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93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
#include "one_wire_bus.h"
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#include "esphome/core/helpers.h"
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namespace esphome {
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namespace one_wire {
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static const char *const TAG = "one_wire";
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static const uint8_t DALLAS_MODEL_DS18S20 = 0x10;
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static const uint8_t DALLAS_MODEL_DS1822 = 0x22;
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static const uint8_t DALLAS_MODEL_DS18B20 = 0x28;
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static const uint8_t DALLAS_MODEL_DS1825 = 0x3B;
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static const uint8_t DALLAS_MODEL_DS28EA00 = 0x42;
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const uint8_t ONE_WIRE_ROM_SELECT = 0x55;
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const uint8_t ONE_WIRE_ROM_SEARCH = 0xF0;
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const std::vector<uint64_t> &OneWireBus::get_devices() { return this->devices_; }
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bool OneWireBus::reset_() {
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int res = this->reset_int();
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if (res == -1)
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ESP_LOGE(TAG, "1-wire bus is held low");
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return res == 1;
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}
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bool IRAM_ATTR OneWireBus::select(uint64_t address) {
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if (!this->reset_())
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return false;
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this->write8(ONE_WIRE_ROM_SELECT);
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this->write64(address);
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return true;
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}
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void OneWireBus::search() {
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this->devices_.clear();
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this->reset_search();
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uint64_t address;
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while (true) {
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if (!this->reset_()) {
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// Reset failed or no devices present
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return;
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}
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this->write8(ONE_WIRE_ROM_SEARCH);
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address = this->search_int();
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if (address == 0)
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break;
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auto *address8 = reinterpret_cast<uint8_t *>(&address);
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if (crc8(address8, 7) != address8[7]) {
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ESP_LOGW(TAG, "Dallas device 0x%s has invalid CRC.", format_hex(address).c_str());
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} else {
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this->devices_.push_back(address);
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}
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}
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}
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void OneWireBus::skip() {
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this->write8(0xCC); // skip ROM
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}
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const LogString *OneWireBus::get_model_str(uint8_t model) {
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switch (model) {
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case DALLAS_MODEL_DS18S20:
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return LOG_STR("DS18S20");
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case DALLAS_MODEL_DS1822:
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return LOG_STR("DS1822");
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case DALLAS_MODEL_DS18B20:
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return LOG_STR("DS18B20");
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case DALLAS_MODEL_DS1825:
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return LOG_STR("DS1825");
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case DALLAS_MODEL_DS28EA00:
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return LOG_STR("DS28EA00");
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default:
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return LOG_STR("Unknown");
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}
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}
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void OneWireBus::dump_devices_(const char *tag) {
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if (this->devices_.empty()) {
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ESP_LOGW(tag, " Found no devices!");
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} else {
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ESP_LOGCONFIG(tag, " Found devices:");
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for (auto &address : this->devices_) {
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ESP_LOGCONFIG(tag, " 0x%s (%s)", format_hex(address).c_str(), LOG_STR_ARG(get_model_str(address & 0xff)));
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}
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}
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}
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} // namespace one_wire
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} // namespace esphome
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