Mercurial > pihelp
annotate main.c @ 39:1745d94761ea
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 27 Jun 2013 19:25:32 +0800 |
| parents | c6f77df67dde |
| children | 9e888708f33d |
| rev | line source |
|---|---|
| 0 | 1 #include <stdio.h> |
| 2 #include <string.h> | |
| 3 #include <stddef.h> | |
| 4 #include <stdbool.h> | |
| 5 #include <stdlib.h> | |
| 6 #include <avr/io.h> | |
| 7 #include <avr/interrupt.h> | |
| 8 #include <avr/sleep.h> | |
| 9 #include <util/delay.h> | |
| 10 #include <avr/pgmspace.h> | |
| 11 #include <avr/eeprom.h> | |
| 12 #include <avr/wdt.h> | |
| 13 #include <util/atomic.h> | |
| 14 #include <util/crc16.h> | |
| 15 | |
| 2 | 16 #include "hmac-sha1.h" |
| 5 | 17 #include "aes.h" |
| 2 | 18 |
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19 #include "fat.h" |
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20 #include "fat_config.h" |
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21 #include "partition.h" |
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22 #include "sd_raw.h" |
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23 #include "sd_raw_config.h" |
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24 |
| 1 | 25 //#include "simple_ds18b20.h" |
| 26 //#include "onewire.h" | |
| 0 | 27 |
| 20 | 28 // not set via bootloader |
| 29 //LOCKBITS = (LB_MODE_3 & BLB0_MODE_4 & BLB1_MODE_4); | |
| 5 | 30 |
| 0 | 31 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y)) |
| 32 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y)) | |
| 33 | |
| 34 // TICK should be 8 or less (8 untested). all timers need | |
| 35 // to be a multiple. | |
| 36 | |
| 1 | 37 #define TICK 1 |
| 17 | 38 #define SLEEP_COMPARE (F_CPU/256) // == 19200 for 4915200mhz |
| 5 | 39 #define NKEYS 10 |
| 40 #define HMACLEN 20 | |
| 41 #define AESLEN 16 | |
| 42 #define KEYLEN HMACLEN | |
| 1 | 43 |
| 27 | 44 #define BAUD 115200 |
| 20 | 45 #define UBRR ((F_CPU)/(16*(BAUD))-1) |
| 0 | 46 |
| 2 | 47 #define PORT_PI_BOOT PORTD |
| 48 #define DDR_PI_BOOT DDRD | |
| 4 | 49 #define PIN_PI_BOOT PD5 |
| 2 | 50 |
| 51 #define PORT_PI_RESET PORTD | |
| 52 #define DDR_PI_RESET DDRD | |
| 53 #define PIN_PI_RESET PD6 | |
| 54 | |
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55 #define PORT_PI_WARNING PORTD |
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56 #define DDR_PI_WARNING DDRD |
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57 #define PIN_PI_WARNING PD7 |
| 0 | 58 |
| 59 // #define HAVE_UART_ECHO | |
| 60 | |
| 7 | 61 // stores a value of clock_epoch combined with the remainder of TCNT1, |
| 0 | 62 // for 1/32 second accuracy |
| 63 struct epoch_ticks | |
| 64 { | |
| 65 uint32_t ticks; | |
| 66 // remainder | |
| 20 | 67 uint16_t rem; |
| 0 | 68 }; |
| 69 | |
| 16 | 70 #define WATCHDOG_LONG_MIN (60L*40) // 40 mins |
| 71 #define WATCHDOG_LONG_MAX (60L*60*72) // 72 hours | |
| 72 #define WATCHDOG_LONG_DEFAULT (60L*60*6) // 6 hours | |
| 73 | |
| 74 #define WATCHDOG_SHORT_MIN (60L*15) // 15 mins | |
| 75 | |
| 76 #define NEWBOOT_DEFAULT (60*10) // 10 minutes | |
| 77 #define NEWBOOT_MIN (60*2) // 2 minutes | |
| 78 #define NEWBOOT_MAX (60*30) // 30 mins | |
| 79 | |
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80 #define WARNING_TIME 10 |
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81 |
| 1 | 82 // eeprom-settable parameters, default values defined here. |
| 83 // all timeouts should be a multiple of TICK | |
| 16 | 84 static uint32_t watchdog_long_limit = WATCHDOG_LONG_DEFAULT; |
| 1 | 85 static uint32_t watchdog_short_limit = 0; |
| 16 | 86 static uint32_t newboot_limit = NEWBOOT_DEFAULT; |
| 0 | 87 |
| 1 | 88 // avr proves itself |
| 2 | 89 static uint8_t avr_keys[NKEYS][KEYLEN] = {{0}}; |
| 0 | 90 |
| 91 // ---- Atomic guards required accessing these variables | |
| 92 // clock_epoch in seconds | |
| 93 static uint32_t clock_epoch; | |
| 1 | 94 // watchdog counts up |
| 95 static uint32_t watchdog_long_count; | |
| 96 static uint32_t watchdog_short_count; | |
| 2 | 97 // newboot counts down |
| 1 | 98 static uint32_t newboot_count; |
| 2 | 99 // oneshot counts down |
| 100 static uint32_t oneshot_count; | |
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101 // countdown after the warning. |
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102 static uint8_t reboot_count; |
| 27 | 103 // set by adc completion interrupt |
| 104 static uint8_t adc_done; | |
| 2 | 105 |
| 0 | 106 // ---- End atomic guards required |
| 107 | |
| 108 // boolean flags | |
| 1 | 109 static uint8_t watchdog_long_hit; |
| 110 static uint8_t watchdog_short_hit; | |
| 111 static uint8_t newboot_hit; | |
| 2 | 112 static uint8_t oneshot_hit; |
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113 static uint8_t reboot_hit; |
| 0 | 114 |
| 22 | 115 // informational for status messages |
| 116 static uint8_t boot_normal_status; | |
| 117 | |
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118 // flips between 0 and 1 each watchdog_long_hit, so eventually a |
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119 // working firmware should boot. set back to 0 for each 'alive' |
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120 // command |
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121 static uint8_t long_reboot_mode = 0; |
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122 |
| 0 | 123 static uint8_t readpos; |
| 20 | 124 static char readbuf[150]; |
| 0 | 125 static uint8_t have_cmd; |
| 126 | |
| 127 int uart_putchar(char c, FILE *stream); | |
| 22 | 128 static void long_delay(uint16_t ms); |
| 0 | 129 static void blink(); |
| 130 static uint16_t adc_vcc(); | |
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131 static uint16_t adc_5v(uint16_t vcc); |
| 20 | 132 static uint16_t adc_temp(); |
| 2 | 133 static void set_pi_boot_normal(uint8_t normal); |
| 0 | 134 |
| 17 | 135 |
| 0 | 136 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
| 137 _FDEV_SETUP_WRITE); | |
| 138 | |
| 139 // thanks to http://projectgus.com/2010/07/eeprom-access-with-arduino/ | |
