github/esphome
2
0
Fork 0
mirror of https://github.com/esphome/esphome.git synced 2026-07-10 08:55:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

[sx1509] Configure interrupt mask and sense registers for input pins

Browse Source 
Unmask per-pin interrupts and set both-edge sense detection when
interrupt_pin is configured. Clear interrupt source in loop() to
deassert INT line after servicing.
This commit is contained in:
J. Nick Koston
2026-04-09 16:49:15 -10:00
parent 59065c71a8
commit 043d05cd12
1 changed files with 31 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
esphome/components/sx1509/sx1509.cpp
+31 -3
View File
@@ -54,8 +54,13 @@ void SX1509Component::dump_config() {
void SX1509Component::loop() {
// Reset cache at the start of each loop
this->reset_pin_cache_();
if (this->interrupt_pin_ != nullptr && !this->has_keypad_) {
this->disable_loop();
if (this->interrupt_pin_ != nullptr) {
// Clear interrupt source to deassert INT line
uint16_t interrupt_source = 0;
this->read_byte_16(REG_INTERRUPT_SOURCE_B, &interrupt_source);
if (!this->has_keypad_) {
this->disable_loop();
}
}
if (this->has_keypad_) {
@@ -185,7 +190,30 @@ void SX1509Component::pin_mode(uint8_t pin, gpio::Flags flags) {
// Set direction to input
this->ddr_mask_ |= (1 << pin);
this->write_byte_16(REG_DIR_B, this->ddr_mask_);
if (this->interrupt_pin_ == nullptr) {
if (this->interrupt_pin_ != nullptr) {
// Unmask this pin's interrupt (clear bit = enabled)
this->read_byte_16(REG_INTERRUPT_MASK_B, &temp_word);
temp_word &= ~(1 << pin);
this->write_byte_16(REG_INTERRUPT_MASK_B, temp_word);
// Configure sense to trigger on both edges (0b11)
// Sense registers: 2 bits per pin, 4 pins per byte
// REG_SENSE_HIGH_B: pins 12-15, REG_SENSE_LOW_B: pins 8-11
// REG_SENSE_HIGH_A: pins 4-7, REG_SENSE_LOW_A: pins 0-3
uint8_t sense_reg = pin < 4 ? REG_SENSE_LOW_A
: pin < 8 ? REG_SENSE_HIGH_A
: pin < 12 ? REG_SENSE_LOW_B
: REG_SENSE_HIGH_B;
uint8_t sense_val = 0;
this->read_byte(sense_reg, &sense_val);
uint8_t shift = (pin % 4) * 2;
sense_val &= ~(0x03 << shift);
sense_val |= (0x03 << shift); // Both edges
this->write_byte(sense_reg, sense_val);
// Clear any pending interrupt for this pin
this->write_byte_16(REG_INTERRUPT_SOURCE_B, 1 << pin);
} else {
this->enable_loop();
}
}