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https://github.com/esphome/esphome.git
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303 lines
11 KiB
C++
303 lines
11 KiB
C++
#ifdef USE_ESP_IDF
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#include "i2c_bus_esp_idf.h"
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#include <driver/gpio.h>
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#include <cinttypes>
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#include <cstring>
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#include "esphome/core/application.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/helpers.h"
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#include "esphome/core/log.h"
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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 = I2C_NUM_0;
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this->port_ = next_port;
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if (this->port_ == I2C_NUM_MAX) {
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ESP_LOGE(TAG, "No more than %u buses supported", I2C_NUM_MAX);
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this->mark_failed();
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return;
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}
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if (this->timeout_ > 13000) {
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ESP_LOGW(TAG, "Using max allowed timeout: 13 ms");
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this->timeout_ = 13000;
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}
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this->recover_();
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next_port = (i2c_port_t) (next_port + 1);
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i2c_master_bus_config_t bus_conf{};
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memset(&bus_conf, 0, sizeof(bus_conf));
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bus_conf.sda_io_num = gpio_num_t(sda_pin_);
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bus_conf.scl_io_num = gpio_num_t(scl_pin_);
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bus_conf.i2c_port = this->port_;
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bus_conf.glitch_ignore_cnt = 7;
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#if SOC_LP_I2C_SUPPORTED
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if (this->port_ < SOC_HP_I2C_NUM) {
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bus_conf.clk_source = I2C_CLK_SRC_DEFAULT;
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} else {
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bus_conf.lp_source_clk = LP_I2C_SCLK_DEFAULT;
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}
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#else
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bus_conf.clk_source = I2C_CLK_SRC_DEFAULT;
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#endif
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bus_conf.flags.enable_internal_pullup = sda_pullup_enabled_ || scl_pullup_enabled_;
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esp_err_t err = i2c_new_master_bus(&bus_conf, &this->bus_);
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if (err != ESP_OK) {
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ESP_LOGW(TAG, "i2c_new_master_bus 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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i2c_device_config_t dev_conf{};
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memset(&dev_conf, 0, sizeof(dev_conf));
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dev_conf.dev_addr_length = I2C_ADDR_BIT_LEN_7;
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dev_conf.device_address = I2C_DEVICE_ADDRESS_NOT_USED;
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dev_conf.scl_speed_hz = this->frequency_;
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dev_conf.scl_wait_us = this->timeout_;
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err = i2c_master_bus_add_device(this->bus_, &dev_conf, &this->dev_);
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if (err != ESP_OK) {
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ESP_LOGW(TAG, "i2c_master_bus_add_device 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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this->initialized_ = true;
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if (this->scan_) {
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ESP_LOGV(TAG, "Scanning for devices");
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this->i2c_scan_();
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}
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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,
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" SDA Pin: GPIO%u\n"
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" SCL Pin: GPIO%u\n"
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" Frequency: %" PRIu32 " Hz",
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this->sda_pin_, this->scl_pin_, this->frequency_);
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if (timeout_ > 0) {
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ESP_LOGCONFIG(TAG, " Timeout: %" PRIu32 "us", this->timeout_);
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}
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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_LOGCONFIG(TAG, "Results from bus scan:");
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if (scan_results_.empty()) {
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ESP_LOGCONFIG(TAG, "Found no devices");
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} else {
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for (const auto &s : scan_results_) {
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if (s.second) {
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ESP_LOGCONFIG(TAG, "Found device at address 0x%02X", s.first);
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} else {
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ESP_LOGE(TAG, "Unknown error at address 0x%02X", s.first);
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}
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}
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}
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}
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}
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ErrorCode IDFI2CBus::write_readv(uint8_t address, const uint8_t *write_buffer, size_t write_count, uint8_t *read_buffer,
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size_t read_count) {
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// logging is only enabled with v 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_LOGW(TAG, "i2c bus not initialized!");
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return ERROR_NOT_INITIALIZED;
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}
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i2c_operation_job_t jobs[8]{};
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size_t num_jobs = 0;
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uint8_t write_addr = (address << 1) | I2C_MASTER_WRITE;
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uint8_t read_addr = (address << 1) | I2C_MASTER_READ;
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ESP_LOGV(TAG, "Writing %zu bytes, reading %zu bytes", write_count, read_count);
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if (read_count == 0 && write_count == 0) {
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// basically just a bus probe. Send a start, address and stop
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ESP_LOGV(TAG, "0x%02X BUS PROBE", address);
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jobs[num_jobs++].command = I2C_MASTER_CMD_START;
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jobs[num_jobs].command = I2C_MASTER_CMD_WRITE;
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jobs[num_jobs].write.ack_check = true;
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jobs[num_jobs].write.data = &write_addr;
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jobs[num_jobs++].write.total_bytes = 1;
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} else {
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if (write_count != 0) {
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ESP_LOGV(TAG, "0x%02X TX %s", address, format_hex_pretty(write_buffer, write_count).c_str());
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jobs[num_jobs++].command = I2C_MASTER_CMD_START;
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jobs[num_jobs].command = I2C_MASTER_CMD_WRITE;
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jobs[num_jobs].write.ack_check = true;
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jobs[num_jobs].write.data = &write_addr;
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jobs[num_jobs++].write.total_bytes = 1;
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jobs[num_jobs].command = I2C_MASTER_CMD_WRITE;
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jobs[num_jobs].write.ack_check = true;
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jobs[num_jobs].write.data = (uint8_t *) write_buffer;
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jobs[num_jobs++].write.total_bytes = write_count;
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}
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if (read_count != 0) {
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ESP_LOGV(TAG, "0x%02X RX bytes %zu", address, read_count);
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jobs[num_jobs++].command = I2C_MASTER_CMD_START;
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jobs[num_jobs].command = I2C_MASTER_CMD_WRITE;
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jobs[num_jobs].write.ack_check = true;
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jobs[num_jobs].write.data = &read_addr;
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jobs[num_jobs++].write.total_bytes = 1;
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if (read_count > 1) {
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jobs[num_jobs].command = I2C_MASTER_CMD_READ;
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jobs[num_jobs].read.ack_value = I2C_ACK_VAL;
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jobs[num_jobs].read.data = read_buffer;
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jobs[num_jobs++].read.total_bytes = read_count - 1;
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}
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jobs[num_jobs].command = I2C_MASTER_CMD_READ;
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jobs[num_jobs].read.ack_value = I2C_NACK_VAL;
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jobs[num_jobs].read.data = read_buffer + read_count - 1;
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jobs[num_jobs++].read.total_bytes = 1;
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}
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}
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jobs[num_jobs++].command = I2C_MASTER_CMD_STOP;
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ESP_LOGV(TAG, "Sending %zu jobs", num_jobs);
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esp_err_t err = i2c_master_execute_defined_operations(this->dev_, jobs, num_jobs, 20);
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if (err == ESP_ERR_INVALID_STATE) {
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ESP_LOGV(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_LOGV(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_LOGV(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 bus recovery");
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const auto scl_pin = static_cast<gpio_num_t>(scl_pin_);
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const auto 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 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 yield and reset the WDT, so as to avoid triggering reset.
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// No point in trying to recover the bus by forcing a uC reset. Bus
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// should recover in a few ms or less else not likely to recovery at
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// all.
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auto wait = 250;
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while (wait-- && gpio_get_level(scl_pin) == 0) {
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App.feed_wdt();
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delayMicroseconds(half_period_usec * 2);
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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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// transaction, 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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