| 140 #define eeprom_read_to(dst_p, eeprom_field, dst_size) eeprom_read_block((dst_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (dst_size)) | |
| 141 #define eeprom_read(dst, eeprom_field) eeprom_read_to((&dst), eeprom_field, sizeof(dst)) | |
| 142 #define eeprom_write_from(src_p, eeprom_field, src_size) eeprom_write_block((src_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (src_size)) | |
| 143 #define eeprom_write(src, eeprom_field) { eeprom_write_from(&src, eeprom_field, sizeof(src)); } | |
| 144 | |
| 1 | 145 #define EXPECT_MAGIC 0xdf83 |
| 0 | 146 |
| 147 struct __attribute__ ((__packed__)) __eeprom_data { | |
| 1 | 148 uint32_t watchdog_long_limit; |
| 149 uint32_t watchdog_short_limit; | |
| 150 uint32_t newboot_limit; | |
| 0 | 151 |
| 2 | 152 uint8_t avr_keys[NKEYS][KEYLEN]; |
| 0 | 153 |
| 154 uint16_t magic; | |
| 155 }; | |
| 156 | |
| 157 // Very first setup | |
| 158 static void | |
| 159 setup_chip() | |
| 160 { | |
| 161 cli(); | |
| 162 | |
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163 // set to 8 seconds, in case sha1 is slow etc. |
| 1 | 164 wdt_enable(WDTO_8S); |
| 165 | |
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166 // Set scaler to /1, -> clock to 8mhz |
| 0 | 167 CLKPR = _BV(CLKPCE); |
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168 CLKPR = 0; |
| 0 | 169 |
| 170 // enable pullups | |
| 1 | 171 // XXX matt pihelp |
| 5 | 172 //PORTB = 0xff; // XXX change when using SPI |
| 173 //PORTD = 0xff; | |
| 174 //PORTC = 0xff; | |
| 0 | 175 |
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176 DDR_PI_WARNING |= _BV(PIN_PI_WARNING); |
| 0 | 177 |
| 5 | 178 #if 0 |
| 0 | 179 // set pullup |
| 180 PORTD |= _BV(PD2); | |
| 181 // INT0 setup | |
| 182 EICRA = (1<<ISC01); // falling edge - data sheet says it won't work? | |
| 183 EIMSK = _BV(INT0); | |
| 5 | 184 #endif |
| 0 | 185 |
| 186 // comparator disable | |
| 187 ACSR = _BV(ACD); | |
| 188 | |
| 189 // disable adc pin input buffers | |
| 190 DIDR0 = 0x3F; // acd0-adc5 | |
| 191 DIDR1 = (1<<AIN1D)|(1<<AIN0D); // ain0/ain1 | |
| 192 | |
| 193 sei(); | |
| 194 } | |
| 195 | |
| 196 static void | |
| 197 get_epoch_ticks(struct epoch_ticks *t) | |
| 198 { | |
| 199 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 200 { | |
| 201 t->ticks = clock_epoch; | |
| 7 | 202 t->rem = TCNT1; |
| 0 | 203 } |
| 204 } | |
| 205 | |
| 206 static void | |
| 207 setup_tick_counter() | |
| 208 { | |
| 2 | 209 // set up counter1 |
| 210 | |
| 0 | 211 // set up counter2. |
| 212 // COM21 COM20 Set OC2 on Compare Match (p116) | |
| 213 // WGM21 Clear counter on compare | |
| 214 //TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); | |
| 215 // toggle on match | |
| 2 | 216 TCCR1A = _BV(COM1A0); |
| 8 | 217 #ifdef SIM_DEBUG |
| 218 // systemclock/8 | |
| 219 TCCR1B = _BV(CS11); | |
| 220 #else | |
| 20 | 221 // systemclock/256 |
| 222 TCCR1B = _BV(CS12); | |
| 8 | 223 #endif |
| 2 | 224 TCNT1 = 0; |
| 225 OCR1A = SLEEP_COMPARE; | |
| 0 | 226 // interrupt |
| 2 | 227 TIMSK1 = _BV(OCIE1A); |
| 0 | 228 } |
| 229 | |
| 230 static void | |
| 231 uart_on() | |
| 232 { | |
| 233 // Power reduction register | |
| 234 PRR &= ~_BV(PRUSART0); | |
| 235 | |
| 236 // All of this needs to be done each time after turning off the PRR | |
| 237 // baud rate | |
| 238 UBRR0H = (unsigned char)(UBRR >> 8); | |
| 239 UBRR0L = (unsigned char)UBRR; | |
| 240 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0); | |
| 241 //8N1 | |
| 242 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); | |
| 243 } | |
| 244 | |
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245 #ifdef SIM_DEBUG |
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246 static char sim_out[140]; |
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247 static uint8_t sim_idx = 0; |
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248 static uint8_t last_sim_idx = 0; |
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249 #endif |
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250 |
| 0 | 251 int |
| 252 uart_putchar(char c, FILE *stream) | |
| 253 { | |
| 254 // XXX could perhaps sleep in the loop for power. | |
| 255 if (c == '\n') | |
| 256 { | |
| 257 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 258 UDR0 = '\r'; | |
| 259 } | |
| 260 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 261 UDR0 = c; | |
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262 #ifdef SIM_DEBUG |
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263 sim_out[sim_idx] = c; |
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264 sim_idx++; |
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265 sim_idx %= sizeof(sim_out); |
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266 #endif |
| 0 | 267 if (c == '\r') |
| 268 { | |
| 269 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 270 UDR0 = '\n'; | |
| 271 } | |
| 272 return (unsigned char)c; | |
| 273 } | |
| 274 | |
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275 uint8_t find_file_in_dir(struct fat_fs_struct* fs, struct fat_dir_struct* dd, const char* name, struct fat_dir_entry_struct* dir_entry) |
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276 { |
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277 while(fat_read_dir(dd, dir_entry)) |
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278 { |
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279 if(strcmp(dir_entry->long_name, name) == 0) |
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280 { |
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281 fat_reset_dir(dd); |
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282 return 1; |
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283 } |
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284 } |
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285 |
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286 return 0; |
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287 } |
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288 |
