73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
#include "mcp23s17.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp23s17 {
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static const char *const TAG = "mcp23s17";
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// IOCON register bits
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static constexpr uint8_t IOCON_SEQOP = 0x20; // Sequential operation mode
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static constexpr uint8_t IOCON_HAEN = 0x08; // Hardware address enable
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static constexpr uint8_t IOCON_ODR = 0x04; // Open-drain output for INT pin
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void MCP23S17::set_device_address(uint8_t device_addr) {
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if (device_addr != 0) {
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this->device_opcode_ |= ((device_addr & 0b111) << 1);
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}
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}
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void MCP23S17::setup() {
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this->spi_setup();
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// Enable HAEN (broadcast to addresses 0 and 4 since HAEN isn't active yet)
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this->enable();
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this->transfer_byte(0b01000000);
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this->transfer_byte(mcp23x17_base::MCP23X17_IOCONA);
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this->transfer_byte(IOCON_SEQOP | IOCON_HAEN);
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this->disable();
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this->enable();
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this->transfer_byte(0b01001000);
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this->transfer_byte(mcp23x17_base::MCP23X17_IOCONA);
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this->transfer_byte(IOCON_SEQOP | IOCON_HAEN);
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this->disable();
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// Read current output register state
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this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
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this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
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if (this->open_drain_ints_) {
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// enable open-drain interrupt pins, 3.3V-safe (addressed, only this chip)
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this->write_reg(mcp23x17_base::MCP23X17_IOCONA, IOCON_SEQOP | IOCON_HAEN | IOCON_ODR);
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this->write_reg(mcp23x17_base::MCP23X17_IOCONB, IOCON_SEQOP | IOCON_HAEN | IOCON_ODR);
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}
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}
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void MCP23S17::dump_config() {
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ESP_LOGCONFIG(TAG, "MCP23S17:");
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LOG_PIN(" CS Pin: ", this->cs_);
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}
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bool MCP23S17::read_reg(uint8_t reg, uint8_t *value) {
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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(0xFF);
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this->disable();
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return true;
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}
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bool MCP23S17::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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} // namespace mcp23s17
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} // namespace esphome
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