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Diffstat (limited to 'arch/attiny85.c')
| -rw-r--r-- | arch/attiny85.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/arch/attiny85.c b/arch/attiny85.c new file mode 100644 index 0000000..9e298cc --- /dev/null +++ b/arch/attiny85.c @@ -0,0 +1,225 @@ +// arch/attiny85.c: attiny85 support functions +// Copyright (C) 2014-2023 Selene ToyKeeper +// SPDX-License-Identifier: GPL-3.0-or-later +#pragma once + +#include "arch/attiny85.h" + +////////// clock speed / delay stuff ////////// + +///// clock dividers + +////////// default hw_setup() ////////// + +// FIXME: fsm/main should call hwdef_setup(), not hw_setup, +// and this function should be hwdef_setup +#ifdef USE_GENERIC_HWDEF_SETUP +static inline void hwdef_setup() { + // configure PWM channels + #if PWM_CHANNELS >= 1 + DDRB |= (1 << PWM1_PIN); + TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...) + TCCR0A = PHASE; + #if (PWM1_PIN == PB4) // Second PWM counter is ... weird + TCCR1 = _BV (CS10); + GTCCR = _BV (COM1B1) | _BV (PWM1B); + OCR1C = 255; // Set ceiling value to maximum + #endif + #endif + // tint ramping needs second channel enabled, + // despite PWM_CHANNELS being only 1 + #if (PWM_CHANNELS >= 2) || defined(USE_TINT_RAMPING) + DDRB |= (1 << PWM2_PIN); + #if (PWM2_PIN == PB4) // Second PWM counter is ... weird + TCCR1 = _BV (CS10); + GTCCR = _BV (COM1B1) | _BV (PWM1B); + OCR1C = 255; // Set ceiling value to maximum + #endif + #endif + #if PWM_CHANNELS >= 3 + DDRB |= (1 << PWM3_PIN); + #if (PWM3_PIN == PB4) // Second PWM counter is ... weird + TCCR1 = _BV (CS10); + GTCCR = _BV (COM1B1) | _BV (PWM1B); + OCR1C = 255; // Set ceiling value to maximum + #endif + #endif + #if PWM_CHANNELS >= 4 + // 4th PWM channel is ... not actually supported in hardware :( + DDRB |= (1 << PWM4_PIN); + //OCR1C = 255; // Set ceiling value to maximum + TCCR1 = 1<<CTC1 | 1<<PWM1A | 3<<COM1A0 | 2<<CS10; + GTCCR = (2<<COM1B0) | (1<<PWM1B); + // set up an interrupt to control PWM4 pin + TIMSK |= (1<<OCIE1A) | (1<<TOIE1); + #endif + + // configure e-switch + PORTB = (1 << SWITCH_PIN); // e-switch is the only input + PCMSK = (1 << SWITCH_PIN); // pin change interrupt uses this pin +} +#endif // #ifdef USE_GENERIC_HWDEF_SETUP + + +////////// ADC voltage / temperature ////////// + +inline void mcu_set_admux_therm() { + // put the ADC in temperature mode + ADMUX = ADMUX_THERM | (1 << ADLAR); +} + +inline void mcu_set_admux_voltage() { + // put the ADC in battery voltage measurement mode + // TODO: avr datasheet references + #ifdef USE_VOLTAGE_DIVIDER // 1.1V / pin7 + ADMUX = ADMUX_VOLTAGE_DIVIDER | (1 << ADLAR); + // disable digital input on divider pin to reduce power consumption + VOLTAGE_ADC_DIDR |= (1 << VOLTAGE_ADC); + #else // VCC / 1.1V reference + ADMUX = ADMUX_VCC | (1 << ADLAR); + // disable digital input on VCC pin to reduce power consumption + //VOLTAGE_ADC_DIDR |= (1 << VOLTAGE_ADC); // FIXME: unsure how to handle for VCC pin + #endif +} + +inline void mcu_adc_sleep_mode() { + set_sleep_mode(SLEEP_MODE_ADC); +} + +inline void mcu_adc_start_measurement() { + ADCSRA = (1 << ADEN) // enable + | (1 << ADSC) // start + | (1 << ADATE) // auto-retrigger + | (1 << ADIE) // interrupt enable + | ADC_PRSCL; // prescale +} + +inline void mcu_adc_off() { + ADCSRA &= ~(1<<ADEN); //ADC off +} + +// left-adjusted mode: +inline uint16_t