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289 struct fat_file_struct* |
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290 open_file_in_dir(struct fat_fs_struct* fs, struct fat_dir_struct* dd, const char* name) |
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291 { |
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292 struct fat_dir_entry_struct file_entry; |
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293 if(!find_file_in_dir(fs, dd, name, &file_entry)) |
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294 return 0; |
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295 |
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296 return fat_open_file(fs, &file_entry); |
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297 } |
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298 |
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299 static void |
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300 hmac_file(const char* fn) |
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301 { |
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302 sd_raw_init(); |
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303 struct partition_struct* partition = partition_open(sd_raw_read, sd_raw_read_interval, 0, 0, 0); |
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304 struct fat_fs_struct* fs = fat_open(partition); |
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305 struct fat_dir_entry_struct directory; |
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306 fat_get_dir_entry_of_path(fs, "/", &directory); |
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307 |
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308 struct sd_raw_info disk_info; |
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309 sd_raw_get_info(&disk_info); |
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310 printf("diskinfo size %d", disk_info.capacity); |
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311 |
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312 struct fat_dir_struct* dd = fat_open_dir(fs, &directory); |
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313 struct fat_file_struct* fd = open_file_in_dir(fs, dd, "fn"); |
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314 |
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315 char c = 0; |
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316 char buf[512]; |
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317 for (int i = 0; i < 10; i++) |
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318 { |
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319 fat_read_file(fd, buf, sizeof(buf)); |
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320 c ^= buf[0]; |
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321 } |
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322 printf("total %d\n", c); |
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323 } |
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324 |
| 20 | 325 static void cmd_reset() __attribute__ ((noreturn)); |
| 0 | 326 static void |
| 20 | 327 cmd_reset() |
| 0 | 328 { |
| 329 printf_P(PSTR("reset\n")); | |
| 330 _delay_ms(100); | |
| 331 cli(); // disable interrupts | |
| 332 wdt_enable(WDTO_15MS); // enable watchdog | |
| 333 while(1); // wait for watchdog to reset processor | |
| 334 } | |
| 335 | |
| 2 | 336 static void |
| 337 cmd_newboot() | |
| 338 { | |
| 339 set_pi_boot_normal(1); | |
| 340 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 341 { | |
| 342 newboot_count = newboot_limit; | |
| 343 } | |
| 20 | 344 printf_P(PSTR("newboot for %d secs\n"), newboot_limit); |
| 2 | 345 } |
| 346 | |
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347 static void |
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348 cmd_oldboot() |
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349 { |
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350 set_pi_boot_normal(0); |
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351 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
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352 { |
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353 newboot_count = 0; |
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354 } |
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355 printf_P(PSTR("back to old boot\n")); |
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356 } |
| 1 | 357 |
| 0 | 358 |
| 359 static void | |
| 20 | 360 cmd_status() |
| 0 | 361 { |
| 2 | 362 uint32_t cur_watchdog_long, cur_watchdog_short, cur_newboot, cur_oneshot; |
| 20 | 363 struct epoch_ticks t; |
| 364 | |
| 365 get_epoch_ticks(&t); | |
| 366 | |
| 1 | 367 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
| 368 { | |
| 2 | 369 cur_watchdog_long = watchdog_long_count; |
| 370 cur_watchdog_short = watchdog_short_count; | |
| 371 cur_newboot = newboot_count; | |
| 372 cur_oneshot = oneshot_count; | |
| 1 | 373 } |
| 374 | |
| 20 | 375 printf_P(PSTR("limit (current)\n" |
| 376 "watchdog_long %lu (%lu) watchdog newboot mode %d\n" | |
| 377 "watchdog_short %lu (%lu)\n" | |
| 378 "newboot %lu (%lu)\n" | |
| 379 "oneshot (%lu)\n" | |
| 380 "uptime %lu rem %u\n" | |
| 22 | 381 "boot normal %hhu\n" |
| 20 | 382 ), |
| 383 watchdog_long_limit, cur_watchdog_long, long_reboot_mode, | |
| 384 watchdog_short_limit, cur_watchdog_short, | |
| 385 newboot_limit, cur_newboot, | |
| 386 cur_oneshot, | |
| 22 | 387 t.ticks, t.rem, |
| 388 boot_normal_status); | |
| 0 | 389 } |
| 390 | |
| 391 static void | |
| 1 | 392 cmd_set_params(const char *params) |
| 0 | 393 { |
| 1 | 394 uint32_t new_watchdog_long_limit; |
| 395 uint32_t new_watchdog_short_limit; | |
| 396 uint32_t new_newboot_limit; | |
| 397 | |
| 398 int ret = sscanf_P(params, PSTR("%lu %lu %lu"), | |
| 399 &new_watchdog_long_limit, | |
| 400 &new_watchdog_short_limit, | |
| 401 &new_newboot_limit); | |
| 402 | |
| 403 if (ret != 3) | |
| 0 | 404 { |
| 1 | 405 printf_P(PSTR("Bad values\n")); |
| 406 } | |
| 407 else | |
| 408 { | |
