MCP23SXX I/O Expander - SPI (#1068)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
2025-10-25 21:23:53 +01:00 · 2020-12-06 12:43:55 -05:00
parent c12c9e97c2
commit 7cd4c3bdd3
9 changed files with 571 additions and 0 deletions
--- a/esphome/components/mcp23s17/mcp23s17.cpp
+++ b/esphome/components/mcp23s17/mcp23s17.cpp
@@ -0,0 +1,126 @@
+#include "mcp23s17.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace mcp23s17 {
+
+static const char *TAG = "mcp23s17";
+
+void MCP23S17::set_device_address(uint8_t device_addr) {
+  if (device_addr != 0) {
+    this->device_opcode_ |= ((device_addr & 0b111) << 1);
+  }
+}
+
+void MCP23S17::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up MCP23S17...");
+  this->spi_setup();
+
+  this->enable();
+  uint8_t cmd = 0b01000000;
+  this->transfer_byte(cmd);
+  this->transfer_byte(0x18);
+  this->transfer_byte(0x0A);
+  this->transfer_byte(this->device_opcode_);
+  this->transfer_byte(0);
+  this->transfer_byte(0xFF);
+  this->transfer_byte(0xFF);
+
+  for (uint8_t i = 0; i < 20; i++) {
+    this->transfer_byte(0);
+  }
+  this->disable();
+}
+
+void MCP23S17::dump_config() {
+  ESP_LOGCONFIG(TAG, "MCP23S17:");
+  LOG_PIN("  CS Pin: ", this->cs_);
+}
+
+float MCP23S17::get_setup_priority() const { return setup_priority::HARDWARE; }
+
+bool MCP23S17::digital_read(uint8_t pin) {
+  uint8_t bit = pin % 8;
+  uint8_t reg_addr = pin < 8 ? MCP23S17_GPIOA : MCP23S17_GPIOB;
+  uint8_t value = 0;
+  this->read_reg(reg_addr, &value);
+  return value & (1 << bit);
+}
+
+void MCP23S17::digital_write(uint8_t pin, bool value) {
+  uint8_t reg_addr = pin < 8 ? MCP23S17_OLATA : MCP23S17_OLATB;
+  this->update_reg(pin, value, reg_addr);
+}
+
+void MCP23S17::pin_mode(uint8_t pin, uint8_t mode) {
+  uint8_t iodir = pin < 8 ? MCP23S17_IODIRA : MCP23S17_IODIRB;
+  uint8_t gppu = pin < 8 ? MCP23S17_GPPUA : MCP23S17_GPPUB;
+  switch (mode) {
+    case MCP23S17_INPUT:
+      this->update_reg(pin, true, iodir);
+      break;
+    case MCP23S17_INPUT_PULLUP:
+      this->update_reg(pin, true, iodir);
+      this->update_reg(pin, true, gppu);
+      break;
+    case MCP23S17_OUTPUT:
+      this->update_reg(pin, false, iodir);
+      break;
+    default:
+      break;
+  }
+}
+
+void MCP23S17::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 == MCP23S17_OLATA) {
+    reg_value = this->olat_a_;
+  } else if (reg_addr == MCP23S17_OLATB) {
+    reg_value = this->olat_b_;
+  } 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 == MCP23S17_OLATA) {
+    this->olat_a_ = reg_value;
+  } else if (reg_addr == MCP23S17_OLATB) {
+    this->olat_b_ = reg_value;
+  }
+}
+
+bool MCP23S17::read_reg(uint8_t reg, uint8_t *value) {
+  this->enable();
+  this->transfer_byte(this->device_opcode_ | 1);
+  this->transfer_byte(reg);
+  *value = this->transfer_byte(0xFF);
+  this->disable();
+  return true;
+}
+
+bool MCP23S17::write_reg(uint8_t reg, uint8_t value) {
+  this->enable();
+  this->transfer_byte(this->device_opcode_);
+  this->transfer_byte(reg);
+  this->transfer_byte(value);
+
+  this->disable();
+  return true;
+}
+
+MCP23S17GPIOPin::MCP23S17GPIOPin(MCP23S17 *parent, uint8_t pin, uint8_t mode, bool inverted)
+    : GPIOPin(pin, mode, inverted), parent_(parent) {}
+void MCP23S17GPIOPin::setup() { this->pin_mode(this->mode_); }
+void MCP23S17GPIOPin::pin_mode(uint8_t mode) { this->parent_->pin_mode(this->pin_, mode); }
+bool MCP23S17GPIOPin::digital_read() { return this->parent_->digital_read(this->pin_) != this->inverted_; }
+void MCP23S17GPIOPin::digital_write(bool value) { this->parent_->digital_write(this->pin_, value != this->inverted_); }
+
+}  // namespace mcp23s17
+}  // namespace esphome