mirror of
https://github.com/esphome/esphome.git
synced 2024-12-02 19:54:14 +01:00
322 lines
11 KiB
C++
322 lines
11 KiB
C++
#ifdef USE_ESP_IDF
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#include "i2c_bus_esp_idf.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/log.h"
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#include <cstring>
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namespace esphome {
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namespace i2c {
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static const char *const TAG = "i2c.idf";
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void IDFI2CBus::setup() {
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static i2c_port_t next_port = 0;
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port_ = next_port++;
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recover_();
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i2c_config_t conf{};
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memset(&conf, 0, sizeof(conf));
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conf.mode = I2C_MODE_MASTER;
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conf.sda_io_num = sda_pin_;
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conf.sda_pullup_en = sda_pullup_enabled_;
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conf.scl_io_num = scl_pin_;
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conf.scl_pullup_en = scl_pullup_enabled_;
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conf.master.clk_speed = frequency_;
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esp_err_t err = i2c_param_config(port_, &conf);
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if (err != ESP_OK) {
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ESP_LOGW(TAG, "i2c_param_config failed: %s", esp_err_to_name(err));
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this->mark_failed();
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return;
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}
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err = i2c_driver_install(port_, I2C_MODE_MASTER, 0, 0, ESP_INTR_FLAG_IRAM);
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if (err != ESP_OK) {
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ESP_LOGW(TAG, "i2c_driver_install failed: %s", esp_err_to_name(err));
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this->mark_failed();
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return;
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}
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initialized_ = true;
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}
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void IDFI2CBus::dump_config() {
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ESP_LOGCONFIG(TAG, "I2C Bus:");
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ESP_LOGCONFIG(TAG, " SDA Pin: GPIO%u", this->sda_pin_);
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ESP_LOGCONFIG(TAG, " SCL Pin: GPIO%u", this->scl_pin_);
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ESP_LOGCONFIG(TAG, " Frequency: %u Hz", this->frequency_);
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switch (this->recovery_result_) {
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case RECOVERY_COMPLETED:
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ESP_LOGCONFIG(TAG, " Recovery: bus successfully recovered");
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break;
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case RECOVERY_FAILED_SCL_LOW:
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ESP_LOGCONFIG(TAG, " Recovery: failed, SCL is held low on the bus");
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break;
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case RECOVERY_FAILED_SDA_LOW:
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ESP_LOGCONFIG(TAG, " Recovery: failed, SDA is held low on the bus");
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break;
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}
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if (this->scan_) {
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ESP_LOGI(TAG, "Scanning i2c bus for active devices...");
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uint8_t found = 0;
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for (uint8_t address = 8; address < 120; address++) {
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auto err = writev(address, nullptr, 0);
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if (err == ERROR_OK) {
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ESP_LOGI(TAG, "Found i2c device at address 0x%02X", address);
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found++;
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} else if (err == ERROR_UNKNOWN) {
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ESP_LOGI(TAG, "Unknown error at address 0x%02X", address);
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}
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}
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if (found == 0) {
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ESP_LOGI(TAG, "Found no i2c devices!");
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}
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}
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}
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ErrorCode IDFI2CBus::readv(uint8_t address, ReadBuffer *buffers, size_t cnt) {
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// logging is only enabled with vv level, if warnings are shown the caller
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// should log them
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if (!initialized_) {
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ESP_LOGVV(TAG, "i2c bus not initialized!");
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return ERROR_NOT_INITIALIZED;
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}
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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esp_err_t err = i2c_master_start(cmd);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "RX from %02X master start failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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err = i2c_master_write_byte(cmd, (address << 1) | I2C_MASTER_READ, true);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "RX from %02X address write failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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for (size_t i = 0; i < cnt; i++) {
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const auto &buf = buffers[i];
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if (buf.len == 0)
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continue;
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err = i2c_master_read(cmd, buf.data, buf.len, i == cnt - 1 ? I2C_MASTER_LAST_NACK : I2C_MASTER_ACK);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "RX from %02X data read failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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}
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err = i2c_master_stop(cmd);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "RX from %02X stop failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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err = i2c_master_cmd_begin(port_, cmd, 20 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(cmd);
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if (err == ESP_FAIL) {
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// transfer not acked
