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
|
/*
LUFA Library
Copyright (C) Dean Camera, 2011.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of the author not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
*/
/** \file
*
* Target-related functions for the ISP Protocol decoder.
*/
#include "ISPTarget.h"
#if defined(ENABLE_ISP_PROTOCOL) || defined(__DOXYGEN__)
/** List of hardware SPI prescaler masks for possible AVRStudio ISP programming speeds.
*
* \hideinitializer
*/
static uint8_t SPIMaskFromSCKDuration[] PROGMEM =
{
#if (F_CPU == 8000000)
SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 4MHz SPI
SPI_SPEED_FCPU_DIV_2, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI
SPI_SPEED_FCPU_DIV_4, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI
SPI_SPEED_FCPU_DIV_8, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI
SPI_SPEED_FCPU_DIV_16, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
SPI_SPEED_FCPU_DIV_32, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
SPI_SPEED_FCPU_DIV_64, // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
#elif (F_CPU == 16000000)
SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 8MHz SPI
SPI_SPEED_FCPU_DIV_4, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI
SPI_SPEED_FCPU_DIV_8, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI
SPI_SPEED_FCPU_DIV_16, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI
SPI_SPEED_FCPU_DIV_32, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
SPI_SPEED_FCPU_DIV_64, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
SPI_SPEED_FCPU_DIV_128 // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
#else
#error No SPI prescaler masks for chosen F_CPU speed.
#endif
};
/** Lookup table to convert the slower ISP speeds into a compare value for the software SPI driver.
*
* \hideinitializer
*/
static uint16_t TimerCompareFromSCKDuration[] PROGMEM =
{
TIMER_COMP(96386), TIMER_COMP(89888), TIMER_COMP(84211), TIMER_COMP(79208), TIMER_COMP(74767),
TIMER_COMP(70797), TIMER_COMP(67227), TIMER_COMP(64000), TIMER_COMP(61069), TIMER_COMP(58395),
TIMER_COMP(55945), TIMER_COMP(51613), TIMER_COMP(49690), TIMER_COMP(47905), TIMER_COMP(46243),
TIMER_COMP(43244), TIMER_COMP(41885), TIMER_COMP(39409), TIMER_COMP(38278), TIMER_COMP(36200),
TIMER_COMP(34335), TIMER_COMP(32654), TIMER_COMP(31129), TIMER_COMP(29740), TIMER_COMP(28470),
TIMER_COMP(27304), TIMER_COMP(25724), TIMER_COMP(24768), TIMER_COMP(23461), TIMER_COMP(22285),
TIMER_COMP(21221), TIMER_COMP(20254), TIMER_COMP(19371), TIMER_COMP(18562), TIMER_COMP(17583),
TIMER_COMP(16914), TIMER_COMP(16097), TIMER_COMP(15356), TIMER_COMP(14520), TIMER_COMP(13914),
TIMER_COMP(13224), TIMER_COMP(12599), TIMER_COMP(12031), TIMER_COMP(11511), TIMER_COMP(10944),
TIMER_COMP(10431), TIMER_COMP(9963), TIMER_COMP(9468), TIMER_COMP(9081), TIMER_COMP(8612),
TIMER_COMP(8239), TIMER_COMP(7851), TIMER_COMP(7498), TIMER_COMP(7137), TIMER_COMP(6809),
TIMER_COMP(6478), TIMER_COMP(6178), TIMER_COMP(5879), TIMER_COMP(5607), TIMER_COMP(5359),
TIMER_COMP(5093), TIMER_COMP(4870), TIMER_COMP(4633), TIMER_COMP(4418), TIMER_COMP(4209),
TIMER_COMP(4019), TIMER_COMP(3823), TIMER_COMP(3645), TIMER_COMP(3474), TIMER_COMP(3310),
TIMER_COMP(3161), TIMER_COMP(3011), TIMER_COMP(2869), TIMER_COMP(2734), TIMER_COMP(2611),
TIMER_COMP(2484), TIMER_COMP(2369), TIMER_COMP(2257), TIMER_COMP(2152), TIMER_COMP(2052),
TIMER_COMP(1956), TIMER_COMP(1866), TIMER_COMP(1779), TIMER_COMP(1695), TIMER_COMP(1615),
TIMER_COMP(1539), TIMER_COMP(1468), TIMER_COMP(1398), TIMER_COMP(1333), TIMER_COMP(1271),
TIMER_COMP(1212), TIMER_COMP(1155), TIMER_COMP(1101), TIMER_COMP(1049), TIMER_COMP(1000),
TIMER_COMP(953), TIMER_COMP(909), TIMER_COMP(866), TIMER_COMP(826), TIMER_COMP(787),
TIMER_COMP(750), TIMER_COMP(715), TIMER_COMP(682), TIMER_COMP(650), TIMER_COMP(619),
TIMER_COMP(590), TIMER_COMP(563), TIMER_COMP(536), TIMER_COMP(511), TIMER_COMP(487),
