gauge / prom.c

Trammell Hudson ec8a123 
Trammell Hudson 530dab7 


Trammell Hudson ec8a123 








Trammell Hudson 530dab7 
Trammell Hudson ec8a123 



































Trammell Hudson 18a35e3 
Trammell Hudson 525a46b 












































Trammell Hudson 18a35e3 

Trammell Hudson 2d2c7c9 
Trammell Hudson 18a35e3 








Trammell Hudson a748a07 


















Trammell Hudson 2d2c7c9 
Trammell Hudson 18a35e3 
Trammell Hudson 79767ad 
Trammell Hudson 18a35e3 











Trammell Hudson a748a07 

Trammell Hudson 2d2c7c9 
Trammell Hudson 18a35e3 











Trammell Hudson a748a07 

Adam Mayer c861a8d 














Trammell Hudson a748a07 
Trammell Hudson 245f2b3 










Trammell Hudson d0180ee 




Trammell Hudson 245f2b3 
Trammell Hudson a748a07 





Trammell Hudson 245f2b3 












Trammell Hudson a748a07 
Trammell Hudson 245f2b3 

Trammell Hudson 18a35e3 
Trammell Hudson a748a07 
Trammell Hudson ec8a123 

Trammell Hudson 1192504 
Trammell Hudson 525a46b 
Trammell Hudson 1192504 
Trammell Hudson 525a46b 


Trammell Hudson 2d2c7c9 
Trammell Hudson 525a46b 

Trammell Hudson 2d2c7c9 
Trammell Hudson 525a46b 

Trammell Hudson ec8a123 
Trammell Hudson 1192504 
Trammell Hudson 525a46b 
Trammell Hudson 1192504 

Trammell Hudson ec8a123 

Trammell Hudson 2d2c7c9 
Trammell Hudson 525a46b 
Trammell Hudson 1192504 
Trammell Hudson 525a46b 

Trammell Hudson ec8a123 


Trammell Hudson 245f2b3 













Trammell Hudson 1192504 


Trammell Hudson ec8a123 
Trammell Hudson 1192504 

Trammell Hudson ec8a123 

Trammell Hudson 1192504 
Trammell Hudson ec8a123 


Trammell Hudson 245f2b3 


Trammell Hudson ec8a123 

Trammell Hudson 245f2b3 




Trammell Hudson 525a46b 
Trammell Hudson 245f2b3 



Trammell Hudson 525a46b 
Trammell Hudson ec8a123 
Trammell Hudson 245f2b3 
Trammell Hudson ec8a123 


Trammell Hudson 1192504 


















































Trammell Hudson 2d2c7c9 














Trammell Hudson a748a07 
















































































































































































Trammell Hudson 2d2c7c9 














Trammell Hudson a748a07 
Trammell Hudson d0180ee 
Trammell Hudson 2d2c7c9 






























Trammell Hudson a748a07 
Trammell Hudson 2d2c7c9 
























Trammell Hudson a748a07 
Trammell Hudson 2d2c7c9 




Trammell Hudson 245f2b3 
Trammell Hudson d0180ee 
Trammell Hudson 245f2b3 
Trammell Hudson 1192504 


Trammell Hudson 2d2c7c9 
Trammell Hudson d0180ee 
Trammell Hudson 2d2c7c9 



Trammell Hudson 1192504 
Trammell Hudson 2d2c7c9 




Trammell Hudson d0180ee 
Trammell Hudson 2d2c7c9 


Trammell Hudson d0180ee 

Trammell Hudson 2d2c7c9 



Trammell Hudson d0180ee 
Trammell Hudson 2d2c7c9 



Trammell Hudson d0180ee 
Trammell Hudson 2d2c7c9 







Trammell Hudson 1192504 
Trammell Hudson ec8a123 

Trammell Hudson 525a46b 

Trammell Hudson ec8a123 

Trammell Hudson d0180ee 


Trammell Hudson ec8a123 



















Trammell Hudson 2d2c7c9 
Trammell Hudson ec8a123 



Trammell Hudson 2d2c7c9 
Trammell Hudson 18a35e3 
Trammell Hudson ec8a123 




































Trammell Hudson a748a07 


Trammell Hudson 2d2c7c9 
Trammell Hudson a748a07 

















Trammell Hudson ec8a123 















  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
/**
 * \file PROM dancer
 *
 * Read up to 40 pin DIP PROMs using a Teensy++ 2.0
 */

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <string.h>
#include <util/delay.h>
#include "usb_serial.h"
#include "bits.h"

void send_str(const char *s);
uint8_t recv_str(char *buf, uint8_t size);
void parse_and_execute_command(const char *buf, uint8_t num);

static uint8_t
hexdigit(
	uint8_t x
)
{
	x &= 0xF;
	if (x < 0xA)
		return x + '0' - 0x0;
	else
		return x + 'A' - 0xA;
}


static uint8_t
printable(
	uint8_t x
)
{
	if ('A' <= x && x <= 'Z')
		return 1;
	if ('a' <= x && x <= 'z')
		return 1;
	if ('0' <= x && x <= '9')
		return 1;
	if (x == ' ')
		return 1;

	return 0;
}
	

/** Mapping of AVR IO ports to the ZIF socket pins */
static const uint8_t ports[] = {
	[ 1]	= 0xB6,
	[ 2]	= 0xB5,
	[ 3]	= 0xB4,
	[ 4]	= 0xB3,
	[ 5]	= 0xB2,
	[ 6]	= 0xB1,
	[ 7]	= 0xB0,
	[ 8]	= 0xE7,
	[ 9]	= 0xE6,
	[10]	= 0xA2,
	[11]	= 0xA1,
	[12]	= 0xF0,
	[13]	= 0xF1,
	[14]	= 0xF2,
	[15]	= 0xF3,
	[16]	= 0xF4,
	[17]	= 0xF5,
	[18]	= 0xF6,
	[19]	= 0xF7,
	[20]	= 0xA3,

	[21]	= 0xA7,
	[22]	= 0xC7,
	[23]	= 0xC6,
	[24]	= 0xC5,
	[25]	= 0xC4,
	[26]	= 0xC3,
	[27]	= 0xC2,
	[28]	= 0xC1,
	[29]	= 0xC0,
	[30]	= 0xE1,
	[31]	= 0xE0,
	[32]	= 0xD7,
	[33]	= 0xD6,
	[34]	= 0xD5,
	[35]	= 0xD4,
	[36]	= 0xD3,
	[37]	= 0xD2,
	[38]	= 0xD1,
	[39]	= 0xD0,
	[40]	= 0xB7,
};


typedef struct
{
	char name[16];
	uint8_t pins;
	uint8_t addr_width;
	uint8_t data_width;
	uint8_t addr_pins[24];
	uint8_t data_pins[24];
	uint8_t hi_pins[8];
	uint8_t lo_pins[8];
} prom_t;


static const prom_t proms[] = {
{
	// Default is to leave everything in tristate mode
	.name		= "NONE",
	.pins		= 28,

	.addr_width	= 0,
	.addr_pins	= {
	},

	.data_width	= 0,
	.data_pins	= {
	},

	.hi_pins	= { },
	.lo_pins	= { },
},
{
	.name		= "M27C512",
	.pins		= 28,

	.addr_width	= 16,
	.addr_pins	= {
		10, 9, 8, 7, 6, 5, 4, 3, 25, 24, 21, 23, 2, 26, 27, 1,
	},

	.data_width	= 8,
	.data_pins	= {
		11, 12, 13, 15, 16, 17, 18, 19,
	},

	.hi_pins	= { 28, },
	.lo_pins	= { 22, 20, 14, },
},
{
	.name		= "M27C256",
	.pins		= 28,
	.addr_width	= 15,
	.addr_pins	= {
		10, 9, 8, 7, 6, 5, 4, 3, 25, 24, 21, 23, 2, 26, 27,
	},

	.data_width	= 8,
	.data_pins	= {
		11, 12, 13, 15, 16, 17, 18, 19,
	},
	.hi_pins	= { 28, 1 },
	.lo_pins	= { 22, 20, 14, },
},
{
	.name		= "M27C64",
	.pins		= 28,
	.addr_width	= 13,
	.addr_pins	= {
		10, 9, 8, 7, 6, 5, 4, 3, 25, 24, 21, 23, 2,
	},

	.data_width	= 8,
	.data_pins	= {
		11, 12, 13, 15, 16, 17, 18, 19,
	},
	.hi_pins	= { 28, 1, 27 },
	.lo_pins	= { 22, 20, 14, },
},
{
	/** 8192x8 UV EEPROM, found in DX synth */
	.name		= "MBM2764-30",
	.pins		= 28,
	.addr_width	= 13,
	.addr_pins	= {
		10, 9, 8, 7, 6, 5, 4, 3, 25, 24, 21, 23, 2,
	},

