/* Teensyduino Core Library * http://www.pjrc.com/teensy/ * Copyright (c) 2013 PJRC.COM, LLC. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * 1. The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * 2. If the Software is incorporated into a build system that allows * selection among a list of target devices, then similar target * devices manufactured by PJRC.COM must be included in the list of * target devices and selectable in the same manner. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "core_pins.h" #include "pins_arduino.h" #include "HardwareSerial.h" #if 0 // moved to pins_arduino.h struct digital_pin_bitband_and_config_table_struct { volatile uint32_t *reg; volatile uint32_t *config; }; const struct digital_pin_bitband_and_config_table_struct digital_pin_to_info_PGM[]; // compatibility macros #define digitalPinToPort(pin) (pin) #define digitalPinToBitMask(pin) (1) #define portOutputRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 0)) #define portSetRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 32)) #define portClearRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 64)) #define portToggleRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 96)) #define portInputRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 128)) #define portModeRegister(pin) ((volatile uint8_t *)(digital_pin_to_info_PGM[(pin)].reg + 160)) #define portConfigRegister(pin) ((volatile uint32_t *)(digital_pin_to_info_PGM[(pin)].config)) #endif //#define digitalPinToTimer(P) ( pgm_read_byte( digital_pin_to_timer_PGM + (P) ) ) //#define analogInPinToBit(P) (P) #define GPIO_BITBAND_ADDR(reg, bit) (((uint32_t)&(reg) - 0x40000000) * 32 + (bit) * 4 + 0x42000000) #define GPIO_BITBAND_PTR(reg, bit) ((uint32_t *)GPIO_BITBAND_ADDR((reg), (bit))) //#define GPIO_SET_BIT(reg, bit) (*GPIO_BITBAND_PTR((reg), (bit)) = 1) //#define GPIO_CLR_BIT(reg, bit) (*GPIO_BITBAND_PTR((reg), (bit)) = 0) const struct digital_pin_bitband_and_config_table_struct digital_pin_to_info_PGM[] = { {GPIO_BITBAND_PTR(CORE_PIN0_PORTREG, CORE_PIN0_BIT), &CORE_PIN0_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN1_PORTREG, CORE_PIN1_BIT), &CORE_PIN1_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN2_PORTREG, CORE_PIN2_BIT), &CORE_PIN2_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN3_PORTREG, CORE_PIN3_BIT), &CORE_PIN3_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN4_PORTREG, CORE_PIN4_BIT), &CORE_PIN4_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN5_PORTREG, CORE_PIN5_BIT), &CORE_PIN5_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN6_PORTREG, CORE_PIN6_BIT), &CORE_PIN6_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN7_PORTREG, CORE_PIN7_BIT), &CORE_PIN7_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN8_PORTREG, CORE_PIN8_BIT), &CORE_PIN8_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN9_PORTREG, CORE_PIN9_BIT), &CORE_PIN9_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN10_PORTREG, CORE_PIN10_BIT), &CORE_PIN10_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN11_PORTREG, CORE_PIN11_BIT), &CORE_PIN11_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN12_PORTREG, CORE_PIN12_BIT), &CORE_PIN12_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN13_PORTREG, CORE_PIN13_BIT), &CORE_PIN13_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN14_PORTREG, CORE_PIN14_BIT), &CORE_PIN14_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN15_PORTREG, CORE_PIN15_BIT), &CORE_PIN15_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN16_PORTREG, CORE_PIN16_BIT), &CORE_PIN16_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN17_PORTREG, CORE_PIN17_BIT), &CORE_PIN17_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN18_PORTREG, CORE_PIN18_BIT), &CORE_PIN18_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN19_PORTREG, CORE_PIN19_BIT), &CORE_PIN19_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN20_PORTREG, CORE_PIN20_BIT), &CORE_PIN20_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN21_PORTREG, CORE_PIN21_BIT), &CORE_PIN21_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN22_PORTREG, CORE_PIN22_BIT), &CORE_PIN22_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN23_PORTREG, CORE_PIN23_BIT), &CORE_PIN23_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN24_PORTREG, CORE_PIN24_BIT), &CORE_PIN24_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN25_PORTREG, CORE_PIN25_BIT), &CORE_PIN25_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN26_PORTREG, CORE_PIN26_BIT), &CORE_PIN26_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN27_PORTREG, CORE_PIN27_BIT), &CORE_PIN27_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN28_PORTREG, CORE_PIN28_BIT), &CORE_PIN28_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN29_PORTREG, CORE_PIN29_BIT), &CORE_PIN29_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN30_PORTREG, CORE_PIN30_BIT), &CORE_PIN30_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN31_PORTREG, CORE_PIN31_BIT), &CORE_PIN31_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN32_PORTREG, CORE_PIN32_BIT), &CORE_PIN32_CONFIG}, {GPIO_BITBAND_PTR(CORE_PIN33_PORTREG, CORE_PIN33_BIT), &CORE_PIN33_CONFIG} }; typedef void (*voidFuncPtr)(void); volatile static voidFuncPtr intFunc[CORE_NUM_DIGITAL]; void init_pin_interrupts(void) { //SIM_SCGC5 = 0x00043F82; // clocks active to all GPIO NVIC_ENABLE_IRQ(IRQ_PORTA); NVIC_ENABLE_IRQ(IRQ_PORTB); NVIC_ENABLE_IRQ(IRQ_PORTC); NVIC_ENABLE_IRQ(IRQ_PORTD); NVIC_ENABLE_IRQ(IRQ_PORTE); // TODO: maybe these should be set to a lower priority // so if the user puts lots of slow code on attachInterrupt // fast interrupts will still be serviced quickly? } void attachInterrupt(uint8_t pin, void (*function)(void), int mode) { volatile uint32_t *config; uint32_t cfg, mask; if (pin >= CORE_NUM_DIGITAL) return; switch (mode) { case CHANGE: mask = 0x0B; break; case RISING: mask = 0x09; break; case FALLING: mask = 0x0A; break; case LOW: mask = 0x08; break; case HIGH: mask = 0x0C; break; default: return; } mask = (mask << 16) | 0x01000000; config = portConfigRegister(pin); __disable_irq(); cfg = *config; cfg &= ~0x000F0000; // disable any previous interrupt *config = cfg; intFunc[pin] = function; // set the function pointer cfg |= mask; *config = cfg; // enable the new interrupt __enable_irq(); } void detachInterrupt(uint8_t pin) { volatile uint32_t *config; config = portConfigRegister(pin); __disable_irq(); *config = ((*config & ~0x000F0000) | 0x01000000); intFunc[pin] = NULL; __enable_irq(); } void porta_isr(void) { uint32_t isfr = PORTA_ISFR; PORTA_ISFR = isfr; if ((isfr & CORE_PIN3_BITMASK) && intFunc[3]) intFunc[3](); if ((isfr & CORE_PIN4_BITMASK) && intFunc[4]) intFunc[4](); if ((isfr & CORE_PIN24_BITMASK) && intFunc[24]) intFunc[24](); if ((isfr & CORE_PIN33_BITMASK) && intFunc[33]) intFunc[33](); } void portb_isr(void) { uint32_t isfr = PORTB_ISFR; PORTB_ISFR = isfr; if ((isfr & CORE_PIN0_BITMASK) && intFunc[0]) intFunc[0](); if ((isfr & CORE_PIN1_BITMASK) && intFunc[1]) intFunc[1](); if ((isfr & CORE_PIN16_BITMASK) && intFunc[16]) intFunc[16](); if ((isfr & CORE_PIN17_BITMASK) && intFunc[17]) intFunc[17](); if ((isfr & CORE_PIN18_BITMASK) && intFunc[18]) intFunc[18](); if ((isfr & CORE_PIN19_BITMASK) && intFunc[19]) intFunc[19](); if ((isfr & CORE_PIN25_BITMASK) && intFunc[25]) intFunc[25](); if ((isfr & CORE_PIN32_BITMASK) && intFunc[32]) intFunc[32](); } void portc_isr(void) { // TODO: these are inefficent. Use CLZ somehow.... uint32_t isfr = PORTC_ISFR; PORTC_ISFR = isfr; if ((isfr & CORE_PIN9_BITMASK) && intFunc[9]) intFunc[9](); if ((isfr & CORE_PIN10_BITMASK) && intFunc[10]) intFunc[10](); if ((isfr & CORE_PIN11_BITMASK) && intFunc[11]) intFunc[11](); if ((isfr & CORE_PIN12_BITMASK) && intFunc[12]) intFunc[12](); if ((isfr & CORE_PIN13_BITMASK) && intFunc[13]) intFunc[13](); if ((isfr & CORE_PIN15_BITMASK) && intFunc[15]) intFunc[15](); if ((isfr & CORE_PIN22_BITMASK) && intFunc[22]) intFunc[22](); if ((isfr & CORE_PIN23_BITMASK) && intFunc[23]) intFunc[23](); if ((isfr & CORE_PIN27_BITMASK) && intFunc[27]) intFunc[27](); if ((isfr & CORE_PIN28_BITMASK) && intFunc[28]) intFunc[28](); if ((isfr & CORE_PIN29_BITMASK) && intFunc[29]) intFunc[29](); if ((isfr & CORE_PIN30_BITMASK) && intFunc[30]) intFunc[30](); } void portd_isr(void) { uint32_t isfr = PORTD_ISFR; PORTD_ISFR = isfr; if ((isfr & CORE_PIN2_BITMASK) && intFunc[2]) intFunc[2](); if ((isfr & CORE_PIN5_BITMASK) && intFunc[5]) intFunc[5](); if ((isfr & CORE_PIN6_BITMASK) && intFunc[6]) intFunc[6](); if ((isfr & CORE_PIN7_BITMASK) && intFunc[7]) intFunc[7](); if ((isfr & CORE_PIN8_BITMASK) && intFunc[8]) intFunc[8](); if ((isfr & CORE_PIN14_BITMASK) && intFunc[14]) intFunc[14](); if ((isfr & CORE_PIN20_BITMASK) && intFunc[20]) intFunc[20](); if ((isfr & CORE_PIN21_BITMASK) && intFunc[21]) intFunc[21](); } void porte_isr(void) { uint32_t isfr = PORTE_ISFR; PORTE_ISFR = isfr; if ((isfr & CORE_PIN26_BITMASK) && intFunc[26]) intFunc[26](); if ((isfr & CORE_PIN31_BITMASK) && intFunc[31]) intFunc[31](); } unsigned long rtc_get(void) { return RTC_TSR; } void rtc_set(unsigned long t) { RTC_SR = 0; RTC_TPR = 0; RTC_TSR = t; RTC_SR = RTC_SR_TCE; } // adjust is the amount of crystal error to compensate, 1 = 0.1192 ppm // For example, adjust = -100 is slows the clock by 11.92 ppm // void rtc_compensate(int adjust) { uint32_t comp, interval, tcr; // This simple approach tries to maximize the interval. // Perhaps minimizing TCR would be better, so the // compensation is distributed more evenly across // many seconds, rather than saving it all up and then // altering one second up to +/- 0.38% if (adjust >= 0) { comp = adjust; interval = 256; while (1) { tcr = comp * interval; if (tcr < 128*256) break; if (--interval == 1) break; } tcr = tcr >> 8; } else { comp = -adjust; interval = 256; while (1) { tcr = comp * interval; if (tcr < 129*256) break; if (--interval == 1) break; } tcr = tcr >> 8; tcr = 256 - tcr; } RTC_TCR = ((interval - 1) << 8) | tcr; } #if 0 // TODO: build system should define this // so RTC is automatically initialized to approx correct time // at least when the program begins running right after upload #ifndef TIME_T #define TIME_T 1350160272 #endif void init_rtc(void) { serial_print("init_rtc\n"); //SIM_SCGC6 |= SIM_SCGC6_RTC; // enable the RTC crystal oscillator, for approx 12pf crystal if (!