diff options
Diffstat (limited to 'watch-library/watch/watch_extint.c')
| -rw-r--r-- | watch-library/watch/watch_extint.c | 70 |
1 files changed, 32 insertions, 38 deletions
diff --git a/watch-library/watch/watch_extint.c b/watch-library/watch/watch_extint.c index 1199dd35..f2bad949 100644 --- a/watch-library/watch/watch_extint.c +++ b/watch-library/watch/watch_extint.c @@ -37,62 +37,53 @@ void watch_disable_external_interrupts() { } 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); - + uint8_t config_index; + uint8_t sense_pos; 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); + case A0: + // for EIC channels 8-15, we need to set the SENSE value in CONFIG[1] + config_index = (WATCH_A0_EIC_CHANNEL > 7) ? 1 : 0; + // either way the index in CONFIG[n] must be 0-7 + sense_pos = 4 * (WATCH_A0_EIC_CHANNEL % 8); 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); + config_index = (WATCH_A1_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_A1_EIC_CHANNEL % 8); break; case A2: - pinmux = PINMUX_PB02A_EIC_EXTINT2; - config &= ~EIC_CONFIG_SENSE2_Msk; - config |= EIC_CONFIG_SENSE2(trigger); + config_index = (WATCH_A2_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_A2_EIC_CHANNEL % 8); break; case A3: - pinmux = PINMUX_PB03A_EIC_EXTINT3; - config &= ~EIC_CONFIG_SENSE3_Msk; - config |= EIC_CONFIG_SENSE3(trigger); + config_index = (WATCH_A3_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_A3_EIC_CHANNEL % 8); break; - case A0: - pinmux = PINMUX_PB04A_EIC_EXTINT4; - config &= ~EIC_CONFIG_SENSE4_Msk; - config |= EIC_CONFIG_SENSE4(trigger); + case A4: + config_index = (WATCH_A4_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_A4_EIC_CHANNEL % 8); + break; + case BTN_ALARM: + // for the buttons, we need an internal pull-down. + gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); + config_index = (WATCH_BTN_ALARM_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_BTN_ALARM_EIC_CHANNEL % 8); break; case BTN_LIGHT: gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); - pinmux = WATCH_BTN_LIGHT_EIC_PINMUX; - config &= ~EIC_CONFIG_SENSE6_Msk; - config |= EIC_CONFIG_SENSE6(trigger); + config_index = (WATCH_BTN_LIGHT_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_BTN_LIGHT_EIC_CHANNEL % 8); break; case BTN_MODE: gpio_set_pin_pull_mode(pin, GPIO_PULL_DOWN); - pinmux = WATCH_BTN_MODE_EIC_PINMUX; - config &= ~EIC_CONFIG_SENSE7_Msk; - config |= EIC_CONFIG_SENSE7(trigger); + config_index = (WATCH_BTN_MODE_EIC_CHANNEL > 7) ? 1 : 0; + sense_pos = 4 * (WATCH_BTN_MODE_EIC_CHANNEL % 8); break; default: return; } gpio_set_pin_direction(pin, GPIO_DIRECTION_IN); - gpio_set_pin_function(pin, pinmux); + gpio_set_pin_function(pin, GPIO_PIN_FUNCTION_A); // EIC configuration register is enable-protected, so we have to disable it first... if (hri_eic_get_CTRLA_reg(EIC, EIC_CTRLA_ENABLE)) { @@ -101,9 +92,12 @@ void watch_register_interrupt_callback(const uint8_t pin, ext_irq_cb_t callback, hri_eic_wait_for_sync(EIC, EIC_SYNCBUSY_ENABLE); } // now update the configuration... - hri_eic_write_CONFIG_reg(EIC, 0, config); + hri_eic_config_reg_t config = EIC->CONFIG[config_index].reg; + config &= ~(7 << sense_pos); + config |= trigger << (sense_pos); + hri_eic_write_CONFIG_reg(EIC, config_index, config); // ...and re-enable the EIC - hri_eic_set_CTRLA_ENABLE_bit(EIC); + hri_eic_set_CTRLA_ENABLE_bit(EIC); ext_irq_register(pin, callback); } |