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https://github.com/esphome/esphome.git
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94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
#include "mcp23008.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp23008 {
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static const char *TAG = "mcp23008";
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void MCP23008::setup() {
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ESP_LOGCONFIG(TAG, "Setting up MCP23008...");
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uint8_t iocon;
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if (!this->read_reg_(MCP23008_IOCON, &iocon)) {
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this->mark_failed();
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return;
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}
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe
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this->write_reg_(MCP23008_IOCON, 0x04);
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}
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}
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bool MCP23008::digital_read(uint8_t pin) {
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uint8_t bit = pin % 8;
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uint8_t reg_addr = MCP23008_GPIO;
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uint8_t value = 0;
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this->read_reg_(reg_addr, &value);
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return value & (1 << bit);
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}
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void MCP23008::digital_write(uint8_t pin, bool value) {
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uint8_t reg_addr = MCP23008_OLAT;
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this->update_reg_(pin, value, reg_addr);
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}
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void MCP23008::pin_mode(uint8_t pin, uint8_t mode) {
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uint8_t iodir = MCP23008_IODIR;
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uint8_t gppu = MCP23008_GPPU;
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switch (mode) {
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case MCP23008_INPUT:
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this->update_reg_(pin, true, iodir);
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break;
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case MCP23008_INPUT_PULLUP:
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this->update_reg_(pin, true, iodir);
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this->update_reg_(pin, true, gppu);
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break;
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case MCP23008_OUTPUT:
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this->update_reg_(pin, false, iodir);
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break;
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default:
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break;
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}
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}
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float MCP23008::get_setup_priority() const { return setup_priority::HARDWARE; }
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bool MCP23008::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 MCP23008::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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void MCP23008::update_reg_(uint8_t pin, bool pin_value, uint8_t reg_addr) {
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uint8_t bit = pin % 8;
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uint8_t reg_value = 0;
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if (reg_addr == MCP23008_OLAT) {
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reg_value = this->olat_;
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} else {
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this->read_reg_(reg_addr, ®_value);
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}
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if (pin_value)
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reg_value |= 1 << bit;
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else
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reg_value &= ~(1 << bit);
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this->write_reg_(reg_addr, reg_value);
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if (reg_addr == MCP23008_OLAT) {
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this->olat_ = reg_value;
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}
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}
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MCP23008GPIOPin::MCP23008GPIOPin(MCP23008 *parent, uint8_t pin, uint8_t mode, bool inverted)
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: GPIOPin(pin, mode, inverted), parent_(parent) {}
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void MCP23008GPIOPin::setup() { this->pin_mode(this->mode_); }
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void MCP23008GPIOPin::pin_mode(uint8_t mode) { this->parent_->pin_mode(this->pin_, mode); }
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bool MCP23008GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
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void MCP23008GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
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} // namespace mcp23008
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} // namespace esphome
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