	.data_width	= 8,
	.data_pins	= {
		11, 12, 13, 15, 16, 17, 18, 19,
	},
	.hi_pins	= {
		28, // vdd, disable if external power is used
		27, // pgm
		1,  // vpp
	},
	.lo_pins	= { 22, 20, 14, }, // !oe, !cs, gnd
},
{
	/** Apple Mac SE PROM chips
	 * Similar to a M27C512, but with the 17th address line
	 * on 22 instead of Vpp, allowing 128 KB of data.
	 */
	.name		= "APPLE PROM",
	.pins		= 28,
	.addr_width	= 17,
	.addr_pins	= {
		10, 9, 8, 7, 6, 5, 4, 3, 25, 24, 21, 23, 2, 26, 27, 1, 22
	},

	.data_width	= 8,
	.data_pins	= {
		11, 12, 13, 15, 16, 17, 18, 19,
	},
	.hi_pins	= { 28, },
	.lo_pins	= { 20, 14, },
},
};

/** Select one of the chips */
static const prom_t * prom = &proms[0];


/** Translate PROM pin numbers into ZIF pin numbers */
static inline uint8_t
prom_pin(
	const uint8_t pin
)
{
	if (pin <= prom->pins / 2)
		return ports[pin];
	else
		return ports[pin + 40 - prom->pins];
}
		

/** Select a 32-bit address for the current PROM */
static void
prom_set_address(
	uint32_t addr
)
{
	for (uint8_t i = 0 ; i < prom->addr_width ; i++)
	{
		out(prom_pin(prom->addr_pins[i]), addr & 1);
		addr >>= 1;
	}
}


static uint8_t
_prom_read(void)
{
	uint8_t b = 0;
	for (uint8_t i = 0 ; i < prom->data_width  ; i++)
	{
		uint8_t bit = in(prom_pin(prom->data_pins[i])) ? 0x80 : 0;
		b = (b >> 1) | bit;
	}

	return b;
}


/** Read a byte from the PROM at the specified address..
 * \todo Update this to handle wider than 8-bit PROM chips.
 */
static uint8_t
prom_read(
	uint32_t addr
)
{
	prom_set_address(addr);
	for(uint8_t i = 0 ; i < 255; i++)
	{
		asm("nop");
		asm("nop");
		asm("nop");
		asm("nop");
	}

	uint8_t old_r = _prom_read();

	// Try reading a few times to be sure,
	// or until the values converge
	for (uint8_t i = 0 ; i < 8 ; i++)
	{
		uint8_t r = _prom_read();
		if (r == old_r)
			break;
		old_r = r;
	}

	return old_r;
}


/** Configure all of the IO pins for the new PROM type */
static void
prom_setup(void)
{
	// Configure all of the address pins as outputs
	for (uint8_t i = 0 ; i < prom->addr_width ; i++)
		ddr(prom_pin(prom->addr_pins[i]), 1);

	// Configure all of the data pins as inputs
	for (uint8_t i = 0 ; i < prom->data_width ; i++)
		ddr(prom_pin(prom->data_pins[i]), 0);

	// Configure all of the hi and low pins as outputs
	for (uint8_t i = 0 ; i < array_count(prom->hi_pins) ; i++)
	{
		uint8_t pin = prom_pin(prom->hi_pins[i]);
		if (pin == 0)
			continue;
		out(pin, 1);
		ddr(pin, 1);
	}

	for (uint8_t i = 0 ; i < array_count(prom->lo_pins) ; i++)
	{
		uint8_t pin = prom_pin(prom->lo_pins[i]);
		if (pin == 0)
			continue;
		out(pin, 0);
		ddr(pin, 1);
	}

	// Let things stabilize for a little while
	_delay_ms(250);
}


/** Switch all of the ZIF pins back to tri-state to make it safe.
 * Doesn't matter what PROM is inserted.
 */
static void
prom_tristate(void)
{
	for (uint8_t i = 1 ; i <= 40 ; i++)
	{
		ddr(ports[i], 0);
		out(ports[i], 0);
	}
}



static uint8_t
usb_serial_getchar_block(void)
{
	while (1)
	{
		while (usb_serial_available() == 0)
			continue;

		uint16_t c = usb_serial_getchar();
		if (c != -1)
			return c;
	}
}


static uint8_t
usb_serial_getchar_echo(void)
{
	while (1)
	{
		while (usb_serial_available() == 0)
			continue;

		uint16_t c = usb_serial_getchar();
		if (c == -1)
			continue;
		usb_serial_putchar(c);
		return c;
	}
}

static uint8_t
hexdigit_parse(
	uint8_t c
)
{
	if ('0' <= c && c <= '9')
		return c - '0';
	if ('A' <= c && c <= 'F')
		return c - 'A' + 0xA;
	if ('a' <= c && c <= 'f')
		return c - 'a' + 0xA;
	return 0xFF;
}

