From: notaz <notasas@gmail.com>
Date: Thu, 29 Jun 2023 20:26:04 +0000 (+0300)
Subject: testpico: even more timer stir up
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=635f24506c5a883336e9028e0de7a4a5fb9b2226;p=megadrive.git

testpico: even more timer stir up
---

diff --git a/testpico/asmtools.S b/testpico/asmtools.S
index 6be859a..24b6458 100644
--- a/testpico/asmtools.S
+++ b/testpico/asmtools.S
@@ -12,11 +12,11 @@
 
 .global burn10 /* u16 val */
 burn10:
-    ldarg       0, 0, d0
+    ldargw      0, 0, d0
     subq.l      #1, d0
 0:
-    dbra        d0, 0b
-    rts
+    dbra        d0, 0b      /* 10|14 */
+    rts                     /* 16 */
 
 .global write16_x16 /* u32 a, u16 count, u16 d */
 write16_x16:
@@ -67,6 +67,16 @@ get_input:
 .endif
 	rts
 
+.global get_line
+get_line:
+    movea.l     #0xc00008, a0
+    moveq.l     #0, d0
+0:
+    move.b      (a0), d0    /*  8 d2 = vcnt */
+    cmp.b       (a0), d0    /*  8 reread for super-rare corruption (torn read) */
+    bne         0b
+    rts
+
 .global write_and_read1 /* u32 a, u16 d, void *dst */
 write_and_read1:
     ldarg       0, 0, a0
@@ -483,7 +493,7 @@ test_ym_ab_sync:
 
     ymwrite     a0, a1, #0x27, #0x30  /* 30 disable, clear */
     ymwrite     a0, a1, #0x24, #0xfc  /* 30 timer a */
-    ymwrite     a0, a1, #0x25, #0x01  /* 30  =15 - why 15? expected 16 */
+    ymwrite     a0, a1, #0x25, #0x01  /* 30  =15 */
     ymwrite     a0, a1, #0x26, #0xff  /* 30 timer b shortest interval */
     move.b      #0x27, (a0)           /* 12 addr prep */
     nop
@@ -496,15 +506,19 @@ test_ym_ab_sync:
     move.b      (a0), d0              /*  8 */
     and.b       d1, d0                /*  4 */
     beq         0b                    /* 10|8 */
-0:
+
     move.b      #0x3f, (a1)           /* 12 start a, clear  */
-    move.w      #(1800/10-1), d0      /* waste cycles */
-0:
-    dbra        d0, 0b
 
-    ymwrite     a0, a1, #0x24, #0x00  /* 30 show that rewriting count */
-    ymwrite     a0, a1, #0x25, #0x00  /* 30 does nothing */
-    ymwrite     a0, a1, #0x26, #0x00  /* 30 */
+    move.w      #(488/10), d0         /* waste cycles */
+0:  dbra        d0, 0b
+
+    ymwrite     a0, a1, #0x24, #0xf0  /* 30 show that rewriting count */
+    ymwrite     a0, a1, #0x25, #0x00  /* 30 does nothing until timer expires */
+
+    move.w      #(488*2/10), d0       /* waste cycles */
+0:  dbra        d0, 0b
+
+    ymwrite     a0, a1, #0x26, #0xfc  /* 30 same for timer b */
     ymwrite     a0, a1, #0x27, #0x0f  /* 30 setting already set bits too  */
     moveq.l     #0, d0
     moveq.l     #3, d1
@@ -515,4 +529,20 @@ test_ym_ab_sync:
     move.b      (a0), d0              /* re-read, else very occasionally get 1 */
     rts
 
