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https://github.com/esphome/esphome.git
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122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
#include "mcp23s08.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp23s08 {
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static const char *TAG = "mcp23s08";
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void MCP23S08::set_device_address(uint8_t device_addr) {
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if (device_addr != 0) {
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this->device_opcode_ |= ((device_addr & 0x03) << 1);
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}
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}
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void MCP23S08::setup() {
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ESP_LOGCONFIG(TAG, "Setting up MCP23S08...");
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this->spi_setup();
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this->enable();
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this->transfer_byte(MCP23S08_IODIR);
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this->transfer_byte(0xFF);
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for (uint8_t i = 0; i < MCP23S08_OLAT; i++) {
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this->transfer_byte(0x00);
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}
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this->disable();
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}
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void MCP23S08::dump_config() {
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ESP_LOGCONFIG(TAG, "MCP23S08:");
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LOG_PIN(" CS Pin: ", this->cs_);
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}
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float MCP23S08::get_setup_priority() const { return setup_priority::HARDWARE; }
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bool MCP23S08::digital_read(uint8_t pin) {
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if (pin > 7) {
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return false;
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}
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uint8_t bit = pin % 8;
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uint8_t reg_addr = MCP23S08_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 MCP23S08::digital_write(uint8_t pin, bool value) {
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if (pin > 7) {
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return;
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}
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uint8_t reg_addr = MCP23S08_OLAT;
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this->update_reg(pin, value, reg_addr);
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}
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void MCP23S08::pin_mode(uint8_t pin, uint8_t mode) {
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uint8_t iodir = MCP23S08_IODIR;
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uint8_t gppu = MCP23S08_GPPU;
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switch (mode) {
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case MCP23S08_INPUT:
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this->update_reg(pin, true, iodir);
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break;
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case MCP23S08_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 MCP23S08_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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void MCP23S08::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 == MCP23S08_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 == MCP23S08_OLAT) {
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this->olat_ = reg_value;
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}
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}
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bool MCP23S08::write_reg(uint8_t reg, uint8_t value) {
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this->enable();
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this->transfer_byte(this->device_opcode_);
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this->transfer_byte(reg);
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this->transfer_byte(value);
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this->disable();
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return true;
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}
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bool MCP23S08::read_reg(uint8_t reg, uint8_t *value) {
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uint8_t data;
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this->enable();
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this->transfer_byte(this->device_opcode_ | 1);
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this->transfer_byte(reg);
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*value = this->transfer_byte(0);
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this->disable();
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return true;
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}
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MCP23S08GPIOPin::MCP23S08GPIOPin(MCP23S08 *parent, uint8_t pin, uint8_t mode, bool inverted)
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: GPIOPin(pin, mode, inverted), parent_(parent) {}
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void MCP23S08GPIOPin::setup() { this->pin_mode(this->mode_); }
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void MCP23S08GPIOPin::pin_mode(uint8_t mode) { this->parent_->pin_mode(this->pin_, mode); }
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bool MCP23S08GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
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void MCP23S08GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
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} // namespace mcp23s08
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} // namespace esphome
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