TIMER_COMP(465), TIMER_COMP(443), TIMER_COMP(422), TIMER_COMP(402), TIMER_COMP(384),
TIMER_COMP(366), TIMER_COMP(349), TIMER_COMP(332), TIMER_COMP(317), TIMER_COMP(302),
TIMER_COMP(288), TIMER_COMP(274), TIMER_COMP(261), TIMER_COMP(249), TIMER_COMP(238),
TIMER_COMP(226), TIMER_COMP(216), TIMER_COMP(206), TIMER_COMP(196), TIMER_COMP(187),
TIMER_COMP(178), TIMER_COMP(170), TIMER_COMP(162), TIMER_COMP(154), TIMER_COMP(147),
TIMER_COMP(140), TIMER_COMP(134), TIMER_COMP(128), TIMER_COMP(122), TIMER_COMP(116),
TIMER_COMP(111), TIMER_COMP(105), TIMER_COMP(100), TIMER_COMP(95.4), TIMER_COMP(90.9),
TIMER_COMP(86.6), TIMER_COMP(82.6), TIMER_COMP(78.7), TIMER_COMP(75.0), TIMER_COMP(71.5),
TIMER_COMP(68.2), TIMER_COMP(65.0), TIMER_COMP(61.9), TIMER_COMP(59.0), TIMER_COMP(56.3),
TIMER_COMP(53.6), TIMER_COMP(51.1)
};
/** Currently selected SPI driver, either hardware (for fast ISP speeds) or software (for slower ISP speeds). */
bool HardwareSPIMode = true;
/** Software SPI data register for sending and receiving */
static volatile uint8_t SoftSPI_Data;
/** Number of bits left to transfer in the software SPI driver */
static volatile uint8_t SoftSPI_BitsRemaining;
/** ISR to handle software SPI transmission and reception */
ISR(TIMER1_COMPA_vect, ISR_BLOCK)
{
/* Check if rising edge (output next bit) or falling edge (read in next bit) */
if (!(PINB & (1 << 1)))
{
if (SoftSPI_Data & (1 << 7))
PORTB |= (1 << 2);
else
PORTB &= ~(1 << 2);
}
else
{
SoftSPI_Data <<= 1;
if (!(SoftSPI_BitsRemaining--))
TCCR1B = 0;
if (PINB & (1 << 3))
SoftSPI_Data |= (1 << 0);
}
/* Fast toggle of PORTB.1 via the PIN register (see datasheet) */
PINB |= (1 << 1);
}
/** Initializes the appropriate SPI driver (hardware or software, depending on the selected ISP speed) ready for
* communication with the attached target.
*/
void ISPTarget_EnableTargetISP(void)
{
uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION);
if (SCKDuration < sizeof(SPIMaskFromSCKDuration))
{
HardwareSPIMode = true;
SPI_Init(pgm_read_byte(&SPIMaskFromSCKDuration[SCKDuration]) | SPI_ORDER_MSB_FIRST |
SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
}
else
{
HardwareSPIMode = false;
DDRB |= ((1 << 1) | (1 << 2));
PORTB |= ((1 << 0) | (1 << 3));
ISPTarget_ConfigureSoftwareSPI(SCKDuration);
}
}
/** Shuts down the current selected SPI driver (hardware or software, depending on the selected ISP speed) so that no
* further communications can occur until the driver is re-initialized.
*/
void ISPTarget_DisableTargetISP(void)
{
if (HardwareSPIMode)
{
SPI_Disable();
}
else
{
DDRB &= ~((1 << 1) | (1 << 2));
PORTB &= ~((1 << 0) | (1 << 3));
/* Must re-enable rescue clock once software ISP has exited, as the timer for the rescue clock is
* re-purposed for software SPI */
ISPTarget_ConfigureRescueClock();
}
}
/** Configures the AVR to produce a 4MHz rescue clock out of the OCR1A pin of the AVR, so
* that it can be fed into the XTAL1 pin of an AVR whose fuses have been mis-configured for
* an external clock rather than a crystal. When used, the ISP speed must be 125KHz for this
* functionality to work correctly.
*/
void ISPTarget_ConfigureRescueClock(void)
{
#if defined(XCK_RESCUE_CLOCK_ENABLE)
/* Configure XCK as an output for the specified AVR model */
DDRD |= (1 << 5);
/* Start USART to generate a 4MHz clock on the XCK pin */
UBRR1 = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
UCSR1B = (1 << TXEN1);
UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
#else
/* Configure OCR1A as an output for the specified AVR model */
#if defined(USB_SERIES_2_AVR)
DDRC |= (1 << 6);
#else
DDRB |= (1 << 5);
#endif
/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
TIMSK1 = 0;
TCNT1 = 0;
OCR1A = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
TCCR1A = (1 << COM1A0);
TCCR1B = ((1 << WGM12) | (1 << CS10));
#endif
}
/** Configures the AVR's timer ready to produce software SPI for the slower ISP speeds that
* cannot be obtained when using the AVR's hardware SPI module.