| 409 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 410 { | |
| 411 eeprom_write(new_watchdog_long_limit, watchdog_long_limit); | |
| 412 eeprom_write(new_watchdog_short_limit, watchdog_short_limit); | |
| 413 eeprom_write(new_newboot_limit, newboot_limit); | |
| 414 uint16_t magic = EXPECT_MAGIC; | |
| 415 eeprom_write(magic, magic); | |
| 0 | 416 } |
| 1 | 417 printf_P(PSTR("set_params for next boot\n")); |
| 418 printf_P(PSTR("watchdog_long %lu watchdog_short %lu newboot %lu\n"), | |
| 419 new_watchdog_long_limit, | |
| 420 new_watchdog_short_limit, | |
| 421 new_newboot_limit); | |
| 422 } | |
| 423 } | |
| 0 | 424 |
| 35 | 425 // returns 1 if they are equal, timing independent |
| 426 static uint8_t | |
| 427 safe_mem_eq(const uint8_t *a, const uint8_t *b, int len) | |
| 428 { | |
| 429 uint8_t result = 0; | |
| 430 for (int i = 0; i < len; i++) | |
| 431 { | |
| 432 result |= a[i] ^ b[i]; | |
| 433 } | |
| 434 return result == 0; | |
| 435 } | |
| 436 | |
| 437 // returns 1 if they are equal | |
| 438 static uint8_t | |
| 439 safe_str_eq(const char *a, const char *b) | |
| 440 { | |
| 441 int la = strlen(a); | |
| 442 if (la != strlen(b)) | |
| 443 { | |
| 444 return 0; | |
| 445 } | |
| 446 return safe_mem_eq((const uint8_t*)a, (const uint8_t*)b, la); | |
| 447 } | |
| 448 | |
| 1 | 449 uint8_t from_hex(char c) |
| 450 { | |
| 451 if (c >= '0' && c <= '9') { | |
| 452 return c-'0'; | |
| 453 } | |
| 454 if (c >= 'a' && c <= 'f') { | |
| 455 return c-'a' + 0xa; | |
| 456 } | |
| 457 if (c >= 'A' && c <= 'F') { | |
| 458 return c-'A' + 0xa; | |
| 459 } | |
| 460 return 0; | |
| 461 } | |
| 462 | |
| 2 | 463 static void |
| 464 printhex_nibble(const unsigned char b, FILE *stream) | |
| 465 { | |
| 466 unsigned char c = b & 0x0f; | |
| 467 if ( c > 9 ) { | |
| 468 c += 'A'-10; | |
| 469 } | |
| 470 else { | |
| 471 c += '0'; | |
| 472 } | |
| 473 fputc(c, stream); | |
| 474 } | |
| 475 | |
| 476 void | |
| 477 printhex_byte(const unsigned char b, FILE *stream) | |
| 478 { | |
| 479 printhex_nibble( b >> 4, stream); | |
| 480 printhex_nibble( b, stream); | |
| 481 } | |
| 482 | |
| 483 void | |
| 484 printhex(uint8_t *id, uint8_t n, FILE *stream) | |
| 485 { | |
| 486 for (uint8_t i = 0; i < n; i++) | |
| 487 { | |
| 488 printhex_byte(id[i], stream); | |
| 489 } | |
| 490 } | |
| 491 | |
| 492 static int8_t | |
| 5 | 493 parse_key(const char *params, uint8_t *key_index, uint8_t *bytes, |
| 494 uint8_t bytes_len) | |
| 2 | 495 { |
| 496 // "N HEXKEY" | |
| 5 | 497 if (strlen(params) != bytes_len*2 + 2) { |
| 20 | 498 printf_P(PSTR("Wrong length key. wanted %d, got %d, '%s'\n"), |
| 499 bytes_len*2+2, strlen(params), params); | |
| 2 | 500 return -1; |
| 501 } | |
| 502 | |
| 503 if (params[1] != ' ') | |
| 504 { | |
| 505 printf_P(PSTR("Missing space\n")); | |
| 506 return -1; | |
| 507 } | |
| 508 | |
| 509 *key_index = from_hex(params[0]); | |
| 510 if (*key_index >= NKEYS) | |
| 511 { | |
| 512 printf_P(PSTR("Bad key index %d, max %d\n"), *key_index, NKEYS); | |
| 513 return -1; | |
| 514 } | |
| 515 | |
| 5 | 516 for (int i = 0, p = 0; i < bytes_len; i++, p += 2) |
| 2 | 517 { |
| 518 bytes[i] = (from_hex(params[p+2]) << 4) | from_hex(params[p+3]); | |
| 519 } | |
| 520 return 0; | |
| 521 } | |
| 522 | |
| 1 | 523 static void |
| 524 cmd_set_avr_key(const char *params) | |
| 525 { | |
| 2 | 526 uint8_t new_key[KEYLEN]; |
| 527 uint8_t key_index; | |
| 5 | 528 if (parse_key(params, &key_index, new_key, sizeof(new_key)) != 0) |
| 2 | 529 { |
| 1 | 530 return; |
| 0 | 531 } |
| 2 | 532 memcpy(avr_keys[key_index], new_key, sizeof(new_key)); |
| 8 | 533 #ifndef SIM_DEBUG |
| 2 | 534 eeprom_write(avr_keys, avr_keys); |
| 8 | 535 #endif |
| 20 | 536 printf_P(PSTR("Set key %d: "), key_index); |
| 537 printhex(new_key, sizeof(new_key), stdout); | |
| 538 putchar('\n'); | |
| 2 | 539 } |
| 540 | |
| 541 static void | |
| 542 cmd_hmac(const char *params) | |
| 543 { | |
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544 uint8_t indata[2+HMACLEN] = {'H', ':'}; |
| 7 | 545 uint8_t outdata[HMACLEN]; |
| 2 | 546 uint8_t key_index; |
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547 if (parse_key(params, &key_index, &indata[2], HMACLEN) != 0) |
| 2 | 548 { |
| 549 printf_P(PSTR("FAIL: Bad input\n")); | |
| 5 | 550 return; |
| 2 | 551 } |
| 0 | 552 |
| 8 | 553 #ifndef SIM_DEBUG |
| 5 | 554 long_delay(200); |
| 8 | 555 #endif |
| 5 | 556 |
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557 hmac_sha1(outdata, avr_keys[key_index], KEYLEN*8, indata, sizeof(indata)*8); |
| 2 | 558 printf_P(PSTR("HMAC: ")); |
| 7 | 559 printhex(outdata, HMACLEN, stdout); |
| 20 | 560 putchar('\n'); |
| 5 | 561 } |
| 562 | |
| 563 static void | |
| 564 cmd_decrypt(const char *params) | |
| 565 { | |
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566 uint8_t indata[HMACLEN+AESLEN]; // XXX |
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567 // a temporary buffer |
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568 uint8_t output[HMACLEN] = {'D', ':'}; |
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569 _Static_assert(AESLEN+2 <= sizeof(output), "sufficient output buffer"); |
| 5 | 570 uint8_t key_index; |
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571 if (parse_key(params, &key_index, indata, sizeof(indata)) != 0) |
| 5 | 572 { |
| 573 printf_P(PSTR("FAIL: Bad input\n")); | |
| 574 return; | |
| 575 } | |
| 576 | |
| 8 | 577 #ifndef SIM_DEBUG |
| 5 | 578 long_delay(200); |
| 8 | 579 #endif |
| 7 | 580 |
| 5 | 581 // check the signature |
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582 memcpy(&output[2], &indata[HMACLEN], AESLEN); |
| 12 | 583 hmac_sha1(output, avr_keys[key_index], KEYLEN*8, output, (2+AESLEN)*8); |
| 5 | 584 |
| 35 | 585 if (!safe_mem_eq(output, indata, HMACLEN)) { |
| 5 | 586 printf_P(PSTR("FAIL: hmac mismatch\n")); |
| 587 } | |
| 588 | |
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589 uint8_t tmpbuf[256]; |
| 27 | 590 aesInit(avr_keys[key_index], tmpbuf); |
| 591 aesDecrypt(&indata[HMACLEN], NULL); | |
