[megadrive.git] / megaed-sv / main.c

#include <stdarg.h>

#define u8      unsigned char
#define u16     unsigned short
#define u32     unsigned int

#define noinline __attribute__((noinline))

#include "edos.h"
#include "asmtools.h"

#define GFX_DATA_PORT    0xC00000
#define GFX_CTRL_PORT    0xC00004

#define TILE_MEM_END     0xB000

#define FONT_LEN         128
#define TILE_FONT_BASE   (TILE_MEM_END / 32  - FONT_LEN)

/* note: using ED menu's layout here.. */
#define WPLAN            (TILE_MEM_END + 0x0000)
#define HSCRL            (TILE_MEM_END + 0x0800)
#define SLIST            (TILE_MEM_END + 0x0C00)
#define APLANE           (TILE_MEM_END + 0x1000)
#define BPLANE           (TILE_MEM_END + 0x3000)

#define write16(a, d) \
    *((volatile u16 *) (a)) = (d)
#define write32(a, d) \
    *((volatile u32 *) (a)) = (d)

#define GFX_WRITE_VRAM_ADDR(adr) \
    (((0x4000 | ((adr) & 0x3FFF)) << 16) | ((adr) >> 14) | 0x00)
#define GFX_WRITE_VSRAM_ADDR(adr) \
    (((0x4000 | ((adr) & 0x3FFF)) << 16) | ((adr) >> 14) | 0x10)

enum {
    VDP_MODE1 = 0x00,
    VDP_MODE2 = 0x01,
    VDP_BACKDROP = 0x07,
    VDP_MODE3 = 0x0b,
    VDP_MODE4 = 0x0c,
    VDP_AUTOINC = 0x0f,
    VDP_SCROLLSZ = 0x10,
};

/* cell counts */
#define LEFT_BORDER 1   /* lame TV */
#define PLANE_W 64
#define PLANE_H 32
#define CSCREEN_H 28

static noinline void VDP_drawTextML(const char *str, u16 plane_base,
    u16 x, u16 y)
{
    const u8 *src = (const u8 *)str;
    u16 basetile = 0;
    int max_len = 40 - LEFT_BORDER;
    int len;
    u32 addr;

    x += LEFT_BORDER;

    for (len = 0; str[len] && len < max_len; len++)
        ;
    if (len > (PLANE_W - x))
        len = PLANE_W - x;

    addr = plane_base + ((x + (PLANE_W * y)) << 1);
    write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(addr));

    while (len-- > 0) {
        write16(GFX_DATA_PORT,
            basetile | ((*src++) - 32 + TILE_FONT_BASE));
    }
}

static int printf_ypos;

static void printf_line(int x, const char *buf)
{
    u32 addr;
    int i;

    VDP_drawTextML(buf, APLANE, x, printf_ypos++ & (PLANE_H - 1));

    if (printf_ypos >= CSCREEN_H) {
        /* clear next line */
        addr = APLANE;
        addr += (PLANE_W * (printf_ypos & (PLANE_H - 1))) << 1;
        write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(addr));
        for (i = 0; i < 40 / 2; i++)
            write32(GFX_DATA_PORT, 0);

        /* scroll plane */
        write32(GFX_CTRL_PORT, GFX_WRITE_VSRAM_ADDR(0));
        write16(GFX_DATA_PORT, (printf_ypos - 27) * 8);
    }
}

#define PRINTF_LEN 40

static noinline int printf(const char *fmt, ...)
{
    static const char hexchars[] = "0123456789abcdef";
    static int printf_xpos;
    char c, buf[PRINTF_LEN + 11 + 1];
    const char *s;
    va_list ap;
    int ival;
    u32 uval;
    int d = 0;
    int i, j;

    va_start(ap, fmt);
    for (d = 0; *fmt; ) {
        int prefix0 = 0;
        int fwidth = 0;

        c = *fmt++;
        if (d < PRINTF_LEN)
            buf[d] = c;

        if (c != '%') {
            if (c == '\n') {
                buf[d] = 0;
                printf_line(printf_xpos, buf);
                d = 0;
                printf_xpos = 0;
                continue;
            }
            d++;
            continue;
        }
        if (d >= PRINTF_LEN)
            continue;

        if (*fmt == '0') {
            prefix0 = 1;
            fmt++;
        }

        while ('1' <= *fmt && *fmt <= '9') {
            fwidth = fwidth * 10 + *fmt - '0';
            fmt++;
        }