*
* \param[in] SCKDuration Duration of the desired software ISP SCK clock
*/
void ISPTarget_ConfigureSoftwareSPI(const uint8_t SCKDuration)
{
/* Configure Timer 1 for software SPI using the specified SCK duration */
TIMSK1 = (1 << OCIE1A);
TCNT1 = 0;
OCR1A = pgm_read_word(&TimerCompareFromSCKDuration[SCKDuration - sizeof(SPIMaskFromSCKDuration)]);
TCCR1A = 0;
TCCR1B = 0;
}
/** Sends and receives a single byte of data to and from the attached target via software SPI.
*
* \param[in] Byte Byte of data to send to the attached target
*
* \return Received byte of data from the attached target
*/
uint8_t ISPTarget_TransferSoftSPIByte(const uint8_t Byte)
{
SoftSPI_Data = Byte;
SoftSPI_BitsRemaining = 8;
if (SoftSPI_Data & 0x01)
PORTB |= (1 << 2);
else
PORTB &= ~(1 << 2);
TCNT1 = 0;
TCCR1B = ((1 << WGM12) | (1 << CS11));
while (SoftSPI_BitsRemaining && !(TimeoutExpired));
TCCR1B = 0;
return SoftSPI_Data;
}
/** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command.
* When not asserted, the line is tristated so as not to interfere with normal device operation.
*
* \param[in] ResetTarget Boolean true when the target should be held in reset, false otherwise
*/
void ISPTarget_ChangeTargetResetLine(const bool ResetTarget)
{
if (ResetTarget)
{
AUX_LINE_DDR |= AUX_LINE_MASK;
if (!(V2Params_GetParameterValue(PARAM_RESET_POLARITY)))
AUX_LINE_PORT |= AUX_LINE_MASK;
else
AUX_LINE_PORT &= ~AUX_LINE_MASK;
}
else
{
AUX_LINE_DDR &= ~AUX_LINE_MASK;
AUX_LINE_PORT &= ~AUX_LINE_MASK;
}
}
/** Waits until the target has completed the last operation, by continuously polling the device's
* BUSY flag until it is cleared, or until the command timeout period has expired.
*
* \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT otherwise
*/
uint8_t ISPTarget_WaitWhileTargetBusy(void)
{
do
{
ISPTarget_SendByte(0xF0);
ISPTarget_SendByte(0x00);
ISPTarget_SendByte(0x00);
}
while ((ISPTarget_ReceiveByte() & 0x01) && !(TimeoutExpired));
return (TimeoutExpired) ? STATUS_RDY_BSY_TOUT : STATUS_CMD_OK;
}
/** Sends a low-level LOAD EXTENDED ADDRESS command to the target, for addressing of memory beyond the
* 64KB boundary. This sends the command with the correct address as indicated by the current address
* pointer variable set by the host when a SET ADDRESS command is issued.
*/
void ISPTarget_LoadExtendedAddress(void)
{
ISPTarget_SendByte(LOAD_EXTENDED_ADDRESS_CMD);
ISPTarget_SendByte(0x00);
ISPTarget_SendByte((CurrentAddress & 0x00FF0000) >> 16);
ISPTarget_SendByte(0x00);
}
/** Waits until the last issued target memory programming command has completed, via the check mode given and using
* the given parameters.
*
* \param[in] ProgrammingMode Programming mode used and completion check to use, a mask of PROG_MODE_* constants
* \param[in] PollAddress Memory address to poll for completion if polling check mode used
* \param[in] PollValue Poll value to check against if polling check mode used
* \param[in] DelayMS Milliseconds to delay before returning if delay check mode used
* \param[in] ReadMemCommand Device low-level READ MEMORY command to send if value check mode used
*
* \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT or
* \ref STATUS_CMD_TOUT otherwise
*/
uint8_t ISPTarget_WaitForProgComplete(const uint8_t ProgrammingMode,
const uint16_t PollAddress,
const uint8_t PollValue,
const uint8_t DelayMS,
const uint8_t ReadMemCommand)
{
uint8_t ProgrammingStatus = STATUS_CMD_OK;
/* Determine method of Programming Complete check */
switch (ProgrammingMode & ~(PROG_MODE_PAGED_WRITES_MASK | PROG_MODE_COMMIT_PAGE_MASK))
{
case PROG_MODE_WORD_TIMEDELAY_MASK:
case PROG_MODE_PAGED_TIMEDELAY_MASK:
ISPProtocol_DelayMS(DelayMS);
break;
case PROG_MODE_WORD_VALUE_MASK:
case PROG_MODE_PAGED_VALUE_MASK:
do
{
ISPTarget_SendByte(ReadMemCommand);
ISPTarget_SendByte(PollAddress >> 8);
ISPTarget_SendByte(PollAddress & 0xFF);
}
while ((ISPTarget_TransferByte(0x00) == PollValue) && !(TimeoutExpired));
if (TimeoutExpired)
ProgrammingStatus = STATUS_CMD_TOUT;
break;
case PROG_MODE_WORD_READYBUSY_MASK:
case PROG_MODE_PAGED_READYBUSY_MASK:
ProgrammingStatus = ISPTarget_WaitWhileTargetBusy();
break;
}
return ProgrammingStatus;
}
#endif
|