| 5 | 592 |
| 593 printf_P(PSTR("DECRYPTED: ")); | |
| 594 printhex(output, AESLEN, stdout); | |
| 20 | 595 putchar('\n'); |
| 2 | 596 } |
| 597 | |
| 598 static void | |
| 599 cmd_oneshot_reboot(const char *params) | |
| 600 { | |
| 601 uint32_t new_delay = strtoul(params, NULL, 10); | |
| 602 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 1 | 603 { |
| 2 | 604 oneshot_count = new_delay; |
| 1 | 605 } |
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606 printf_P(PSTR("oneshot new delay %lu\n"), new_delay); |
| 0 | 607 } |
| 608 | |
| 609 static void | |
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610 clamp_params() |
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611 { |
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612 if (watchdog_long_limit < WATCHDOG_LONG_MIN |
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613 || watchdog_long_limit > WATCHDOG_LONG_MAX) |
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614 { |
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615 watchdog_long_limit = WATCHDOG_LONG_DEFAULT; |
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616 } |
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617 |
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618 if (watchdog_short_limit != 0 |
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619 && watchdog_short_limit < WATCHDOG_SHORT_MIN) |
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620 { |
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621 watchdog_short_limit = 0; |
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622 } |
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623 |
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624 if (newboot_limit < NEWBOOT_MIN || newboot_limit > NEWBOOT_MAX) |
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625 { |
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626 newboot_limit = NEWBOOT_DEFAULT; |
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627 } |
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628 } |
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629 |
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630 static void |
| 0 | 631 load_params() |
| 632 { | |
| 633 uint16_t magic; | |
| 634 eeprom_read(magic, magic); | |
| 635 if (magic == EXPECT_MAGIC) | |
| 636 { | |
| 1 | 637 eeprom_read(watchdog_long_limit, watchdog_long_limit); |
| 638 eeprom_read(watchdog_short_limit, watchdog_short_limit); | |
| 2 | 639 eeprom_read(newboot_limit, newboot_limit); |
| 1 | 640 } |
| 2 | 641 |
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642 clamp_params(); |
| 16 | 643 |
| 2 | 644 eeprom_read(avr_keys, avr_keys); |
| 0 | 645 } |
| 646 | |
| 2 | 647 static void |
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648 cmd_alive() |
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649 { |
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650 printf_P(PSTR("Ah, good.\n")); |
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651 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
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652 { |
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653 watchdog_long_count = 0; |
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654 watchdog_short_count = 0; |
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655 } |
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656 long_reboot_mode = 0; |
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657 } |
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658 |
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659 static void |
| 35 | 660 cmd_poke() |
| 661 { | |
| 662 printf_P(PSTR("Ah, good.\n")); | |
| 663 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 664 { | |
| 665 watchdog_short_count = 0; | |
| 666 } | |
| 667 } | |
| 668 | |
| 669 static void | |
| 2 | 670 cmd_vcc() |
| 0 | 671 { |
| 2 | 672 uint16_t vcc = adc_vcc(); |
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673 uint16_t v5 = adc_5v(vcc); |
| 21 | 674 uint16_t temp = adc_temp(); |
| 675 // roughly? | |
| 676 uint16_t temp_deg = temp - 290; | |
| 677 printf_P(PSTR("vcc: %u mV\n" | |
| 678 "5v: %u mV\n" | |
| 26 | 679 "temp: %u mV (%dºC)\n" |
| 680 ), | |
| 27 | 681 vcc, v5, temp, temp_deg); |
| 0 | 682 } |
| 683 | |
| 20 | 684 |
| 27 | 685 void(*bootloader)() __attribute__ ((noreturn)) = (void*)0x7800; |
| 686 | |
| 20 | 687 #ifndef PROG_PASSWORD |
| 688 #define PROG_PASSWORD "Y2vvjxO5" | |
| 689 #endif | |
| 690 | |
| 691 static void | |
| 692 cmd_prog(const char* arg) | |
| 693 { | |
| 36 | 694 if (!safe_str_eq(arg, PROG_PASSWORD)) |
| 20 | 695 { |
| 696 printf_P(PSTR("Bad prog password\n")); | |
| 697 return; | |
| 698 } | |
| 699 | |
| 36 | 700 printf_P(PSTR("Programming...\n")); |
| 701 long_delay(100); | |
| 702 | |
| 20 | 703 // disable wdt |
| 704 wdt_disable(); | |
| 705 | |
| 706 // disable interrupts | |
| 707 TIMSK0 = 0; | |
| 708 TIMSK1 = 0; | |
| 709 TIMSK2 = 0; | |
| 710 EIMSK = 0; | |
| 711 PCMSK0 = 0; | |
| 712 PCMSK1 = 0; | |
| 713 PCMSK2 = 0; | |
| 714 ACSR &= ~_BV(ACIE); | |
| 715 ADCSRA &= ~_BV(ADIE); | |
| 716 UCSR0B &= ~_BV(RXCIE0); | |
| 717 UCSR0B &= _BV(TXCIE0); | |
| 718 // doesn't do TWI, other uart, probably others | |
| 719 | |
| 720 _delay_ms(20); | |
| 721 | |
| 722 bootloader(); | |
| 723 } | |
| 27 | 724 |
| 725 | |
| 726 static void | |
| 727 adc_sleep() | |
| 728 { | |
| 729 set_sleep_mode(SLEEP_MODE_IDLE); | |
| 730 sleep_mode(); | |
| 731 } | |
| 732 | |
| 733 #define BITSET(v, n) (((v) >> (n)) & 1) | |
| 734 | |
| 735 static inline uint8_t | |
| 736 popcnt(uint8_t v) | |
| 737 { | |
| 738 return BITSET(v, 0) | |
| 739 + BITSET(v, 1) | |
| 740 + BITSET(v, 2) | |
| 741 + BITSET(v, 3) | |
| 742 + BITSET(v, 4) | |
| 743 + BITSET(v, 5) | |
| 744 + BITSET(v, 6) | |
| 745 + BITSET(v, 7); | |
| 746 } | |
| 747 | |
| 748 static uint8_t | |
| 749 adc_bit() | |
| 750 { | |
| 751 ADCSRA |= _BV(ADSC); | |
| 752 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 753 uint8_t low = ADCL; | |