        switch (*fmt++) {
        case '%':
            d++;
            break;
        case 'd':
        case 'i':
            ival = va_arg(ap, int);
            if (ival < 0) {
                buf[d++] = '-';
                ival = -ival;
            }
            for (i = 1000000000; i >= 10; i /= 10)
                if (ival >= i)
                    break;
            for (; i >= 10; i /= 10) {
                buf[d++] = '0' + ival / i;
                ival %= i;
            }
            buf[d++] = '0' + ival;
            break;
        case 'x':
            uval = va_arg(ap, int);
            while (fwidth > 0 && uval < (1 << (fwidth - 1) * 4)) {
                buf[d++] = prefix0 ? '0' : ' ';
                fwidth--;
            }
            for (j = 1; j < 8 && uval >= (1 << j * 4); j++)
                ;
            for (j--; j >= 0; j--)
                buf[d++] = hexchars[(uval >> j * 4) & 0x0f];
            break;
        case 's':
            s = va_arg(ap, char *);
            while (*s && d < PRINTF_LEN)
                buf[d++] = *s++;
            break;
        default:
            // don't handle, for now
            d++;
            va_arg(ap, void *);
            break;
        }
    }
    buf[d] = 0;
    va_end(ap);

    if (d != 0) {
        // line without \n
        VDP_drawTextML(buf, APLANE, printf_xpos,
            printf_ypos & (PLANE_H - 1));
        printf_xpos += d;
    }

    return d; // wrong..
}

void exception(void)
{
    VDP_drawTextML("============", APLANE, 0, 0);
    VDP_drawTextML(" exception! ", APLANE, 0, 1);
    VDP_drawTextML("============", APLANE, 0, 2);
    while (1)
        ;
}

void vbl(void)
{
}

static int usb_read_while_ready(OsRoutine *ed,
    void *buf_, int maxlen)
{
    u8 *buf = buf_;
    int r = 0;

    while (ed->usbRdReady() && r < maxlen)
        buf[r++] = ed->usbReadByte();

    return r;
}

/*
 * TH = 1 : ?1CBRLDU    3-button pad return value (not read)
 * TH = 0 : ?0SA00DU    3-button pad return value
 * TH = 1 : ?1CBRLDU    3-button pad return value
 * TH = 0 : ?0SA0000    D3-0 are forced to '0'
 * TH = 1 : ?1CBMXYZ    Extra buttons returned in D3-0
 * TH = 0 : ?0SA1111    D3-0 are forced to '1'
 */
static void test_joy_latency(int *min_out, int *max_out)
{
    u8 rbuf[8 * 6];
    int min = 8;
    int max = 0;
    int i, v, b, e;

    for (i = 0; i < 64; i++) {
        read_joy_responses(rbuf);

        for (b = 0; b < 8 * 4; b++) {
            v = b & 7;
            e = (b & 0x08) ? 0x0c : 0;
            if ((rbuf[b] & 0x0c) == e) {
                if (v < min)
                    min = v;
            }
            else if (v > max)
                max = v;
        }
    }

    /* print out the last test */
    for (b = 0; b < 8 * 5; b++) {
        printf(" %02x", rbuf[b]);
        if ((b & 7) == 7)
            printf("\n");
    }
    printf("\n");

    *min_out = min;
    *max_out = max;
}

static int do_test(OsRoutine *ed, u8 b3)
{
    int min = 0, max = 0;

    switch (b3)
    {
    case 'j':
        test_joy_latency(&min, &max);
        printf("latency: %d - %d\n\n", min, max);
        return 0;
    default:
        break;
    }

    return -1;
}

int main()
{
    OsRoutine *ed;
    u8 buf[16];
    int i, d, ret;

    ed = (OsRoutine *) *(u32 *)0x1A0;
    ed->memInitDmaCode(); 

    ed->VDP_setReg(VDP_MODE1, 0x04); 
    ed->VDP_setReg(VDP_MODE2, 0x64); 
    ed->VDP_setReg(VDP_AUTOINC, 2); 
    ed->VDP_setReg(VDP_SCROLLSZ, 0x01); 

    /* clear name tables */
    write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(APLANE));
    for (i = 0; i < PLANE_W * PLANE_H / 2; i++)
        write32(GFX_DATA_PORT, 0);

    write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(BPLANE));
    for (i = 0; i < PLANE_W * PLANE_H / 2; i++)
        write32(GFX_DATA_PORT, 0);

    /* note: relying on ED menu's font setup here.. */

    for (;;) {
        if (!ed->usbRdReady()) {
            asm volatile("stop #0x2000");
            continue;
        }

        buf[0] = ed->usbReadByte();
        if (buf[0] == ' ')
            continue;
        if (buf[0] != '*') {
            d = 1;
            goto bad_input;
        }

