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/*
* MIT License
*
* Copyright (c) 2020 Joey Castillo
*
* 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:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* 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 "watch_extint.h"
// this warning only appears when you `make BOARD=OSO-SWAT-A1-02`. it's annoying,
// but i'd rather have it warn us at build-time than fail silently at run-time.
// besides, no one but me really has any of these boards anyway.
#if BTN_ALARM != GPIO(GPIO_PORTA, 2)
#warning This board revision does not support external wake on BTN_ALARM, so watch_register_extwake_callback will not work with it. Use watch_register_interrupt_callback instead.
#endif
void watch_register_extwake_callback(uint8_t pin, ext_irq_cb_t callback, bool level) {
uint32_t pinmux;
hri_rtc_tampctrl_reg_t config = RTC->MODE2.TAMPCTRL.reg;
switch (pin) {
case A4:
a4_callback = callback;
pinmux = PINMUX_PB00G_RTC_IN0;
config &= ~(3 << RTC_TAMPCTRL_IN0ACT_Pos);
config &= ~(1 << RTC_TAMPCTRL_TAMLVL0_Pos);
config |= 1 << RTC_TAMPCTRL_IN0ACT_Pos;
config |= 1 << RTC_TAMPCTRL_DEBNC0_Pos;
if (level) config |= 1 << RTC_TAMPCTRL_TAMLVL0_Pos;
break;
case A2:
a2_callback = callback;
pinmux = PINMUX_PB02G_RTC_IN1;
config &= ~(3 << RTC_TAMPCTRL_IN1ACT_Pos);
config &= ~(1 << RTC_TAMPCTRL_TAMLVL1_Pos);
config |= 1 << RTC_TAMPCTRL_IN1ACT_Pos;
config |= 1 << RTC_TAMPCTRL_DEBNC1_Pos;
if (level) config |= 1 << RTC_TAMPCTRL_TAMLVL1_Pos;
break;
case BTN_ALARM:
gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN);
btn_alarm_callback = callback;
pinmux = PINMUX_PA02G_RTC_IN2;
config &= ~(3 << RTC_TAMPCTRL_IN2ACT_Pos);
config &= ~(1 << RTC_TAMPCTRL_TAMLVL2_Pos);
config |= 1 << RTC_TAMPCTRL_IN2ACT_Pos;
config |= 1 << RTC_TAMPCTRL_DEBNC2_Pos;
if (level) config |= 1 << RTC_TAMPCTRL_TAMLVL2_Pos;
break;
default:
return;
}
gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(pin, pinmux);
// disable the RTC
RTC->MODE2.CTRLA.bit.ENABLE = 0;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
// update the configuration
RTC->MODE2.TAMPCTRL.reg = config;
// re-enable the RTC
RTC->MODE2.CTRLA.bit.ENABLE = 1;
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_EnableIRQ(RTC_IRQn);
RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_TAMPER;
}
void watch_disable_extwake_interrupt(uint8_t pin) {
hri_rtc_tampctrl_reg_t config = hri_rtc_get_TAMPCTRL_reg(RTC, 0xFFFFFFFF);
switch (pin) {
case A4:
a4_callback = NULL;
config &= ~(3 << RTC_TAMPCTRL_IN0ACT_Pos);
break;
case A2:
a2_callback = NULL;
config &= ~(3 << RTC_TAMPCTRL_IN1ACT_Pos);
break;
case BTN_ALARM:
btn_alarm_callback = NULL;
config &= ~(3 << RTC_TAMPCTRL_IN2ACT_Pos);
break;
default:
return;
}
if (hri_rtcmode0_get_CTRLA_ENABLE_bit(RTC)) {
hri_rtcmode0_clear_CTRLA_ENABLE_bit(RTC);
hri_rtcmode0_wait_for_sync(RTC, RTC_MODE0_SYNCBUSY_ENABLE);
}
hri_rtc_write_TAMPCTRL_reg(RTC, config);
hri_rtcmode0_set_CTRLA_ENABLE_bit(RTC);
}
void watch_store_backup_data(uint32_t data, uint8_t reg) {
if (reg < 8) {
RTC->MODE0.BKUP[reg].reg = data;
}
}
uint32_t watch_get_backup_data(uint8_t reg) {
if (reg < 8) {
return RTC->MODE0.BKUP[reg].reg;
}
return 0;
}
void _watch_disable_all_pins_except_rtc() {
uint32_t config = RTC->MODE0.TAMPCTRL.reg;
uint32_t portb_pins_to_disable = 0xFFFFFFFF;
// if there's an action set on RTC/IN[0], leave PB00 configured
if (config & RTC_TAMPCTRL_IN0ACT_Msk) portb_pins_to_disable &= 0xFFFFFFFE;
// same with RTC/IN[1] and PB02
if (config & RTC_TAMPCTRL_IN1ACT_Msk) portb_pins_to_disable &= 0xFFFFFFFB;
// port A: always keep PA02 configured as-is; that's our ALARM button.
gpio_set_port_direction(0, 0xFFFFFFFB, GPIO_DIRECTION_OFF);
// port B: disable all pins we didn't save above.
gpio_set_port_direction(1, portb_pins_to_disable, GPIO_DIRECTION_OFF);
}
void _watch_disable_all_peripherals_except_slcd() {
_watch_disable_tcc();
watch_disable_adc();
watch_disable_external_interrupts();
watch_disable_i2c();
// TODO: replace this with a proper function when we remove the debug UART
SERCOM3->USART.CTRLA.reg &= ~SERCOM_USART_CTRLA_ENABLE;
MCLK->APBCMASK.reg &= ~MCLK_APBCMASK_SERCOM3;
}
void watch_enter_shallow_sleep(bool display_on) {
if (!display_on) {
slcd_sync_deinit(&SEGMENT_LCD_0);
hri_mclk_clear_APBCMASK_SLCD_bit(SLCD);
}
// disable all other peripherals
_watch_disable_all_peripherals_except_slcd();
// disable tick interrupt
watch_rtc_disable_all_periodic_callbacks();
// disable brownout detector interrupt, which could inadvertently wake us up.
SUPC->INTENCLR.bit.BOD33DET = 1;
// disable all pins
_watch_disable_all_pins_except_rtc();
// enter standby (4); we basically hang out here until an interrupt wakes us.
sleep(4);
// and we awake! re-enable the brownout detector
SUPC->INTENSET.bit.BOD33DET = 1;
// call app_setup so the app can re-enable everything we disabled.
app_setup();
// and call app_wake_from_sleep (since main won't have a chance to do it)
app_wake_from_sleep();
}
void watch_enter_deep_sleep() {
// this will not work on the current silicon revision, but I said in the documentation that we do it.
// so let's do it!
watch_register_extwake_callback(BTN_ALARM, NULL, true);
watch_rtc_disable_all_periodic_callbacks();
_watch_disable_all_peripherals_except_slcd();
slcd_sync_deinit(&SEGMENT_LCD_0);
hri_mclk_clear_APBCMASK_SLCD_bit(SLCD);
_watch_disable_all_pins_except_rtc();
// go into backup sleep mode (5). when we exit, the reset controller will take over.
sleep(5);
}
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