+.global test_ym_ab_sync2
+test_ym_ab_sync2:
+    movea.l     #0xa04000, a0
+    movea.l     #0xa04001, a1
+
+#    move.b      #0x3f, (a1)           /* 12 clear  */
+    moveq.l     #0, d0
+    moveq.l     #3, d1
+    nop                               /*  4 need ~12c to clear */
+0:
+    move.b      (a0), d0              /*  8 */
+    and.b       d1, d0                /*  4 */
+    beq         0b                    /* 10|8 */
+    move.b      (a0), d0              /* re-read */
+    rts
+
 # vim:filetype=asmM68k:ts=4:sw=4:expandtab
diff --git a/testpico/asmtools.h b/testpico/asmtools.h
index 8711183..0b34a1a 100644
--- a/testpico/asmtools.h
+++ b/testpico/asmtools.h
@@ -11,7 +11,8 @@ void write16_x16(unsigned int addr, unsigned short count, short data);
 #define BTNM_D (1 << 1)
 #define BTNM_U (1 << 0)
 
-int   get_input(void);
+short get_input(void);
+short get_line(void);
 void  write_and_read1(unsigned int a, unsigned short d, void *dst);
 void  move_sr(unsigned short sr);
 short move_sr_and_read(unsigned short sr, unsigned int a);
@@ -27,6 +28,7 @@ void test_v_h_2(void);
 void test_h_v_2(void);
 void test_ym_stopped_tick(void);
 short test_ym_ab_sync(void);
+short test_ym_ab_sync2(void);
 
 extern const char test_hint[];
 extern const char test_hint_end[];
diff --git a/testpico/main.c b/testpico/main.c
index d7ed087..9c07110 100644
--- a/testpico/main.c
+++ b/testpico/main.c
@@ -1235,7 +1235,7 @@ static int t_tim_vcnt_loops(void)
     for (i = 0; i < lines; i++)
         expect_range(ok, ram16[i*2+1], 19, 21);
     expect(ok, ram16[lines*2+0], 0);
-    expect_range(ok, ram16[lines*2+1], 20, 21);
+    expect_range(ok, ram16[lines*2+1], 19, 21);
     return ok;
 }
 
@@ -1409,9 +1409,19 @@ static int t_tim_ym_timerb_stop(void)
 
 static int t_tim_ym_timer_ab_sync(void)
 {
-    u16 v = test_ym_ab_sync();
+    u16 v1, v2, v3, start, line_diff;
     int ok = 1;
-    expect(ok, v, 3);
+    v1 = test_ym_ab_sync();
+    start = get_line();
+    write8(0xa04001, 0x3f);   // clear
+    burn10(3420*11/7/10);     // ~11 scanlines
+    v2 = read8(0xa04000);
+    v3 = test_ym_ab_sync2();
+    line_diff = get_line() - start;
+    expect(ok, v1, 3);
+    expect(ok, v2, 0);
+    expect(ok, v3, 3);
+    expect_range(ok, line_diff, 18, 19);
     return ok;
 }
 
diff --git a/testpico/sega_gcc.s b/testpico/sega_gcc.s
index d4fdc58..1e0116a 100644
--- a/testpico/sega_gcc.s
+++ b/testpico/sega_gcc.s
@@ -16,12 +16,12 @@ exc_tab:
     .ascii "J               "
     .long  0x000000,0x3fffff
     .long  0xff0000,0xffffff
-    .ascii "RA"; .byte 0xf8,0x20                     /* 1b0 */
-    .long  0x200001,0x20ffff                         /* 1b4 */
-    .ascii "    "                                    /* 1bc */
-    .ascii "                        "                /* 1c0 */
-    .ascii "                        "
-    .ascii "JUE             "                        /* 1f0 */
+    .ascii "RA"; .byte 0xf8,0x20                      /* 1b0 */
+    .long  0x200001,0x20ffff                          /* 1b4 */
+    .ascii "    "                                     /* 1bc */
+    .ascii "        "                                 /* 1c0 */
+    .ascii "src: https://github.com/notaz/megadrive/" /* 1c8 */
+    .ascii "JUE             "                         /* 1f0 */
 
 # mystery landing area for reset with 32X on and RV=1
 # 2c8 - 304 in multiples of 4