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Diffstat (limited to 'arch/attiny1634.c')
| -rw-r--r-- | arch/attiny1634.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/arch/attiny1634.c b/arch/attiny1634.c new file mode 100644 index 0000000..e29d1c3 --- /dev/null +++ b/arch/attiny1634.c @@ -0,0 +1,214 @@ +// arch/attiny1634.c: attiny85 support functions +// Copyright (C) 2014-2023 Selene ToyKeeper +// SPDX-License-Identifier: GPL-3.0-or-later +#pragma once + +#include "arch/attiny1634.h" + +////////// clock speed / delay stuff ////////// + +inline void mcu_clock_speed() { + // TODO? + // (or not; clock speed is set by the fuses) + // attiny1634 datasheet 6.5 + // CLKSR = [OSCRDY, CSTR, CKOUT_IO, SUT, CKSEL3/2/1/0] + // default 8MHz calibrated internal clock: SUT=0, CKSEL=0b0010 + #if 0 + cli(); + CCP = 0xD8; + CLKSR = 0b01000010; + CCP = 0xD8; + CLKPR = 0; // CLK / 1 = full speed, 8 MHz + sei(); + #endif +} + +///// clock dividers +inline void clock_prescale_set(uint8_t n) { + cli(); + // _PROTECTED_WRITE(CLKPR, n); + CCP = 0xD8; + CLKPR = n; + sei(); +} + +////////// default hw_setup() ////////// + + +////////// ADC voltage / temperature ////////// + +inline void mcu_set_admux_therm() { + // put the ADC in temperature mode + // DS table 19-3, 19-4, internal sensor / 1.1V ref + // [refs1, refs0, refen, adc0en, mux3, mux2, mux1, mux0] + // refs=0b10 : internal 1.1V ref + // mux=0b1110 : internal temperature sensor + //#define ADMUX_THERM 0b10001110 + ADMUX = ADMUX_THERM; + // other stuff is already set, so no need to re-set it +} + +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; + // disable digital input on divider pin to reduce power consumption + // TODO: this should be in hwdef init, not here + VOLTAGE_ADC_DIDR |= (1 << VOLTAGE_ADC); + #else // VCC / 1.1V reference + ADMUX = ADMUX_VCC; + // 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 + //ACSRA |= (1 << ACD); // turn off analog comparator to save power + // ADCSRB: [VDEN, VDPD, -, -, ADLAR, ADTS2, ADTS1, ADTS0] + ADCSRB = (1 << ADLAR); // left-adjust, free-running + //ADCSRB = 0; // right-adjust, free-running +} + +inline void mcu_adc_sleep_mode() { + set_sleep_mode(SLEEP_MODE_ADC); +} + +inline void mcu_adc_start_measurement() { + // [ADEN, ADSC, ADATE, adif, ADIE, ADPS2, ADPS1, ADPS0] + 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 uint16_t mcu_adc_result() { return (uint16_t)(ADCL | (ADCH << 8)); } +// right-adjusted mode: +/* +inline uint16_t mcu_adc_result() { + uint16_t result = (ADCL | (ADCH << 8)) << 6; + return result; +} +*/ + +inline uint8_t mcu_vdd_raw2cooked(uint16_t measurement) { + // In : 65535 * 1.1 / Vbat + // Out: uint8_t: Vbat * 40 + // 1.1 = ADC Vref + #if 0 + // 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); + #else + // ... spend the extra 84 bytes of ROM for better precision + // 4096 = how much ADC resolution we're using (12 bits) + uint8_t vbat40 = (uint32_t)(40 * 1.1 * 4096) / (measurement >> 4); + #endif + 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); + // right-adjusted mode: + // datasheet 19.13.3.2: + // "When ADCL is read, the ADC Data Register is not updated + // until ADCH is read. ... ADCL must be read first, then ADCH." + // So... gotta read it even if not needed? + // (the value doesn't matter here, the lower bits are only used + // for generating some random seed data) + //return ADCL + ADCH; +} + + +////////// WDT ////////// + +inline void mcu_wdt_active() { + wdt_reset(); // Reset the WDT + WDTCSR = (1<<WDIE); // Enable interrupt every 16ms +} + +inline void mcu_wdt_standby() { + wdt_reset(); // Reset the WDT + WDTCSR = (1<<WDIE) | STANDBY_TICK_SPEED; +} + +inline void mcu_wdt_stop() { + cli(); // needed because CCP, below + wdt_reset(); // Reset the WDT + MCUSR &= ~(1<<WDRF); // clear watchdog reset flag + // _PROTECTED_WRITE(WDTCSR, 0); + CCP = 0xD8; // enable config changes + WDTCSR = 0; // disable and clear all WDT settings + sei(); +} + + +////////// PCINT - pin change interrupt (e-switch) ////////// + +inline void mcu_pcint_on() { + // enable pin change interrupt + #ifdef SWITCH2_PCIE + GIMSK |= ((1 << SWITCH_PCIE) | (1 << SWITCH2_PCIE)); + #else + GIMSK |= (1 << SWITCH_PCIE); + #endif +} + +inline void mcu_pcint_off() { + // disable all pin-change interrupts + GIMSK &= ~(1 << SWITCH_PCIE); +} + + +////////// misc ////////// + +void reboot() { + // put the WDT in hard reset mode, then trigger it + cli(); + // _PROTECTED_WRITE(WDTCSR, 0b10001000); + // allow protected configuration changes for next 4 clock cycles + CCP = 0xD8; // magic number + // reset (WDIF + WDE), no WDIE, fastest (16ms) timing (0000) + // (DS section 8.5.2 and table 8-4) + WDTCSR = 0b10001000; + sei(); + wdt_reset(); + while (1) {} +} + +inline void prevent_reboot_loop() { + // prevent WDT from rebooting MCU again + MCUSR &= ~(1<<WDRF); // reset status flag + wdt_disable(); // from avr/wdt.h +} + |