| 754 uint8_t high = ADCH; | |
| 35 | 755 uint8_t ret = (popcnt(low)&1) ^ (popcnt(high)&1); |
| 756 return ret; | |
| 27 | 757 } |
| 758 | |
| 759 static void | |
| 760 adc_random(uint8_t admux, | |
| 761 uint8_t *out, uint16_t num, uint32_t *tries) | |
| 762 { | |
| 763 PRR &= ~_BV(PRADC); | |
| 764 // /16 prescaler for 691mhz, no interrupt | |
| 765 ADCSRA = _BV(ADEN) | _BV(ADPS2); | |
| 766 | |
| 35 | 767 ADMUX = admux; |
| 768 | |
| 27 | 769 *tries = 0; |
| 770 for (int i = 0; i < num; i++) | |
| 771 { | |
| 35 | 772 uint8_t ret = 0; |
| 773 uint8_t count = 0; | |
| 774 | |
| 27 | 775 while (count <= 7) |
| 776 { | |
| 777 (*tries)++; | |
| 778 | |
| 779 // Von Neumann extractor | |
| 780 uint8_t one = adc_bit(); | |
| 781 uint8_t two = adc_bit(); | |
| 782 if (one == two) | |
| 783 { | |
| 784 continue; | |
| 785 } | |
| 786 ret |= one << count; | |
| 787 count++; | |
| 788 } | |
| 789 out[i] = ret; | |
| 790 } | |
| 791 ADCSRA = 0; | |
| 792 PRR |= _BV(PRADC); | |
| 793 } | |
| 794 | |
| 795 ISR(ADC_vect) | |
| 796 { | |
| 797 adc_done = 1; | |
| 798 } | |
| 799 | |
| 800 static void | |
| 801 adc_generic(uint8_t admux, uint8_t *ret_num, uint16_t *ret_sum) | |
| 802 { | |
| 803 PRR &= ~_BV(PRADC); | |
| 804 | |
| 31 | 805 // /128 prescaler (86kHz), interrupt |
| 806 ADCSRA = _BV(ADEN) | |
| 807 | _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0) | |
| 808 | _BV(ADIE); | |
| 27 | 809 |
| 810 // set to measure 1.1 reference | |
| 811 ADMUX = admux; | |
| 812 | |
| 813 // delay after setting reference etc, allow settling | |
| 814 long_delay(300); | |
| 815 // average a number of samples | |
| 816 uint16_t sum = 0; | |
| 817 uint8_t num = 0; | |
| 818 for (uint8_t n = 0; n < 20; n++) | |
| 819 { | |
| 820 while (1) | |
| 821 { | |
| 822 adc_done = 0; | |
| 823 ADCSRA |= _BV(ADSC); | |
| 824 adc_sleep(); | |
| 825 | |
| 826 uint8_t done; | |
| 827 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 828 { | |
| 829 done = adc_done; | |
| 830 } | |
| 831 if (done) | |
| 832 { | |
| 833 break; | |
| 834 } | |
| 835 } | |
| 836 | |
| 837 uint8_t low_11 = ADCL; | |
| 838 uint8_t high_11 = ADCH; | |
| 839 uint16_t val = low_11 + (high_11 << 8); | |
| 840 | |
| 841 if (n >= 4) | |
| 842 { | |
| 843 sum += val; | |
| 844 num++; | |
| 845 } | |
| 846 } | |
| 847 ADCSRA = 0; | |
| 848 PRR |= _BV(PRADC); | |
| 849 | |
| 850 *ret_num = num; | |
| 851 *ret_sum = sum; | |
| 852 } | |
| 853 | |
| 854 static uint16_t | |
| 855 adc_vcc() | |
| 856 { | |
| 857 const uint8_t mux = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); | |
| 858 uint16_t sum; | |
| 859 uint8_t num; | |
| 860 | |
| 861 adc_generic(mux, &num, &sum); | |
| 862 | |
| 863 //float res_volts = 1.1 * 1024 * num / sum; | |
| 864 //return 1000 * res_volts; | |
| 865 return ((uint32_t)1100*1024*num) / sum; | |
| 866 } | |
| 867 | |
| 868 #define SCALER_5V 2 | |
| 869 | |
| 870 static uint16_t | |
| 871 adc_5v(uint16_t vcc) | |
| 872 { | |
| 873 // set to measure ADC4 against AVCC | |
| 874 const uint8_t mux = _BV(REFS0) | _BV(MUX2); | |
| 875 uint16_t sum; | |
| 876 uint8_t num; | |
| 877 | |
| 878 adc_generic(mux, &num, &sum); | |
| 879 | |
| 880 return ((uint32_t)vcc*sum*SCALER_5V/(num*1024)); | |
| 881 } | |
| 882 | |
| 883 static uint16_t | |
| 884 adc_temp() | |
| 885 { | |
| 886 // set to measure temperature against 1.1v reference. | |
| 887 const uint8_t mux = _BV(REFS0) | _BV(REFS1) | _BV(MUX3); | |
| 888 uint16_t sum; | |
| 889 uint8_t num; | |
| 890 | |
| 891 adc_generic(mux, &num, &sum); | |
| 892 | |
| 893 // return the voltage | |
| 894 | |
| 895 return ((uint32_t)1100*sum) / (num*1024); | |
| 896 } | |
| 897 | |
| 898 static void | |
| 899 cmd_random(const char* params) | |
| 900 { | |
| 901 uint8_t admux; | |
| 902 uint16_t num; | |
| 903 uint8_t buf[100]; | |
| 904 | |
| 905 int ret = sscanf_P(params, PSTR("%hhu %u"), | |
| 906 &admux, &num); | |
| 907 if (!ret) | |
| 908 { | |
| 909 printf_P(PSTR("Bad arguments\n")); | |
| 910 return; | |
| 911 } | |
| 912 uint32_t tries = 0; | |
| 913 printf_P(PSTR("output: ")); | |
| 914 for (int i = 0; i < num; i+= sizeof(buf)) | |
| 915 { | |
| 916 uint32_t t; | |
| 917 uint16_t nr = MIN(num-i, sizeof(buf)); | |
| 918 adc_random(admux, buf, nr, &t); | |
| 919 printhex(buf, nr, stdout); | |
| 920 tries += t; | |
| 921 } | |
| 922 putchar('\n'); | |
| 923 printf_P(PSTR("%ld tries\n"), tries); | |
| 924 } | |
| 925 | |
| 926 | |
| 20 | 927 |
| 0 | 928 static void |
| 929 read_handler() | |
| 930 { | |
| 17 | 931 #define LOCAL_PSTR(x) const static char x ## _str[] PROGMEM = #x; |
| 932 #define LOCAL_HELP(x, d) const static char x ## _help[] PROGMEM = d; | |
| 933 | |
| 934 LOCAL_PSTR(set_params); | |
| 935 LOCAL_PSTR(set_key); | |
| 936 LOCAL_PSTR(oneshot); | |
| 937 LOCAL_PSTR(hmac); | |
| 938 LOCAL_PSTR(decrypt); | |
| 939 LOCAL_PSTR(alive); | |
| 35 | 940 LOCAL_PSTR(poke); |
| 17 | 941 LOCAL_PSTR(vcc); |
| 942 LOCAL_PSTR(reset); | |
| 943 LOCAL_PSTR(newboot); | |
| 944 LOCAL_PSTR(oldboot); | |
| 20 | 945 LOCAL_PSTR(status); |
| 27 | 946 LOCAL_PSTR(random); |
| 947 LOCAL_PSTR(prog); | |
| 17 | 948 LOCAL_HELP(set_params, "<long_limit> <short_limit> <newboot_limit>"); |
| 949 LOCAL_HELP(set_key, "20_byte_hex>"); | |
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950 LOCAL_HELP(oneshot, "<timeout>"); |
| 27 | 951 LOCAL_HELP(prog, "<password>"); |
| 952 LOCAL_HELP(random, "<admux> <nbytes>"); | |
| 17 | 953 LOCAL_HELP(hmac, "<key_index> <20_byte_hex_data>"); |
| 954 LOCAL_HELP(decrypt, "<key_index> <20_byte_hmac|16_byte_aes_block>"); | |
| 955 | |
| 956 static const struct handler { | |
| 957 PGM_P name; | |
| 958 void(*cmd)(const char *param); | |
| 959 // existence of arg_help indicates if the cmd takes a parameter. | |
| 960 PGM_P arg_help; | |
| 20 | 961 } handlers[] PROGMEM = |
| 17 | 962 { |
| 20 | 963 {alive_str, cmd_alive, NULL}, |
| 35 | 964 {poke_str, cmd_poke, NULL}, |
| 20 | 965 {newboot_str, cmd_newboot, NULL}, |
| 966 {oldboot_str, cmd_oldboot, NULL}, | |
| 967 {oneshot_str, cmd_oneshot_reboot, oneshot_help}, | |