        /* note: OS uses Twofgsr */
        buf[1] = ed->usbReadByte();
        switch (buf[1]) {
        case 'T':
            ed->usbWriteByte('k');
            break;
        /* custom */
        case 't':
            buf[2] = ed->usbReadByte();
            ret = do_test(ed, buf[2]);
            if (ret != 0) {
                d = 3;
                goto bad_input;
            }
            ed->usbWriteByte('k');
            break;
        default:
            d = 2;
            goto bad_input;
        }

        continue;

bad_input:
        ret = usb_read_while_ready(ed, buf + d, sizeof(buf) - d);
        buf[d + ret] = 0;
        printf("bad cmd: %s\n", buf);
        /* consume all remaining data */
        while (ed->usbRdReady())
            usb_read_while_ready(ed, buf, sizeof(buf));

        ed->usbWriteByte('b');
    }

    return 0;
}

// vim:ts=4:sw=4:expandtab
Commit	Line	Data
ab6ed3c4	1	#include <stdarg.h>
	2
	3	#define u8 unsigned char
	4	#define u16 unsigned short
	5	#define u32 unsigned int
	6
	7	#define noinline __attribute__((noinline))
	8
	9	#include "edos.h"
51f3a685	10	#include "asmtools.h"
ab6ed3c4	11
	12	#define GFX_DATA_PORT 0xC00000
	13	#define GFX_CTRL_PORT 0xC00004
	14
	15	#define TILE_MEM_END 0xB000
	16
	17	#define FONT_LEN 128
	18	#define TILE_FONT_BASE (TILE_MEM_END / 32 - FONT_LEN)
	19
	20	/* note: using ED menu's layout here.. */
	21	#define WPLAN (TILE_MEM_END + 0x0000)
	22	#define HSCRL (TILE_MEM_END + 0x0800)
	23	#define SLIST (TILE_MEM_END + 0x0C00)
	24	#define APLANE (TILE_MEM_END + 0x1000)
	25	#define BPLANE (TILE_MEM_END + 0x3000)
	26
	27	#define write16(a, d) \
	28	((volatile u16 ) (a)) = (d)
	29	#define write32(a, d) \
	30	((volatile u32 ) (a)) = (d)
	31
	32	#define GFX_WRITE_VRAM_ADDR(adr) \
	33	(((0x4000 \| ((adr) & 0x3FFF)) << 16) \| ((adr) >> 14) \| 0x00)
	34	#define GFX_WRITE_VSRAM_ADDR(adr) \
	35	(((0x4000 \| ((adr) & 0x3FFF)) << 16) \| ((adr) >> 14) \| 0x10)
	36
	37	enum {
	38	VDP_MODE1 = 0x00,
	39	VDP_MODE2 = 0x01,
	40	VDP_BACKDROP = 0x07,
	41	VDP_MODE3 = 0x0b,
	42	VDP_MODE4 = 0x0c,
	43	VDP_AUTOINC = 0x0f,
	44	VDP_SCROLLSZ = 0x10,
	45	};
	46
	47	/* cell counts */
	48	#define LEFT_BORDER 1 /* lame TV */
	49	#define PLANE_W 64
	50	#define PLANE_H 32
	51	#define CSCREEN_H 28
	52
	53	static noinline void VDP_drawTextML(const char *str, u16 plane_base,
	54	u16 x, u16 y)
	55	{
	56	const u8 src = (const u8 )str;
	57	u16 basetile = 0;
	58	int max_len = 40 - LEFT_BORDER;
	59	int len;
	60	u32 addr;
	61
	62	x += LEFT_BORDER;
	63
	64	for (len = 0; str[len] && len < max_len; len++)
	65	;
	66	if (len > (PLANE_W - x))
	67	len = PLANE_W - x;
	68
	69	addr = plane_base + ((x + (PLANE_W * y)) << 1);
	70	write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(addr));
	71
	72	while (len-- > 0) {
	73	write16(GFX_DATA_PORT,
	74	basetile \| ((*src++) - 32 + TILE_FONT_BASE));
75	}
76	}
77
78	static int printf_ypos;
79
80	static void printf_line(int x, const char *buf)
81	{
82	u32 addr;
83	int i;
84
ab6ed3c4	85	VDP_drawTextML(buf, APLANE, x, printf_ypos++ & (PLANE_H - 1));
	86
	87	if (printf_ypos >= CSCREEN_H) {
