diff options
Diffstat (limited to 'watch-library/watch/watch_extint.c')
| -rw-r--r-- | watch-library/watch/watch_extint.c | 100 |
1 files changed, 89 insertions, 11 deletions
diff --git a/watch-library/watch/watch_extint.c b/watch-library/watch/watch_extint.c index 19f6041a..421700bc 100644 --- a/watch-library/watch/watch_extint.c +++ b/watch-library/watch/watch_extint.c @@ -22,18 +22,96 @@ * SOFTWARE. */ - void watch_enable_buttons() { - EXTERNAL_IRQ_0_init(); +void watch_enable_external_interrupts() { + // Configure EIC to use GCLK3 (the 32.768 kHz crystal) + hri_gclk_write_PCHCTRL_reg(GCLK, EIC_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK3_Val | (1 << GCLK_PCHCTRL_CHEN_Pos)); + // Enable AHB clock for the EIC + hri_mclk_set_APBAMASK_EIC_bit(MCLK); + // call HAL's external interrupt init function + ext_irq_init(); } -void watch_register_button_callback(const uint8_t pin, ext_irq_cb_t callback) { - if (pin == BTN_ALARM) { - gpio_set_pin_direction(BTN_ALARM, GPIO_DIRECTION_IN); - gpio_set_pin_pull_mode(BTN_ALARM, GPIO_PULL_DOWN); - gpio_set_pin_function(BTN_ALARM, PINMUX_PA02G_RTC_IN2); - btn_alarm_callback = callback; - _extwake_register_callback(&CALENDAR_0.device, extwake_callback); - } else { - ext_irq_register(pin, callback); +void watch_disable_external_interrupts() { + ext_irq_deinit(); + hri_mclk_clear_APBAMASK_EIC_bit(MCLK); +} + +void watch_register_interrupt_callback(const uint8_t pin, ext_irq_cb_t callback, watch_interrupt_trigger trigger) { + uint32_t pinmux; + hri_eic_config_reg_t config = hri_eic_get_CONFIG_reg(EIC, 0, 0xFFFFFFFF); + + switch (pin) { + case A4: + // same steps for each: determine the correct pin mux... + pinmux = PINMUX_PB00A_EIC_EXTINT0; + // ...clear out the configuration for this EIC channel... + config &= ~EIC_CONFIG_SENSE0_Msk; + // ...and reconfigure it with our new trigger value. + config |= EIC_CONFIG_SENSE0(trigger); + break; + case A1: + pinmux = PINMUX_PB01A_EIC_EXTINT1; + config &= ~EIC_CONFIG_SENSE1_Msk; + config |= EIC_CONFIG_SENSE1(trigger); + break; + case BTN_ALARM: + gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); + pinmux = PINMUX_PA02A_EIC_EXTINT2; + config &= ~EIC_CONFIG_SENSE2_Msk; + config |= EIC_CONFIG_SENSE2(trigger); + break; + case A2: + pinmux = PINMUX_PB02A_EIC_EXTINT2; + config &= ~EIC_CONFIG_SENSE2_Msk; + config |= EIC_CONFIG_SENSE2(trigger); + break; + case A3: + pinmux = PINMUX_PB03A_EIC_EXTINT3; + config &= ~EIC_CONFIG_SENSE3_Msk; + config |= EIC_CONFIG_SENSE3(trigger); + break; + case A0: + pinmux = PINMUX_PB04A_EIC_EXTINT4; + config &= ~EIC_CONFIG_SENSE4_Msk; + config |= EIC_CONFIG_SENSE4(trigger); + break; + case BTN_LIGHT: + gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); + pinmux = PINMUX_PA22A_EIC_EXTINT6; + config &= ~EIC_CONFIG_SENSE6_Msk; + config |= EIC_CONFIG_SENSE6(trigger); + break; + case BTN_MODE: + gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); + pinmux = PINMUX_PA23A_EIC_EXTINT7; + config &= ~EIC_CONFIG_SENSE7_Msk; + config |= EIC_CONFIG_SENSE7(trigger); + break; + default: + return; + } + + gpio_set_pin_direction(pin, GPIO_DIRECTION_IN); + gpio_set_pin_function(pin, pinmux); + + // EIC configuration register is enable-protected, so we have to disable it first... + if (hri_eic_get_CTRLA_reg(EIC, EIC_CTRLA_ENABLE)) { + hri_eic_clear_CTRLA_ENABLE_bit(EIC); + // ...and wait for it to synchronize. + hri_eic_wait_for_sync(EIC, EIC_SYNCBUSY_ENABLE); } + // now update the configuration... + hri_eic_write_CONFIG_reg(EIC, 0, config); + // ...and re-enable the EIC + hri_eic_set_CTRLA_ENABLE_bit(EIC); + + ext_irq_register(pin, callback); +} + +inline void watch_register_button_callback(const uint8_t pin, ext_irq_cb_t callback) { + watch_register_interrupt_callback(pin, callback, INTERRUPT_TRIGGER_RISING); +} + +inline void watch_enable_buttons() { + watch_enable_external_interrupts(); } |