AVR Memory Architecture : Arduino / ATmega328p

 avr_timer0.h

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1 

41 #ifndef AVR_TIMER0_H_

42 #define AVR_TIMER0_H_

43 

44 #include <avr/io.h>

45 #include <avr/interrupt.h>

46 #include "avr_macros.h"

47 #include "avr_utils.h"

48 

49 #pragma message ( "avr_timer0.h included" )

50 

55 #define TIMER0_OC0A_NO_OUTPUT (0<<COM0A1) | (0<<COM0A0)

56 #define TIMER0_OC0A_TOGGLE_ON_MATCH (1<<COM0A0)

57 #define TIMER0_OC0A_CLEAR_ON_MATCH (1<<COM0A1)

58 #define TIMER0_OC0A_SET_ON_MATCH (1<<COM0A1) | (1<<COM0A0)

59 #define TIMER0_OC0A_NON_INVERTING (1<<COM0A1)

60 #define TIMER0_OC0A_INVERTING (1<<COM0A1) | (1<<COM0A0)

61 #define TIMER0_OC0A_MASK (1<<COM0A1) | (1<<COM0A0)

68 #define TIMER0_OC0B_NO_OUTPUT (0<<COM0B1) | (0<<COM0B0)

69 #define TIMER0_OC0B_TOGGLE_ON_MATCH (1<<COM0B0)

70 #define TIMER0_OC0B_CLEAR_ON_MATCH (1<<COM0B1)

71 #define TIMER0_OC0B_SET_ON_MATCH (1<<COM0B1) | (1<<COM0B0)

72 #define TIMER0_OC0B_NON_INVERTING (1<<COM0B1)

73 #define TIMER0_OC0B_INVERTING (1<<COM0B1) | (1<<COM0B0)

74 #define TIMER0_OC0B_MASK (1<<COM0B1) | (1<<COM0B0)

81 #define TIMER0_MODE_NORMAL (0<<WGM01) | (0<<WGM00)

82 #define TIMER0_MODE_PHASE_CORRECT_PWM (1<<WGM00)

83 #define TIMER0_MODE_CTC (1<<WGM01)

84 #define TIMER0_MODE_FAST_PWM (1<<WGM01) | (1<<WGM00)

85 #define TIMER0_MODE_MASK (1<<WGM01) | (1<<WGM00)

92 #define TIMER0_PWM_TOP_0xFF (0<<WGM02)

93 #define TIMER0_PWM_TOP_OCRA (1<<WGM02)

94 #define TIMER0_PWM_TOP_MASK (1<<WGM02)

101 #define TIMER0_PRESCALER_0 (0<<CS02) | (0<<CS01) | (0<<CS00)

102 #define TIMER0_PRESCALER_1 (1<<CS00)

103 #define TIMER0_PRESCALER_8 (1<<CS01)

104 #define TIMER0_PRESCALER_64 (1<<CS01) | (1<<CS00)

105 #define TIMER0_PRESCALER_256 (1<<CS02)

106 #define TIMER0_PRESCALER_1024 (1<<CS02) | (1<<CS00)

107 #define TIMER0_PRESCALER_MASK (1<<CS02) | (1<<CS01) | (1<<CS00)

114 #define TIMER0_COMPARE_MATCH_A_INTERRUPT (1<<OCIE0A)

115 #define TIMER0_COMPARE_MATCH_B_INTERRUPT (1<<OCIE0B)

116 #define TIMER0_OVERFLOW_INTERRUPT (1<<TOIE0)

123 static volatile uint32_t TIMER0_SystemTickCount = 0;

124 static volatile uint32_t TIMER0_SystemTickFrequency = 0;

125 static volatile uint8_t TIMER0_SystemTickTimePeriodUs = 0;

126 static volatile uint8_t TIMER0_SystemTickPerMs = 0;

133 typedef struct TIMER0_ConfigData

134 {

135  uint8_t TimerMode;

136  uint8_t Prescaler;

137  uint8_t OutputCompareModePinA;

138  uint8_t OutputCompareModePinB;

139  uint8_t OutputCompareRegisterA;

140  uint8_t OutputCompareRegisterB;

141  uint8_t TimerCounterRegister;

142  uint8_t SystemTickState;

143 } TIMER0_ConfigData;

150 inline void TIMER0_EnableOverflowInterrupt();

151 inline void TIMER0_DisableOverflowInterrupt();

158 inline void TIMER0_EnableCompareMatchAInterrupt();

159 inline void TIMER0_DisableCompareMatchAInterrupt();

166 inline void TIMER0_EnableCompareMatchBInterrupt();

167 inline void TIMER0_DisableCompareMatchBInterrupt();

174 inline void TIMER0_EnableAllInterrupt();

175 inline void TIMER0_DisableAllInterrupt();

182 void TIMER0_Init(TIMER0_ConfigData Data);

183 void TIMER0_DeInit();

190 inline void TIMER0_SetOCR0A(uint8_t Value);

191 inline void TIMER0_SetOCR0B(uint8_t Value);

198 uint32_t TIMER0_GetSystemTick();

199 uint64_t TIMER0_GetSystemTimeUs();