	88	/* clear next line */
	89	addr = APLANE;
	90	addr += (PLANE_W * (printf_ypos & (PLANE_H - 1))) << 1;
	91	write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(addr));
	92	for (i = 0; i < 40 / 2; i++)
	93	write32(GFX_DATA_PORT, 0);
	94
	95	/* scroll plane */
	96	write32(GFX_CTRL_PORT, GFX_WRITE_VSRAM_ADDR(0));
	97	write16(GFX_DATA_PORT, (printf_ypos - 27) * 8);
	98	}
	99	}
	100
51f3a685	101	#define PRINTF_LEN 40
51f3a685	102
ab6ed3c4	103	static noinline int printf(const char *fmt, ...)
ab6ed3c4	104	{
51f3a685	105	static const char hexchars[] = "0123456789abcdef";
ab6ed3c4	106	static int printf_xpos;
51f3a685	107	char c, buf[PRINTF_LEN + 11 + 1];
51f3a685	108	const char *s;
ab6ed3c4	109	va_list ap;
ab6ed3c4	110	int ival;
51f3a685	111	u32 uval;
ab6ed3c4	112	int d = 0;
51f3a685	113	int i, j;
ab6ed3c4	114
	115	va_start(ap, fmt);
	116	for (d = 0; *fmt; ) {
51f3a685	117	int prefix0 = 0;
	118	int fwidth = 0;
	119
	120	c = *fmt++;
	121	if (d < PRINTF_LEN)
	122	buf[d] = c;
	123
	124	if (c != '%') {
	125	if (c == '\n') {
ab6ed3c4	126	buf[d] = 0;
51f3a685	127	printf_line(printf_xpos, buf);
ab6ed3c4	128	d = 0;
	129	printf_xpos = 0;
	130	continue;
	131	}
	132	d++;
	133	continue;
	134	}
51f3a685	135	if (d >= PRINTF_LEN)
	136	continue;
	137
	138	if (*fmt == '0') {
	139	prefix0 = 1;
	140	fmt++;
	141	}
	142
	143	while ('1' <= fmt && fmt <= '9') {
	144	fwidth = fwidth * 10 + *fmt - '0';
	145	fmt++;
	146	}
ab6ed3c4	147
	148	switch (*fmt++) {
	149	case '%':
	150	d++;
	151	break;
	152	case 'd':
	153	case 'i':
	154	ival = va_arg(ap, int);
	155	if (ival < 0) {
	156	buf[d++] = '-';
	157	ival = -ival;
	158	}
	159	for (i = 1000000000; i >= 10; i /= 10)
	160	if (ival >= i)
	161	break;
	162	for (; i >= 10; i /= 10) {
	163	buf[d++] = '0' + ival / i;
	164	ival %= i;
	165	}
	166	buf[d++] = '0' + ival;
	167	break;
51f3a685	168	case 'x':
	169	uval = va_arg(ap, int);
	170	while (fwidth > 0 && uval < (1 << (fwidth - 1) * 4)) {
	171	buf[d++] = prefix0 ? '0' : ' ';
	172	fwidth--;
	173	}
	174	for (j = 1; j < 8 && uval >= (1 << j * 4); j++)
	175	;
	176	for (j--; j >= 0; j--)
	177	buf[d++] = hexchars[(uval >> j * 4) & 0x0f];
	178	break;
ab6ed3c4	179	case 's':
51f3a685	180	s = va_arg(ap, char *);
	181	while (*s && d < PRINTF_LEN)
	182	buf[d++] = *s++;
	183	break;
ab6ed3c4	184	default:
	185	// don't handle, for now
	186	d++;
ab6ed3c4	187	va_arg(ap, void *);
	188	break;
	189	}
	190	}
	191	buf[d] = 0;
	192	va_end(ap);
	193
	194	if (d != 0) {
	195	// line without \n
	196	VDP_drawTextML(buf, APLANE, printf_xpos,
	197	printf_ypos & (PLANE_H - 1));
	198	printf_xpos += d;
	199	}
	200
	201	return d; // wrong..
	202	}
	203
	204	void exception(void)
	205	{
	206	VDP_drawTextML("============", APLANE, 0, 0);
	207	VDP_drawTextML(" exception! ", APLANE, 0, 1);
	208	VDP_drawTextML("============", APLANE, 0, 2);
	209	while (1)
	210	;
	211	}
	212
	213	void vbl(void)
	214	{
	215	}
	216
51f3a685	217	static int usb_read_while_ready(OsRoutine *ed,
	218	void *buf_, int maxlen)
	219	{
	220	u8 *buf = buf_;
	221	int r = 0;
	222
	223	while (ed->usbRdReady() && r < maxlen)
	224	buf[r++] = ed->usbReadByte();
	225
	226	return r;
