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feat: Add support for MCP23016 IO Expander (#1012)

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* feat: Add support for MCP23016 IO extander

* fix: Fix style
This commit is contained in:
Alex Reid
2020-04-12 15:07:10 -04:00
committed by GitHub
parent 835079ad43
commit c1dfed5c08
4 changed files with 230 additions and 0 deletions
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esphome/components/mcp23016/mcp23016.cpp
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#include "mcp23016.h"
#include "esphome/core/log.h"
namespace esphome {
namespace mcp23016 {
static const char *TAG = "mcp23016";
void MCP23016::setup() {
ESP_LOGCONFIG(TAG, "Setting up MCP23016...");
uint8_t iocon;
if (!this->read_reg_(MCP23016_IOCON0, &iocon)) {
this->mark_failed();
return;
}
// all pins input
this->write_reg_(MCP23016_IODIR0, 0xFF);
this->write_reg_(MCP23016_IODIR1, 0xFF);
}
bool MCP23016::digital_read(uint8_t pin) {
uint8_t bit = pin % 8;
uint8_t reg_addr = pin < 8 ? MCP23016_GP0 : MCP23016_GP1;
uint8_t value = 0;
this->read_reg_(reg_addr, &value);
return value & (1 << bit);
}
void MCP23016::digital_write(uint8_t pin, bool value) {
uint8_t reg_addr = pin < 8 ? MCP23016_OLAT0 : MCP23016_OLAT1;
this->update_reg_(pin, value, reg_addr);
}
void MCP23016::pin_mode(uint8_t pin, uint8_t mode) {
uint8_t iodir = pin < 8 ? MCP23016_IODIR0 : MCP23016_IODIR1;
switch (mode) {
case MCP23016_INPUT:
this->update_reg_(pin, true, iodir);
break;
case MCP23016_OUTPUT:
this->update_reg_(pin, false, iodir);
break;
default:
break;
}
}
float MCP23016::get_setup_priority() const { return setup_priority::HARDWARE; }
bool MCP23016::read_reg_(uint8_t reg, uint8_t *value) {
if (this->is_failed())
return false;
return this->read_byte(reg, value);
}
bool MCP23016::write_reg_(uint8_t reg, uint8_t value) {
if (this->is_failed())
return false;
return this->write_byte(reg, value);
}
void MCP23016::update_reg_(uint8_t pin, bool pin_value, uint8_t reg_addr) {
uint8_t bit = pin % 8;
uint8_t reg_value = 0;
if (reg_addr == MCP23016_OLAT0) {
reg_value = this->olat_0_;
} else if (reg_addr == MCP23016_OLAT1) {
reg_value = this->olat_1_;
} else {
this->read_reg_(reg_addr, &reg_value);
}
if (pin_value)
reg_value |= 1 << bit;
else
reg_value &= ~(1 << bit);
this->write_reg_(reg_addr, reg_value);
if (reg_addr == MCP23016_OLAT0) {
this->olat_0_ = reg_value;
} else if (reg_addr == MCP23016_OLAT1) {
this->olat_1_ = reg_value;
}
}
MCP23016GPIOPin::MCP23016GPIOPin(MCP23016 *parent, uint8_t pin, uint8_t mode, bool inverted)
: GPIOPin(pin, mode, inverted), parent_(parent) {}
void MCP23016GPIOPin::setup() { this->pin_mode(this->mode_); }
void MCP23016GPIOPin::pin_mode(uint8_t mode) { this->parent_->pin_mode(this->pin_, mode); }
bool MCP23016GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
void MCP23016GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
} // namespace mcp23016
} // namespace esphome