200 uint32_t TIMER0_GetSystemTimeMs();

207 uint32_t TIMER0_TickToUs(uint32_t Tick);

208 uint16_t TIMER0_UsToTick(uint16_t Time);

215 void TIMER0_DelayTick(uint16_t Tick);

216 void TIMER0_DelayUs(uint16_t Time);

217 void TIMER0_DelayMs(uint16_t Time);

225 inline void TIMER0_EnableOverflowInterrupt() /* Timer-0 Sample 1 */

226 {

227  TIMSK0 |= TIMER0_OVERFLOW_INTERRUPT;

228 }

229 

235 inline void TIMER0_DisableOverflowInterrupt()

236 {

237  TIMSK0 &= ~TIMER0_OVERFLOW_INTERRUPT;

238 }

239 

245 inline void TIMER0_EnableCompareMatchAInterrupt()

246 {

247  TIMSK0 |= TIMER0_COMPARE_MATCH_A_INTERRUPT;

248 }

249 

255 inline void TIMER0_DisableCompareMatchAInterrupt()

256 {

257  TIMSK0 &= ~TIMER0_COMPARE_MATCH_A_INTERRUPT;

258 }

259 

265 inline void TIMER0_EnableCompareMatchBInterrupt()

266 {

267  TIMSK0 |= TIMER0_COMPARE_MATCH_B_INTERRUPT;

268 }

269 

275 inline void TIMER0_DisableCompareMatchBInterrupt()

276 {

277  TIMSK0 &= ~TIMER0_COMPARE_MATCH_B_INTERRUPT;

278 }

279 

285 inline void TIMER0_EnableAllInterrupt()

286 {

287  TIMSK0 |= TIMER0_COMPARE_MATCH_B_INTERRUPT | TIMER0_COMPARE_MATCH_A_INTERRUPT | TIMER0_OVERFLOW_INTERRUPT;

288 }

289 

295 inline void TIMER0_DisableAllInterrupt()

296 {

297  TIMSK0 &= ~(TIMER0_COMPARE_MATCH_B_INTERRUPT | TIMER0_COMPARE_MATCH_A_INTERRUPT | TIMER0_OVERFLOW_INTERRUPT);

298 }

299 

306 void TIMER0_Init(TIMER0_ConfigData Data)

307 {

308  TCCR0A = Data.OutputCompareModePinA | Data.OutputCompareModePinB | Data.TimerMode;

309  TCCR0B = TIMER0_PWM_TOP_0xFF | Data.Prescaler;

310  TCNT0 = Data.TimerCounterRegister;

311  OCR0A = Data.OutputCompareRegisterA;

312  OCR0B = Data.OutputCompareRegisterB;

313 

314  uint32_t TIMER0_InputClockFrequency = 0;

315 

316  /* Computes the Input Clock Frequency for Timer-0 */

317  if(Data.Prescaler == TIMER0_PRESCALER_1)

318  {

319  TIMER0_InputClockFrequency = F_CPU / 1;

320  }

321  else if(Data.Prescaler == TIMER0_PRESCALER_8)

322  {

323  TIMER0_InputClockFrequency = F_CPU / 8;

324  }

325  else

326  {

327  TIMER0_InputClockFrequency = F_CPU / (2 ^ Data.Prescaler);

328  }

329 

330  /* Computes the System Tick Frequency for Timer-0 */

331  if (Data.SystemTickState == ENABLE)

332  {

333  if(Data.TimerMode == (TIMER0_MODE_NORMAL))

334  {

335  TIMER0_SystemTickFrequency = 2 * TIMER0_InputClockFrequency / 512; /* Computes the Tick Count Frequency for Timer-0 in NORMAL MODE */

336  TIMER0_SystemTickTimePeriodUs = (uint8_t)(F_1Mhz / TIMER0_SystemTickFrequency);

337  TIMER0_SystemTickPerMs = (uint8_t)(TIMER0_SystemTickFrequency / F_1kHz);

338  TIMER0_EnableOverflowInterrupt();

339  }

340  else if(Data.TimerMode == (TIMER0_MODE_CTC))

341  {

342  TIMER0_SystemTickFrequency = F_100kHz; /* Sets the Tick Count Frequency for Timer-0 in CTC MODE */

343  OCR0A = (uint8_t)(TIMER0_InputClockFrequency / TIMER0_SystemTickFrequency) - 1; /* OCR0A Count Calculation Formula for Timer-0 in CTC Mode*/

344  TIMER0_SystemTickTimePeriodUs = (uint8_t)(F_1Mhz / TIMER0_SystemTickFrequency);

345  TIMER0_SystemTickPerMs = (uint8_t)(TIMER0_SystemTickFrequency / F_1kHz);

346  TIMER0_EnableCompareMatchAInterrupt();

347  }

348  else if(Data.TimerMode == (TIMER0_MODE_FAST_PWM))

349  {

350  TIMER0_SystemTickFrequency = TIMER0_InputClockFrequency / 256; /* Computes the Tick Count Frequency for Timer-0 in FAST PWM MODE */