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ESP_LOGVV(TAG, "RX from %02X failed: not acked", address);
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return ERROR_NOT_ACKNOWLEDGED;
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} else if (err == ESP_ERR_TIMEOUT) {
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ESP_LOGVV(TAG, "RX from %02X failed: timeout", address);
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return ERROR_TIMEOUT;
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} else if (err != ESP_OK) {
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ESP_LOGVV(TAG, "RX from %02X failed: %s", address, esp_err_to_name(err));
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return ERROR_UNKNOWN;
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}
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#ifdef ESPHOME_LOG_HAS_VERY_VERBOSE
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char debug_buf[4];
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std::string debug_hex;
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for (size_t i = 0; i < cnt; i++) {
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const auto &buf = buffers[i];
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for (size_t j = 0; j < buf.len; j++) {
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snprintf(debug_buf, sizeof(debug_buf), "%02X", buf.data[j]);
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debug_hex += debug_buf;
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}
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}
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ESP_LOGVV(TAG, "0x%02X RX %s", address, debug_hex.c_str());
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#endif
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return ERROR_OK;
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}
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ErrorCode IDFI2CBus::writev(uint8_t address, WriteBuffer *buffers, size_t cnt) {
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// logging is only enabled with vv level, if warnings are shown the caller
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// should log them
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if (!initialized_) {
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ESP_LOGVV(TAG, "i2c bus not initialized!");
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return ERROR_NOT_INITIALIZED;
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}
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#ifdef ESPHOME_LOG_HAS_VERY_VERBOSE
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char debug_buf[4];
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std::string debug_hex;
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for (size_t i = 0; i < cnt; i++) {
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const auto &buf = buffers[i];
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for (size_t j = 0; j < buf.len; j++) {
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snprintf(debug_buf, sizeof(debug_buf), "%02X", buf.data[j]);
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debug_hex += debug_buf;
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}
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}
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ESP_LOGVV(TAG, "0x%02X TX %s", address, debug_hex.c_str());
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#endif
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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esp_err_t err = i2c_master_start(cmd);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "TX to %02X master start failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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err = i2c_master_write_byte(cmd, (address << 1) | I2C_MASTER_WRITE, true);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "TX to %02X address write failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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for (size_t i = 0; i < cnt; i++) {
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const auto &buf = buffers[i];
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if (buf.len == 0)
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continue;
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err = i2c_master_write(cmd, buf.data, buf.len, true);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "TX to %02X data write failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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}
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err = i2c_master_stop(cmd);
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if (err != ESP_OK) {
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ESP_LOGVV(TAG, "TX to %02X master stop failed: %s", address, esp_err_to_name(err));
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i2c_cmd_link_delete(cmd);
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return ERROR_UNKNOWN;
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}
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err = i2c_master_cmd_begin(port_, cmd, 20 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(cmd);
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if (err == ESP_FAIL) {
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// transfer not acked
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ESP_LOGVV(TAG, "TX to %02X failed: not acked", address);
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return ERROR_NOT_ACKNOWLEDGED;
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} else if (err == ESP_ERR_TIMEOUT) {
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ESP_LOGVV(TAG, "TX to %02X failed: timeout", address);
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return ERROR_TIMEOUT;
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} else if (err != ESP_OK) {
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ESP_LOGVV(TAG, "TX to %02X failed: %s", address, esp_err_to_name(err));
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return ERROR_UNKNOWN;
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}
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return ERROR_OK;
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}
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/// Perform I2C bus recovery, see:
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/// https://www.nxp.com/docs/en/user-guide/UM10204.pdf
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/// https://www.analog.com/media/en/technical-documentation/application-notes/54305147357414AN686_0.pdf
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void IDFI2CBus::recover_() {
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ESP_LOGI(TAG, "Performing I2C bus recovery");
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const gpio_num_t scl_pin = static_cast<gpio_num_t>(scl_pin_);
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const gpio_num_t sda_pin = static_cast<gpio_num_t>(sda_pin_);
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// For the upcoming operations, target for a 60kHz toggle frequency.
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// 1000kHz is the maximum frequency for I2C running in standard-mode,
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// but lower frequencies are not a problem.
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// Note: the timing that is used here is chosen manually, to get
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// results that are close to the timing that can be archieved by the
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// implementation for the Arduino framework.
