mirror of https://github.com/esphome/esphome.git
90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
#include "mcp23x17_base.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp23x17_base {
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static const char *const TAG = "mcp23x17_base";
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bool MCP23X17Base::digital_read(uint8_t pin) {
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uint8_t bit = pin % 8;
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uint8_t reg_addr = pin < 8 ? mcp23x17_base::MCP23X17_GPIOA : mcp23x17_base::MCP23X17_GPIOB;
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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 MCP23X17Base::digital_write(uint8_t pin, bool value) {
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uint8_t reg_addr = pin < 8 ? mcp23x17_base::MCP23X17_OLATA : mcp23x17_base::MCP23X17_OLATB;
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this->update_reg(pin, value, reg_addr);
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}
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void MCP23X17Base::pin_mode(uint8_t pin, gpio::Flags flags) {
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uint8_t iodir = pin < 8 ? mcp23x17_base::MCP23X17_IODIRA : mcp23x17_base::MCP23X17_IODIRB;
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uint8_t gppu = pin < 8 ? mcp23x17_base::MCP23X17_GPPUA : mcp23x17_base::MCP23X17_GPPUB;
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if (flags == gpio::FLAG_INPUT) {
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this->update_reg(pin, true, iodir);
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this->update_reg(pin, false, gppu);
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} else if (flags == (gpio::FLAG_INPUT | gpio::FLAG_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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} else if (flags == gpio::FLAG_OUTPUT) {
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this->update_reg(pin, false, iodir);
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}
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}
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void MCP23X17Base::pin_interrupt_mode(uint8_t pin, mcp23xxx_base::MCP23XXXInterruptMode interrupt_mode) {
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uint8_t gpinten = pin < 8 ? mcp23x17_base::MCP23X17_GPINTENA : mcp23x17_base::MCP23X17_GPINTENB;
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uint8_t intcon = pin < 8 ? mcp23x17_base::MCP23X17_INTCONA : mcp23x17_base::MCP23X17_INTCONB;
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uint8_t defval = pin < 8 ? mcp23x17_base::MCP23X17_DEFVALA : mcp23x17_base::MCP23X17_DEFVALB;
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switch (interrupt_mode) {
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case mcp23xxx_base::MCP23XXX_CHANGE:
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this->update_reg(pin, true, gpinten);
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this->update_reg(pin, false, intcon);
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break;
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case mcp23xxx_base::MCP23XXX_RISING:
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this->update_reg(pin, true, gpinten);
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this->update_reg(pin, true, intcon);
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this->update_reg(pin, true, defval);
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break;
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case mcp23xxx_base::MCP23XXX_FALLING:
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this->update_reg(pin, true, gpinten);
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this->update_reg(pin, true, intcon);
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this->update_reg(pin, false, defval);
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break;
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case mcp23xxx_base::MCP23XXX_NO_INTERRUPT:
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this->update_reg(pin, false, gpinten);
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break;
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}
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}
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void MCP23X17Base::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 == mcp23x17_base::MCP23X17_OLATA) {
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reg_value = this->olat_a_;
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} else if (reg_addr == mcp23x17_base::MCP23X17_OLATB) {
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reg_value = this->olat_b_;
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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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}
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this->write_reg(reg_addr, reg_value);
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if (reg_addr == mcp23x17_base::MCP23X17_OLATA) {
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this->olat_a_ = reg_value;
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} else if (reg_addr == mcp23x17_base::MCP23X17_OLATB) {
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this->olat_b_ = reg_value;
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}
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}
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} // namespace mcp23x17_base
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} // namespace esphome
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