0)
-    andi t0, t0, 0x20
+    andi v0, v0, 0x20
-    beqz t0, 1b
+    beqz v0, 1b
     nop
     sb   a1, 0(a0)
     jr   ra
     nop
 
+    .global PRINT
+PRINT:
+    move v1, a1
+    lb a1, 0(a1)
+1:
+    jal WRITESERIAL
+    addiu v1, v1, 0x1
+    lb a1, 0(v1)
+    bne a1, zero, 1b
+    nop
+    jr   ra
+    nop
+
     .global READSERIAL
 READSERIAL:
 1:
-    lb   t0, 5(a0)
+    lb   v0, 5(a0)
-    andi t0, t0, 0x01
+    andi v0, v0, 0x01
-    beqz t0, 1b
+    beqz v0, 1b
     nop
     lb   v0, 0(a0)
     jr   ra

resources/ping-pong-mips32/game/include/game.h

@@ -8,4 +8,38 @@
 #define KB_SCORE  0xEB
 #define KB_RESET  0xF3
 
+#define fps       30
+
+#define x_sp0     10
+#define x_sp1     20
+#define x_sp2     30
+#define x_sp3     45
+#define x_sp4     60
+
+#define y_sp0     30
+#define y_sp1     60
+#define y_sp2     90
+#define y_sp3     120
+#define y_sp4     150
+
+#define WIDTH     81
+#define HEIGHT    25
+#define center_x  40
+#define center_y  13
+
+#define player1_x 5
+#define player2_x (WIDTH - player1_x + 1)
+
+#define random    $15
+#define player1_y $16
+#define player2_y $17
+#define ball_x    $18
+#define ball_y    $19
+#define ball_cntx $20
+#define ball_cnty $21
+#define ball_spx  $22
+#define ball_spy  $23
+#define ball_dx   $24
+#define ball_dy   $25
+
 #endif