(RTC_CR & RTC_CR_OSCE)) { serial_print("start RTC oscillator\n"); RTC_SR = 0; RTC_CR = RTC_CR_SC16P | RTC_CR_SC4P | RTC_CR_OSCE; } // should wait for crystal to stabilize..... serial_print("SR="); serial_phex32(RTC_SR); serial_print("\n"); serial_print("CR="); serial_phex32(RTC_CR); serial_print("\n"); serial_print("TSR="); serial_phex32(RTC_TSR); serial_print("\n"); serial_print("TCR="); serial_phex32(RTC_TCR); serial_print("\n"); if (RTC_SR & RTC_SR_TIF) { // enable the RTC RTC_SR = 0; RTC_TPR = 0; RTC_TSR = TIME_T; RTC_SR = RTC_SR_TCE; } } #endif extern void usb_init(void); // create a default PWM at the same 488.28 Hz as Arduino Uno #if F_BUS == 48000000 #define DEFAULT_FTM_MOD (49152 - 1) #define DEFAULT_FTM_PRESCALE 1 #else #define DEFAULT_FTM_MOD (49152 - 1) #define DEFAULT_FTM_PRESCALE 0 #endif //void init_pins(void) void _init_Teensyduino_internal_(void) { init_pin_interrupts(); //SIM_SCGC6 |= SIM_SCGC6_FTM0; // TODO: use bitband for atomic read-mod-write //SIM_SCGC6 |= SIM_SCGC6_FTM1; FTM0_CNT = 0; FTM0_MOD = DEFAULT_FTM_MOD; FTM0_C0SC = 0x28; // MSnB:MSnA = 10, ELSnB:ELSnA = 10 FTM0_C1SC = 0x28; FTM0_C2SC = 0x28; FTM0_C3SC = 0x28; FTM0_C4SC = 0x28; FTM0_C5SC = 0x28; FTM0_C6SC = 0x28; FTM0_C7SC = 0x28; FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS(DEFAULT_FTM_PRESCALE); FTM1_CNT = 0; FTM1_MOD = DEFAULT_FTM_MOD; FTM1_C0SC = 0x28; FTM1_C1SC = 0x28; FTM1_SC = FTM_SC_CLKS(1) | FTM_SC_PS(DEFAULT_FTM_PRESCALE); analog_init(); //delay(100); // TODO: this is not necessary, right? usb_init(); } // SOPT4 is SIM select clocks? // FTM is clocked by the bus clock, either 24 or 48 MHz // input capture can be FTM1_CH0, CMP0 or CMP1 or USB start of frame // 24 MHz with reload 49152 to match Arduino's speed = 488.28125 Hz static uint8_t analog_write_res = 8; void analogWrite(uint8_t pin, int val) { uint32_t cval, max; max = 1 << analog_write_res; if (val <= 0) { digitalWrite(pin, LOW); pinMode(pin, OUTPUT); // TODO: implement OUTPUT_LOW return; } else if (val >= max) { digitalWrite(pin, HIGH); pinMode(pin, OUTPUT); // TODO: implement OUTPUT_HIGH return; } //serial_print("analogWrite\n"); //serial_print("val = "); //serial_phex32(val); //serial_print("\n"); //serial_print("analog_write_res = "); //serial_phex(analog_write_res); //serial_print("\n"); if (pin == 3 || pin == 4) { cval = ((uint32_t)val * (uint32_t)(FTM1_MOD + 1)) >> analog_write_res; //serial_print("FTM1_MOD = "); //serial_phex32(FTM1_MOD); //serial_print("\n"); } else { cval = ((uint32_t)val * (uint32_t)(FTM0_MOD + 1)) >> analog_write_res; //serial_print("FTM0_MOD = "); //serial_phex32(FTM0_MOD); //serial_print("\n"); } //serial_print("cval = "); //serial_phex32(cval); //serial_print("\n"); switch (pin) { case 3: // PTA12, FTM1_CH0 FTM1_C0V = cval; CORE_PIN3_CONFIG = PORT_PCR_MUX(3) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 4: // PTA13, FTM1_CH1 FTM1_C1V = cval; CORE_PIN4_CONFIG = PORT_PCR_MUX(3) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 5: // PTD7, FTM0_CH7 FTM0_C7V = cval; CORE_PIN5_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 6: // PTD4, FTM0_CH4 FTM0_C4V = cval; CORE_PIN6_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 9: // PTC3, FTM0_CH2 FTM0_C2V = cval; CORE_PIN9_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 10: // PTC4, FTM0_CH3 FTM0_C3V = cval; CORE_PIN10_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 20: // PTD5, FTM0_CH5 FTM0_C5V = cval; CORE_PIN20_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 21: // PTD6, FTM0_CH6 FTM0_C6V = cval; CORE_PIN21_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 22: // PTC1, FTM0_CH0 FTM0_C0V = cval; CORE_PIN22_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; case 23: // PTC2, FTM0_CH1 FTM0_C1V = cval; CORE_PIN23_CONFIG = PORT_PCR_MUX(4) | PORT_PCR_DSE | PORT_PCR_SRE; break; default: digitalWrite(pin, (val > 127) ? HIGH : LOW); pinMode(pin, OUTPUT); } } void analogWriteRes(uint32_t bits) { if (bits < 1) { bits = 1; } else if (bits > 16) { bits = 16; } analog_write_res = bits; } void analogWriteFrequency(uint8_t pin, uint32_t frequency) { uint32_t minfreq, prescale, mod; //serial_print("analogWriteFrequency: pin = "); //serial_phex(pin); //serial_print(", freq = "); //serial_phex32(frequency); //serial_print("\n"); for (prescale = 0; prescale < 7; prescale++) { minfreq = (F_BUS >> 16) >> prescale; if (frequency > minfreq) break; } //serial_print("F_BUS = "); //serial_phex32(F_BUS >> prescale); //serial_print("\n"); //serial_print("prescale = "); //serial_phex(prescale); //serial_print("\n"); //mod = ((F_BUS >> prescale) / frequency) - 1; mod = (((F_BUS >> prescale) + (frequency >> 1)) / frequency) - 1; if (mod > 65535) mod = 65535; //serial_print("mod = "); //serial_phex32(mod); //serial_print("\n"); if (pin == 3 || pin == 4) { FTM1_SC = 0; FTM1_CNT = 0; FTM1_MOD = mod; FTM1_SC = FTM_SC_CLKS(1) | FTM_SC_PS(prescale); } else if (pin == 5 || pin == 6 || pin == 9 || pin == 10 || (pin >= 20 && pin <= 23)) { FTM0_SC = 0; FTM0_CNT = 0; FTM0_MOD = mod; FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS(prescale); } } // TODO: startup code needs to initialize all pins to GPIO mode, input by default void digitalWrite(uint8_t pin, uint8_t val) { if (pin >= CORE_NUM_DIGITAL) return; if (*portModeRegister(pin)) { if (val) { *portSetRegister(pin) = 1; } else { *portClearRegister(pin) = 1; } } else { volatile uint32_t *config = portConfigRegister(pin); if (val) { // TODO use bitband for atomic read-mod-write *config |= (PORT_PCR_PE | PORT_PCR_PS); //*config = PORT_PCR_MUX(1) | PORT_PCR_PE | PORT_PCR_PS; } else { // TODO use bitband for atomic read-mod-write *config &= ~(PORT_PCR_PE); //*config = PORT_PCR_MUX(1); } } } uint8_t digitalRead(uint8_t pin) { if (pin >= CORE_NUM_DIGITAL) return 0; return *portInputRegister(pin); } void pinMode(uint8_t pin, uint8_t mode) { volatile uint32_t *config; if (pin >= CORE_NUM_DIGITAL) return; config = portConfigRegister(pin); if (mode == OUTPUT) { *portModeRegister(pin) = 1; *config = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1); } else { *portModeRegister(pin) = 0; if (mode == INPUT) { *config = PORT_PCR_MUX(1); } else { *config = PORT_PCR_MUX(1) | PORT_PCR_PE | PORT_PCR_PS; // pullup } } } void _shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t value) { if (bitOrder == LSBFIRST) { shiftOut_lsbFirst(dataPin, clockPin, value); } else { shiftOut_msbFirst(dataPin, clockPin, value); } } void shiftOut_lsbFirst(uint8_t dataPin, uint8_t