	227	}
	228
	229	/*
	230	* TH = 1 : ?1CBRLDU 3-button pad return value (not read)
	231	* TH = 0 : ?0SA00DU 3-button pad return value
	232	* TH = 1 : ?1CBRLDU 3-button pad return value
	233	* TH = 0 : ?0SA0000 D3-0 are forced to '0'
	234	* TH = 1 : ?1CBMXYZ Extra buttons returned in D3-0
	235	* TH = 0 : ?0SA1111 D3-0 are forced to '1'
	236	*/
	237	static void test_joy_latency(int min_out, int max_out)
	238	{
	239	u8 rbuf[8 * 6];
	240	int min = 8;
	241	int max = 0;
	242	int i, v, b, e;
	243
	244	for (i = 0; i < 64; i++) {
	245	read_joy_responses(rbuf);
	246
	247	for (b = 0; b < 8 * 4; b++) {
	248	v = b & 7;
	249	e = (b & 0x08) ? 0x0c : 0;
	250	if ((rbuf[b] & 0x0c) == e) {
	251	if (v < min)
	252	min = v;
	253	}
	254	else if (v > max)
	255	max = v;
	256	}
	257	}
	258
	259	/* print out the last test */
	260	for (b = 0; b < 8 * 5; b++) {
	261	printf(" %02x", rbuf[b]);
	262	if ((b & 7) == 7)
	263	printf("\n");
	264	}
	265	printf("\n");
	266
	267	*min_out = min;
	268	*max_out = max;
	269	}
	270
	271	static int do_test(OsRoutine *ed, u8 b3)
	272	{
	273	int min = 0, max = 0;
	274
	275	switch (b3)
	276	{
	277	case 'j':
	278	test_joy_latency(&min, &max);
	279	printf("latency: %d - %d\n\n", min, max);
	280	return 0;
281	default:
282	break;
283	}
284
285	return -1;
286	}
287
ab6ed3c4	288	int main()
	289	{
	290	OsRoutine *ed;
51f3a685	291	u8 buf[16];
51f3a685	292	int i, d, ret;
ab6ed3c4	293
	294	ed = (OsRoutine ) (u32 *)0x1A0;
	295	ed->memInitDmaCode();
	296
	297	ed->VDP_setReg(VDP_MODE1, 0x04);
	298	ed->VDP_setReg(VDP_MODE2, 0x64);
	299	ed->VDP_setReg(VDP_AUTOINC, 2);
	300	ed->VDP_setReg(VDP_SCROLLSZ, 0x01);
	301
	302	/* clear name tables */
	303	write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(APLANE));
	304	for (i = 0; i < PLANE_W * PLANE_H / 2; i++)
	305	write32(GFX_DATA_PORT, 0);
	306
	307	write32(GFX_CTRL_PORT, GFX_WRITE_VRAM_ADDR(BPLANE));
	308	for (i = 0; i < PLANE_W * PLANE_H / 2; i++)
	309	write32(GFX_DATA_PORT, 0);
	310
	311	/* note: relying on ED menu's font setup here.. */
	312
ab6ed3c4	313	for (;;) {
51f3a685	314	if (!ed->usbRdReady()) {
ab6ed3c4	315	asm volatile("stop #0x2000");
51f3a685	316	continue;
	317	}
	318
	319	buf[0] = ed->usbReadByte();
	320	if (buf[0] == ' ')
	321	continue;
	322	if (buf[0] != '*') {
	323	d = 1;
	324	goto bad_input;
	325	}
	326
	327	/* note: OS uses Twofgsr */
	328	buf[1] = ed->usbReadByte();
	329	switch (buf[1]) {
	330	case 'T':
	331	ed->usbWriteByte('k');
	332	break;
	333	/* custom */
	334	case 't':
	335	buf[2] = ed->usbReadByte();
	336	ret = do_test(ed, buf[2]);
	337	if (ret != 0) {
	338	d = 3;
	339	goto bad_input;
	340	}
	341	ed->usbWriteByte('k');
	342	break;
	343	default:
	344	d = 2;
	345	goto bad_input;
	346	}
	347
	348	continue;
	349
	350	bad_input:
	351	ret = usb_read_while_ready(ed, buf + d, sizeof(buf) - d);
	352	buf[d + ret] = 0;
	353	printf("bad cmd: %s\n", buf);
	354	/* consume all remaining data */
	355	while (ed->usbRdReady())
	356	usb_read_while_ready(ed, buf, sizeof(buf));
ab6ed3c4	357
51f3a685	358	ed->usbWriteByte('b');
ab6ed3c4	359	}
	360
	361	return 0;
	362	}
	363
	364	// vim:ts=4:sw=4:expandtab