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https://github.com/esphome/esphome.git
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59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
#include "mcp23017.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp23017 {
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static const char *const TAG = "mcp23017";
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static constexpr uint8_t IOCON_MIRROR = 0x40; // Mirror INTA/INTB pins
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static constexpr uint8_t IOCON_ODR = 0x04; // Open-drain output for INT pin
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void MCP23017::setup() {
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uint8_t iocon;
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if (!this->read_reg(mcp23x17_base::MCP23X17_IOCONA, &iocon)) {
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this->mark_failed();
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return;
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}
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// Read current output register state
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this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
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this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
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uint8_t iocon_flags = 0;
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if (this->open_drain_ints_) {
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iocon_flags |= IOCON_ODR;
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}
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if (this->interrupt_pin_ != nullptr) {
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// Mirror INTA/INTB so either pin fires for changes on any port
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iocon_flags |= IOCON_MIRROR;
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}
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if (iocon_flags != 0) {
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this->write_reg(mcp23x17_base::MCP23X17_IOCONA, iocon | iocon_flags);
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this->write_reg(mcp23x17_base::MCP23X17_IOCONB, iocon | iocon_flags);
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}
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this->setup_interrupt_pin_();
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}
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void MCP23017::dump_config() {
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ESP_LOGCONFIG(TAG, "MCP23017:");
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LOG_PIN(" Interrupt Pin: ", this->interrupt_pin_);
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}
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bool MCP23017::read_reg(uint8_t reg, uint8_t *value) {
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if (this->is_failed())
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return false;
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return this->read_byte(reg, value);
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}
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bool MCP23017::write_reg(uint8_t reg, uint8_t value) {
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if (this->is_failed())
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return false;
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return this->write_byte(reg, value);
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}
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} // namespace mcp23017
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} // namespace esphome
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