clockPin, uint8_t value) { uint8_t mask; for (mask=0x01; mask; mask <<= 1) { digitalWrite(dataPin, value & mask); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); } } void shiftOut_msbFirst(uint8_t dataPin, uint8_t clockPin, uint8_t value) { uint8_t mask; for (mask=0x80; mask; mask >>= 1) { digitalWrite(dataPin, value & mask); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); } } uint8_t _shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) { if (bitOrder == LSBFIRST) { return shiftIn_lsbFirst(dataPin, clockPin); } else { return shiftIn_msbFirst(dataPin, clockPin); } } uint8_t shiftIn_lsbFirst(uint8_t dataPin, uint8_t clockPin) { uint8_t mask, value=0; for (mask=0x01; mask; mask <<= 1) { digitalWrite(clockPin, HIGH); if (digitalRead(dataPin)) value |= mask; digitalWrite(clockPin, LOW); } return value; } uint8_t shiftIn_msbFirst(uint8_t dataPin, uint8_t clockPin) { uint8_t mask, value=0; for (mask=0x80; mask; mask >>= 1) { digitalWrite(clockPin, HIGH); if (digitalRead(dataPin)) value |= mask; digitalWrite(clockPin, LOW); } return value; } // the systick interrupt is supposed to increment this at 1 kHz rate volatile uint32_t systick_millis_count = 0; //uint32_t systick_current, systick_count, systick_istatus; // testing only uint32_t micros(void) { uint32_t count, current, istatus; __disable_irq(); current = SYST_CVR; count = systick_millis_count; istatus = SCB_ICSR; // bit 26 indicates if systick exception pending __enable_irq(); //systick_current = current; //systick_count = count; //systick_istatus = istatus & SCB_ICSR_PENDSTSET ? 1 : 0; if ((istatus & SCB_ICSR_PENDSTSET) && current > 50) count++; current = ((F_CPU / 1000) - 1) - current; return count * 1000 + current / (F_CPU / 1000000); } void delay(uint32_t ms) { uint32_t start = micros(); if (ms > 0) { while (1) { if ((micros() - start) >= 1000) { ms--; if (ms == 0) return; start += 1000; } yield(); } } } #if F_CPU == 96000000 #define PULSEIN_LOOPS_PER_USEC 14 #elif F_CPU == 48000000 #define PULSEIN_LOOPS_PER_USEC 7 #elif F_CPU == 24000000 #define PULSEIN_LOOPS_PER_USEC 4 #endif uint32_t pulseIn_high(volatile uint8_t *reg, uint32_t timeout) { uint32_t timeout_count = timeout * PULSEIN_LOOPS_PER_USEC; uint32_t usec_start, usec_stop; // wait for any previous pulse to end while (*reg) { if (--timeout_count == 0) return 0; } // wait for the pulse to start while (!*reg) { if (--timeout_count == 0) return 0; } usec_start = micros(); // wait for the pulse to stop while (*reg) { if (--timeout_count == 0) return 0; } usec_stop = micros(); return usec_stop - usec_start; } uint32_t pulseIn_low(volatile uint8_t *reg, uint32_t timeout) { uint32_t timeout_count = timeout * PULSEIN_LOOPS_PER_USEC; uint32_t usec_start, usec_stop; // wait for any previous pulse to end while (!*reg) { if (--timeout_count == 0) return 0; } // wait for the pulse to start while (*reg) { if (--timeout_count == 0) return 0; } usec_start = micros(); // wait for the pulse to stop while (!*reg) { if (--timeout_count == 0) return 0; } usec_stop = micros(); return usec_stop - usec_start; } // TODO: an inline version should handle the common case where state is const uint32_t pulseIn(uint8_t pin, uint8_t state, uint32_t timeout) { if (pin >= CORE_NUM_DIGITAL) return 0; if (state) return pulseIn_high(portInputRegister(pin), timeout); return pulseIn_low(portInputRegister(pin), timeout);; }