351  TIMER0_SystemTickTimePeriodUs = (uint8_t)(F_1Mhz / TIMER0_SystemTickFrequency);

352  TIMER0_SystemTickPerMs = (uint8_t)(TIMER0_SystemTickFrequency / F_1kHz);

353  TIMER0_EnableOverflowInterrupt();

354  }

355  else if(Data.TimerMode == (TIMER0_MODE_PHASE_CORRECT_PWM))

356  {

357  TIMER0_SystemTickFrequency = TIMER0_InputClockFrequency / 510; /* Computes the Tick Count Frequency for Timer-0 in PHASE CORRECT PWM MODE */

358  TIMER0_SystemTickTimePeriodUs = (uint8_t)(F_1Mhz / TIMER0_SystemTickFrequency);

359  TIMER0_SystemTickPerMs = (uint8_t)(TIMER0_SystemTickFrequency / F_1kHz);

360  TIMER0_EnableOverflowInterrupt();

361  }

362  }

363 

364  if (Data.OutputCompareModePinA != (TIMER0_OC0A_NO_OUTPUT))

365  {

366  DDRD |= (1<<5);

367 

368  }

369 

370  if (Data.OutputCompareModePinB != (TIMER0_OC0B_NO_OUTPUT))

371  {

372 

373  DDRD |= (1<<6);

374  }

375 

376  /* Enables Global Interrupts */

377  sei();

378 }

379 

385 void TIMER0_DeInit()

386 {

387  TCCR0B = 0x00;

388  TCCR0A = 0x00;

389  TCNT0 = 0x00;

390  OCR0A = 0x00;

391  OCR0B = 0x00;

392  TIMER0_DisableAllInterrupt();

393 }

394 

401 inline void TIMER0_SetOCR0A(uint8_t Value)

402 {

403  OCR0A = Value;

404 }

405 

412 inline void TIMER0_SetOCR0B(uint8_t Value)

413 {

414  OCR0B = Value;

415 }

416 

422 uint32_t TIMER0_GetSystemTick()

423 {

424  return TIMER0_SystemTickCount;

425 }

426 

432 uint64_t TIMER0_GetSystemTimeUs()

433 {

434  return (uint64_t)(TIMER0_SystemTickCount * TIMER0_SystemTickTimePeriodUs);

435 }

436 

442 uint32_t TIMER0_GetSystemTimeMs()

443 {

444  return (uint32_t)((TIMER0_SystemTickCount * F_1kHz) / TIMER0_SystemTickFrequency);

445 }

446 

453 uint32_t TIMER0_TickToUs(uint32_t Tick)

454 {

455  return (uint32_t)(Tick * TIMER0_SystemTickTimePeriodUs);

456 }

457 

464 uint16_t TIMER0_UsToTick(uint16_t Time)

465 {

466  return (uint16_t)(Time / TIMER0_SystemTickTimePeriodUs);

467 }

468 

475 void TIMER0_DelayTick(uint16_t Tick)

476 {

477  TIMER0_DisableAllInterrupt();

478  uint32_t LocalTick = TIMER0_SystemTickCount + Tick;

479  if((TCCR0A & (TIMER0_MODE_MASK)) == TIMER0_MODE_CTC)

480  {

481  TIMER0_EnableCompareMatchAInterrupt();

482  }

483  else

484  {

485  TIMER0_EnableOverflowInterrupt();

486  }

487  while(TIMER0_SystemTickCount != LocalTick);

488 }

489 

497 void TIMER0_DelayUs(uint16_t Time)

498 {

499  TIMER0_DisableAllInterrupt();

500  uint32_t Count = Time / TIMER0_SystemTickTimePeriodUs;

501  uint32_t LocalTime = TIMER0_SystemTickCount + Count;

502  if((TCCR0A & (TIMER0_MODE_MASK)) == TIMER0_MODE_CTC)

503  {

504  TIMER0_EnableCompareMatchAInterrupt();

505  }

506  else

507  {

508  TIMER0_EnableOverflowInterrupt();

509  }

510  while(TIMER0_SystemTickCount != LocalTime);

511 }

512 

519 void TIMER0_DelayMs(uint16_t Time)

520 {

521  TIMER0_DisableAllInterrupt();

522  uint32_t Count = (uint32_t)Time * (uint32_t)TIMER0_SystemTickPerMs;

523  uint32_t LocalTime = TIMER0_SystemTickCount + Count;

524  if((TCCR0A & (TIMER0_MODE_MASK)) == TIMER0_MODE_CTC)

525  {

526  TIMER0_EnableCompareMatchAInterrupt();

527  }

528  else

529  {

530  TIMER0_EnableOverflowInterrupt();

531  }

532  while(TIMER0_SystemTickCount != LocalTime);

533 }

534 

540 ISR(TIMER0_OVF_vect) // 1.375us

541 {

542  TIMER0_SystemTickCount++;

543 }

544 

550 ISR(TIMER0_COMPA_vect) // 1.5 + 1.41us + 1.41 Takes Total 4.33uS

551 {

552  TIMER0_SystemTickCount++;

553 }

554 

560 ISR(TIMER0_COMPB_vect)

561 {

562 

563 }

564 

565 #endif /* AVR_TIMER0_H_ */