| 968 {status_str, cmd_status, NULL}, | |
| 969 {hmac_str, cmd_hmac, hmac_help}, | |
| 970 {decrypt_str, cmd_decrypt, decrypt_help}, | |
| 17 | 971 {set_params_str, cmd_set_params, set_params_help}, |
| 972 {set_key_str, cmd_set_avr_key, set_key_help}, | |
| 27 | 973 {random_str, cmd_random, random_help}, |
| 17 | 974 {vcc_str, cmd_vcc, NULL}, |
| 975 {reset_str, cmd_reset, NULL}, | |
| 27 | 976 {prog_str, cmd_prog, prog_help}, |
| 17 | 977 }; |
| 978 | |
| 979 if (readbuf[0] == '\0') | |
| 980 { | |
| 981 return; | |
| 982 } | |
| 983 | |
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984 if (strcmp_P(readbuf, PSTR("help")) == 0) |
| 17 | 985 { |
| 986 printf_P(PSTR("Commands:---\n")); | |
| 987 for (int i = 0; i < sizeof(handlers) / sizeof(handlers[0]); i++) | |
| 988 { | |
| 989 struct handler h; | |
| 990 memcpy_P(&h, &handlers[i], sizeof(h)); | |
| 991 printf_P(h.name); | |
| 992 if (h.arg_help) | |
| 993 { | |
| 994 putchar(' '); | |
| 995 printf_P(h.arg_help); | |
| 996 } | |
| 997 putchar('\n'); | |
| 998 }; | |
| 999 printf_P(PSTR("---\n")); | |
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1000 return; |
| 17 | 1001 } |
| 1002 | |
| 1003 for (int i = 0; i < sizeof(handlers) / sizeof(handlers[0]); i++) | |
| 1004 { | |
| 1005 struct handler h; | |
| 1006 memcpy_P(&h, &handlers[i], sizeof(h)); | |
| 1007 | |
| 1008 const int h_len = strlen_P(h.name); | |
| 1009 if (strncmp_P(readbuf, h.name, h_len) == 0) | |
| 1010 { | |
| 1011 if (h.arg_help) | |
| 1012 { | |
| 1013 if (readbuf[h_len] == ' ') | |
| 1014 { | |
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1015 h.cmd(&readbuf[h_len+1]); |
| 17 | 1016 return; |
| 1017 } | |
| 1018 } | |
| 1019 else | |
| 1020 { | |
| 1021 if (readbuf[h_len] == '\0') | |
| 1022 { | |
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1023 void(*void_cmd)() = h.cmd; |
| 17 | 1024 void_cmd(); |
| 1025 return; | |
| 1026 } | |
| 1027 } | |
| 1028 } | |
| 1029 } | |
| 1030 | |
| 1031 printf_P(PSTR("Bad command '%s'\n"), readbuf); | |
| 0 | 1032 } |
| 1033 | |
| 1034 ISR(INT0_vect) | |
| 1035 { | |
| 1036 blink(); | |
| 1037 _delay_ms(100); | |
| 1038 blink(); | |
| 1039 } | |
| 1040 | |
| 1041 ISR(USART_RX_vect) | |
| 1042 { | |
| 1043 char c = UDR0; | |
| 1044 #ifdef HAVE_UART_ECHO | |
| 1045 uart_putchar(c, NULL); | |
| 1046 #endif | |
| 1047 if (c == '\r' || c == '\n') | |
| 1048 { | |
| 1049 if (readpos > 0) | |
| 1050 { | |
| 1051 readbuf[readpos] = '\0'; | |
| 1052 have_cmd = 1; | |
| 1053 readpos = 0; | |
| 1054 } | |
| 1055 } | |
| 1056 else | |
| 1057 { | |
| 1058 readbuf[readpos] = c; | |
| 1059 readpos++; | |
| 1060 if (readpos >= sizeof(readbuf)) | |
| 1061 { | |
| 1062 readpos = 0; | |
| 1063 } | |
| 1064 } | |
| 1065 } | |
| 1066 | |
| 2 | 1067 ISR(TIMER1_COMPA_vect) |
| 0 | 1068 { |
| 2 | 1069 TCNT1 = 0; |
| 0 | 1070 |
| 1071 clock_epoch += TICK; | |
| 1072 | |
| 1 | 1073 // watchdogs count up, continuous |
| 1074 if (watchdog_long_limit > 0) { | |
| 2 | 1075 watchdog_long_count += TICK; |
| 1 | 1076 if (watchdog_long_count >= watchdog_long_limit) |
| 1077 { | |
| 1078 watchdog_long_count = 0; | |
| 1079 watchdog_long_hit = 1; | |
| 1080 } | |
| 0 | 1081 } |
| 1082 | |
| 1 | 1083 if (watchdog_short_limit > 0) { |
| 2 | 1084 watchdog_short_count += TICK; |
| 1 | 1085 if (watchdog_short_count >= watchdog_short_limit) |
| 1086 { | |
| 1087 watchdog_short_count = 0; | |
| 1088 watchdog_short_hit = 1; | |
| 1089 } | |
| 0 | 1090 } |
| 1091 | |
| 2 | 1092 // newboot counts down |
| 1 | 1093 if (newboot_count > 0) |
| 0 | 1094 { |
| 2 | 1095 newboot_count-=TICK; |
| 1096 if (newboot_count <= 0) | |
| 1 | 1097 { |
| 1098 newboot_hit = 1; | |
| 2 | 1099 newboot_count = 0; |
| 1 | 1100 } |
| 0 | 1101 } |
| 1 | 1102 |
| 2 | 1103 if (oneshot_count > 0) |
| 1104 { | |
| 1105 oneshot_count-=TICK; | |
| 1106 if (oneshot_count <= 0) | |
| 1107 { | |
| 1108 oneshot_hit = 1; | |
| 1109 oneshot_count = 0; | |
| 1110 } | |
| 1111 } | |
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1112 |
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1113 if (reboot_count > 0) |
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1114 { |
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1115 reboot_count -= TICK; |
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1116 if (reboot_count <= 0) |
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1117 { |
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1118 reboot_hit = 1; |
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1119 reboot_count = 0; |
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1120 } |
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1121 } |
| 0 | 1122 } |
| 1123 | |
| 1124 static void | |
| 1125 idle_sleep() | |
| 1126 { | |
| 1127 set_sleep_mode(SLEEP_MODE_IDLE); | |
| 1128 sleep_mode(); | |
| 1129 } | |
| 1130 | |
| 21 | 1131 static void |
| 2 | 1132 reboot_pi() |
| 1133 { | |
|
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1134 printf_P(PSTR("Real reboot now\n")); |
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1135 // pull it low for 200ms |
| 2 | 1136 PORT_PI_RESET &= ~_BV(PIN_PI_RESET); |
| 1137 DDR_PI_RESET |= _BV(PIN_PI_RESET); | |
|
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1138 _delay_ms(200); |
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1139 |
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1140 PORT_PI_WARNING &= ~_BV(PIN_PI_WARNING); |
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1141 DDR_PI_RESET &= ~_BV(PIN_PI_RESET); |
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1142 } |
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1143 |
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1144 static void |
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1145 wait_reboot_pi() |
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1146 { |
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1147 PORT_PI_WARNING |= _BV(PIN_PI_WARNING); |
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1148 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
