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more work on alternate board pinouts

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This commit is contained in:
Joey Castillo
2021-09-14 15:12:30 -04:00
parent e4c1700806
commit cb98f29e57
6 changed files with 108 additions and 99 deletions
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70
watch-library/watch/watch_extint.c
View File

@@ -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);
}

7
watch-library/watch/watch_extint.h
View File

@@ -59,16 +59,15 @@ void watch_disable_external_interrupts();
* want to detect both rising and falling conditions (i.e. button down and button up), use
* INTERRUPT_TRIGGER_BOTH and use watch_get_pin_level to check the pin level in your callback
* to determine which condition caused the interrupt.
* @param pin One of pins BTN_LIGHT, BTN_MODE, BTN_ALARM, or A0-A5. If the pin parameter matches one of
* @param pin One of pins BTN_LIGHT, BTN_MODE, BTN_ALARM, or A0-A4. If the pin parameter matches one of
* the three button pins, this function will also enable an internal pull-down resistor. If
* the pin parameter is A0-A5, you are responsible for setting any required pull configuration
* the pin parameter is A0-A4, you are responsible for setting any required pull configuration
* using watch_enable_pull_up or watch_enable_pull_down.
* @param callback The function you wish to have called when the button is pressed.
* @param trigger The condition on which you wish to trigger: rising, falling or both.
* @note The alarm button and pin A2 share an external interrupt channel EXTINT[2]; you can only use one
* or the other. However! These pins both have an alternate method of triggering via the RTC tamper
* interrupt, which for A2 at least has the added benefit of being able to trigger in the low-power
* BACKUP mode.
* interrupt, which has the added benefit of not requiring the external interrupt controller at all.
* @see watch_register_extwake_callback
*/
void watch_register_interrupt_callback(const uint8_t pin, ext_irq_cb_t callback, watch_interrupt_trigger trigger);