static void
hex32(
	uint8_t * buf,
	uint32_t addr
)
{
	buf[7] = hexdigit(addr & 0xF); addr >>= 4;
	buf[6] = hexdigit(addr & 0xF); addr >>= 4;
	buf[5] = hexdigit(addr & 0xF); addr >>= 4;
	buf[4] = hexdigit(addr & 0xF); addr >>= 4;
	buf[3] = hexdigit(addr & 0xF); addr >>= 4;
	buf[2] = hexdigit(addr & 0xF); addr >>= 4;
	buf[1] = hexdigit(addr & 0xF); addr >>= 4;
	buf[0] = hexdigit(addr & 0xF); addr >>= 4;
}


static void
hexdump(
	uint32_t addr
)
{
	uint8_t buf[80];
	hex32(buf, addr);

	for (int i = 0 ; i < 16 ; i++)
	{
		uint8_t w = prom_read(addr++);
		uint8_t x = 8 + i * 3;
		buf[x+0] = ' ';
		buf[x+1] = hexdigit(w >> 4);
		buf[x+2] = hexdigit(w >> 0);

		buf[8 + 16*3 + i + 2] = printable(w) ? w : '.';
	}

	buf[8 + 16 * 3] = ' ';
	buf[8 + 16 * 3 + 18] = '\r';
	buf[8 + 16 * 3 + 19] = '\n';

	usb_serial_write(buf, 8 + 16 * 3 + 20);
}


/** Read an address from the serial port, then read that from the PROM */
static void
read_addr(void)
{
	uint32_t addr = 0;
	while (1)
	{
		uint8_t c = usb_serial_getchar_echo();
		if (c == '\r')
			break;
		if (c == '\n')
			continue;
		uint8_t n = hexdigit_parse(c);
		if (n == 0xFF)
			goto error;

		addr = (addr << 4) | n;
	}

	send_str(PSTR("\r\n"));

	prom_setup();
	_delay_ms(100);

	for (uint8_t line = 0 ; line < 4 ; line++)
	{
		hexdump(addr);
		addr += 16;
	}
	return;

error:
	send_str(PSTR("?\r\n"));
}


/** Send a single prom name to the serial port */
static void
prom_list_send(
	int mode,
	const prom_t * const prom,
	int selected
)
{
	uint8_t buf[32];

	uint8_t off = 0;
	if (selected)
	{
		buf[off++] = '*';
		buf[off++] = '*';
		buf[off++] = '*';
		buf[off++] = ' ';
	}

	buf[off++] = hexdigit(mode);
	buf[off++] = ' ';
	memcpy(buf+off, prom->name, sizeof(prom->name));
	off += sizeof(prom->name);
	buf[off++] = '\r';
	buf[off++] = '\n';

	usb_serial_write(buf, off);
}


/** List all of the PROM models supported */
static void
prom_list(void)
{
	send_str(PSTR("\r\n"));
	for (int i = 0 ; i < array_count(proms) ; i++)
	{
		const prom_t * const p = &proms[i];
		prom_list_send(i, p, p == prom );
	}
}


static void
prom_mode(void)
{
	uint8_t c = usb_serial_getchar_echo();
	send_str(PSTR("\r\n"));
	if (c < '0' || '9' < c)
	{
		send_str(PSTR("?\r\n"));
		return;
	}

	uint8_t mode = c - '0';
	if (mode >= array_count(proms))
	{
		send_str(PSTR("?\r\n"));
		return;
	}

	prom = &proms[mode];

	prom_list_send(mode, prom, 1);
}


typedef struct
{
	uint8_t soh;
	uint8_t block_num;
	uint8_t block_num_complement;
	uint8_t data[128];
	uint8_t cksum;
} __attribute__((__packed__))
xmodem_block_t;

#define XMODEM_SOH 0x01
#define XMODEM_EOT 0x04
#define XMODEM_ACK 0x06
#define XMODEM_CAN 0x18
#define XMODEM_C 0x43
#define XMODEM_NAK 0x15
#define XMODEM_EOF 0x1a


/** Send a block.
 * Compute the checksum and complement.
 *
 * \return 0 if all is ok, -1 if a cancel is requested or more
 * than 10 retries occur.
 */
static int
xmodem_send_block(
	xmodem_block_t * const block
)
{
	// Compute the checksum and complement
	uint8_t cksum = 0;
	for (uint8_t i = 0 ; i < sizeof(block->data) ; i++)
		cksum += block->data[i];
	block->cksum = cksum;
	block->block_num_complement = 0xFF - block->block_num;