|
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1149 { |
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1150 reboot_count = WARNING_TIME; |
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1151 } |
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1152 printf_P(PSTR("Rebooting in %hhu seconds\n"), reboot_count); |
| 2 | 1153 } |
| 1154 | |
| 1155 static void | |
| 1156 set_pi_boot_normal(uint8_t normal) | |
| 1157 { | |
| 22 | 1158 boot_normal_status = normal; |
| 2 | 1159 PORT_PI_BOOT &= ~_BV(PIN_PI_BOOT); |
| 1160 if (normal) | |
| 1161 { | |
| 1162 // tristate | |
| 1163 DDR_PI_BOOT &= ~_BV(PIN_PI_BOOT); | |
| 1164 } | |
| 1165 else | |
| 1166 { | |
| 1167 // pull it low | |
| 1168 DDR_PI_RESET |= _BV(PIN_PI_BOOT); | |
| 1169 | |
| 1170 } | |
| 1171 } | |
| 1172 | |
| 1173 static void | |
| 1174 check_flags() | |
| 1175 { | |
|
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1176 if (watchdog_long_hit) |
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1177 { |
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1178 // alternate between booting normal and emergency |
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1179 if (long_reboot_mode) |
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1180 { |
|
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|
1181 cmd_newboot(); |
|
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1182 } |
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1183 long_reboot_mode ^= 1; |
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1184 } |
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1185 |
| 2 | 1186 if (watchdog_long_hit |
| 1187 || watchdog_short_hit | |
| 1188 || oneshot_hit) | |
| 1189 { | |
| 12 | 1190 printf_P(PSTR("Rebooting! long %d, short %d, oneshot %d\n"), |
| 1191 watchdog_long_hit, watchdog_short_hit, oneshot_hit); | |
|
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1192 wait_reboot_pi(); |
| 2 | 1193 } |
| 1194 | |
| 1195 if (newboot_hit) { | |
| 1196 set_pi_boot_normal(0); | |
| 1197 } | |
| 1198 | |
|
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1199 if (reboot_hit) { |
|
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1200 reboot_pi(); |
|
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1201 } |
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1202 |
| 2 | 1203 watchdog_long_hit = 0; |
| 1204 watchdog_short_hit = 0; | |
| 1205 newboot_hit = 0; | |
| 1206 oneshot_hit = 0; | |
|
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1207 reboot_hit = 0; |
| 2 | 1208 } |
| 1209 | |
| 1210 static void | |
| 0 | 1211 do_comms() |
| 1212 { | |
| 1213 // avoid receiving rubbish, perhaps | |
| 1214 uart_on(); | |
| 1215 | |
| 1216 // write sd card here? same 3.3v regulator... | |
| 1217 | |
| 1 | 1218 while (1) |
| 0 | 1219 { |
| 1 | 1220 wdt_reset(); |
| 2 | 1221 |
|
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1222 #ifdef SIM_DEBUG |
|
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1223 if (sim_idx != last_sim_idx) |
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1224 { |
|
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1225 last_sim_idx = sim_idx; |
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1226 } |
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1227 #endif |
|
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1228 |
| 2 | 1229 check_flags(); |
| 1230 | |
| 0 | 1231 if (have_cmd) |
| 1232 { | |
| 1233 have_cmd = 0; | |
| 1234 read_handler(); | |
| 1235 continue; | |
| 1236 } | |
| 1237 | |
| 1238 // wait for commands from the master | |
| 1239 idle_sleep(); | |
| 1240 } | |
| 1241 } | |
| 1242 | |
| 1243 static void | |
| 1244 blink() | |
| 1245 { | |
|
18
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|
1246 #if 0 |
|
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|
1247 PORT_ &= ~_BV(PIN_LED); |
| 0 | 1248 _delay_ms(1); |
| 1249 PORT_LED |= _BV(PIN_LED); | |
|
18
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|
1250 #endif |
| 0 | 1251 } |
| 1252 | |
| 1253 static void | |
| 22 | 1254 long_delay(uint16_t ms) |
| 0 | 1255 { |
| 22 | 1256 uint16_t iter = ms / 10; |
| 0 | 1257 |
| 22 | 1258 for (uint16_t i = 0; i < iter; i++) |
| 0 | 1259 { |
| 22 | 1260 _delay_ms(10); |
| 0 | 1261 } |
| 1262 } | |
| 1263 | |
| 1264 ISR(BADISR_vect) | |
| 1265 { | |
| 1266 //uart_on(); | |
| 1267 printf_P(PSTR("Bad interrupt\n")); | |
| 1268 } | |
| 1269 | |
| 20 | 1270 // disable watchdog on boot |
| 1271 void wdt_init(void) __attribute__((naked)) __attribute__((section(".init3"))); | |
| 1272 void wdt_init(void) | |
| 1273 { | |
| 1274 MCUSR = 0; | |
| 1275 wdt_disable(); | |
| 1276 } | |
| 1277 | |
| 0 | 1278 int main(void) |
| 1279 { | |
| 17 | 1280 _Static_assert(F_CPU % 256 == 0, "clock prescaler remainder 0"); |
| 1281 _Static_assert(NEWBOOT_MAX < WATCHDOG_LONG_MIN, "newboot max shorter than watchdog min"); | |
| 20 | 1282 _Static_assert((F_CPU)%(16*(BAUD)) == 0, "baud rate good multiple"); |
|
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|
1283 |
| 0 | 1284 setup_chip(); |
| 1285 blink(); | |
| 1286 | |
| 1287 stdout = &mystdout; | |
| 1288 uart_on(); | |
| 1289 | |
| 20 | 1290 long_delay(500); |
| 1291 printf_P(PSTR("Pi Watchdog\nMatt Johnston [email protected]\n")); | |
| 0 | 1292 |
| 2 | 1293 set_pi_boot_normal(0); |
| 1294 | |
| 0 | 1295 load_params(); |
| 1296 | |
| 1297 setup_tick_counter(); | |
| 1298 | |
| 1299 sei(); | |
| 1300 | |
| 8 | 1301 #if 0 |
| 1302 // encryption test | |
| 1303 cmd_set_avr_key("1 6161626263636464656566666767686800000000"); | |
| 1304 cmd_set_avr_key("2 7979757569696f6f646465656666717164646969"); | |
| 12 | 1305 //cmd_decrypt("1 ecd858ee07a8e16575723513d2d072a7565865e40ba302059bfc650d4491268448102119"); |
| 1306 cmd_decrypt("1 5a587b50fd48688bbda1b510cf9a3fab6fd4737b" "0ba302059bfc650d4491268448102119"); | |
| 1307 cmd_hmac("2 7979757569696f6f646465656666717164646969"); | |
| 8 | 1308 #endif |
| 1309 | |
| 1 | 1310 // doesn't return |
| 1311 do_comms(); | |
| 0 | 1312 |
| 1313 return 0; /* never reached */ | |
| 1314 } |