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const auto half_period_usec = 7;
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// Configure SCL pin for open drain input/output, with a pull up resistor.
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gpio_set_level(scl_pin, 1);
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gpio_config_t scl_config{};
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scl_config.pin_bit_mask = 1ULL << scl_pin_;
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scl_config.mode = GPIO_MODE_INPUT_OUTPUT_OD;
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scl_config.pull_up_en = GPIO_PULLUP_ENABLE;
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scl_config.pull_down_en = GPIO_PULLDOWN_DISABLE;
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scl_config.intr_type = GPIO_INTR_DISABLE;
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gpio_config(&scl_config);
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// Configure SDA pin for open drain input/output, with a pull up resistor.
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gpio_set_level(sda_pin, 1);
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gpio_config_t sda_conf{};
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sda_conf.pin_bit_mask = 1ULL << sda_pin_;
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sda_conf.mode = GPIO_MODE_INPUT_OUTPUT_OD;
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sda_conf.pull_up_en = GPIO_PULLUP_ENABLE;
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sda_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
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sda_conf.intr_type = GPIO_INTR_DISABLE;
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gpio_config(&sda_conf);
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// If SCL is pulled low on the I2C bus, then some device is interfering
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// with the SCL line. In that case, the I2C bus cannot be recovered.
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delayMicroseconds(half_period_usec);
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if (gpio_get_level(scl_pin) == 0) {
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ESP_LOGE(TAG, "Recovery failed: SCL is held LOW on the I2C bus");
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recovery_result_ = RECOVERY_FAILED_SCL_LOW;
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return;
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}
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// From the specification:
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// "If the data line (SDA) is stuck LOW, send nine clock pulses. The
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// device that held the bus LOW should release it sometime within
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// those nine clocks."
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// We don't really have to detect if SDA is stuck low. We'll simply send
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// nine clock pulses here, just in case SDA is stuck. Actual checks on
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// the SDA line status will be done after the clock pulses.
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for (auto i = 0; i < 9; i++) {
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gpio_set_level(scl_pin, 0);
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delayMicroseconds(half_period_usec);
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gpio_set_level(scl_pin, 1);
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delayMicroseconds(half_period_usec);
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// When SCL is kept LOW at this point, we might be looking at a device
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// that applies clock stretching. Wait for the release of the SCL line,
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// but not forever. There is no specification for the maximum allowed
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// time. We'll stick to 500ms here.
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auto wait = 20;
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while (wait-- && gpio_get_level(scl_pin) == 0) {
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delay(25);
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}
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if (gpio_get_level(scl_pin) == 0) {
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ESP_LOGE(TAG, "Recovery failed: SCL is held LOW during clock pulse cycle");
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recovery_result_ = RECOVERY_FAILED_SCL_LOW;
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return;
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}
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}
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// By now, any stuck device ought to have sent all remaining bits of its
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// transation, meaning that it should have freed up the SDA line, resulting
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// in SDA being pulled up.
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if (gpio_get_level(sda_pin) == 0) {
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ESP_LOGE(TAG, "Recovery failed: SDA is held LOW after clock pulse cycle");
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recovery_result_ = RECOVERY_FAILED_SDA_LOW;
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return;
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}
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// From the specification:
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// "I2C-bus compatible devices must reset their bus logic on receipt of
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// a START or repeated START condition such that they all anticipate
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// the sending of a target address, even if these START conditions are
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// not positioned according to the proper format."
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// While the 9 clock pulses from above might have drained all bits of a
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// single byte within a transaction, a device might have more bytes to
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// transmit. So here we'll generate a START condition to snap the device
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// out of this state.
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// SCL and SDA are already high at this point, so we can generate a START
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// condition by making the SDA signal LOW.
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delayMicroseconds(half_period_usec);
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gpio_set_level(sda_pin, 0);
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// From the specification:
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// "A START condition immediately followed by a STOP condition (void
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// message) is an illegal format. Many devices however are designed to
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// operate properly under this condition."
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// Finally, we'll bring the I2C bus into a starting state by generating
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// a STOP condition.
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delayMicroseconds(half_period_usec);
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gpio_set_level(sda_pin, 1);
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recovery_result_ = RECOVERY_COMPLETED;
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}
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} // namespace i2c
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} // namespace esphome
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#endif // USE_ESP_IDF
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