	// Send the block, and wait for an ACK
	uint8_t retry_count = 0;
	goto send_block;

	while (retry_count++ < 10)
	{
		uint8_t c = usb_serial_getchar_block();
		if (c == XMODEM_ACK)
			return 0;
		if (c == XMODEM_CAN)
			return -1;
		if (c != XMODEM_NAK)
			continue;

		send_block:
		usb_serial_write((void*) block, sizeof(*block));
	}

	// Failure or cancel
	return -1;
}


/** Send the entire PROM memory */
static void
xmodem_send(void)
{
	uint8_t c;
	static xmodem_block_t block;

	block.soh = 0x01;
	block.block_num = 0x00;

	// wait for initial nak
	while (1)
	{
		c = usb_serial_getchar_block();
		if (c == XMODEM_NAK)
			break;
		if (c == XMODEM_CAN)
			return;
	}

	// Ending address
	const uint32_t end_addr = (((uint32_t) 1) << prom->addr_width) - 1;

	// Bring the pins up to level
	prom_setup();

	// Start sending!
	uint32_t addr = 0;
	while (1)
	{
		block.block_num++;
		for (uint8_t off = 0 ; off < sizeof(block.data) ; off++)
			block.data[off] = prom_read(addr++);

		if (xmodem_send_block(&block) < 0)
			return;

		// If we have wrapped the address, we are done
		if (addr >= end_addr)
			break;
	}

#if 0
/* Don't send EOF?  rx adds it to the file? */
	block.block_num++;
	memset(block.data, XMODEM_EOF, sizeof(block.data));
	if (xmodem_send_block(&block) < 0)
		return;
#endif

	// File transmission complete.  send an EOT
	while (1)
	{
		usb_serial_putchar(XMODEM_EOT);
		c = usb_serial_getchar_block();
		if (c == XMODEM_ACK
		||  c == XMODEM_CAN)
			break;
	}
}



int main(void)
{
	// set for 16 MHz clock
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
	CPU_PRESCALE(0);

	// Disable the ADC
	ADMUX = 0;

	// initialize the USB, and then wait for the host
	// to set configuration.  If the Teensy is powered
	// without a PC connected to the USB port, this 
	// will wait forever.
	usb_init();
	while (!usb_configured()) /* wait */ ;
	_delay_ms(1000);

	// wait for the user to run their terminal emulator program
	// which sets DTR to indicate it is ready to receive.
	while (!(usb_serial_get_control() & USB_SERIAL_DTR))
		continue;


	// discard anything that was received prior.  Sometimes the
	// operating system or other software will send a modem
	// "AT command", which can still be buffered.
	usb_serial_flush_input();


#if 0
	uint16_t addr = 0;
	char line[64];
	uint8_t off = 0;

	send_str(PSTR("Looking for strings\r\n"));

	while (1)
	{
		addr++;
		if (addr == 0)
			send_str(PSTR("wrap\r\n"));

		uint8_t byte = read_byte(addr);
		if (byte == 0)
			continue;

		if (off == 0)
		{
			line[off++] = hexdigit(addr >> 12);
			line[off++] = hexdigit(addr >>  8);
			line[off++] = hexdigit(addr >>  4);
			line[off++] = hexdigit(addr >>  0);
			line[off++] = '=';
		}

		if (printable(byte))
		{
			line[off++] = byte;
			if (off < sizeof(line) - 2)
				continue;
		} else {
			line[off++] = hexdigit(byte >> 4);
			line[off++] = hexdigit(byte >> 0);
		}

		line[off++] = '\r';
		line[off++] = '\n';
		usb_serial_write(line, off);
		off = 0;
	}
#else
	while (1)
	{
		// always put the PROM into tristate so that it is safe
		// to swap the chips in between readings, and 
		prom_tristate();

		send_str(PSTR("> "));
		char c = usb_serial_getchar_echo();
		switch (c)
		{
		case XMODEM_NAK: xmodem_send(); break;
		case 'r': read_addr(); break;
		case 'l': prom_list(); break;
		case 'm': prom_mode(); break;
		case '\n': break;
		case '\r': break;
		default:
			send_str(PSTR("\r\n"
"r000000 Read a hex word from address\r\n"
"l       List chip modes\r\n"
"mN      Select chip N\r\n"
			));
			break;
		}
	}
#endif
}


// Send a string to the USB serial port.  The string must be in
// flash memory, using PSTR
//
void send_str(const char *s)
{
	char c;
	while (1) {
		c = pgm_read_byte(s++);
		if (!c) break;
		usb_serial_putchar(c);
	}
}
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.