mcu_adc_result() { return ADC; } + +inline uint8_t mcu_vdd_raw2cooked(uint16_t measurement) { + // In : 65535 * 1.1 / Vbat + // Out: uint8_t: Vbat * 40 + // 1.1 = ADC Vref + // 1024 = how much ADC resolution we're using (10 bits) + // (12 bits available, but it costs an extra 84 bytes of ROM to calculate) + uint8_t vbat40 = (uint16_t)(40 * 1.1 * 1024) / (measurement >> 6); + return vbat40; +} + + +#ifdef USE_VOLTAGE_DIVIDER +inline uint8_t mcu_vdivider_raw2cooked(uint16_t measurement) { + // In : 4095 * Vdiv / 1.1V + // Out: uint8_t: Vbat * 40 + // Vdiv = Vbat / 4.3 (typically) + // 1.1 = ADC Vref + const uint16_t adc_per_volt = + (((uint16_t)ADC_44 << 4) - ((uint16_t)ADC_22 << 4)) + / (4 * (44-22)); + uint8_t result = measurement / adc_per_volt; + return result; +} +#endif + +inline uint16_t mcu_temp_raw2cooked(uint16_t measurement) { + // convert raw ADC values to calibrated temperature + // In: ADC raw temperature (16-bit, or left-aligned) + // Out: Kelvin << 6 + // Precision: 1/64th Kelvin (but noisy) + // attiny1634 datasheet section 19.12 + // nothing to do; input value is already "cooked" + return measurement; +} + +inline uint8_t mcu_adc_lsb() { + // left-adjusted mode: + return (ADCL >> 6) + (ADCH << 2); +} + + +////////// WDT ////////// + +inline void mcu_wdt_active() { + // interrupt every 16ms + //cli(); // Disable interrupts + wdt_reset(); // Reset the WDT + WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence + WDTCR = (1<<WDIE); // Enable interrupt every 16ms + //sei(); // Enable interrupts +} + +inline void mcu_wdt_standby() { + // interrupt slower + //cli(); // Disable interrupts + wdt_reset(); // Reset the WDT + WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence + WDTCR = (1<<WDIE) | STANDBY_TICK_SPEED; // Enable interrupt every so often + //sei(); // Enable interrupts +} + +inline void mcu_wdt_stop() { + //cli(); // Disable interrupts + wdt_reset(); // Reset the WDT + MCUSR &= ~(1<<WDRF); // Clear Watchdog reset flag + WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence + WDTCR = 0x00; // Disable WDT + //sei(); // Enable interrupts +} + + +////////// PCINT - pin change interrupt (e-switch) ////////// + +inline void mcu_pcint_on() { + // enable pin change interrupt + GIMSK |= (1 << PCIE); + // only pay attention to the e-switch pin + #if 0 // this is redundant; was already done in main() + PCMSK = (1 << SWITCH_PCINT); + #endif + // set bits 1:0 to 0b01 (interrupt on rising *and* falling edge) (default) + // MCUCR &= 0b11111101; MCUCR |= 0b00000001; +} + +inline void mcu_pcint_off() { + // disable all pin-change interrupts + GIMSK &= ~(1 << PCIE); +} + + +////////// misc ////////// + +void reboot() { + // put the WDT in hard reset mode, then trigger it + cli(); + WDTCR = 0xD8 | WDTO_15MS; + sei(); + wdt_reset(); + while (1) {} +} + +inline void prevent_reboot_loop() { + // prevent WDT from rebooting MCU again + MCUSR &= ~(1<<WDRF); // reset status flag + wdt_disable(); +} + + +#if 0 // example for one way of creating a 4th PWM channel +// 4th PWM channel requires manually turning the pin on/off via interrupt :( +ISR(TIMER1_OVF_vect) { + //bitClear(PORTB, 3); + PORTB &= 0b11110111; + //PORTB |= 0b00001000; +} +ISR(TIMER1_COMPA_vect) { + //if (!bitRead(TIFR,TOV1)) bitSet(PORTB, 3); + if (! (TIFR & (1<<TOV1))) PORTB |= 0b00001000; + //if (! (TIFR & (1<<TOV1))) PORTB &= 0b11110111; +} +#endif + |